Merge remote-tracking branch 'space/dev' into dev

.space.kts

@@ -1,14 +1,14 @@
 import kotlin.io.path.readText
 
 job("Build") {
-    gradlew("openjdk:11", "build")
+    gradlew("spc.registry.jetbrains.space/p/sci/containers/kotlin-ci:1.0.3", "build")
 }
 
 job("Publish") {
     startOn {
         gitPush { enabled = false }
     }
-    container("openjdk:11") {
+    container("spc.registry.jetbrains.space/p/sci/containers/kotlin-ci:1.0.3") {
         env["SPACE_USER"] = Secrets("space_user")
         env["SPACE_TOKEN"] = Secrets("space_token")
         kotlinScript { api ->

CHANGELOG.md

@@ -0,0 +1,15 @@
+# Changelog
+
+## Unreleased
+
+### Added
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security

README.md

@@ -1,13 +1,73 @@
+# Maps-kt
+
 This repository is a work-in-progress implementation of Map-with-markers component for Compose-Multiplatform
 
-## [maps-kt-core](maps-kt-core)
+![](docs/images/Screenshot%202023-01-12%20110429.png)
-A multiplatform coordinates representation and conversion.
 
-## [maps-kt-compose](maps-kt-compose)
+## Modules
-A compose multiplatform (currently desktop only, contributions of android target are welcome) implementation of a map component, features and builder.
 
-## [maps-kt-scheme](maps-kt-scheme)
-An alternative component used for the same functionality on 2D schemes. Not all features from maps could be ported because it requires some code duplication (ideas for common API are welcome).
 
-## [demo](demo)
+### [demo](demo)
-Demonstration projects for different features
+> 
+>
+> **Maturity**: EXPERIMENTAL
+
+### [maps-kt-compose](maps-kt-compose)
+> Compose-multiplaform implementation for web-mercator tiled maps
+>
+> **Maturity**: EXPERIMENTAL
+>
+> **Features:**
+> - [osm](maps-kt-compose/#) : OpenStreetMap tile provider.
+
+
+### [maps-kt-core](maps-kt-core)
+> Core cartography, UI-agnostic
+>
+> **Maturity**: DEVELOPMENT
+>
+> **Features:**
+> - [angles and distances](maps-kt-core/#) : Type-safe angle and distance measurements.
+> - [ellipsoid](maps-kt-core/#) : Ellipsoid geometry and distances
+> - [mercator](maps-kt-core/#) : Mercator and web-mercator projections
+
+
+### [maps-kt-features](maps-kt-features)
+> 
+>
+> **Maturity**: EXPERIMENTAL
+
+### [maps-kt-geojson](maps-kt-geojson)
+> 
+>
+> **Maturity**: EXPERIMENTAL
+
+### [maps-kt-scheme](maps-kt-scheme)
+> 
+>
+> **Maturity**: EXPERIMENTAL
+
+### [trajectory-kt](trajectory-kt)
+> Path and trajectory optimization
+>
+> **Maturity**: EXPERIMENTAL
+
+### [demo/maps](demo/maps)
+> 
+>
+> **Maturity**: EXPERIMENTAL
+
+### [demo/polygon-editor](demo/polygon-editor)
+> 
+>
+> **Maturity**: EXPERIMENTAL
+
+### [demo/scheme](demo/scheme)
+> 
+>
+> **Maturity**: EXPERIMENTAL
+
+### [demo/trajectory-playground](demo/trajectory-playground)
+> 
+>
+> **Maturity**: EXPERIMENTAL

build.gradle.kts

@@ -1,90 +1,51 @@
+import space.kscience.gradle.isInDevelopment
+import space.kscience.gradle.useApache2Licence
+import space.kscience.gradle.useSPCTeam
+
 plugins {
-    base
+    id("space.kscience.gradle.project")
 }
 
-val ktorVersion by extra("2.0.3")
+val kmathVersion: String by extra("0.3.1-dev-RC")
 
 allprojects {
     group = "center.sciprog"
-    version = "0.1.0-SNAPSHOT"
+    version = "0.2.2"
+
+    repositories {
+        mavenLocal()
+        maven("https://repo.kotlin.link")
+        maven("https://maven.pkg.jetbrains.space/spc/p/sci/dev")
+    }
 }
 
-tasks.create("version") {
+ksciencePublish {
-    group = "publishing"
+    pom("https://github.com/SciProgCentre/maps-kt") {
-    val versionFile = project.buildDir.resolve("project-version.txt")
+        useApache2Licence()
-    outputs.file(versionFile)
+        useSPCTeam()
-    doLast {
-        versionFile.createNewFile()
-        versionFile.writeText(project.version.toString())
-        println(project.version)
     }
+    github("SciProgCentre", "maps-kt")
+    space(
+        if (isInDevelopment) {
+            "https://maven.pkg.jetbrains.space/spc/p/sci/dev"
+        } else {
+            "https://maven.pkg.jetbrains.space/spc/p/sci/maven"
+        }
+    )
+    sonatype()
 }
 
 subprojects {
     repositories {
+        maven("https://maven.pkg.jetbrains.space/mipt-npm/p/sci/dev")
         google()
         mavenCentral()
+        maven("https://repo.kotlin.link")
         maven("https://maven.pkg.jetbrains.space/public/p/compose/dev")
     }
-
-    plugins.withId("maven-publish") {
-
-        configure<PublishingExtension> {
-            val vcs = "https://github.com/mipt-npm/maps-kt"
-
-            // Process each publication we have in this project
-            publications {
-                withType<MavenPublication> {
-                    pom {
-                        name.set(project.name)
-                        description.set(project.description)
-                        url.set(vcs)
-
-                        licenses {
-                            license {
-                                name.set("The Apache Software License, Version 2.0")
-                                url.set("https://www.apache.org/licenses/LICENSE-2.0.txt")
-                                distribution.set("repo")
-                            }
-                        }
-
-                        developers {
-                            developer {
-                                id.set("SPC")
-                                name.set("Scientific programming centre")
-                                organization.set("MIPT")
-                                organizationUrl.set("https://sciprog.center/")
-                            }
-                        }
-
-                        scm {
-                            url.set(vcs)
-                            tag.set(project.version.toString())
-                        }
-                    }
-                }
-            }
-
-            val spaceRepo = "https://maven.pkg.jetbrains.space/mipt-npm/p/sci/maven"
-            val spaceUser: String? = project.findProperty("publishing.space.user") as? String
-            val spaceToken: String? = project.findProperty("publishing.space.token") as? String
-
-            if (spaceUser != null && spaceToken != null) {
-                project.logger.info("Adding mipt-npm Space publishing to project [${project.name}]")
-
-                repositories.maven {
-                    name = "space"
-                    url = uri(spaceRepo)
-
-                    credentials {
-                        username = spaceUser
-                        password = spaceToken
-                    }
-                }
-            }
-        }
-    }
 }
 
+readme.readmeTemplate = file("docs/templates/README-TEMPLATE.md")
+
 
 

demo/README.md

@@ -0,0 +1,4 @@
+# Module demo
+
+
+

demo/maps/README.md

@@ -0,0 +1,4 @@
+# Module maps
+
+
+

demo/maps/api/maps.api

@@ -0,0 +1,18 @@
+public final class ComposableSingletons$MainKt {
+	public static final field INSTANCE LComposableSingletons$MainKt;
+	public static field lambda-1 Lkotlin/jvm/functions/Function2;
+	public static field lambda-2 Lkotlin/jvm/functions/Function3;
+	public static field lambda-3 Lkotlin/jvm/functions/Function3;
+	public fun <init> ()V
+	public final fun getLambda-1$maps ()Lkotlin/jvm/functions/Function2;
+	public final fun getLambda-2$maps ()Lkotlin/jvm/functions/Function3;
+	public final fun getLambda-3$maps ()Lkotlin/jvm/functions/Function3;
+}
+
+public final class MainKt {
+	public static final fun App (Landroidx/compose/runtime/Composer;I)V
+	public static final fun main ()V
+	public static synthetic fun main ([Ljava/lang/String;)V
+	public static final fun toShortString (Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;)Ljava/lang/String;
+}
+

demo/maps/build.gradle.kts

@@ -1,4 +1,3 @@
-import org.jetbrains.compose.compose
 import org.jetbrains.compose.desktop.application.dsl.TargetFormat
 
 plugins {
@@ -9,18 +8,15 @@ plugins {
 val ktorVersion: String by rootProject.extra
 
 kotlin {
-    jvm {
+    jvmToolchain(11)
-        compilations.all {
+    jvm()
-            kotlinOptions.jvmTarget = "11"
-        }
-        withJava()
-    }
     sourceSets {
         val jvmMain by getting {
             dependencies {
                 implementation(projects.mapsKtCompose)
+                implementation(projects.mapsKtGeojson)
                 implementation(compose.desktop.currentOs)
-                implementation("io.ktor:ktor-client-cio:$ktorVersion")
+                implementation("io.ktor:ktor-client-cio")
                 implementation("ch.qos.logback:logback-classic:1.2.11")
             }
         }
@@ -28,7 +24,8 @@ kotlin {
     }
 }
 
-compose.desktop {
+compose {
+    desktop {
         application {
             mainClass = "MainKt"
             nativeDistributions {
@@ -37,4 +34,5 @@ compose.desktop {
                 packageVersion = "1.0.0"
             }
         }
+    }
 }

demo/maps/src/jvmMain/kotlin/Main.kt

@@ -1,46 +1,51 @@
-// Copyright 2000-2021 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 import androidx.compose.desktop.ui.tooling.preview.Preview
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.PointerMatcher
 import androidx.compose.material.MaterialTheme
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Home
-import androidx.compose.runtime.*
+import androidx.compose.runtime.Composable
-import androidx.compose.ui.geometry.Offset
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.graphics.PointMode
+import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.unit.DpSize
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.window.Window
 import androidx.compose.ui.window.application
+import center.sciprog.attributes.Attributes
 import center.sciprog.maps.compose.*
-import center.sciprog.maps.coordinates.Distance
+import center.sciprog.maps.coordinates.*
-import center.sciprog.maps.coordinates.GeodeticMapCoordinates
+import center.sciprog.maps.features.*
-import center.sciprog.maps.coordinates.MapViewPoint
+import center.sciprog.maps.geojson.geoJson
 import io.ktor.client.HttpClient
 import io.ktor.client.engine.cio.CIO
 import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.filterNotNull
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
+import space.kscience.kmath.geometry.Angle
+import space.kscience.kmath.geometry.degrees
+import space.kscience.kmath.geometry.radians
 import java.nio.file.Path
 import kotlin.math.PI
 import kotlin.random.Random
 
-private fun GeodeticMapCoordinates.toShortString(): String =
+public fun GeodeticMapCoordinates.toShortString(): String =
-    "${(latitude.degrees.value).toString().take(6)}:${(longitude.degrees.value).toString().take(6)}"
+    "${(latitude.degrees).toString().take(6)}:${(longitude.degrees).toString().take(6)}"
 
 
+@OptIn(ExperimentalFoundationApi::class)
 @Composable
 @Preview
 fun App() {
     MaterialTheme {
-        //create a view point
-        val viewPoint = remember {
-            MapViewPoint(
-                GeodeticMapCoordinates.ofDegrees(55.7558, 37.6173),
-                8.0
-            )
-        }
 
         val scope = rememberCoroutineScope()
+
         val mapTileProvider = remember {
             OpenStreetMapTileProvider(
                 client = HttpClient(CIO),
@@ -48,29 +53,44 @@ fun App() {
             )
         }
 
-        var centerCoordinates by remember { mutableStateOf<GeodeticMapCoordinates?>(null) }
+        val centerCoordinates = MutableStateFlow<Gmc?>(null)
 
 
         val pointOne = 55.568548 to 37.568604
         val pointTwo = 55.929444 to 37.518434
-        val pointThree = 60.929444 to 37.518434
+//        val pointThree = 60.929444 to 37.518434
-
-        val dragPoint = 55.744 to 37.614
 
         MapView(
             mapTileProvider = mapTileProvider,
-            initialViewPoint = viewPoint,
+            config = ViewConfig(
-            config = MapViewConfig(
+                onViewChange = { centerCoordinates.value = focus },
-                inferViewBoxFromFeatures = true,
+                onClick = { _, viewPoint ->
-                onViewChange = { centerCoordinates = focus },
+                    println(viewPoint)
+                }
             )
         ) {
 
-            image(pointOne, Icons.Filled.Home)
+            geoJson(javaClass.getResource("/moscow.geo.json")!!)
+                .modifyAttribute(ColorAttribute, Color.Blue)
+                .modifyAttribute(AlphaAttribute, 0.4f)
 
-            rectangle(dragPoint, id = "dragMe", size = DpSize(10.dp, 10.dp)).draggable()
+            icon(pointOne, Icons.Filled.Home)
 
-            points(
+            val marker1 = rectangle(55.744 to 38.614, size = DpSize(10.dp, 10.dp)).color(Color.Magenta)
+            val marker2 = rectangle(55.8 to 38.5, size = DpSize(10.dp, 10.dp)).color(Color.Magenta)
+            val marker3 = rectangle(56.0 to 38.5, size = DpSize(10.dp, 10.dp)).color(Color.Magenta)
+
+            draggableLine(marker1, marker2, id = "line 1").color(Color.Red).onClick {
+                println("line 1 clicked")
+            }
+            draggableLine(marker2, marker3, id = "line 2").color(Color.DarkGray).onClick {
+                println("line 2 clicked")
+            }
+            draggableLine(marker3, marker1, id = "line 3").color(Color.Blue).onClick {
+                println("line 3 clicked")
+            }
+
+            multiLine(
                 points = listOf(
                     55.742465 to 37.615812,
                     55.742713 to 37.616370,
@@ -79,48 +99,73 @@ fun App() {
                     55.742086 to 37.616566,
                     55.741715 to 37.616716
                 ),
-                pointMode = PointMode.Polygon
             )
 
             //remember feature ID
-            val circleId: FeatureId = circle(
+            val circleId = circle(
                 centerCoordinates = pointTwo,
             )
-
+            scope.launch {
-            draw(position = pointThree) {
+                while (isActive) {
-                drawLine(start = Offset(-10f, -10f), end = Offset(10f, 10f), color = Color.Red)
+                    delay(200)
-                drawLine(start = Offset(-10f, 10f), end = Offset(10f, -10f), color = Color.Red)
+                    circleId.color(Color(Random.nextFloat(), Random.nextFloat(), Random.nextFloat()))
+                }
             }
 
-            arc(pointOne, Distance(10.0), 0f, PI)
+
+//            draw(position = pointThree) {
+//                drawLine(start = Offset(-10f, -10f), end = Offset(10f, 10f), color = Color.Red)
+//                drawLine(start = Offset(-10f, 10f), end = Offset(10f, -10f), color = Color.Red)
+//            }
+
+            arc(pointOne, 10.0.kilometers, (PI / 4).radians, -Angle.pi / 2)
 
             line(pointOne, pointTwo, id = "line")
             text(pointOne, "Home", font = { size = 32f })
 
-            centerCoordinates?.let {
+            pixelMap(
-                group(id = "center") {
+                space.Rectangle(
-                    circle(center = it, color = Color.Blue, size = 1f)
+                    Gmc(latitude = 55.58461879539754.degrees, longitude = 37.8746197303493.degrees),
-                    text(position = it, it.toShortString(), color = Color.Blue)
+                    Gmc(latitude = 55.442792937592415.degrees, longitude = 38.132240805463844.degrees)
-                }
+                ),
+                0.005.degrees,
+                0.005.degrees
+            ) { gmc ->
+                Color(
+                    red = ((gmc.latitude + Angle.piDiv2).degrees*10 % 1f).toFloat(),
+                    green = ((gmc.longitude + Angle.pi).degrees*10 % 1f).toFloat(),
+                    blue = 0f
+                ).copy(alpha = 0.3f)
             }
 
-            scope.launch {
+            centerCoordinates.filterNotNull().onEach {
-                while (isActive) {
+                group(id = "center") {
-                    delay(200)
+                    circle(center = it, id = "circle", size = 1.dp).color(Color.Blue)
-                    //Overwrite a feature with new color
+                    text(position = it, it.toShortString(), id = "text").color(Color.Blue)
-                    circle(
+                }
-                        pointTwo,
+            }.launchIn(scope)
-                        id = circleId,
+
-                        color = Color(Random.nextFloat(), Random.nextFloat(), Random.nextFloat())
+            //Add click listeners for all polygons
-                    )
+            forEachWithType<Gmc, PolygonFeature<Gmc>> { ref ->
+                ref.onClick(PointerMatcher.Primary) {
+                    println("Click on ${ref.id}")
+                    //draw in top-level scope
+                    with(this@MapView) {
+                        multiLine(
+                            ref.resolve().points,
+                            attributes = Attributes(ZAttribute, 10f),
+                            id = "selected",
+                        ).modifyAttribute(StrokeAttribute, 4f).color(Color.Magenta)
+                    }
                 }
             }
         }
     }
 }
 
+
 fun main() = application {
-    Window(onCloseRequest = ::exitApplication) {
+    Window(onCloseRequest = ::exitApplication, title = "Maps-kt demo", icon = painterResource("SPC-logo.png")) {
         App()
     }
 }

demo/polygon-editor/README.md

@@ -0,0 +1,4 @@
+# Module polygon-editor
+
+
+

demo/polygon-editor/api/polygon-editor.api

@@ -0,0 +1,19 @@
+public final class ComposableSingletons$MainKt {
+	public static final field INSTANCE LComposableSingletons$MainKt;
+	public static field lambda-1 Lkotlin/jvm/functions/Function3;
+	public static field lambda-2 Lkotlin/jvm/functions/Function2;
+	public static field lambda-3 Lkotlin/jvm/functions/Function3;
+	public static field lambda-4 Lkotlin/jvm/functions/Function3;
+	public fun <init> ()V
+	public final fun getLambda-1$polygon_editor ()Lkotlin/jvm/functions/Function3;
+	public final fun getLambda-2$polygon_editor ()Lkotlin/jvm/functions/Function2;
+	public final fun getLambda-3$polygon_editor ()Lkotlin/jvm/functions/Function3;
+	public final fun getLambda-4$polygon_editor ()Lkotlin/jvm/functions/Function3;
+}
+
+public final class MainKt {
+	public static final fun App (Landroidx/compose/runtime/Composer;I)V
+	public static final fun main ()V
+	public static synthetic fun main ([Ljava/lang/String;)V
+}
+

demo/polygon-editor/build.gradle.kts

@@ -0,0 +1,36 @@
+import org.jetbrains.compose.desktop.application.dsl.TargetFormat
+
+plugins {
+    kotlin("multiplatform")
+    id("org.jetbrains.compose")
+}
+
+val ktorVersion: String by rootProject.extra
+
+kotlin {
+    jvm()
+    jvmToolchain(11)
+    sourceSets {
+        val jvmMain by getting {
+            dependencies {
+                implementation(projects.mapsKtScheme)
+                implementation(compose.desktop.currentOs)
+                implementation("ch.qos.logback:logback-classic:1.2.11")
+            }
+        }
+        val jvmTest by getting
+    }
+}
+
+compose{
+    desktop {
+        application {
+            mainClass = "MainKt"
+            nativeDistributions {
+                targetFormats(TargetFormat.Dmg, TargetFormat.Msi, TargetFormat.Deb)
+                packageName = "polygon-editor-demo"
+                packageVersion = "1.0.0"
+            }
+        }
+    }
+}

demo/polygon-editor/src/jvmMain/kotlin/Main.kt

@@ -0,0 +1,80 @@
+// Copyright 2000-2021 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+import androidx.compose.desktop.ui.tooling.preview.Preview
+import androidx.compose.material.CursorDropdownMenu
+import androidx.compose.material.MaterialTheme
+import androidx.compose.material.Text
+import androidx.compose.material.TextButton
+import androidx.compose.runtime.*
+import androidx.compose.runtime.snapshots.SnapshotStateList
+import androidx.compose.ui.input.pointer.isSecondaryPressed
+import androidx.compose.ui.window.Window
+import androidx.compose.ui.window.application
+import center.sciprog.maps.features.*
+import center.sciprog.maps.scheme.SchemeView
+import center.sciprog.maps.scheme.XY
+import center.sciprog.maps.scheme.XYCoordinateSpace
+import center.sciprog.maps.scheme.XYViewScope
+
+@Composable
+@Preview
+fun App() {
+    MaterialTheme {
+
+        var clickPoint by remember { mutableStateOf<XY?>(null) }
+
+        val myPolygon: SnapshotStateList<XY> = remember { mutableStateListOf<XY>() }
+
+        val featureState: FeatureGroup<XY> = FeatureGroup.remember(XYCoordinateSpace) {
+            multiLine(
+                listOf(XY(0f, 0f), XY(0f, 1f), XY(1f, 1f), XY(1f, 0f), XY(0f, 0f)),
+                id = "frame"
+            )
+        }
+
+        val mapState: XYViewScope = XYViewScope.remember(
+            config = ViewConfig<XY>(
+                onClick = { event, point ->
+                    if (event.buttons.isSecondaryPressed) {
+                        clickPoint = point.focus
+                    }
+                }
+            ),
+            initialRectangle = featureState.getBoundingBox(1f),
+        )
+
+        CursorDropdownMenu(clickPoint != null, { clickPoint = null }) {
+            clickPoint?.let { point ->
+                TextButton({
+                    myPolygon.add(point)
+                    if (myPolygon.isNotEmpty()) {
+                        featureState.group(id = "polygon") {
+                            val pointRefs = myPolygon.mapIndexed { index, xy ->
+                                circle(xy, id = "point[$index]").draggable { _, to ->
+                                    myPolygon[index] = to.focus
+                                }
+                            }
+                            draggableMultiLine(
+                                pointRefs + pointRefs.first(),
+                            )
+                        }
+                    }
+                    clickPoint = null
+                }) {
+                    Text("Create node")
+                }
+            }
+        }
+
+        SchemeView(
+            mapState,
+            featureState,
+        )
+
+    }
+}
+
+fun main() = application {
+    Window(title = "Polygon editor demo", onCloseRequest = ::exitApplication) {
+        App()
+    }
+}

demo/scheme/README.md

@@ -0,0 +1,4 @@
+# Module scheme
+
+
+

demo/scheme/api/scheme.api

@@ -0,0 +1,17 @@
+public final class ComposableSingletons$MainKt {
+	public static final field INSTANCE LComposableSingletons$MainKt;
+	public static field lambda-1 Lkotlin/jvm/functions/Function2;
+	public static field lambda-2 Lkotlin/jvm/functions/Function3;
+	public static field lambda-3 Lkotlin/jvm/functions/Function3;
+	public fun <init> ()V
+	public final fun getLambda-1$scheme ()Lkotlin/jvm/functions/Function2;
+	public final fun getLambda-2$scheme ()Lkotlin/jvm/functions/Function3;
+	public final fun getLambda-3$scheme ()Lkotlin/jvm/functions/Function3;
+}
+
+public final class MainKt {
+	public static final fun App (Landroidx/compose/runtime/Composer;I)V
+	public static final fun main ()V
+	public static synthetic fun main ([Ljava/lang/String;)V
+}
+

demo/scheme/build.gradle.kts

@@ -1,4 +1,3 @@
-import org.jetbrains.compose.compose
 import org.jetbrains.compose.desktop.application.dsl.TargetFormat
 
 plugins {
@@ -9,12 +8,8 @@ plugins {
 val ktorVersion: String by rootProject.extra
 
 kotlin {
-    jvm {
+    jvm()
-        compilations.all {
+    jvmToolchain(11)
-            kotlinOptions.jvmTarget = "11"
-        }
-        withJava()
-    }
     sourceSets {
         val jvmMain by getting {
             dependencies {
@@ -27,7 +22,8 @@ kotlin {
     }
 }
 
-compose.desktop {
+compose{
+    desktop {
         application {
             mainClass = "MainKt"
             nativeDistributions {
@@ -36,4 +32,5 @@ compose.desktop {
                 packageVersion = "1.0.0"
             }
         }
+    }
 }

demo/scheme/src/jvmMain/kotlin/Main.kt

@@ -1,67 +1,104 @@
 // Copyright 2000-2021 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 import androidx.compose.desktop.ui.tooling.preview.Preview
+import androidx.compose.foundation.ContextMenuArea
+import androidx.compose.foundation.ContextMenuItem
 import androidx.compose.material.MaterialTheme
-import androidx.compose.runtime.Composable
+import androidx.compose.runtime.*
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.window.Window
 import androidx.compose.ui.window.application
+import center.sciprog.maps.features.FeatureGroup
+import center.sciprog.maps.features.ViewConfig
+import center.sciprog.maps.features.ViewPoint
+import center.sciprog.maps.features.color
 import center.sciprog.maps.scheme.*
+import center.sciprog.maps.svg.FeatureStateSnapshot
+import center.sciprog.maps.svg.exportToSvg
+import center.sciprog.maps.svg.snapshot
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.isActive
 import kotlinx.coroutines.launch
+import space.kscience.kmath.geometry.Angle
+import java.awt.Desktop
+import java.nio.file.Files
 
 @Composable
 @Preview
 fun App() {
     MaterialTheme {
-        //create a view point
-        val viewPoint = remember {
-            SchemeViewPoint(
-                SchemeCoordinates(0f, 0f),
-                1f
-            )
-        }
         val scope = rememberCoroutineScope()
 
+        val schemeFeaturesState: FeatureGroup<XY> = FeatureGroup.remember(XYCoordinateSpace) {
+            background(1600f, 1200f) { painterResource("middle-earth.jpg") }
+            circle(410.52737 to 868.7676).color(Color.Blue)
+            text(410.52737 to 868.7676, "Shire").color(Color.Blue)
+            circle(1132.0881 to 394.99127).color(Color.Red)
+            text(1132.0881 to 394.99127, "Ordruin").color(Color.Red)
+            arc(center = 1132.0881 to 394.99127, radius = 20f, startAngle = Angle.zero, Angle.piTimes2)
 
-        SchemeView(
+            //circle(410.52737 to 868.7676, id = "hobbit")
-            viewPoint,
-            config = SchemeViewConfig(
-                inferViewBoxFromFeatures = true,
-                onClick = {
-                    println("${focus.x}, ${focus.y}")
-                }
-            )
-        ) {
-            background(painterResource("middle-earth.jpg"))
-            circle(410.52737 to 868.7676, color = Color.Blue)
-            text(410.52737 to 868.7676, "Shire", color = Color.Blue)
-            circle(1132.0881 to 394.99127, color = Color.Red)
-            text(1132.0881 to 394.99127, "Ordruin", color = Color.Red)
-
-            val hobbitId = circle(410.52737 to 868.7676)
 
             scope.launch {
                 var t = 0.0
                 while (isActive) {
                     val x = 410.52737 + t * (1132.0881 - 410.52737)
                     val y = 868.7676 + t * (394.99127 - 868.7676)
-                    circle(x to y, color = Color.Green, id = hobbitId)
+                    circle(x to y, id = "hobbit").color(Color.Green)
                     delay(100)
                     t += 0.005
                     if (t >= 1.0) t = 0.0
                 }
             }
-
         }
+
+        val initialViewPoint: ViewPoint<XY> = remember {
+            schemeFeaturesState.getBoundingBox(1f)?.computeViewPoint() ?: XYViewPoint(XY(0f, 0f))
+        }
+
+        var viewPoint: ViewPoint<XY> by remember { mutableStateOf(initialViewPoint) }
+
+        var snapshot: FeatureStateSnapshot<XY>? by remember { mutableStateOf(null) }
+
+        if (snapshot == null) {
+            snapshot = schemeFeaturesState.snapshot()
+        }
+
+        ContextMenuArea(
+            items = {
+                listOf(
+                    ContextMenuItem("Export to SVG") {
+                        snapshot?.let {
+                            val path = Files.createTempFile("scheme-kt-", ".svg")
+                            it.exportToSvg(viewPoint, 800.0, 800.0, path)
+                            println(path.toFile())
+                            Desktop.getDesktop().browse(path.toFile().toURI())
+                        }
+                    },
+                )
+            }
+        ) {
+            val mapState: XYViewScope = XYViewScope.remember(
+                ViewConfig(
+                    onClick = { _, click ->
+                        println("${click.focus.x}, ${click.focus.y}")
+                    },
+                    onViewChange = { viewPoint = this }
+                ),
+                initialViewPoint = initialViewPoint,
+            )
+
+            SchemeView(
+                mapState,
+                schemeFeaturesState,
+            )
+        }
+
     }
 }
 
 fun main() = application {
-    Window(onCloseRequest = ::exitApplication) {
+    Window(title = "Scheme demo", onCloseRequest = ::exitApplication) {
         App()
     }
 }

demo/trajectory-playground/README.md

@@ -0,0 +1,4 @@
+# Module trajectory-playground
+
+
+

demo/trajectory-playground/api/trajectory-playground.api

@@ -0,0 +1,25 @@
+public final class ComposableSingletons$MainKt {
+	public static final field INSTANCE LComposableSingletons$MainKt;
+	public static field lambda-1 Lkotlin/jvm/functions/Function2;
+	public static field lambda-2 Lkotlin/jvm/functions/Function3;
+	public static field lambda-3 Lkotlin/jvm/functions/Function3;
+	public fun <init> ()V
+	public final fun getLambda-1$trajectory_playground ()Lkotlin/jvm/functions/Function2;
+	public final fun getLambda-2$trajectory_playground ()Lkotlin/jvm/functions/Function3;
+	public final fun getLambda-3$trajectory_playground ()Lkotlin/jvm/functions/Function3;
+}
+
+public final class MainKt {
+	public static final fun closePoints (Landroidx/compose/runtime/Composer;I)V
+	public static final fun doubleObstacle (Landroidx/compose/runtime/Composer;I)V
+	public static final fun main ()V
+	public static synthetic fun main ([Ljava/lang/String;)V
+	public static final fun obstacle (Lcenter/sciprog/maps/features/FeatureGroup;Lspace/kscience/trajectory/Obstacle;Lkotlin/jvm/functions/Function1;)V
+	public static synthetic fun obstacle$default (Lcenter/sciprog/maps/features/FeatureGroup;Lspace/kscience/trajectory/Obstacle;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)V
+	public static final fun playground (Landroidx/compose/runtime/Composer;I)V
+	public static final fun pose (Lcenter/sciprog/maps/features/FeatureGroup;Lspace/kscience/trajectory/Pose2D;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun singleObstacle (Landroidx/compose/runtime/Composer;I)V
+	public static final fun trajectory (Lcenter/sciprog/maps/features/FeatureGroup;Lspace/kscience/trajectory/Trajectory2D;Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun trajectory$default (Lcenter/sciprog/maps/features/FeatureGroup;Lspace/kscience/trajectory/Trajectory2D;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+}
+

demo/trajectory-playground/build.gradle.kts

@@ -0,0 +1,30 @@
+plugins {
+    kotlin("multiplatform")
+    id("org.jetbrains.compose")
+}
+
+val ktorVersion: String by rootProject.extra
+
+kotlin {
+    jvm()
+    jvmToolchain(11)
+    sourceSets {
+        val jvmMain by getting {
+            dependencies {
+                implementation(projects.mapsKtScheme)
+                implementation(projects.trajectoryKt)
+                implementation(compose.desktop.currentOs)
+                implementation(spclibs.logback.classic)
+            }
+        }
+        val jvmTest by getting
+    }
+}
+
+compose {
+    desktop {
+        application {
+            mainClass = "MainKt"
+        }
+    }
+}

demo/trajectory-playground/src/jvmMain/kotlin/Main.kt

@@ -0,0 +1,195 @@
+import androidx.compose.desktop.ui.tooling.preview.Preview
+import androidx.compose.foundation.layout.Column
+import androidx.compose.material.Button
+import androidx.compose.material.MaterialTheme
+import androidx.compose.material.Scaffold
+import androidx.compose.material.Text
+import androidx.compose.runtime.*
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.window.Window
+import androidx.compose.ui.window.application
+import center.sciprog.maps.features.*
+import center.sciprog.maps.scheme.SchemeView
+import center.sciprog.maps.scheme.XY
+import space.kscience.kmath.geometry.Angle
+import space.kscience.kmath.geometry.Circle2D
+import space.kscience.kmath.geometry.DoubleVector2D
+import space.kscience.kmath.geometry.Euclidean2DSpace
+import space.kscience.trajectory.*
+import kotlin.random.Random
+
+private fun DoubleVector2D.toXY() = XY(x.toFloat(), y.toFloat())
+
+private val random = Random(123)
+
+fun FeatureGroup<XY>.trajectory(
+    trajectory: Trajectory2D,
+    colorPicker: (Trajectory2D) -> Color = { Color.Blue },
+): FeatureRef<XY, FeatureGroup<XY>> = group {
+    when (trajectory) {
+        is StraightTrajectory2D -> line(
+            aCoordinates = trajectory.begin.toXY(),
+            bCoordinates = trajectory.end.toXY(),
+        ).color(colorPicker(trajectory))
+
+        is CircleTrajectory2D -> with(Euclidean2DSpace) {
+            val topLeft = trajectory.circle.center + vector(-trajectory.circle.radius, trajectory.circle.radius)
+            val bottomRight = trajectory.circle.center + vector(trajectory.circle.radius, -trajectory.circle.radius)
+
+            val rectangle = Rectangle(
+                topLeft.toXY(),
+                bottomRight.toXY()
+            )
+
+            arc(
+                oval = rectangle,
+                startAngle = trajectory.arcStart - Angle.piDiv2,
+                arcLength = trajectory.arcAngle,
+            ).color(colorPicker(trajectory))
+        }
+
+        is CompositeTrajectory2D -> trajectory.segments.forEach {
+            trajectory(it, colorPicker)
+        }
+    }
+}
+
+fun FeatureGroup<XY>.obstacle(obstacle: Obstacle, colorPicker: (Trajectory2D) -> Color = { Color.Red }) {
+    trajectory(obstacle.circumvention, colorPicker)
+    polygon(obstacle.arcs.map { it.center.toXY() }).color(Color.Gray)
+}
+
+fun FeatureGroup<XY>.pose(pose2D: Pose2D) = with(Euclidean2DSpace) {
+    line(pose2D.toXY(), (pose2D + Pose2D.bearingToVector(pose2D.bearing)).toXY())
+}
+
+@Composable
+@Preview
+fun closePoints() {
+    SchemeView {
+
+        val obstacle = Obstacle(
+            Circle2D(Euclidean2DSpace.vector(0.0, 0.0), 1.0),
+            Circle2D(Euclidean2DSpace.vector(0.0, 1.0), 1.0),
+            Circle2D(Euclidean2DSpace.vector(1.0, 1.0), 1.0),
+            Circle2D(Euclidean2DSpace.vector(1.0, 0.0), 1.0)
+        )
+        val enter = Pose2D(-0.8, -0.8, Angle.pi)
+        val exit = Pose2D(-0.8, -0.8, Angle.piDiv2)
+
+        pose(enter)
+        pose(exit)
+
+        val paths: List<Trajectory2D> = Obstacles.avoidObstacles(
+            enter,
+            exit,
+            1.0,
+            obstacle
+        )
+
+        obstacle(obstacle)
+
+        paths.forEach {
+            val color = Color(random.nextInt())
+            trajectory(it) { color }
+        }
+
+    }
+}
+
+@Composable
+@Preview
+fun singleObstacle() {
+    SchemeView {
+        val obstacle = Obstacle(Circle2D(Euclidean2DSpace.vector(7.0, 1.0), 5.0))
+        val enter = Pose2D(-5, -1, Angle.pi / 4)
+        val exit = Pose2D(20, 4, Angle.pi * 3 / 4)
+
+        pose(enter)
+        pose(exit)
+        obstacle(obstacle)
+
+        Obstacles.avoidObstacles(
+            enter,
+            exit,
+            0.5,
+            obstacle
+        ).forEach {
+            val color = Color(random.nextInt())
+            trajectory(it) { color }
+        }
+    }
+}
+
+@Composable
+@Preview
+fun doubleObstacle() {
+    SchemeView {
+        val obstacles = arrayOf(
+            Obstacle(
+                Circle2D(Euclidean2DSpace.vector(1.0, 6.5), 0.5),
+                Circle2D(Euclidean2DSpace.vector(2.0, 1.0), 0.5),
+                Circle2D(Euclidean2DSpace.vector(6.0, 0.0), 0.5),
+                Circle2D(Euclidean2DSpace.vector(5.0, 5.0), 0.5)
+            ), Obstacle(
+                Circle2D(Euclidean2DSpace.vector(10.0, 1.0), 0.5),
+                Circle2D(Euclidean2DSpace.vector(16.0, 0.0), 0.5),
+                Circle2D(Euclidean2DSpace.vector(14.0, 6.0), 0.5),
+                Circle2D(Euclidean2DSpace.vector(9.0, 4.0), 0.5)
+            )
+        )
+
+        obstacles.forEach { obstacle(it) }
+        val enter = Pose2D(-5, -1, Angle.pi / 4)
+        val exit = Pose2D(20, 4, Angle.pi * 3 / 4)
+        pose(enter)
+        pose(exit)
+
+        Obstacles.avoidObstacles(
+            enter,
+            exit,
+            0.5,
+            *obstacles
+        ).forEach {
+            val color = Color(random.nextInt())
+            trajectory(it) { color }
+        }
+    }
+}
+
+
+@Composable
+@Preview
+fun playground() {
+    val examples = listOf(
+        "Close starting points",
+        "Single obstacle",
+        "Two obstacles",
+    )
+
+    var currentExample by remember { mutableStateOf(examples.first()) }
+
+    Scaffold(floatingActionButton = {
+        Column {
+            examples.forEach {
+                Button(onClick = { currentExample = it }) {
+                    Text(it)
+                }
+            }
+        }
+    }) {
+        when (currentExample) {
+            examples[0] -> closePoints()
+            examples[1] -> singleObstacle()
+            examples[2] -> doubleObstacle()
+        }
+    }
+}
+
+fun main() = application {
+    Window(title = "Trajectory-playground", onCloseRequest = ::exitApplication) {
+        MaterialTheme {
+            playground()
+        }
+    }
+}

docs/templates/ARTIFACT-TEMPLATE.md

@@ -0,0 +1,17 @@
+## Artifact:
+
+The Maven coordinates of this project are `${group}:${name}:${version}`.
+
+**Gradle Kotlin DSL:**
+```kotlin
+repositories {
+    maven("https://repo.kotlin.link")
+    mavenCentral()
+    // development and snapshot versions
+    maven("https://maven.pkg.jetbrains.space/spc/p/sci/dev")
+}
+
+dependencies {
+    implementation("${group}:${name}:${version}")
+}
+```

docs/templates/README-TEMPLATE.md

@@ -0,0 +1,9 @@
+# Maps-kt
+
+This repository is a work-in-progress implementation of Map-with-markers component for Compose-Multiplatform
+
+![](docs/images/Screenshot%202023-01-12%20110429.png)
+
+## Modules
+
+${modules}

gradle.properties

@@ -1,5 +1,10 @@
 kotlin.code.style=official
-kotlin.version=1.6.10
+
-compose.version=1.1.1
+compose.version=1.4.0
-agp.version=4.2.2
+agp.version=7.4.2
 android.useAndroidX=true
+org.jetbrains.compose.experimental.jscanvas.enabled=true
+
+org.gradle.jvmargs=-Xmx4096m
+
+toolsVersion=0.14.6-kotlin-1.8.20

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.1.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

maps-kt-compose/README.md

@@ -0,0 +1,33 @@
+# Module kmath-core
+
+The core interfaces of KMath.
+
+ - [osm](#) : OpenStreetMap tile provider.
+
+
+## Artifact:
+
+The Maven coordinates of this project are `center.sciprog:maps-kt-compose:0.2.2`.
+
+**Gradle Groovy:**
+```groovy
+repositories {
+    maven { url 'https://repo.kotlin.link' }
+    mavenCentral()
+}
+
+dependencies {
+    implementation 'center.sciprog:maps-kt-compose:0.2.2'
+}
+```
+**Gradle Kotlin DSL:**
+```kotlin
+repositories {
+    maven("https://repo.kotlin.link")
+    mavenCentral()
+}
+
+dependencies {
+    implementation("center.sciprog:maps-kt-compose:0.2.2")
+}
+```

maps-kt-compose/build.gradle.kts

@@ -1,30 +1,43 @@
-import org.jetbrains.compose.compose
-
 plugins {
-    kotlin("multiplatform")
+    id("space.kscience.gradle.mpp")
     id("org.jetbrains.compose")
     `maven-publish`
 }
 
-val ktorVersion: String by rootProject.extra
+kscience{
+    jvm()
+}
 
 kotlin {
-    explicitApi = org.jetbrains.kotlin.gradle.dsl.ExplicitApiMode.Warning
-    jvm {
-        compilations.all {
-            kotlinOptions.jvmTarget = "11"
-        }
-    }
     sourceSets {
         commonMain {
             dependencies {
                 api(projects.mapsKtCore)
+                api(projects.mapsKtFeatures)
                 api(compose.foundation)
-                api("io.ktor:ktor-client-core:$ktorVersion")
+                api(project.dependencies.platform(spclibs.ktor.bom))
+                api("io.ktor:ktor-client-core")
                 api("io.github.microutils:kotlin-logging:2.1.23")
             }
         }
-        val jvmMain by getting
+        val jvmTest by getting {
-        val jvmTest by getting
+            dependencies {
+                implementation("io.ktor:ktor-client-cio")
+                implementation(compose.desktop.currentOs)
+                implementation(spclibs.kotlinx.coroutines.test)
+
+                implementation(spclibs.logback.classic)
+            }
+        }
     }
 }
+
+readme {
+    description = "Compose-multiplaform implementation for web-mercator tiled maps"
+    maturity = space.kscience.gradle.Maturity.EXPERIMENTAL
+    propertyByTemplate("artifact", rootProject.file("docs/templates/ARTIFACT-TEMPLATE.md"))
+
+    feature(
+        id = "osm",
+    ) { "OpenStreetMap tile provider." }
+}

maps-kt-compose/docs/README-TEMPLATE.md

@@ -0,0 +1,7 @@
+# Module kmath-core
+
+The core interfaces of KMath.
+
+${features}
+
+${artifact}

maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/GmcRectangle.kt

@@ -0,0 +1,74 @@
+package center.sciprog.maps.compose
+
+import center.sciprog.maps.coordinates.GeodeticMapCoordinates
+import center.sciprog.maps.coordinates.Gmc
+import center.sciprog.maps.features.Rectangle
+import space.kscience.kmath.geometry.Angle
+import space.kscience.kmath.geometry.abs
+
+internal fun Angle.isBetween(a: Angle, b: Angle) = this in a..b || this in b..a
+
+/**
+ * A section of the map between two parallels and two meridians. The figure represents a square in a Mercator projection.
+ * Params are two opposing "corners" of  quasi-square.
+ *
+ * Note that this is a rectangle only on a Mercator projection.
+ */
+internal data class GmcRectangle(
+    override val a: GeodeticMapCoordinates,
+    override val b: GeodeticMapCoordinates,
+) : Rectangle<Gmc> {
+    override val center: GeodeticMapCoordinates
+        get() = GeodeticMapCoordinates.normalized(
+            (a.latitude + b.latitude) / 2,
+            (a.longitude + b.longitude) / 2
+        )
+
+
+    override fun contains(point: Gmc): Boolean =
+        point.latitude.isBetween(a.latitude, b.latitude) && point.longitude.isBetween(a.longitude, b.longitude)
+}
+
+/**
+ * Minimum longitude
+ */
+public val Rectangle<Gmc>.left: Angle get() = minOf(a.longitude, b.longitude)
+
+/**
+ * maximum longitude
+ */
+public val Rectangle<Gmc>.right: Angle get() = maxOf(a.longitude, b.longitude)
+
+/**
+ * Maximum latitude
+ */
+public val Rectangle<Gmc>.top: Angle get() = maxOf(a.latitude, b.latitude)
+
+/**
+ * Minimum latitude
+ */
+public val Rectangle<Gmc>.bottom: Angle get() = minOf(a.latitude, b.latitude)
+
+public val Rectangle<Gmc>.longitudeDelta: Angle get() = abs(a.longitude - b.longitude)
+public val Rectangle<Gmc>.latitudeDelta: Angle get() = abs(a.latitude - b.latitude)
+
+public val Rectangle<Gmc>.topLeft: Gmc get() = Gmc.normalized(top, left)
+public val Rectangle<Gmc>.bottomRight: Gmc get() = Gmc.normalized(bottom, right)
+
+//public fun GmcRectangle.enlarge(
+//    top: Distance,
+//    bottom: Distance = top,
+//    left: Distance = top,
+//    right: Distance = left,
+//): GmcRectangle {
+//
+//}
+//
+//public fun GmcRectangle.enlarge(
+//    top: Angle,
+//    bottom: Angle = top,
+//    left: Angle = top,
+//    right: Angle = left,
+//): GmcRectangle {
+//
+//}

maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/MapFeature.kt

@@ -1,174 +0,0 @@
-package center.sciprog.maps.compose
-
-import androidx.compose.runtime.Composable
-import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.graphics.ImageBitmap
-import androidx.compose.ui.graphics.PointMode
-import androidx.compose.ui.graphics.drawscope.DrawScope
-import androidx.compose.ui.graphics.painter.Painter
-import androidx.compose.ui.graphics.vector.ImageVector
-import androidx.compose.ui.graphics.vector.rememberVectorPainter
-import androidx.compose.ui.unit.DpSize
-import androidx.compose.ui.unit.IntSize
-import androidx.compose.ui.unit.dp
-import center.sciprog.maps.coordinates.*
-import kotlin.math.floor
-
-public interface MapFeature {
-    public val zoomRange: IntRange
-    public fun getBoundingBox(zoom: Double): GmcRectangle?
-
-}
-
-public interface DraggableMapFeature : MapFeature {
-    public fun withCoordinates(newCoordinates: GeodeticMapCoordinates): MapFeature
-}
-
-public fun Iterable<MapFeature>.computeBoundingBox(zoom: Double): GmcRectangle? =
-    mapNotNull { it.getBoundingBox(zoom) }.wrapAll()
-
-internal fun Pair<Double, Double>.toCoordinates() = GeodeticMapCoordinates.ofDegrees(first, second)
-
-internal val defaultZoomRange = 1..18
-
-/**
- * A feature that decides what to show depending on the zoom value (it could change size of shape)
- */
-public class MapFeatureSelector(
-    public val selector: (zoom: Int) -> MapFeature,
-) : MapFeature {
-    override val zoomRange: IntRange get() = defaultZoomRange
-
-    override fun getBoundingBox(zoom: Double): GmcRectangle? = selector(floor(zoom).toInt()).getBoundingBox(zoom)
-}
-
-public class MapDrawFeature(
-    public val position: GeodeticMapCoordinates,
-    override val zoomRange: IntRange = defaultZoomRange,
-    public val drawFeature: DrawScope.() -> Unit,
-) : DraggableMapFeature {
-    override fun getBoundingBox(zoom: Double): GmcRectangle {
-        //TODO add box computation
-        return GmcRectangle(position, position)
-    }
-
-    override fun withCoordinates(newCoordinates: GeodeticMapCoordinates): MapFeature =
-        MapDrawFeature(newCoordinates, zoomRange, drawFeature)
-}
-
-public class MapPointsFeature(
-    public val points: List<GeodeticMapCoordinates>,
-    override val zoomRange: IntRange = defaultZoomRange,
-    public val stroke: Float = 2f,
-    public val color: Color = Color.Red,
-    public val pointMode: PointMode = PointMode.Points,
-) : MapFeature {
-    override fun getBoundingBox(zoom: Double): GmcRectangle {
-        return GmcRectangle(points.first(), points.last())
-    }
-}
-
-public class MapCircleFeature(
-    public val center: GeodeticMapCoordinates,
-    override val zoomRange: IntRange = defaultZoomRange,
-    public val size: Float = 5f,
-    public val color: Color = Color.Red,
-) : DraggableMapFeature {
-    override fun getBoundingBox(zoom: Double): GmcRectangle {
-        val scale = WebMercatorProjection.scaleFactor(zoom)
-        return GmcRectangle.square(center, (size/scale).radians, (size/scale).radians)
-    }
-
-    override fun withCoordinates(newCoordinates: GeodeticMapCoordinates): MapFeature =
-        MapCircleFeature(newCoordinates, zoomRange, size, color)
-}
-
-public class MapRectangleFeature(
-    public val center: GeodeticMapCoordinates,
-    override val zoomRange: IntRange = defaultZoomRange,
-    public val size: DpSize = DpSize(5.dp, 5.dp),
-    public val color: Color = Color.Red,
-) : DraggableMapFeature {
-    override fun getBoundingBox(zoom: Double): GmcRectangle {
-        val scale = WebMercatorProjection.scaleFactor(zoom)
-        return GmcRectangle.square(center, (size.height.value/scale).radians, (size.width.value/scale).radians)
-    }
-
-    override fun withCoordinates(newCoordinates: GeodeticMapCoordinates): MapFeature =
-        MapRectangleFeature(newCoordinates, zoomRange, size, color)
-}
-
-public class MapLineFeature(
-    public val a: GeodeticMapCoordinates,
-    public val b: GeodeticMapCoordinates,
-    override val zoomRange: IntRange = defaultZoomRange,
-    public val color: Color = Color.Red,
-) : MapFeature {
-    override fun getBoundingBox(zoom: Double): GmcRectangle = GmcRectangle(a, b)
-}
-
-public class MapArcFeature(
-    public val oval: GmcRectangle,
-    public val startAngle: Float,
-    public val endAngle: Float,
-    override val zoomRange: IntRange = defaultZoomRange,
-    public val color: Color = Color.Red,
-) : MapFeature {
-    override fun getBoundingBox(zoom: Double): GmcRectangle = oval
-}
-
-public class MapBitmapImageFeature(
-    public val position: GeodeticMapCoordinates,
-    public val image: ImageBitmap,
-    public val size: IntSize = IntSize(15, 15),
-    override val zoomRange: IntRange = defaultZoomRange,
-) : DraggableMapFeature {
-    override fun getBoundingBox(zoom: Double): GmcRectangle = GmcRectangle(position, position)
-
-    override fun withCoordinates(newCoordinates: GeodeticMapCoordinates): MapFeature =
-        MapBitmapImageFeature(newCoordinates, image, size, zoomRange)
-}
-
-public class MapVectorImageFeature(
-    public val position: GeodeticMapCoordinates,
-    public val painter: Painter,
-    public val size: DpSize,
-    override val zoomRange: IntRange = defaultZoomRange,
-) : DraggableMapFeature{
-    override fun getBoundingBox(zoom: Double): GmcRectangle = GmcRectangle(position, position)
-
-    override fun withCoordinates(newCoordinates: GeodeticMapCoordinates): MapFeature =
-        MapVectorImageFeature(newCoordinates,painter, size, zoomRange)
-}
-
-@Composable
-public fun MapVectorImageFeature(
-    position: GeodeticMapCoordinates,
-    image: ImageVector,
-    size: DpSize = DpSize(20.dp, 20.dp),
-    zoomRange: IntRange = defaultZoomRange,
-): MapVectorImageFeature = MapVectorImageFeature(position, rememberVectorPainter(image), size, zoomRange)
-
-/**
- * A group of other features
- */
-public class MapFeatureGroup(
-    public val children: Map<FeatureId, MapFeature>,
-    override val zoomRange: IntRange = defaultZoomRange,
-) : MapFeature {
-    override fun getBoundingBox(zoom: Double): GmcRectangle? =
-        children.values.mapNotNull { it.getBoundingBox(zoom) }.wrapAll()
-}
-
-public class MapTextFeature(
-    public val position: GeodeticMapCoordinates,
-    public val text: String,
-    override val zoomRange: IntRange = defaultZoomRange,
-    public val color: Color,
-    public val fontConfig: MapTextFeatureFont.() -> Unit,
-) : DraggableMapFeature{
-    override fun getBoundingBox(zoom: Double): GmcRectangle = GmcRectangle(position, position)
-
-    override fun withCoordinates(newCoordinates: GeodeticMapCoordinates): MapFeature =
-        MapTextFeature(newCoordinates, text, zoomRange, color, fontConfig)
-}

maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/MapFeatureBuilder.kt

@@ -1,190 +0,0 @@
-package center.sciprog.maps.compose
-
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.mutableStateMapOf
-import androidx.compose.runtime.snapshots.SnapshotStateMap
-import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.graphics.PointMode
-import androidx.compose.ui.graphics.drawscope.DrawScope
-import androidx.compose.ui.graphics.vector.ImageVector
-import androidx.compose.ui.unit.DpSize
-import androidx.compose.ui.unit.dp
-import center.sciprog.maps.coordinates.Distance
-import center.sciprog.maps.coordinates.GeodeticMapCoordinates
-import center.sciprog.maps.coordinates.GmcRectangle
-
-public typealias FeatureId = String
-
-public interface MapFeatureAttributeKey<T>
-
-
-public class MapFeatureAttributeSet(private val map: Map<MapFeatureAttributeKey<*>, *>) {
-    public operator fun <T> get(key: MapFeatureAttributeKey<*>): T? = map[key]?.let {
-        @Suppress("UNCHECKED_CAST")
-        it as T
-    }
-}
-
-public interface MapFeatureBuilder {
-    public fun addFeature(id: FeatureId?, feature: MapFeature): FeatureId
-
-    public fun <T> setAttribute(id: FeatureId, key: MapFeatureAttributeKey<T>, value: T)
-
-    public val features: MutableMap<FeatureId, MapFeature>
-
-    public fun attributes(): Map<FeatureId, MapFeatureAttributeSet>
-
-    //TODO use context receiver for that
-    public fun FeatureId.draggable(enabled: Boolean = true) {
-        setAttribute(this, DraggableAttribute, enabled)
-    }
-}
-
-internal class MapFeatureBuilderImpl(
-    override val features: SnapshotStateMap<FeatureId, MapFeature>,
-) : MapFeatureBuilder {
-
-    private val attributes = SnapshotStateMap<FeatureId, SnapshotStateMap<MapFeatureAttributeKey<out Any?>, in Any?>>()
-
-
-    private fun generateID(feature: MapFeature): FeatureId = "@feature[${feature.hashCode().toUInt()}]"
-
-    override fun addFeature(id: FeatureId?, feature: MapFeature): FeatureId {
-        val safeId = id ?: generateID(feature)
-        features[id ?: generateID(feature)] = feature
-        return safeId
-    }
-
-    override fun <T> setAttribute(id: FeatureId, key: MapFeatureAttributeKey<T>, value: T) {
-        attributes.getOrPut(id) { SnapshotStateMap() }[key] = value
-    }
-
-    override fun attributes(): Map<FeatureId, MapFeatureAttributeSet> =
-        attributes.mapValues { MapFeatureAttributeSet(it.value) }
-
-}
-
-public fun MapFeatureBuilder.circle(
-    center: GeodeticMapCoordinates,
-    zoomRange: IntRange = defaultZoomRange,
-    size: Float = 5f,
-    color: Color = Color.Red,
-    id: FeatureId? = null,
-): FeatureId = addFeature(
-    id, MapCircleFeature(center, zoomRange, size, color)
-)
-
-public fun MapFeatureBuilder.circle(
-    centerCoordinates: Pair<Double, Double>,
-    zoomRange: IntRange = defaultZoomRange,
-    size: Float = 5f,
-    color: Color = Color.Red,
-    id: FeatureId? = null,
-): FeatureId = addFeature(
-    id, MapCircleFeature(centerCoordinates.toCoordinates(), zoomRange, size, color)
-)
-
-public fun MapFeatureBuilder.rectangle(
-    centerCoordinates: Pair<Double, Double>,
-    zoomRange: IntRange = defaultZoomRange,
-    size: DpSize = DpSize(5.dp, 5.dp),
-    color: Color = Color.Red,
-    id: FeatureId? = null,
-): FeatureId = addFeature(
-    id, MapRectangleFeature(centerCoordinates.toCoordinates(), zoomRange, size, color)
-)
-
-public fun MapFeatureBuilder.draw(
-    position: Pair<Double, Double>,
-    zoomRange: IntRange = defaultZoomRange,
-    id: FeatureId? = null,
-    drawFeature: DrawScope.() -> Unit,
-): FeatureId = addFeature(id, MapDrawFeature(position.toCoordinates(), zoomRange, drawFeature))
-
-public fun MapFeatureBuilder.line(
-    aCoordinates: Pair<Double, Double>,
-    bCoordinates: Pair<Double, Double>,
-    zoomRange: IntRange = defaultZoomRange,
-    color: Color = Color.Red,
-    id: FeatureId? = null,
-): FeatureId = addFeature(
-    id,
-    MapLineFeature(aCoordinates.toCoordinates(), bCoordinates.toCoordinates(), zoomRange, color)
-)
-
-public fun MapFeatureBuilder.arc(
-    oval: GmcRectangle,
-    startAngle: Number,
-    endAngle: Number,
-    zoomRange: IntRange = defaultZoomRange,
-    color: Color = Color.Red,
-    id: FeatureId? = null,
-): FeatureId = addFeature(
-    id,
-    MapArcFeature(oval, startAngle.toFloat(), endAngle.toFloat(), zoomRange, color)
-)
-
-public fun MapFeatureBuilder.arc(
-    center: Pair<Double, Double>,
-    radius: Distance,
-    startAngle: Number,
-    endAngle: Number,
-    zoomRange: IntRange = defaultZoomRange,
-    color: Color = Color.Red,
-    id: FeatureId? = null,
-): FeatureId = addFeature(
-    id,
-    MapArcFeature(
-        GmcRectangle.square(center.toCoordinates(), radius, radius),
-        startAngle.toFloat(),
-        endAngle.toFloat(),
-        zoomRange,
-        color
-    )
-)
-
-public fun MapFeatureBuilder.points(
-    points: List<Pair<Double, Double>>,
-    zoomRange: IntRange = defaultZoomRange,
-    stroke: Float = 2f,
-    color: Color = Color.Red,
-    pointMode: PointMode = PointMode.Points,
-    id: FeatureId? = null,
-): FeatureId = addFeature(id, MapPointsFeature(points.map { it.toCoordinates() }, zoomRange, stroke, color, pointMode))
-
-@Composable
-public fun MapFeatureBuilder.image(
-    position: Pair<Double, Double>,
-    image: ImageVector,
-    size: DpSize = DpSize(20.dp, 20.dp),
-    zoomRange: IntRange = defaultZoomRange,
-    id: FeatureId? = null,
-): FeatureId = addFeature(id, MapVectorImageFeature(position.toCoordinates(), image, size, zoomRange))
-
-public fun MapFeatureBuilder.group(
-    zoomRange: IntRange = defaultZoomRange,
-    id: FeatureId? = null,
-    builder: MapFeatureBuilder.() -> Unit,
-): FeatureId {
-    val map = MapFeatureBuilderImpl(mutableStateMapOf()).apply(builder).features
-    val feature = MapFeatureGroup(map, zoomRange)
-    return addFeature(id, feature)
-}
-
-public fun MapFeatureBuilder.text(
-    position: GeodeticMapCoordinates,
-    text: String,
-    zoomRange: IntRange = defaultZoomRange,
-    color: Color = Color.Red,
-    font: MapTextFeatureFont.() -> Unit = { size = 16f },
-    id: FeatureId? = null,
-): FeatureId = addFeature(id, MapTextFeature(position, text, zoomRange, color, font))
-
-public fun MapFeatureBuilder.text(
-    position: Pair<Double, Double>,
-    text: String,
-    zoomRange: IntRange = defaultZoomRange,
-    color: Color = Color.Red,
-    font: MapTextFeatureFont.() -> Unit = { size = 16f },
-    id: FeatureId? = null,
-): FeatureId = addFeature(id, MapTextFeature(position.toCoordinates(), text, zoomRange, color, font))

maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/MapTextFeatureFont.kt

@@ -1,5 +0,0 @@
-package center.sciprog.maps.compose
-
-public expect class MapTextFeatureFont {
-    public var size: Float
-}

maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/MapTileProvider.kt

@@ -1,8 +1,8 @@
 package center.sciprog.maps.compose
 
-import androidx.compose.ui.graphics.ImageBitmap
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Deferred
+import org.jetbrains.skia.Image
 import kotlin.math.floor
 
 public data class TileId(
@@ -13,7 +13,7 @@ public data class TileId(
 
 public data class MapTile(
     val id: TileId,
-    val image: ImageBitmap,
+    val image: Image,
 )
 
 public interface MapTileProvider {
@@ -21,9 +21,9 @@ public interface MapTileProvider {
 
     public val tileSize: Int get() = DEFAULT_TILE_SIZE
 
-    public fun toIndex(d: Double): Int = floor(d / tileSize).toInt()
+    public fun toIndex(d: Float): Int = floor(d / tileSize).toInt()
 
-    public fun toCoordinate(i: Int): Double = (i * tileSize).toDouble()
+    public fun toCoordinate(i: Int): Float = (i * tileSize).toFloat()
 
     public companion object {
         public const val DEFAULT_TILE_SIZE: Int = 256

maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/MapView.kt

@@ -1,155 +1,70 @@
 package center.sciprog.maps.compose
 
 import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.runtime.*
+import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.input.pointer.PointerEvent
+import center.sciprog.maps.coordinates.Gmc
-import androidx.compose.ui.input.pointer.isPrimaryPressed
+import center.sciprog.maps.features.*
-import androidx.compose.ui.unit.DpSize
-import center.sciprog.maps.coordinates.*
-import kotlin.math.PI
-import kotlin.math.log2
-import kotlin.math.min
 
 
-public fun interface DragHandle {
-    /**
-     * @param event - qualifiers of the event used for drag
-     * @param start - is a point where drag begins, end is a point where drag ends
-     * @param end - end point of the drag
-     *
-     * @return true if default event processors should be used after this one
-     */
-    public fun handle(event: PointerEvent, start: MapViewPoint, end: MapViewPoint): Boolean
-
-    public companion object {
-        public val BYPASS: DragHandle = DragHandle { _, _, _ -> true }
-
-        /**
-         * Process only events with primary button pressed
-         */
-        public fun withPrimaryButton(
-            block: (event: PointerEvent, start: MapViewPoint, end: MapViewPoint) -> Boolean,
-        ): DragHandle = DragHandle { event, start, end ->
-            if (event.buttons.isPrimaryPressed) {
-                block(event, start, end)
-            } else {
-                false
-            }
-        }
-
-        /**
-         * Combine several handles into one
-         */
-        public fun combine(vararg handles: DragHandle): DragHandle = DragHandle { event, start, end ->
-            handles.forEach {
-                if (!it.handle(event, start, end)) return@DragHandle false
-            }
-            return@DragHandle true
-        }
-    }
-}
-
-//TODO consider replacing by modifier
-/**
- */
-public data class MapViewConfig(
-    val zoomSpeed: Double = 1.0 / 3.0,
-    val inferViewBoxFromFeatures: Boolean = false,
-    val onClick: MapViewPoint.(PointerEvent) -> Unit = {},
-    val dragHandle: DragHandle = DragHandle.BYPASS,
-    val onViewChange: MapViewPoint.() -> Unit = {},
-    val onSelect: (GmcRectangle) -> Unit = {},
-    val zoomOnSelect: Boolean = true,
-    val resetViewPoint: Boolean = false,
-)
-
 @Composable
 public expect fun MapView(
-    mapTileProvider: MapTileProvider,
+    viewScope: MapViewScope,
-    computeViewPoint: (canvasSize: DpSize) -> MapViewPoint,
+    features: FeatureGroup<Gmc>,
-    features: Map<FeatureId, MapFeature>,
-    config: MapViewConfig = MapViewConfig(),
     modifier: Modifier = Modifier.fillMaxSize(),
 )
 
-private fun prepareConfig(initialConfig: MapViewConfig, featureBuilder: MapFeatureBuilder): MapViewConfig {
+/**
-    val draggableFeatureIds: Set<FeatureId> = featureBuilder.attributes().filterValues {
+ * A builder for a Map with static features.
-        it[DraggableAttribute] ?: false
+ */
-    }.keys
-
-    val features = featureBuilder.features
-
-    val featureDrag = DragHandle.withPrimaryButton { _, start, end ->
-        val zoom = start.zoom
-        draggableFeatureIds.forEach { id ->
-            val feature = features[id] as? DraggableMapFeature ?: return@forEach
-            //val border = WebMercatorProjection.scaleFactor(zoom)
-            val boundingBox = feature.getBoundingBox(zoom) ?: return@forEach
-            if (start.focus in boundingBox) {
-                features[id] = feature.withCoordinates(end.focus)
-                return@withPrimaryButton false
-            }
-        }
-        return@withPrimaryButton true
-    }
-    return initialConfig.copy(
-        dragHandle = DragHandle.combine(featureDrag, initialConfig.dragHandle),
-    )
-}
-
 @Composable
 public fun MapView(
     mapTileProvider: MapTileProvider,
-    initialViewPoint: MapViewPoint,
+    features: FeatureGroup<Gmc>,
-    config: MapViewConfig = MapViewConfig(),
+    initialViewPoint: ViewPoint<Gmc>? = null,
+    initialRectangle: Rectangle<Gmc>? = null,
+    config: ViewConfig<Gmc> = ViewConfig(),
     modifier: Modifier = Modifier.fillMaxSize(),
-    buildFeatures: @Composable (MapFeatureBuilder.() -> Unit) = {},
 ) {
-    val featuresBuilder = MapFeatureBuilderImpl(mutableStateMapOf())
-    featuresBuilder.buildFeatures()
-    val features = remember { featuresBuilder.features }
 
-    val newConfig = remember(features) {
+    val mapState: MapViewScope = MapViewScope.remember(
-        prepareConfig(config, featuresBuilder)
-    }
-
-    MapView(
         mapTileProvider,
-        { initialViewPoint },
+        config,
-        features,
+        initialViewPoint = initialViewPoint,
-        newConfig,
+        initialRectangle = initialRectangle ?: features.getBoundingBox(Float.MAX_VALUE),
-        modifier
     )
+
+    MapView(mapState, features, modifier)
 }
 
-internal fun GmcRectangle.computeViewPoint(
+/**
+ * Draw a map using convenient parameters. If neither [initialViewPoint], noe [initialRectangle] is defined,
+ * use map features to infer view region.
+ * @param initialViewPoint The view point of the map using center and zoom. Is used if provided
+ * @param initialRectangle The rectangle to be used for view point computation. Used if [initialViewPoint] is not defined.
+ * @param buildFeatures - a builder for features
+ */
+@Composable
+public fun MapView(
     mapTileProvider: MapTileProvider,
-): (canvasSize: DpSize) -> MapViewPoint = { canvasSize ->
+    initialViewPoint: ViewPoint<Gmc>? = null,
-    val zoom = log2(
+    initialRectangle: Rectangle<Gmc>? = null,
-        min(
+    config: ViewConfig<Gmc> = ViewConfig(),
-            canvasSize.width.value / longitudeDelta.radians.value,
+    modifier: Modifier = Modifier.fillMaxSize(),
-            canvasSize.height.value / latitudeDelta.radians.value
+    buildFeatures: FeatureGroup<Gmc>.() -> Unit = {},
-        ) * PI / mapTileProvider.tileSize
+) {
+
+    val featureState = FeatureGroup.remember(WebMercatorSpace, buildFeatures)
+
+    val mapState: MapViewScope = MapViewScope.remember(
+        mapTileProvider,
+        config,
+        initialViewPoint = initialViewPoint,
+        initialRectangle = initialRectangle ?: featureState.features.computeBoundingBox(
+            WebMercatorSpace,
+            Float.MAX_VALUE
+        ),
     )
-    MapViewPoint(center, zoom)
+
+    MapView(mapState, featureState, modifier)
 }
-//
-//@Composable
-//public fun MapView(
-//    mapTileProvider: MapTileProvider,
-//    box: GmcRectangle,
-//    config: MapViewConfig = MapViewConfig(),
-//    modifier: Modifier = Modifier.fillMaxSize(),
-//    buildFeatures: @Composable (MapFeatureBuilder.() -> Unit) = {},
-//) {
-//    val builder by derivedStateOf { MapFeatureBuilderImpl().apply(buildFeatures) }
-//
-//    MapView(
-//        mapTileProvider,
-//        box.computeViewPoint(mapTileProvider),
-//        builder.features,
-//        prepareConfig(config, builder),
-//        modifier
-//    )
-//}

maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/MapViewPoint.kt

@@ -0,0 +1,20 @@
+package center.sciprog.maps.compose
+
+import center.sciprog.maps.coordinates.GeodeticMapCoordinates
+import center.sciprog.maps.coordinates.Gmc
+import center.sciprog.maps.coordinates.WebMercatorProjection
+import center.sciprog.maps.features.ViewPoint
+
+/**
+ * Observable position on the map. Includes observation coordinate and [zoom] factor
+ */
+internal data class MapViewPoint(
+    override val focus: GeodeticMapCoordinates,
+    override val zoom: Float,
+) : ViewPoint<Gmc>{
+    val scaleFactor: Float by lazy { WebMercatorProjection.scaleFactor(zoom) }
+
+    public companion object{
+        public val globe: MapViewPoint = MapViewPoint(Gmc.ofRadians(0.0, 0.0), 1f)
+    }
+}

maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/MapViewScope.kt

@@ -0,0 +1,100 @@
+package center.sciprog.maps.compose
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.DpOffset
+import androidx.compose.ui.unit.DpRect
+import androidx.compose.ui.unit.dp
+import center.sciprog.maps.coordinates.Gmc
+import center.sciprog.maps.coordinates.MercatorProjection
+import center.sciprog.maps.coordinates.WebMercatorCoordinates
+import center.sciprog.maps.coordinates.WebMercatorProjection
+import center.sciprog.maps.features.*
+import space.kscience.kmath.geometry.radians
+import kotlin.math.*
+
+public class MapViewScope internal constructor(
+    public val mapTileProvider: MapTileProvider,
+    config: ViewConfig<Gmc>,
+) : CoordinateViewScope<Gmc>(config) {
+    override val space: CoordinateSpace<Gmc> get() = WebMercatorSpace
+
+    private val scaleFactor: Float
+        get() = WebMercatorProjection.scaleFactor(zoom)
+
+    public val intZoom: Int get() = floor(zoom).toInt()
+
+    public val centerCoordinates: WebMercatorCoordinates
+        get() = WebMercatorProjection.toMercator(viewPoint.focus, intZoom) ?: WebMercatorCoordinates(intZoom, 0f, 0f)
+
+    public val tileScale: Float
+        get() = 2f.pow(zoom - floor(zoom))
+
+    /*
+     * Convert screen independent offset to GMC, adjusting for fractional zoom
+     */
+    override fun DpOffset.toCoordinates(): Gmc {
+        val mercator = WebMercatorCoordinates(
+            intZoom,
+            (x - canvasSize.width / 2).value / tileScale + centerCoordinates.x,
+            (y - canvasSize.height / 2).value / tileScale + centerCoordinates.y,
+        )
+        return WebMercatorProjection.toGeodetic(mercator)
+    }
+
+    override fun Gmc.toDpOffset(): DpOffset {
+        val mercator = WebMercatorProjection.toMercator(this, intZoom) ?: WebMercatorCoordinates(intZoom, 0f, 0f)
+        return DpOffset(
+            (canvasSize.width / 2 + (mercator.x.dp - centerCoordinates.x.dp) * tileScale),
+            (canvasSize.height / 2 + (mercator.y.dp - centerCoordinates.y.dp) * tileScale)
+        )
+    }
+
+    override fun Rectangle<Gmc>.toDpRect(): DpRect {
+        val topLeft = topLeft.toDpOffset()
+        val bottomRight = bottomRight.toDpOffset()
+        return DpRect(topLeft.x, topLeft.y, bottomRight.x, bottomRight.y)
+    }
+
+    override fun computeViewPoint(rectangle: Rectangle<Gmc>): ViewPoint<Gmc> {
+        val zoom = log2(
+            min(
+                canvasSize.width.value / rectangle.longitudeDelta.radians,
+                canvasSize.height.value / rectangle.latitudeDelta.radians
+            ) * 2 * PI / mapTileProvider.tileSize
+        )
+        return space.ViewPoint(rectangle.center, zoom.toFloat())
+    }
+
+    override fun ViewPoint<Gmc>.moveBy(x: Dp, y: Dp): ViewPoint<Gmc> {
+        val deltaX = x.value / tileScale
+        val deltaY = y.value / tileScale
+        val newCoordinates = Gmc.normalized(
+            (focus.latitude + (deltaY / scaleFactor).radians).coerceIn(
+                -MercatorProjection.MAXIMUM_LATITUDE,
+                MercatorProjection.MAXIMUM_LATITUDE
+            ),
+            focus.longitude + (deltaX / scaleFactor).radians
+        )
+        return space.ViewPoint(newCoordinates, zoom)
+    }
+
+    public companion object {
+        @Composable
+        public fun remember(
+            mapTileProvider: MapTileProvider,
+            config: ViewConfig<Gmc> = ViewConfig(),
+            initialViewPoint: ViewPoint<Gmc>? = null,
+            initialRectangle: Rectangle<Gmc>? = null,
+        ): MapViewScope = remember {
+            MapViewScope(mapTileProvider, config).also { mapState ->
+                if (initialViewPoint != null) {
+                    mapState.viewPoint = initialViewPoint
+                } else if (initialRectangle != null) {
+                    mapState.viewPoint = mapState.computeViewPoint(initialRectangle)
+                }
+            }
+        }
+    }
+}

maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/WebMercatorSpace.kt

@@ -0,0 +1,136 @@
+package center.sciprog.maps.compose
+
+import androidx.compose.ui.unit.DpOffset
+import androidx.compose.ui.unit.DpSize
+import androidx.compose.ui.unit.dp
+import center.sciprog.maps.coordinates.*
+import center.sciprog.maps.features.CoordinateSpace
+import center.sciprog.maps.features.Rectangle
+import center.sciprog.maps.features.ViewPoint
+import space.kscience.kmath.geometry.Angle
+import space.kscience.kmath.geometry.radians
+import kotlin.math.abs
+import kotlin.math.floor
+import kotlin.math.pow
+
+public object WebMercatorSpace : CoordinateSpace<Gmc> {
+
+    private fun intZoom(zoom: Float): Int = floor(zoom).toInt()
+    private fun tileScale(zoom: Float): Float = 2f.pow(zoom - floor(zoom))
+
+
+    override fun Rectangle(first: Gmc, second: Gmc): Rectangle<Gmc> = GmcRectangle(first, second)
+
+    override fun Rectangle(center: Gmc, zoom: Float, size: DpSize): Rectangle<Gmc> {
+        val scale = WebMercatorProjection.scaleFactor(zoom)
+        return Rectangle(center, (size.width.value / scale).radians, (size.height.value / scale).radians)
+    }
+
+    override val defaultViewPoint: ViewPoint<Gmc> = MapViewPoint.globe
+
+    override fun ViewPoint(center: Gmc, zoom: Float): ViewPoint<Gmc> = MapViewPoint(center, zoom)
+
+    override fun ViewPoint<Gmc>.moveBy(delta: Gmc): ViewPoint<Gmc> {
+        val newCoordinates = Gmc.normalized(
+            (focus.latitude + delta.latitude).coerceIn(
+                -MercatorProjection.MAXIMUM_LATITUDE,
+                MercatorProjection.MAXIMUM_LATITUDE
+            ),
+            focus.longitude + delta.longitude
+        )
+        return MapViewPoint(newCoordinates, zoom)
+    }
+
+    override fun ViewPoint<Gmc>.zoomBy(zoomDelta: Float, invariant: Gmc): ViewPoint<Gmc> = if (invariant == focus) {
+        ViewPoint(focus, (zoom + zoomDelta).coerceIn(2f, 18f))
+    } else {
+        val difScale = (1 - 2f.pow(-zoomDelta))
+        val newCenter = Gmc.normalized(
+            focus.latitude + (invariant.latitude - focus.latitude) * difScale,
+            focus.longitude + (invariant.longitude - focus.longitude) * difScale
+        )
+        MapViewPoint(newCenter, (zoom + zoomDelta).coerceIn(2f, 18f))
+    }
+
+    override fun Rectangle<Gmc>.withCenter(center: Gmc): Rectangle<Gmc> =
+        Rectangle(center, height = latitudeDelta, width = longitudeDelta)
+
+    override fun Collection<Rectangle<Gmc>>.wrapRectangles(): Rectangle<Gmc>? {
+        if (isEmpty()) return null
+        //TODO optimize computation
+        val minLat = minOf { it.bottom }
+        val maxLat = maxOf { it.top }
+        val minLong = minOf { it.left }
+        val maxLong = maxOf { it.right }
+        return GmcRectangle(Gmc.normalized(minLat, minLong), Gmc.normalized(maxLat, maxLong))
+    }
+
+    override fun Collection<Gmc>.wrapPoints(): Rectangle<Gmc>? {
+        if (isEmpty()) return null
+        //TODO optimize computation
+        val minLat = minOf { it.latitude }
+        val maxLat = maxOf { it.latitude }
+        val minLong = minOf { it.longitude }
+        val maxLong = maxOf { it.longitude }
+        return GmcRectangle(Gmc.normalized(minLat, minLong), Gmc.normalized(maxLat, maxLong))
+    }
+
+    override fun Gmc.offsetTo(b: Gmc, zoom: Float): DpOffset {
+        val intZoom = intZoom(zoom)
+        val mercatorA = WebMercatorProjection.toMercator(this, intZoom) ?: WebMercatorCoordinates(intZoom, 0f, 0f)
+        val mercatorB = WebMercatorProjection.toMercator(b, intZoom) ?: WebMercatorCoordinates(intZoom, 0f, 0f)
+        val tileScale = tileScale(zoom)
+        return DpOffset(
+            (mercatorA.x - mercatorB.x).dp * tileScale,
+            (mercatorA.y - mercatorB.y).dp * tileScale
+        )
+    }
+
+    override fun Gmc.isInsidePolygon(points: List<Gmc>): Boolean = points.zipWithNext().count { (left, right) ->
+        //using raytracing algorithm with the ray pointing "up"
+        val longitudeRange = if (right.longitude >= left.longitude) {
+            left.longitude..right.longitude
+        } else {
+            right.longitude..left.longitude
+        }
+
+        if (longitude !in longitudeRange) return@count false
+
+        val longitudeDelta = right.longitude - left.longitude
+
+        left.latitude * abs((right.longitude - longitude) / longitudeDelta) +
+                right.latitude * abs((longitude - left.longitude) / longitudeDelta) >= latitude
+    } % 2 == 1
+}
+
+/**
+ * A quasi-square section. Note that latitudinal distance could be imprecise for large distances
+ */
+public fun CoordinateSpace<Gmc>.Rectangle(
+    center: Gmc,
+    height: Distance,
+    width: Distance,
+    ellipsoid: GeoEllipsoid = GeoEllipsoid.WGS84,
+): Rectangle<Gmc> {
+    val reducedRadius = ellipsoid.reducedRadius(center.latitude)
+    return Rectangle(center, (height / ellipsoid.polarRadius).radians, (width / reducedRadius).radians)
+}
+
+/**
+ * A quasi-square section.
+ */
+public fun CoordinateSpace<Gmc>.Rectangle(
+    center: GeodeticMapCoordinates,
+    height: Angle,
+    width: Angle,
+): Rectangle<Gmc> {
+    val a = Gmc.normalized(
+        center.latitude - (height / 2),
+        center.longitude - (width / 2)
+    )
+    val b = Gmc.normalized(
+        center.latitude + (height / 2),
+        center.longitude + (width / 2)
+    )
+    return GmcRectangle(a, b)
+}

maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/drag.kt

@@ -1,3 +0,0 @@
-package center.sciprog.maps.compose
-
-public object DraggableAttribute: MapFeatureAttributeKey<Boolean>

maps-kt-compose/src/commonMain/kotlin/center/sciprog/maps/compose/mapFeatures.kt

@@ -0,0 +1,143 @@
+package center.sciprog.maps.compose
+
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.drawscope.DrawScope
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.DpSize
+import androidx.compose.ui.unit.dp
+import center.sciprog.maps.coordinates.Distance
+import center.sciprog.maps.coordinates.GeodeticMapCoordinates
+import center.sciprog.maps.coordinates.Gmc
+import center.sciprog.maps.coordinates.GmcCurve
+import center.sciprog.maps.features.*
+import space.kscience.kmath.geometry.Angle
+import kotlin.math.ceil
+
+
+internal fun FeatureGroup<Gmc>.coordinatesOf(pair: Pair<Number, Number>) =
+    GeodeticMapCoordinates.ofDegrees(pair.first.toDouble(), pair.second.toDouble())
+
+public typealias MapFeature = Feature<Gmc>
+
+public fun FeatureGroup<Gmc>.circle(
+    centerCoordinates: Pair<Number, Number>,
+    size: Dp = 5.dp,
+    id: String? = null,
+): FeatureRef<Gmc, CircleFeature<Gmc>> = feature(
+    id, CircleFeature(space, coordinatesOf(centerCoordinates), size)
+)
+
+public fun FeatureGroup<Gmc>.rectangle(
+    centerCoordinates: Pair<Number, Number>,
+    size: DpSize = DpSize(5.dp, 5.dp),
+    id: String? = null,
+): FeatureRef<Gmc, RectangleFeature<Gmc>> = feature(
+    id, RectangleFeature(space, coordinatesOf(centerCoordinates), size)
+)
+
+
+public fun FeatureGroup<Gmc>.draw(
+    position: Pair<Number, Number>,
+    id: String? = null,
+    draw: DrawScope.() -> Unit,
+): FeatureRef<Gmc, DrawFeature<Gmc>> = feature(
+    id,
+    DrawFeature(space, coordinatesOf(position), drawFeature = draw)
+)
+
+
+public fun FeatureGroup<Gmc>.line(
+    curve: GmcCurve,
+    id: String? = null,
+): FeatureRef<Gmc, LineFeature<Gmc>> = feature(
+    id,
+    LineFeature(space, curve.forward.coordinates, curve.backward.coordinates)
+)
+
+
+public fun FeatureGroup<Gmc>.line(
+    aCoordinates: Pair<Double, Double>,
+    bCoordinates: Pair<Double, Double>,
+    id: String? = null,
+): FeatureRef<Gmc, LineFeature<Gmc>> = feature(
+    id,
+    LineFeature(space, coordinatesOf(aCoordinates), coordinatesOf(bCoordinates))
+)
+
+
+public fun FeatureGroup<Gmc>.arc(
+    center: Pair<Double, Double>,
+    radius: Distance,
+    startAngle: Angle,
+    arcLength: Angle,
+    id: String? = null,
+): FeatureRef<Gmc, ArcFeature<Gmc>> = feature(
+    id,
+    ArcFeature(
+        space,
+        oval = space.Rectangle(coordinatesOf(center), radius, radius),
+        startAngle = startAngle,
+        arcLength = arcLength,
+    )
+)
+
+public fun FeatureGroup<Gmc>.points(
+    points: List<Pair<Double, Double>>,
+    id: String? = null,
+): FeatureRef<Gmc, PointsFeature<Gmc>> = feature(id, PointsFeature(space, points.map(::coordinatesOf)))
+
+public fun FeatureGroup<Gmc>.multiLine(
+    points: List<Pair<Double, Double>>,
+    id: String? = null,
+): FeatureRef<Gmc, MultiLineFeature<Gmc>> = feature(id, MultiLineFeature(space, points.map(::coordinatesOf)))
+
+public fun FeatureGroup<Gmc>.icon(
+    position: Pair<Double, Double>,
+    image: ImageVector,
+    size: DpSize = DpSize(20.dp, 20.dp),
+    id: String? = null,
+): FeatureRef<Gmc, VectorIconFeature<Gmc>> = feature(
+    id,
+    VectorIconFeature(
+        space,
+        coordinatesOf(position),
+        size,
+        image,
+    )
+)
+
+public fun FeatureGroup<Gmc>.text(
+    position: Pair<Double, Double>,
+    text: String,
+    font: FeatureFont.() -> Unit = { size = 16f },
+    id: String? = null,
+): FeatureRef<Gmc, TextFeature<Gmc>> = feature(
+    id,
+    TextFeature(space, coordinatesOf(position), text, fontConfig = font)
+)
+
+public fun FeatureGroup<Gmc>.pixelMap(
+    rectangle: Rectangle<Gmc>,
+    latitudeDelta: Angle,
+    longitudeDelta: Angle,
+    id: String? = null,
+    builder: (Gmc) -> Color?,
+): FeatureRef<Gmc, PixelMapFeature<Gmc>> = feature(
+    id,
+    PixelMapFeature(
+        space,
+        rectangle,
+        Structure2D(
+            ceil(rectangle.longitudeDelta / latitudeDelta).toInt(),
+            ceil(rectangle.latitudeDelta / longitudeDelta).toInt()
+
+        ) { (i, j) ->
+            val longitude = rectangle.left + longitudeDelta * i
+            val latitude = rectangle.bottom + latitudeDelta * j
+            builder(
+                Gmc(latitude, longitude)
+            )
+        }
+    )
+)

maps-kt-compose/src/jvmMain/kotlin/center/sciprog/maps/compose/MapTextFeatureFontJvm.kt

@@ -1,5 +0,0 @@
-package center.sciprog.maps.compose
-
-import org.jetbrains.skia.Font
-
-public actual typealias MapTextFeatureFont = Font

maps-kt-compose/src/jvmMain/kotlin/center/sciprog/maps/compose/MapViewJvm.kt

@@ -1,371 +0,0 @@
-package center.sciprog.maps.compose
-
-import androidx.compose.foundation.Canvas
-import androidx.compose.foundation.gestures.drag
-import androidx.compose.foundation.gestures.forEachGesture
-import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.runtime.*
-import androidx.compose.runtime.snapshots.SnapshotStateMap
-import androidx.compose.ui.ExperimentalComposeUiApi
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.geometry.Offset
-import androidx.compose.ui.geometry.Rect
-import androidx.compose.ui.graphics.*
-import androidx.compose.ui.graphics.drawscope.*
-import androidx.compose.ui.input.pointer.*
-import androidx.compose.ui.unit.*
-import center.sciprog.maps.coordinates.*
-import kotlinx.coroutines.CancellationException
-import kotlinx.coroutines.launch
-import mu.KotlinLogging
-import org.jetbrains.skia.Font
-import org.jetbrains.skia.Paint
-import kotlin.math.*
-
-
-private fun Color.toPaint(): Paint = Paint().apply {
-    isAntiAlias = true
-    color = toArgb()
-}
-
-private fun IntRange.intersect(other: IntRange) = max(first, other.first)..min(last, other.last)
-
-internal fun MapViewPoint.move(deltaX: Double, deltaY: Double): MapViewPoint {
-    val newCoordinates = GeodeticMapCoordinates(
-        (focus.latitude + (deltaY / scaleFactor).radians).coerceIn(
-            -MercatorProjection.MAXIMUM_LATITUDE,
-            MercatorProjection.MAXIMUM_LATITUDE
-        ),
-        focus.longitude + (deltaX / scaleFactor).radians
-    )
-    return MapViewPoint(newCoordinates, zoom)
-}
-
-private val logger = KotlinLogging.logger("MapView")
-
-/**
- * A component that renders map and provides basic map manipulation capabilities
- */
-
-@Composable
-public actual fun MapView(
-    mapTileProvider: MapTileProvider,
-    computeViewPoint: (canvasSize: DpSize) -> MapViewPoint,
-    features: Map<FeatureId, MapFeature>,
-    config: MapViewConfig,
-    modifier: Modifier,
-) {
-    var canvasSize by remember { mutableStateOf(DpSize(512.dp, 512.dp)) }
-
-    var viewPointInternal: MapViewPoint? by remember {
-        mutableStateOf(null)
-    }
-
-    if (config.resetViewPoint) {
-        viewPointInternal = null
-    }
-
-    val viewPoint: MapViewPoint by derivedStateOf {
-        viewPointInternal ?: if (config.inferViewBoxFromFeatures) {
-            features.values.computeBoundingBox(1.0)?.let { box ->
-                val zoom = log2(
-                    min(
-                        canvasSize.width.value / box.longitudeDelta.radians.value,
-                        canvasSize.height.value / box.latitudeDelta.radians.value
-                    ) * PI / mapTileProvider.tileSize
-                )
-                MapViewPoint(box.center, zoom)
-            } ?: computeViewPoint(canvasSize)
-        } else {
-            computeViewPoint(canvasSize)
-        }
-    }
-
-    val zoom: Int by derivedStateOf {
-        require(viewPoint.zoom in 1.0..18.0) { "Zoom value of ${viewPoint.zoom} is not valid" }
-        floor(viewPoint.zoom).toInt()
-    }
-
-    val tileScale: Double by derivedStateOf {
-        2.0.pow(viewPoint.zoom - zoom)
-    }
-
-    val mapTiles = remember { mutableStateListOf<MapTile>() }
-
-    val centerCoordinates by derivedStateOf { WebMercatorProjection.toMercator(viewPoint.focus, zoom) }
-
-    fun DpOffset.toMercator(): WebMercatorCoordinates = WebMercatorCoordinates(
-        zoom,
-        (x - canvasSize.width / 2).value / tileScale + centerCoordinates.x,
-        (y - canvasSize.height / 2).value / tileScale + centerCoordinates.y,
-    )
-
-    /*
-     * Convert screen independent offset to GMC, adjusting for fractional zoom
-     */
-    fun DpOffset.toGeodetic() = WebMercatorProjection.toGeodetic(toMercator())
-
-    // Selection rectangle. If null - no selection
-    var selectRect by remember { mutableStateOf<Rect?>(null) }
-
-    @OptIn(ExperimentalComposeUiApi::class)
-    val canvasModifier = modifier.pointerInput(Unit) {
-        forEachGesture {
-            awaitPointerEventScope {
-                fun Offset.toDpOffset() = DpOffset(x.toDp(), y.toDp())
-
-                val event: PointerEvent = awaitPointerEvent()
-
-                event.changes.forEach { change ->
-                    val dragStart = change.position
-                    val dpPos = DpOffset(dragStart.x.toDp(), dragStart.y.toDp())
-
-                    //start selection
-                    if (event.buttons.isPrimaryPressed && event.keyboardModifiers.isShiftPressed) {
-                        selectRect = Rect(change.position, change.position)
-                    }
-
-                    drag(change.id) { dragChange ->
-                        val dragAmount = dragChange.position - dragChange.previousPosition
-                        val dpStart = DpOffset(
-                            dragChange.previousPosition.x.toDp(),
-                            dragChange.previousPosition.y.toDp()
-                        )
-                        val dpEnd = DpOffset(dragChange.position.x.toDp(), dragChange.position.y.toDp())
-
-                        //apply drag handle and check if it prohibits the drag even propagation
-                        if (
-                            !config.dragHandle.handle(
-                                event,
-                                MapViewPoint(dpStart.toGeodetic(), viewPoint.zoom),
-                                MapViewPoint(dpEnd.toGeodetic(), viewPoint.zoom)
-                            )
-                        ) {
-                            //clear selection just in case
-                            selectRect = null
-                            return@drag
-                        }
-
-                        if (event.buttons.isPrimaryPressed) {
-                            //Evaluating selection frame
-                            selectRect?.let { rect ->
-                                val offset = dragChange.position
-                                selectRect = Rect(
-                                    min(offset.x, rect.left),
-                                    min(offset.y, rect.top),
-                                    max(offset.x, rect.right),
-                                    max(offset.y, rect.bottom)
-                                )
-                                return@drag
-                            }
-
-                            config.onClick(MapViewPoint(dpPos.toGeodetic(), viewPoint.zoom), event)
-
-                            val newViewPoint = viewPoint.move(
-                                -dragAmount.x.toDp().value / tileScale,
-                                +dragAmount.y.toDp().value / tileScale
-                            )
-                            config.onViewChange(newViewPoint)
-                            viewPointInternal = newViewPoint
-                        }
-                    }
-
-                    // evaluate selection
-                    selectRect?.let { rect ->
-                        //Use selection override if it is defined
-                        val gmcBox = GmcRectangle(
-                            rect.topLeft.toDpOffset().toGeodetic(),
-                            rect.bottomRight.toDpOffset().toGeodetic()
-                        )
-                        config.onSelect(gmcBox)
-                        if (config.zoomOnSelect) {
-                            val newViewPoint = gmcBox.computeViewPoint(mapTileProvider).invoke(canvasSize)
-
-                            config.onViewChange(newViewPoint)
-                            viewPointInternal = newViewPoint
-                        }
-                        selectRect = null
-                    }
-                }
-            }
-        }
-    }.onPointerEvent(PointerEventType.Scroll) {
-        val change = it.changes.first()
-        val (xPos, yPos) = change.position
-        //compute invariant point of translation
-        val invariant = DpOffset(xPos.toDp(), yPos.toDp()).toGeodetic()
-        val newViewPoint = viewPoint.zoom(-change.scrollDelta.y.toDouble() * config.zoomSpeed, invariant)
-        config.onViewChange(newViewPoint)
-        viewPointInternal = newViewPoint
-    }.fillMaxSize()
-
-
-    // Load tiles asynchronously
-    LaunchedEffect(viewPoint, canvasSize) {
-        with(mapTileProvider) {
-            val indexRange = 0 until 2.0.pow(zoom).toInt()
-
-            val left = centerCoordinates.x - canvasSize.width.value / 2 / tileScale
-            val right = centerCoordinates.x + canvasSize.width.value / 2 / tileScale
-            val horizontalIndices: IntRange = (toIndex(left)..toIndex(right)).intersect(indexRange)
-
-            val top = (centerCoordinates.y + canvasSize.height.value / 2 / tileScale)
-            val bottom = (centerCoordinates.y - canvasSize.height.value / 2 / tileScale)
-            val verticalIndices: IntRange = (toIndex(bottom)..toIndex(top)).intersect(indexRange)
-
-            mapTiles.clear()
-
-            for (j in verticalIndices) {
-                for (i in horizontalIndices) {
-                    val id = TileId(zoom, i, j)
-                    try {
-                        //start all
-                        val deferred = loadTileAsync(id)
-                        //wait asynchronously for it to finish
-                        launch {
-                            mapTiles += deferred.await()
-                        }
-                    } catch (ex: Exception) {
-                        if (ex !is CancellationException) {
-                            //displaying the error is maps responsibility
-                            logger.error(ex) { "Failed to load tile with id=$id" }
-                        }
-                    }
-                }
-
-            }
-        }
-    }
-
-
-    Canvas(canvasModifier) {
-        fun WebMercatorCoordinates.toOffset(): Offset = Offset(
-            (canvasSize.width / 2 + (x.dp - centerCoordinates.x.dp) * tileScale.toFloat()).toPx(),
-            (canvasSize.height / 2 + (y.dp - centerCoordinates.y.dp) * tileScale.toFloat()).toPx()
-        )
-
-        //Convert GMC to offset in pixels (not DP), adjusting for zoom
-        fun GeodeticMapCoordinates.toOffset(): Offset = WebMercatorProjection.toMercator(this, zoom).toOffset()
-
-
-        fun DrawScope.drawFeature(zoom: Int, feature: MapFeature) {
-            when (feature) {
-                is MapFeatureSelector -> drawFeature(zoom, feature.selector(zoom))
-                is MapCircleFeature -> drawCircle(
-                    feature.color,
-                    feature.size,
-                    center = feature.center.toOffset()
-                )
-
-                is MapRectangleFeature -> drawRect(
-                    feature.color,
-                    topLeft = feature.center.toOffset() - Offset(
-                        feature.size.width.toPx() / 2,
-                        feature.size.height.toPx() / 2
-                    ),
-                    size = feature.size.toSize()
-                )
-
-                is MapLineFeature -> drawLine(feature.color, feature.a.toOffset(), feature.b.toOffset())
-                is MapArcFeature -> {
-                    val topLeft = feature.oval.topLeft.toOffset()
-                    val bottomRight = feature.oval.bottomRight.toOffset()
-
-                    val path = Path().apply {
-                        addArcRad(Rect(topLeft, bottomRight), feature.startAngle, feature.endAngle - feature.startAngle)
-                    }
-
-                    drawPath(path, color = feature.color, style = Stroke())
-
-                }
-
-                is MapBitmapImageFeature -> drawImage(feature.image, feature.position.toOffset())
-                is MapVectorImageFeature -> {
-                    val offset = feature.position.toOffset()
-                    val size = feature.size.toSize()
-                    translate(offset.x - size.width / 2, offset.y - size.height / 2) {
-                        with(feature.painter) {
-                            draw(size)
-                        }
-                    }
-                }
-
-                is MapTextFeature -> drawIntoCanvas { canvas ->
-                    val offset = feature.position.toOffset()
-                    canvas.nativeCanvas.drawString(
-                        feature.text,
-                        offset.x + 5,
-                        offset.y - 5,
-                        Font().apply(feature.fontConfig),
-                        feature.color.toPaint()
-                    )
-                }
-
-                is MapDrawFeature -> {
-                    val offset = feature.position.toOffset()
-                    translate(offset.x, offset.y) {
-                        feature.drawFeature(this)
-                    }
-                }
-
-                is MapFeatureGroup -> {
-                    feature.children.values.forEach {
-                        drawFeature(zoom, it)
-                    }
-                }
-
-                is MapPointsFeature -> {
-                    val points = feature.points.map { it.toOffset() }
-                    drawPoints(
-                        points = points,
-                        color = feature.color,
-                        strokeWidth = feature.stroke,
-                        pointMode = feature.pointMode
-                    )
-                }
-
-                else -> {
-                    logger.error { "Unrecognized feature type: ${feature::class}" }
-                }
-            }
-        }
-
-        if (canvasSize != size.toDpSize()) {
-            canvasSize = size.toDpSize()
-            logger.debug { "Recalculate canvas. Size: $size" }
-        }
-        clipRect {
-            val tileSize = IntSize(
-                ceil((mapTileProvider.tileSize.dp * tileScale.toFloat()).toPx()).toInt(),
-                ceil((mapTileProvider.tileSize.dp * tileScale.toFloat()).toPx()).toInt()
-            )
-            mapTiles.forEach { (id, image) ->
-                //converting back from tile index to screen offset
-                val offset = IntOffset(
-                    (canvasSize.width / 2 + (mapTileProvider.toCoordinate(id.i).dp - centerCoordinates.x.dp) * tileScale.toFloat()).roundToPx(),
-                    (canvasSize.height / 2 + (mapTileProvider.toCoordinate(id.j).dp - centerCoordinates.y.dp) * tileScale.toFloat()).roundToPx()
-                )
-                drawImage(
-                    image = image,
-                    dstOffset = offset,
-                    dstSize = tileSize
-                )
-            }
-            features.values.filter { zoom in it.zoomRange }.forEach { feature ->
-                drawFeature(zoom, feature)
-            }
-        }
-        selectRect?.let { rect ->
-            drawRect(
-                color = Color.Blue,
-                topLeft = rect.topLeft,
-                size = rect.size,
-                alpha = 0.5f,
-                style = Stroke(
-                    width = 2f,
-                    pathEffect = PathEffect.dashPathEffect(floatArrayOf(10f, 10f), 0f)
-                )
-            )
-        }
-    }
-}

maps-kt-compose/src/jvmMain/kotlin/center/sciprog/maps/compose/OpenStreetMapTileProvider.kt

@@ -1,11 +1,8 @@
 package center.sciprog.maps.compose
 
-import androidx.compose.ui.graphics.ImageBitmap
-import androidx.compose.ui.graphics.toComposeImageBitmap
 import io.ktor.client.HttpClient
 import io.ktor.client.request.get
 import io.ktor.client.statement.readBytes
-import io.ktor.utils.io.CancellationException
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Deferred
 import kotlinx.coroutines.Dispatchers
@@ -26,23 +23,24 @@ public class OpenStreetMapTileProvider(
     private val cacheDirectory: Path,
     parallelism: Int = 4,
     cacheCapacity: Int = 200,
+    private val osmBaseUrl: String = "https://tile.openstreetmap.org",
 ) : MapTileProvider {
     private val semaphore = Semaphore(parallelism)
-    private val cache = LruCache<TileId, Deferred<ImageBitmap>>(cacheCapacity)
+    private val cache = LruCache<TileId, Deferred<Image>>(cacheCapacity)
 
-    private fun TileId.osmUrl() = URL("https://tile.openstreetmap.org/${zoom}/${i}/${j}.png")
+    private fun TileId.osmUrl() = URL("$osmBaseUrl/${zoom}/${i}/${j}.png")
 
     private fun TileId.cacheFilePath() = cacheDirectory.resolve("${zoom}/${i}/${j}.png")
 
     /**
      * Download and cache the tile image
      */
-    private fun CoroutineScope.downloadImageAsync(id: TileId): Deferred<ImageBitmap> = async(Dispatchers.IO) {
+    private fun CoroutineScope.downloadImageAsync(id: TileId): Deferred<Image> = async(Dispatchers.IO) {
 
         id.cacheFilePath()?.let { path ->
             if (path.exists()) {
                 try {
-                    return@async Image.makeFromEncoded(path.readBytes()).toComposeImageBitmap()
+                    return@async Image.makeFromEncoded(path.readBytes())
                 } catch (ex: Exception) {
                     logger.debug { "Failed to load image from $path" }
                     path.deleteIfExists()
@@ -62,7 +60,7 @@ public class OpenStreetMapTileProvider(
                 path.writeBytes(byteArray)
             }
 
-            Image.makeFromEncoded(byteArray).toComposeImageBitmap()
+            Image.makeFromEncoded(byteArray)
         }
     }
 
@@ -71,21 +69,17 @@ public class OpenStreetMapTileProvider(
     ): Deferred<MapTile> {
 
         //start image download
-        val imageDeferred = cache.getOrPut(tileId) {
+        val imageDeferred: Deferred<Image> = cache.getOrPut(tileId) {
             downloadImageAsync(tileId)
         }
 
         //collect the result asynchronously
         return async {
-            val image: ImageBitmap = try {
+            val image: Image = runCatching { imageDeferred.await() }.onFailure {
-                imageDeferred.await()
+                logger.error(it) { "Failed to load tile image with id=$tileId" }
-            } catch (ex: Exception) {
                 cache.remove(tileId)
-                if (ex !is CancellationException) {
+            }.getOrThrow()
-                    logger.error(ex) { "Failed to load tile image with id=$tileId" }
+
-                }
-                throw ex
-            }
             MapTile(tileId, image)
         }
     }

maps-kt-compose/src/jvmMain/kotlin/center/sciprog/maps/compose/mapViewJvm.kt

@@ -0,0 +1,146 @@
+package center.sciprog.maps.compose
+
+import androidx.compose.foundation.Canvas
+import androidx.compose.runtime.*
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.PathEffect
+import androidx.compose.ui.graphics.drawscope.Stroke
+import androidx.compose.ui.graphics.drawscope.clipRect
+import androidx.compose.ui.graphics.painter.Painter
+import androidx.compose.ui.graphics.toArgb
+import androidx.compose.ui.graphics.toComposeImageBitmap
+import androidx.compose.ui.unit.IntOffset
+import androidx.compose.ui.unit.IntSize
+import androidx.compose.ui.unit.dp
+import center.sciprog.attributes.z
+import center.sciprog.maps.coordinates.Gmc
+import center.sciprog.maps.features.FeatureGroup
+import center.sciprog.maps.features.PainterFeature
+import center.sciprog.maps.features.drawFeature
+import center.sciprog.maps.features.zoomRange
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.supervisorScope
+import mu.KotlinLogging
+import org.jetbrains.skia.Image
+import org.jetbrains.skia.Paint
+import kotlin.math.ceil
+import kotlin.math.max
+import kotlin.math.min
+import kotlin.math.pow
+
+
+private fun Color.toPaint(): Paint = Paint().apply {
+    isAntiAlias = true
+    color = toArgb()
+}
+
+private fun IntRange.intersect(other: IntRange) = max(first, other.first)..min(last, other.last)
+
+private val logger = KotlinLogging.logger("MapView")
+
+/**
+ * A component that renders map and provides basic map manipulation capabilities
+ */
+@Composable
+public actual fun MapView(
+    viewScope: MapViewScope,
+    features: FeatureGroup<Gmc>,
+    modifier: Modifier,
+): Unit = with(viewScope) {
+    val mapTiles = remember(mapTileProvider) { mutableStateMapOf<TileId, Image>() }
+
+    // Load tiles asynchronously
+    LaunchedEffect(viewPoint, canvasSize) {
+        with(mapTileProvider) {
+            val indexRange = 0 until 2.0.pow(intZoom).toInt()
+
+            val left = centerCoordinates.x - canvasSize.width.value / 2 / tileScale
+            val right = centerCoordinates.x + canvasSize.width.value / 2 / tileScale
+            val horizontalIndices: IntRange = (toIndex(left)..toIndex(right)).intersect(indexRange)
+
+            val top = (centerCoordinates.y + canvasSize.height.value / 2 / tileScale)
+            val bottom = (centerCoordinates.y - canvasSize.height.value / 2 / tileScale)
+            val verticalIndices: IntRange = (toIndex(bottom)..toIndex(top)).intersect(indexRange)
+
+            for (j in verticalIndices) {
+                for (i in horizontalIndices) {
+                    val id = TileId(intZoom, i, j)
+                    //ensure that failed tiles do not fail the application
+                    supervisorScope {
+                        //start all
+                        val deferred = loadTileAsync(id)
+                        //wait asynchronously for it to finish
+                        launch {
+                            try {
+                                val tile = deferred.await()
+                                mapTiles[tile.id] = tile.image
+                            } catch (ex: Exception) {
+                                //displaying the error is maps responsibility
+                                logger.error(ex) { "Failed to load tile with id=$id" }
+                            }
+                        }
+                    }
+                    mapTiles.keys.filter {
+                        it.zoom != intZoom || it.j !in verticalIndices || it.i !in horizontalIndices
+                    }.forEach {
+                        mapTiles.remove(it)
+                    }
+                }
+            }
+        }
+    }
+    key(viewScope, features) {
+        val painterCache: Map<PainterFeature<Gmc>, Painter> =
+            features.features.filterIsInstance<PainterFeature<Gmc>>().associateWith { it.getPainter() }
+
+        Canvas(modifier = modifier.mapControls(viewScope, features)) {
+
+            if (canvasSize != size.toDpSize()) {
+                logger.debug { "Recalculate canvas. Size: $size" }
+                config.onCanvasSizeChange(canvasSize)
+                canvasSize = size.toDpSize()
+            }
+
+            clipRect {
+                val tileSize = IntSize(
+                    ceil((mapTileProvider.tileSize.dp * tileScale).toPx()).toInt(),
+                    ceil((mapTileProvider.tileSize.dp * tileScale).toPx()).toInt()
+                )
+                mapTiles.forEach { (id, image) ->
+                    //converting back from tile index to screen offset
+                    val offset = IntOffset(
+                        (canvasSize.width / 2 + (mapTileProvider.toCoordinate(id.i).dp - centerCoordinates.x.dp) * tileScale).roundToPx(),
+                        (canvasSize.height / 2 + (mapTileProvider.toCoordinate(id.j).dp - centerCoordinates.y.dp) * tileScale).roundToPx()
+                    )
+                    drawImage(
+                        image = image.toComposeImageBitmap(),
+                        dstOffset = offset,
+                        dstSize = tileSize
+                    )
+                }
+
+                features.featureMap.values.sortedBy { it.z }
+                    .filter { viewPoint.zoom in it.zoomRange }
+                    .forEach { feature ->
+                        drawFeature(viewScope, painterCache, feature)
+                    }
+            }
+
+            selectRect?.let { dpRect ->
+                val rect = dpRect.toRect()
+                drawRect(
+                    color = Color.Blue,
+                    topLeft = rect.topLeft,
+                    size = rect.size,
+                    alpha = 0.5f,
+                    style = Stroke(
+                        width = 2f,
+                        pathEffect = PathEffect.dashPathEffect(floatArrayOf(10f, 10f), 0f)
+                    )
+                )
+            }
+        }
+    }
+}
+

maps-kt-compose/src/jvmTest/kotlin/center/sciprog/maps/compose/OsmTileProviderTest.kt

@@ -0,0 +1,45 @@
+package center.sciprog.maps.compose
+
+import io.ktor.client.HttpClient
+import io.ktor.client.engine.cio.CIO
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.supervisorScope
+import kotlinx.coroutines.test.runTest
+import org.junit.jupiter.api.Test
+import java.nio.file.Files
+import kotlin.test.assertFails
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class OsmTileProviderTest {
+//    @get:Rule
+//    val rule = createComposeRule()
+
+
+    @Test
+    fun testCorrectOsm() = runTest {
+        val provider = OpenStreetMapTileProvider(HttpClient(CIO), Files.createTempDirectory("mapCache"))
+        val tileId = TileId(3, 1, 1)
+        with(provider) {
+            loadTileAsync(tileId).await()
+        }
+    }
+
+    @Test
+    fun testFailedOsm() = runTest {
+        val provider = OpenStreetMapTileProvider(
+            HttpClient(CIO),
+            Files.createTempDirectory("mapCache"),
+            osmBaseUrl = "https://tile.openstreetmap1.org"
+        )
+        val tileId = TileId(3, 1, 1)
+        supervisorScope {
+            with(provider) {
+                val deferred = loadTileAsync(tileId)
+                assertFails {
+                    deferred.await()
+                }
+            }
+        }
+    }
+
+}

maps-kt-core/README.md

@@ -0,0 +1,35 @@
+# Module kmath-core
+
+The core interfaces of KMath.
+
+ - [angles and distances](#) : Type-safe angle and distance measurements.
+ - [ellipsoid](#) : Ellipsoid geometry and distances
+ - [mercator](#) : Mercator and web-mercator projections
+
+
+## Artifact:
+
+The Maven coordinates of this project are `center.sciprog:maps-kt-core:0.2.2`.
+
+**Gradle Groovy:**
+```groovy
+repositories {
+    maven { url 'https://repo.kotlin.link' }
+    mavenCentral()
+}
+
+dependencies {
+    implementation 'center.sciprog:maps-kt-core:0.2.2'
+}
+```
+**Gradle Kotlin DSL:**
+```kotlin
+repositories {
+    maven("https://repo.kotlin.link")
+    mavenCentral()
+}
+
+dependencies {
+    implementation("center.sciprog:maps-kt-core:0.2.2")
+}
+```

maps-kt-core/api/maps-kt-core.api

@@ -0,0 +1,250 @@
+public final class center/sciprog/maps/coordinates/Distance : java/lang/Comparable {
+	public static final field Companion Lcenter/sciprog/maps/coordinates/Distance$Companion;
+	public static final synthetic fun box-impl (D)Lcenter/sciprog/maps/coordinates/Distance;
+	public synthetic fun compareTo (Ljava/lang/Object;)I
+	public fun compareTo-LPoRJxU (D)I
+	public static fun compareTo-LPoRJxU (DD)I
+	public fun equals (Ljava/lang/Object;)Z
+	public static fun equals-impl (DLjava/lang/Object;)Z
+	public static final fun equals-impl0 (DD)Z
+	public final fun getKilometers ()D
+	public fun hashCode ()I
+	public static fun hashCode-impl (D)I
+	public fun toString ()Ljava/lang/String;
+	public static fun toString-impl (D)Ljava/lang/String;
+	public final synthetic fun unbox-impl ()D
+}
+
+public final class center/sciprog/maps/coordinates/Distance$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
+	public static final field INSTANCE Lcenter/sciprog/maps/coordinates/Distance$$serializer;
+	public fun childSerializers ()[Lkotlinx/serialization/KSerializer;
+	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
+	public fun deserialize-h1Ihu8M (Lkotlinx/serialization/encoding/Decoder;)D
+	public fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
+	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
+	public fun serialize-xeUJnDc (Lkotlinx/serialization/encoding/Encoder;D)V
+	public fun typeParametersSerializers ()[Lkotlinx/serialization/KSerializer;
+}
+
+public final class center/sciprog/maps/coordinates/Distance$Companion {
+	public final fun serializer ()Lkotlinx/serialization/KSerializer;
+}
+
+public final class center/sciprog/maps/coordinates/DistanceKt {
+	public static final fun div-XO6jDg8 (DLjava/lang/Number;)D
+	public static final fun div-yHr8yDM (DD)D
+	public static final fun getKilometers (Ljava/lang/Number;)D
+	public static final fun getMeters (Ljava/lang/Number;)D
+	public static final fun getMeters-LPoRJxU (D)D
+	public static final fun minus-yHr8yDM (DD)D
+	public static final fun plus-yHr8yDM (DD)D
+	public static final fun times-XO6jDg8 (DLjava/lang/Number;)D
+}
+
+public final class center/sciprog/maps/coordinates/GeoEllipsoid {
+	public static final field Companion Lcenter/sciprog/maps/coordinates/GeoEllipsoid$Companion;
+	public synthetic fun <init> (DDLkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (ILcenter/sciprog/maps/coordinates/Distance;Lcenter/sciprog/maps/coordinates/Distance;DDDDLkotlinx/serialization/internal/SerializationConstructorMarker;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun getESquared ()D
+	public final fun getEccentricity ()D
+	public final fun getEquatorRadius-zipobaw ()D
+	public final fun getF ()D
+	public final fun getInverseF ()D
+	public final fun getPolarRadius-zipobaw ()D
+	public static final synthetic fun write$Self (Lcenter/sciprog/maps/coordinates/GeoEllipsoid;Lkotlinx/serialization/encoding/CompositeEncoder;Lkotlinx/serialization/descriptors/SerialDescriptor;)V
+}
+
+public final class center/sciprog/maps/coordinates/GeoEllipsoid$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
+	public static final field INSTANCE Lcenter/sciprog/maps/coordinates/GeoEllipsoid$$serializer;
+	public fun childSerializers ()[Lkotlinx/serialization/KSerializer;
+	public fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lcenter/sciprog/maps/coordinates/GeoEllipsoid;
+	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
+	public fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
+	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lcenter/sciprog/maps/coordinates/GeoEllipsoid;)V
+	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
+	public fun typeParametersSerializers ()[Lkotlinx/serialization/KSerializer;
+}
+
+public final class center/sciprog/maps/coordinates/GeoEllipsoid$Companion {
+	public final fun getGRS80 ()Lcenter/sciprog/maps/coordinates/GeoEllipsoid;
+	public final fun getSphere ()Lcenter/sciprog/maps/coordinates/GeoEllipsoid;
+	public final fun getWGS84 ()Lcenter/sciprog/maps/coordinates/GeoEllipsoid;
+	public final fun serializer ()Lkotlinx/serialization/KSerializer;
+}
+
+public final class center/sciprog/maps/coordinates/GeoEllipsoidKt {
+	public static final fun reducedRadius (Lcenter/sciprog/maps/coordinates/GeoEllipsoid;Lspace/kscience/kmath/geometry/Angle;)D
+}
+
+public final class center/sciprog/maps/coordinates/GeodeticMapCoordinates : space/kscience/kmath/geometry/Vector2D {
+	public static final field Companion Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates$Companion;
+	public synthetic fun <init> (ILspace/kscience/kmath/geometry/Angle;Lspace/kscience/kmath/geometry/Angle;Lcenter/sciprog/maps/coordinates/Distance;Lkotlinx/serialization/internal/SerializationConstructorMarker;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lspace/kscience/kmath/geometry/Angle;Lspace/kscience/kmath/geometry/Angle;Lcenter/sciprog/maps/coordinates/Distance;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lspace/kscience/kmath/geometry/Angle;Lspace/kscience/kmath/geometry/Angle;Lcenter/sciprog/maps/coordinates/Distance;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public fun equals (Ljava/lang/Object;)Z
+	public final fun getElevation-irfbOC8 ()Lcenter/sciprog/maps/coordinates/Distance;
+	public final fun getLatitude ()Lspace/kscience/kmath/geometry/Angle;
+	public final fun getLongitude ()Lspace/kscience/kmath/geometry/Angle;
+	public synthetic fun getX ()Ljava/lang/Object;
+	public fun getX ()Lspace/kscience/kmath/geometry/Angle;
+	public synthetic fun getY ()Ljava/lang/Object;
+	public fun getY ()Lspace/kscience/kmath/geometry/Angle;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+	public static final synthetic fun write$Self (Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;Lkotlinx/serialization/encoding/CompositeEncoder;Lkotlinx/serialization/descriptors/SerialDescriptor;)V
+}
+
+public final class center/sciprog/maps/coordinates/GeodeticMapCoordinates$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
+	public static final field INSTANCE Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates$$serializer;
+	public fun childSerializers ()[Lkotlinx/serialization/KSerializer;
+	public fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;
+	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
+	public fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
+	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;)V
+	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
+	public fun typeParametersSerializers ()[Lkotlinx/serialization/KSerializer;
+}
+
+public final class center/sciprog/maps/coordinates/GeodeticMapCoordinates$Companion {
+	public final fun normalized-8x94Bck (Lspace/kscience/kmath/geometry/Angle;Lspace/kscience/kmath/geometry/Angle;Lcenter/sciprog/maps/coordinates/Distance;)Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;
+	public static synthetic fun normalized-8x94Bck$default (Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates$Companion;Lspace/kscience/kmath/geometry/Angle;Lspace/kscience/kmath/geometry/Angle;Lcenter/sciprog/maps/coordinates/Distance;ILjava/lang/Object;)Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;
+	public final fun ofDegrees-8x94Bck (DDLcenter/sciprog/maps/coordinates/Distance;)Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;
+	public static synthetic fun ofDegrees-8x94Bck$default (Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates$Companion;DDLcenter/sciprog/maps/coordinates/Distance;ILjava/lang/Object;)Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;
+	public final fun ofRadians-8x94Bck (DDLcenter/sciprog/maps/coordinates/Distance;)Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;
+	public static synthetic fun ofRadians-8x94Bck$default (Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates$Companion;DDLcenter/sciprog/maps/coordinates/Distance;ILjava/lang/Object;)Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;
+	public final fun serializer ()Lkotlinx/serialization/KSerializer;
+}
+
+public final class center/sciprog/maps/coordinates/GmcCurve {
+	public synthetic fun <init> (Lcenter/sciprog/maps/coordinates/GmcPose;Lcenter/sciprog/maps/coordinates/GmcPose;DLkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun getBackward ()Lcenter/sciprog/maps/coordinates/GmcPose;
+	public final fun getDistance-zipobaw ()D
+	public final fun getForward ()Lcenter/sciprog/maps/coordinates/GmcPose;
+	public fun toString ()Ljava/lang/String;
+}
+
+public final class center/sciprog/maps/coordinates/GmcCurveKt {
+	public static final fun contains (Lkotlin/ranges/ClosedRange;Lspace/kscience/kmath/geometry/Angle;)Z
+	public static final fun curveBetween (Lcenter/sciprog/maps/coordinates/GeoEllipsoid;Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;D)Lcenter/sciprog/maps/coordinates/GmcCurve;
+	public static synthetic fun curveBetween$default (Lcenter/sciprog/maps/coordinates/GeoEllipsoid;Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;DILjava/lang/Object;)Lcenter/sciprog/maps/coordinates/GmcCurve;
+	public static final fun curveInDirection-EeP4nfk (Lcenter/sciprog/maps/coordinates/GeoEllipsoid;Lcenter/sciprog/maps/coordinates/GmcPose;DD)Lcenter/sciprog/maps/coordinates/GmcCurve;
+	public static synthetic fun curveInDirection-EeP4nfk$default (Lcenter/sciprog/maps/coordinates/GeoEllipsoid;Lcenter/sciprog/maps/coordinates/GmcPose;DDILjava/lang/Object;)Lcenter/sciprog/maps/coordinates/GmcCurve;
+	public static final fun meridianCurve-L4GImx8 (Lcenter/sciprog/maps/coordinates/GeoEllipsoid;Lspace/kscience/kmath/geometry/Angle;Lspace/kscience/kmath/geometry/Angle;Lspace/kscience/kmath/geometry/Angle;D)Lcenter/sciprog/maps/coordinates/GmcCurve;
+	public static synthetic fun meridianCurve-L4GImx8$default (Lcenter/sciprog/maps/coordinates/GeoEllipsoid;Lspace/kscience/kmath/geometry/Angle;Lspace/kscience/kmath/geometry/Angle;Lspace/kscience/kmath/geometry/Angle;DILjava/lang/Object;)Lcenter/sciprog/maps/coordinates/GmcCurve;
+	public static final fun parallelCurve (Lcenter/sciprog/maps/coordinates/GeoEllipsoid;Lspace/kscience/kmath/geometry/Angle;Lspace/kscience/kmath/geometry/Angle;Lspace/kscience/kmath/geometry/Angle;)Lcenter/sciprog/maps/coordinates/GmcCurve;
+	public static final fun reversed (Lcenter/sciprog/maps/coordinates/GmcCurve;)Lcenter/sciprog/maps/coordinates/GmcCurve;
+}
+
+public final class center/sciprog/maps/coordinates/GmcPose {
+	public static final field Companion Lcenter/sciprog/maps/coordinates/GmcPose$Companion;
+	public synthetic fun <init> (ILcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;Lspace/kscience/kmath/geometry/Angle;Lkotlinx/serialization/internal/SerializationConstructorMarker;)V
+	public fun <init> (Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;Lspace/kscience/kmath/geometry/Angle;)V
+	public final fun component1 ()Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;
+	public final fun component2 ()Lspace/kscience/kmath/geometry/Angle;
+	public final fun copy (Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;Lspace/kscience/kmath/geometry/Angle;)Lcenter/sciprog/maps/coordinates/GmcPose;
+	public static synthetic fun copy$default (Lcenter/sciprog/maps/coordinates/GmcPose;Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;Lspace/kscience/kmath/geometry/Angle;ILjava/lang/Object;)Lcenter/sciprog/maps/coordinates/GmcPose;
+	public fun equals (Ljava/lang/Object;)Z
+	public final fun getBearing ()Lspace/kscience/kmath/geometry/Angle;
+	public final fun getCoordinates ()Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;
+	public final fun getLatitude ()Lspace/kscience/kmath/geometry/Angle;
+	public final fun getLongitude ()Lspace/kscience/kmath/geometry/Angle;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+	public static final synthetic fun write$Self (Lcenter/sciprog/maps/coordinates/GmcPose;Lkotlinx/serialization/encoding/CompositeEncoder;Lkotlinx/serialization/descriptors/SerialDescriptor;)V
+}
+
+public final class center/sciprog/maps/coordinates/GmcPose$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
+	public static final field INSTANCE Lcenter/sciprog/maps/coordinates/GmcPose$$serializer;
+	public fun childSerializers ()[Lkotlinx/serialization/KSerializer;
+	public fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lcenter/sciprog/maps/coordinates/GmcPose;
+	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
+	public fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
+	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lcenter/sciprog/maps/coordinates/GmcPose;)V
+	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
+	public fun typeParametersSerializers ()[Lkotlinx/serialization/KSerializer;
+}
+
+public final class center/sciprog/maps/coordinates/GmcPose$Companion {
+	public final fun serializer ()Lkotlinx/serialization/KSerializer;
+}
+
+public final class center/sciprog/maps/coordinates/GmcPoseKt {
+	public static final fun reversed (Lcenter/sciprog/maps/coordinates/GmcPose;)Lcenter/sciprog/maps/coordinates/GmcPose;
+}
+
+public abstract interface class center/sciprog/maps/coordinates/MapProjection {
+	public static final field Companion Lcenter/sciprog/maps/coordinates/MapProjection$Companion;
+	public abstract fun toGeodetic (Ljava/lang/Object;)Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;
+	public abstract fun toProjection (Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;)Ljava/lang/Object;
+}
+
+public final class center/sciprog/maps/coordinates/MapProjection$Companion {
+	public final fun getEpsg3857 ()Lcenter/sciprog/maps/coordinates/MercatorProjection;
+}
+
+public class center/sciprog/maps/coordinates/MercatorProjection : center/sciprog/maps/coordinates/MapProjection {
+	public static final field Companion Lcenter/sciprog/maps/coordinates/MercatorProjection$Companion;
+	public fun <init> ()V
+	public synthetic fun <init> (ILspace/kscience/kmath/geometry/Angle;Lcenter/sciprog/maps/coordinates/GeoEllipsoid;Lkotlinx/serialization/internal/SerializationConstructorMarker;)V
+	public fun <init> (Lspace/kscience/kmath/geometry/Angle;Lcenter/sciprog/maps/coordinates/GeoEllipsoid;)V
+	public synthetic fun <init> (Lspace/kscience/kmath/geometry/Angle;Lcenter/sciprog/maps/coordinates/GeoEllipsoid;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun getBaseLongitude ()Lspace/kscience/kmath/geometry/Angle;
+	public final fun getEllipsoid ()Lcenter/sciprog/maps/coordinates/GeoEllipsoid;
+	public fun toGeodetic (Lcenter/sciprog/maps/coordinates/ProjectionCoordinates;)Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;
+	public synthetic fun toGeodetic (Ljava/lang/Object;)Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;
+	public fun toProjection (Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;)Lcenter/sciprog/maps/coordinates/ProjectionCoordinates;
+	public synthetic fun toProjection (Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;)Ljava/lang/Object;
+	public static final synthetic fun write$Self (Lcenter/sciprog/maps/coordinates/MercatorProjection;Lkotlinx/serialization/encoding/CompositeEncoder;Lkotlinx/serialization/descriptors/SerialDescriptor;)V
+}
+
+public final class center/sciprog/maps/coordinates/MercatorProjection$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
+	public static final field INSTANCE Lcenter/sciprog/maps/coordinates/MercatorProjection$$serializer;
+	public fun childSerializers ()[Lkotlinx/serialization/KSerializer;
+	public fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lcenter/sciprog/maps/coordinates/MercatorProjection;
+	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
+	public fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
+	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lcenter/sciprog/maps/coordinates/MercatorProjection;)V
+	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
+	public fun typeParametersSerializers ()[Lkotlinx/serialization/KSerializer;
+}
+
+public final class center/sciprog/maps/coordinates/MercatorProjection$Companion {
+	public final fun getMAXIMUM_LATITUDE ()Lspace/kscience/kmath/geometry/Angle;
+	public final fun serializer ()Lkotlinx/serialization/KSerializer;
+}
+
+public final class center/sciprog/maps/coordinates/ProjectionCoordinates {
+	public synthetic fun <init> (DDLkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1-zipobaw ()D
+	public final fun component2-zipobaw ()D
+	public final fun copy-yHr8yDM (DD)Lcenter/sciprog/maps/coordinates/ProjectionCoordinates;
+	public static synthetic fun copy-yHr8yDM$default (Lcenter/sciprog/maps/coordinates/ProjectionCoordinates;DDILjava/lang/Object;)Lcenter/sciprog/maps/coordinates/ProjectionCoordinates;
+	public fun equals (Ljava/lang/Object;)Z
+	public final fun getX-zipobaw ()D
+	public final fun getY-zipobaw ()D
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+}
+
+public final class center/sciprog/maps/coordinates/WebMercatorCoordinates {
+	public fun <init> (IFF)V
+	public final fun component1 ()I
+	public final fun component2 ()F
+	public final fun component3 ()F
+	public final fun copy (IFF)Lcenter/sciprog/maps/coordinates/WebMercatorCoordinates;
+	public static synthetic fun copy$default (Lcenter/sciprog/maps/coordinates/WebMercatorCoordinates;IFFILjava/lang/Object;)Lcenter/sciprog/maps/coordinates/WebMercatorCoordinates;
+	public fun equals (Ljava/lang/Object;)Z
+	public final fun getX ()F
+	public final fun getY ()F
+	public final fun getZoom ()I
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+}
+
+public final class center/sciprog/maps/coordinates/WebMercatorProjection {
+	public static final field INSTANCE Lcenter/sciprog/maps/coordinates/WebMercatorProjection;
+	public final fun scaleFactor (F)F
+	public final fun toGeodetic (Lcenter/sciprog/maps/coordinates/WebMercatorCoordinates;)Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;
+	public final fun toMercator (Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;I)Lcenter/sciprog/maps/coordinates/WebMercatorCoordinates;
+}
+

maps-kt-core/build.gradle.kts

@@ -1,26 +1,34 @@
 plugins {
-    kotlin("multiplatform")
+    id("space.kscience.gradle.mpp")
     `maven-publish`
 }
 
-val ktorVersion: String by rootProject.extra
+val kmathVersion: String by rootProject.extra
 
-kotlin {
+kscience{
-    explicitApi = org.jetbrains.kotlin.gradle.dsl.ExplicitApiMode.Warning
+    jvm()
-    jvm {
+    js()
-        compilations.all {
+    useSerialization()
-            kotlinOptions.jvmTarget = "11"
-        }
-    }
-    js(IR) {
-        browser()
-    }
 
-    sourceSets{
-        commonTest{
     dependencies{
-                implementation(kotlin("test"))
+        api(projects.trajectoryKt)
-            }
-        }
     }
 }
+
+readme {
+    description = "Core cartography, UI-agnostic"
+    maturity = space.kscience.gradle.Maturity.DEVELOPMENT
+    propertyByTemplate("artifact", rootProject.file("docs/templates/ARTIFACT-TEMPLATE.md"))
+
+    feature(
+        id = "angles and distances",
+    ) { "Type-safe angle and distance measurements." }
+
+    feature(
+        id = "ellipsoid",
+    ) { "Ellipsoid geometry and distances" }
+
+    feature(
+        id = "mercator",
+    ) { "Mercator and web-mercator projections" }
+}

maps-kt-core/docs/README-TEMPLATE.md

@@ -0,0 +1,7 @@
+# Module kmath-core
+
+The core interfaces of KMath.
+
+${features}
+
+${artifact}

maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/coordinates/Distance.kt

@@ -1,12 +1,17 @@
 package center.sciprog.maps.coordinates
 
+import kotlinx.serialization.Serializable
 import kotlin.jvm.JvmInline
 
+@Serializable
 @JvmInline
-public value class Distance(public val kilometers: Double) : Comparable<Distance> {
+public value class Distance internal constructor(public val kilometers: Double) : Comparable<Distance> {
     override fun compareTo(other: Distance): Int = this.kilometers.compareTo(other.kilometers)
 }
 
+public val Number.kilometers: Distance get() = Distance(toDouble())
+public val Number.meters: Distance get() = Distance(toDouble() / 1000)
+
 public operator fun Distance.div(other: Distance): Double = kilometers / other.kilometers
 
 public operator fun Distance.plus(other: Distance): Distance = Distance(kilometers + other.kilometers)

maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/coordinates/GeoEllipsoid.kt

@@ -1,10 +1,12 @@
 package center.sciprog.maps.coordinates
 
-import kotlin.math.acos
+import kotlinx.serialization.Serializable
+import space.kscience.kmath.geometry.Angle
+import space.kscience.kmath.geometry.tan
 import kotlin.math.pow
 import kotlin.math.sqrt
 
-
+@Serializable
 public class GeoEllipsoid(public val equatorRadius: Distance, public val polarRadius: Distance) {
 
     /**
@@ -17,8 +19,13 @@ public class GeoEllipsoid(public val equatorRadius: Distance, public val polarRa
      */
     public val inverseF: Double = equatorRadius.kilometers / (equatorRadius.kilometers - polarRadius.kilometers)
 
+    /**
+     *  Eccentricity squared
+     */
     public val eSquared: Double = 2 * f - f * f
 
+    public val eccentricity: Double = sqrt(eSquared)
+
     public companion object {
 
         public val WGS84: GeoEllipsoid = GeoEllipsoid(
@@ -48,7 +55,7 @@ public class GeoEllipsoid(public val equatorRadius: Distance, public val polarRa
 /**
  * A radius of circle normal to the axis of the ellipsoid at given latitude
  */
-internal fun GeoEllipsoid.reducedRadius(latitude: Angle): Distance {
+public fun GeoEllipsoid.reducedRadius(latitude: Angle): Distance {
     val reducedLatitudeTan = (1 - f) * tan(latitude)
     return equatorRadius / sqrt(1.0 + reducedLatitudeTan.pow(2))
 }

maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/coordinates/GeodeticMapCoordinates.kt

@@ -1,19 +1,31 @@
 package center.sciprog.maps.coordinates
 
-import kotlin.math.PI
+import kotlinx.serialization.Serializable
+import space.kscience.kmath.geometry.*
 
 /**
  * Geodetic coordinated
+ *
+ * @param elevation is optional
  */
+@Serializable
 public class GeodeticMapCoordinates(
     public val latitude: Angle,
-    longitude: Angle,
+    public val longitude: Angle,
-) {
+    public val elevation: Distance? = null,
-    public val longitude: Radians = longitude.radians.value.rem(PI / 2).radians
+) : Vector2D<Angle> {
-
     init {
-        require(latitude.radians.value in (-PI / 2)..(PI / 2)) { "Latitude $latitude is not in (-PI/2)..(PI/2)" }
+        require(latitude in (-Angle.piDiv2)..(Angle.piDiv2)) {
+            "Latitude $latitude is not in (-PI/2)..(PI/2)"
         }
+        require(longitude in (-Angle.pi..Angle.pi)) {
+            "Longitude $longitude is not in (-PI..PI) range"
+        }
+    }
+
+    override val x: Angle get() = longitude
+
+    override val y: Angle get() = latitude
 
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
@@ -21,10 +33,7 @@ public class GeodeticMapCoordinates(
 
         other as GeodeticMapCoordinates
 
-        if (latitude != other.latitude) return false
+        return latitude == other.latitude && longitude == other.longitude
-        if (longitude != other.longitude) return false
-
-        return true
     }
 
     override fun hashCode(): Int {
@@ -34,19 +43,34 @@ public class GeodeticMapCoordinates(
     }
 
     override fun toString(): String {
-        return "GMC(latitude=${latitude.degrees.value} deg, longitude=${longitude.degrees.value} deg)"
+        return "GMC(latitude=${latitude.degrees} deg, longitude=${longitude.degrees} deg)"
     }
 
 
     public companion object {
-        public fun ofRadians(latitude: Double, longitude: Double): GeodeticMapCoordinates =
+        public fun normalized(
-            GeodeticMapCoordinates(latitude.radians, longitude.radians)
+            latitude: Angle,
+            longitude: Angle,
+            elevation: Distance? = null,
+        ): GeodeticMapCoordinates = GeodeticMapCoordinates(
+            latitude.coerceIn(-Angle.piDiv2..Angle.piDiv2), longitude.normalized(Angle.zero), elevation
+        )
 
-        public fun ofDegrees(latitude: Double, longitude: Double): GeodeticMapCoordinates =
+        public fun ofRadians(
-            GeodeticMapCoordinates(latitude.degrees.radians, longitude.degrees.radians)
+            latitude: Double,
+            longitude: Double,
+            elevation: Distance? = null,
+        ): GeodeticMapCoordinates = normalized(latitude.radians, longitude.radians, elevation)
+
+        public fun ofDegrees(
+            latitude: Double,
+            longitude: Double,
+            elevation: Distance? = null,
+        ): GeodeticMapCoordinates = normalized(latitude.degrees, longitude.degrees, elevation)
     }
 }
 
+
 /**
  * Short name for GeodeticMapCoordinates
  */

maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/coordinates/GmcCurve.kt

@@ -1,8 +1,6 @@
 package center.sciprog.maps.coordinates
 
-import center.sciprog.maps.coordinates.Angle.Companion.pi
+import space.kscience.kmath.geometry.*
-import center.sciprog.maps.coordinates.Angle.Companion.piDiv2
-import center.sciprog.maps.coordinates.Angle.Companion.zero
 import kotlin.math.*
 
 /**
@@ -10,13 +8,22 @@ import kotlin.math.*
  * @param forward coordinate of a start point with forward direction
  * @param backward coordinate of an end point with backward direction
  */
-public class GmcCurve internal constructor(
+public class GmcCurve(
     public val forward: GmcPose,
     public val backward: GmcPose,
     public val distance: Distance,
-)
+){
+    override fun toString(): String {
+        return "GmcCurve(from: ${forward.coordinates}, to: ${backward.coordinates})"
+    }
+}
 
-public fun GmcCurve.reversed(): GmcCurve = GmcCurve(backward, forward, distance)
+public operator fun  ClosedRange<Radians>.contains(angle: Angle): Boolean = contains(angle.toRadians())
+
+/**
+ * Reverse direction and order of ends
+ */
+public fun GmcCurve.reversed(): GmcCurve = GmcCurve(backward.reversed(), forward.reversed(), distance)
 
 /**
  * Compute a curve alongside a meridian
@@ -27,8 +34,8 @@ public fun GeoEllipsoid.meridianCurve(
     toLatitude: Angle,
     step: Radians = 0.015.radians,
 ): GmcCurve {
-    require(fromLatitude in (-piDiv2)..(piDiv2)) { "Latitude must be in (-90, 90) degrees range" }
+    require(fromLatitude in (-Angle.piDiv2)..(Angle.piDiv2)) { "Latitude must be in (-90, 90) degrees range" }
-    require(toLatitude in (-piDiv2)..(piDiv2)) { "Latitude must be in (-90, 90) degrees range" }
+    require(toLatitude in (-Angle.piDiv2)..(Angle.piDiv2)) { "Latitude must be in (-90, 90) degrees range" }
 
     fun smallDistance(from: Radians, to: Radians): Distance = equatorRadius *
             (1 - eSquared) *
@@ -41,14 +48,14 @@ public fun GeoEllipsoid.meridianCurve(
     val integrateTo: Radians
 
     if (up) {
-        integrateFrom = fromLatitude.radians
+        integrateFrom = fromLatitude.toRadians()
-        integrateTo = toLatitude.radians
+        integrateTo = toLatitude.toRadians()
     } else {
-        integrateTo = fromLatitude.radians
+        integrateTo = fromLatitude.toRadians()
-        integrateFrom = toLatitude.radians
+        integrateFrom = toLatitude.toRadians()
     }
 
-    var current = integrateFrom
+    var current: Radians = integrateFrom
     var s = Distance(0.0)
     while (current < integrateTo) {
         val next = minOf(current + step, integrateTo)
@@ -57,8 +64,8 @@ public fun GeoEllipsoid.meridianCurve(
     }
 
     return GmcCurve(
-        forward = GmcPose(Gmc(fromLatitude, longitude), if (up) zero else pi),
+        forward = GmcPose(Gmc.normalized(fromLatitude, longitude), if (up) Angle.zero else Angle.pi),
-        backward = GmcPose(Gmc(toLatitude, longitude), if (up) pi else zero),
+        backward = GmcPose(Gmc.normalized(toLatitude, longitude), if (up) Angle.pi else Angle.zero),
         distance = s
     )
 }
@@ -67,12 +74,12 @@ public fun GeoEllipsoid.meridianCurve(
  * Compute a curve alongside a parallel
  */
 public fun GeoEllipsoid.parallelCurve(latitude: Angle, fromLongitude: Angle, toLongitude: Angle): GmcCurve {
-    require(latitude in (-piDiv2)..(piDiv2)) { "Latitude must be in (-90, 90) degrees range" }
+    require(latitude in (-Angle.piDiv2)..(Angle.piDiv2)) { "Latitude must be in (-90, 90) degrees range" }
     val right = toLongitude > fromLongitude
     return GmcCurve(
-        forward = GmcPose(Gmc(latitude, fromLongitude), if (right) piDiv2.radians else -piDiv2.radians),
+        forward = GmcPose(Gmc.normalized(latitude, fromLongitude), if (right) Angle.piDiv2 else -Angle.piDiv2),
-        backward = GmcPose(Gmc(latitude, toLongitude), if (right) -piDiv2.radians else piDiv2.radians),
+        backward = GmcPose(Gmc.normalized(latitude, toLongitude), if (right) -Angle.piDiv2 else Angle.piDiv2),
-        distance = reducedRadius(latitude) * abs((fromLongitude - toLongitude).radians.value)
+        distance = reducedRadius(latitude) * abs((fromLongitude - toLongitude).radians)
     )
 }
 
@@ -186,7 +193,7 @@ public fun GeoEllipsoid.curveInDirection(
     val L = lambda - (1 - C) * f * sinAlpha *
             (sigma.value + C * sinSigma * (cosSigmaM2 + C * cosSigma * (-1 + 2 * cos2SigmaM2)))
 
-    val endPoint = Gmc(phi2, L.radians)
+    val endPoint = Gmc.normalized(phi2, start.longitude + L.radians)
 
     // eq. 12
 
@@ -222,6 +229,8 @@ public fun GeoEllipsoid.curveBetween(start: Gmc, end: Gmc, precision: Double = 1
     val a = equatorRadius
     val b = polarRadius
 
+    if(start == end) error("Can't compute a curve because start and end coincide at $start")
+
     // get parameters as radians
     val phi1 = start.latitude
     val lambda1 = start.longitude
@@ -232,7 +241,7 @@ public fun GeoEllipsoid.curveBetween(start: Gmc, end: Gmc, precision: Double = 1
     val a2 = a.kilometers * a.kilometers
     val b2 = b.kilometers * b.kilometers
     val a2b2b2 = (a2 - b2) / b2
-    val omega: Radians = lambda2 - lambda1
+    val omega: Angle = lambda2 - lambda1
     val tanphi1: Double = tan(phi1)
     val tanU1 = (1.0 - f) * tanphi1
     val U1: Double = atan(tanU1)
@@ -249,14 +258,14 @@ public fun GeoEllipsoid.curveBetween(start: Gmc, end: Gmc, precision: Double = 1
     val cosU1cosU2 = cosU1 * cosU2
 
     // eq. 13
-    var lambda = omega
+    var lambda: Angle = omega
 
     // intermediates we'll need to compute 's'
     var A = 0.0
 
     var sigma = 0.0
     var deltasigma = 0.0
-    var lambda0: Radians
+    var lambda0: Angle
     var converged = false
     for (i in 0..19) {
         lambda0 = lambda
@@ -320,14 +329,13 @@ public fun GeoEllipsoid.curveBetween(start: Gmc, end: Gmc, precision: Double = 1
     // didn't converge? must be N/S
     if (!converged) {
         if (phi1 > phi2) {
-            alpha1 = pi.radians
+            alpha1 = Angle.pi.toRadians()
             alpha2 = 0.0.radians
         } else if (phi1 < phi2) {
             alpha1 = 0.0.radians
-            alpha2 = pi.radians
+            alpha2 = Angle.pi.toRadians()
         } else {
-            alpha1 = Double.NaN.radians
+            error("Start and end point coinside.")
-            alpha2 = Double.NaN.radians
         }
     } else {
         // eq. 20
@@ -340,7 +348,7 @@ public fun GeoEllipsoid.curveBetween(start: Gmc, end: Gmc, precision: Double = 1
         alpha2 = atan2(
             cosU1 * sin(lambda),
             -sinU1cosU2 + cosU1sinU2 * cos(lambda)
-        ).radians + pi
+        ).radians + Angle.pi
     }
     return GmcCurve(
         GmcPose(start, alpha1),

maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/coordinates/GmcPose.kt

@@ -1,8 +1,13 @@
 package center.sciprog.maps.coordinates
 
+import kotlinx.serialization.Serializable
+import space.kscience.kmath.geometry.Angle
+import space.kscience.kmath.geometry.normalized
+
 /**
  * A coordinate-bearing pair
  */
+@Serializable
 public data class GmcPose(val coordinates: GeodeticMapCoordinates, val bearing: Angle) {
     val latitude: Angle get() = coordinates.latitude
     val longitude: Angle get() = coordinates.longitude

maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/coordinates/GmcRectangle.kt

@@ -1,116 +0,0 @@
-package center.sciprog.maps.coordinates
-
-/**
- * A section of the map between two parallels and two meridians. The figure represents a square in a Mercator projection.
- * Params are two opposing "corners" of  quasi-square.
- *
- * Note that this is a rectangle only on a Mercator projection.
- */
-public data class GmcRectangle(
-    public val a: GeodeticMapCoordinates,
-    public val b: GeodeticMapCoordinates,
-) {
-    public companion object {
-
-        /**
-         * A quasi-square section.
-         */
-        public fun square(
-            center: GeodeticMapCoordinates,
-            height: Angle,
-            width: Angle,
-        ): GmcRectangle {
-            val a = GeodeticMapCoordinates(
-                center.latitude - (height / 2),
-                center.longitude - (width / 2)
-            )
-            val b = GeodeticMapCoordinates(
-                center.latitude + (height / 2),
-                center.longitude + (width / 2)
-            )
-            return GmcRectangle(a, b)
-        }
-
-        /**
-         * A quasi-square section. Note that latitudinal distance could be imprecise for large distances
-         */
-        public fun square(
-            center: GeodeticMapCoordinates,
-            height: Distance,
-            width: Distance,
-            ellipsoid: GeoEllipsoid = GeoEllipsoid.WGS84,
-        ): GmcRectangle {
-            val reducedRadius = ellipsoid.reducedRadius(center.latitude)
-            return square(center, (height / ellipsoid.polarRadius).radians, (width / reducedRadius).radians)
-        }
-    }
-}
-
-public val GmcRectangle.center: GeodeticMapCoordinates
-    get() = GeodeticMapCoordinates(
-        (a.latitude + b.latitude) / 2,
-        (a.longitude + b.longitude) / 2
-    )
-
-/**
- * Minimum longitude
- */
-public val GmcRectangle.left: Angle get() = minOf(a.longitude, b.longitude)
-
-/**
- * maximum longitude
- */
-public val GmcRectangle.right: Angle get() = maxOf(a.longitude, b.longitude)
-
-/**
- * Maximum latitude
- */
-public val GmcRectangle.top: Angle get() = maxOf(a.latitude, b.latitude)
-
-/**
- * Minimum latitude
- */
-public val GmcRectangle.bottom: Angle get() = minOf(a.latitude, b.latitude)
-
-public val GmcRectangle.longitudeDelta: Angle get() = abs(a.longitude - b.longitude)
-public val GmcRectangle.latitudeDelta: Angle get() = abs(a.latitude - b.latitude)
-
-public val GmcRectangle.topLeft: GeodeticMapCoordinates get() = GeodeticMapCoordinates(top, left)
-public val GmcRectangle.bottomRight: GeodeticMapCoordinates get() = GeodeticMapCoordinates(bottom, right)
-
-//public fun GmcRectangle.enlarge(
-//    top: Distance,
-//    bottom: Distance = top,
-//    left: Distance = top,
-//    right: Distance = left,
-//): GmcRectangle {
-//
-//}
-//
-//public fun GmcRectangle.enlarge(
-//    top: Angle,
-//    bottom: Angle = top,
-//    left: Angle = top,
-//    right: Angle = left,
-//): GmcRectangle {
-//
-//}
-
-/**
- * Check if coordinate is inside the box
- */
-public operator fun GmcRectangle.contains(coordinate: Gmc): Boolean =
-    coordinate.latitude in (bottom..top) && coordinate.longitude in (left..right)
-
-/**
- * Compute a minimal bounding box including all given boxes. Return null if collection is empty
- */
-public fun Collection<GmcRectangle>.wrapAll(): GmcRectangle? {
-    if (isEmpty()) return null
-    //TODO optimize computation
-    val minLat = minOf { it.bottom }
-    val maxLat = maxOf { it.top }
-    val minLong = minOf { it.left }
-    val maxLong = maxOf { it.right }
-    return GmcRectangle(GeodeticMapCoordinates(minLat, minLong), GeodeticMapCoordinates(maxLat, maxLong))
-}

maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/coordinates/MapViewPoint.kt

@@ -1,38 +0,0 @@
-package center.sciprog.maps.coordinates
-
-import kotlin.math.pow
-
-/**
- * Observable position on the map. Includes observation coordinate and [zoom] factor
- */
-public data class MapViewPoint(
-    val focus: GeodeticMapCoordinates,
-    val zoom: Double,
-) {
-    val scaleFactor: Double by lazy { WebMercatorProjection.scaleFactor(zoom) }
-}
-
-public fun MapViewPoint.move(delta: GeodeticMapCoordinates): MapViewPoint {
-    val newCoordinates = GeodeticMapCoordinates(
-        (focus.latitude + delta.latitude).coerceIn(
-            -MercatorProjection.MAXIMUM_LATITUDE,
-            MercatorProjection.MAXIMUM_LATITUDE
-        ),
-        focus.longitude + delta.longitude
-    )
-    return MapViewPoint(newCoordinates, zoom)
-}
-
-public fun MapViewPoint.zoom(
-    zoomDelta: Double,
-    invariant: GeodeticMapCoordinates = focus,
-): MapViewPoint = if (invariant == focus) {
-    copy(zoom = (zoom + zoomDelta).coerceIn(2.0, 18.0))
-} else {
-    val difScale = (1 - 2.0.pow(-zoomDelta))
-    val newCenter = GeodeticMapCoordinates(
-        focus.latitude + (invariant.latitude - focus.latitude) * difScale,
-        focus.longitude + (invariant.longitude - focus.longitude) * difScale
-    )
-    MapViewPoint(newCenter, (zoom + zoomDelta).coerceIn(2.0, 18.0))
-}

maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/coordinates/MercatorProjection.kt

@@ -5,54 +5,92 @@
 
 package center.sciprog.maps.coordinates
 
-import center.sciprog.maps.coordinates.Angle.Companion.pi
+import kotlinx.serialization.Serializable
-import kotlin.math.atan
+import space.kscience.kmath.geometry.*
-import kotlin.math.ln
+import kotlin.math.*
-import kotlin.math.sinh
+
+public data class ProjectionCoordinates(val x: Distance, val y: Distance)
+
+/**
+ * @param T the type of projection coordinates
+ */
+public interface MapProjection<T : Any> {
+    public fun toGeodetic(pc: T): GeodeticMapCoordinates
+    public fun toProjection(gmc: GeodeticMapCoordinates): T
+
+    public companion object {
+        public val epsg3857: MercatorProjection = MercatorProjection()
+    }
+}
 
-public data class MercatorCoordinates(val x: Distance, val y: Distance)
 
 /**
  * @param baseLongitude the longitude offset in radians
- * @param radius the average radius of the Earth
+ * @param ellipsoid - a [GeoEllipsoid] to be used for conversion
- * @param correctedRadius optional radius correction to account for ellipsoid model
  */
+@Serializable
 public open class MercatorProjection(
     public val baseLongitude: Angle = Angle.zero,
-    protected val radius: Distance = DEFAULT_EARTH_RADIUS,
+    public val ellipsoid: GeoEllipsoid = GeoEllipsoid.sphere,
-    private val correctedRadius: ((GeodeticMapCoordinates) -> Distance)? = null,
+) : MapProjection<ProjectionCoordinates> {
-) {
 
-    public fun toGeodetic(mc: MercatorCoordinates): GeodeticMapCoordinates {
+
-        val res = GeodeticMapCoordinates.ofRadians(
+    /**
-            atan(sinh(mc.y / radius)),
+     * Taken from https://github.com/geotools/geotools/blob/main/modules/library/referencing/src/main/java/org/geotools/referencing/operation/projection/Mercator.java#L164
-            baseLongitude.radians.value + (mc.x / radius),
+     */
-        )
+    private fun cphi2(ts: Double): Double {
-        return if (correctedRadius != null) {
+        val eccnth: Double = 0.5 * ellipsoid.eccentricity
-            val r = correctedRadius.invoke(res)
+        var phi: Double = PI / 2 - 2.0 * atan(ts)
+        for (i in 0 until 15) {
+            val con: Double = ellipsoid.eccentricity * sin(phi)
+            val dphi: Double = PI / 2 - 2.0 * atan(ts * ((1 - con) / (1 + con)).pow(eccnth)) - phi
+            phi += dphi
+            if (abs(dphi) <= 1e-10) {
+                return phi
+            }
+        }
+        error("Inverse mercator projection transformation failed to converge")
+    }
+
+
+    override fun toGeodetic(pc: ProjectionCoordinates): GeodeticMapCoordinates {
+        return if (ellipsoid === GeoEllipsoid.sphere) {
             GeodeticMapCoordinates.ofRadians(
-                atan(sinh(mc.y / r)),
+                atan(sinh(pc.y / ellipsoid.equatorRadius)),
-                baseLongitude.radians.value + mc.x / r,
+                baseLongitude.radians + (pc.x / ellipsoid.equatorRadius),
             )
         } else {
-            res
+            GeodeticMapCoordinates.ofRadians(
+                cphi2(exp(-(pc.y / ellipsoid.equatorRadius))),
+                baseLongitude.radians + (pc.x / ellipsoid.equatorRadius)
+            )
         }
     }
 
     /**
      * https://en.wikipedia.org/wiki/Web_Mercator_projection#Formulas
      */
-    public fun toMercator(gmc: GeodeticMapCoordinates): MercatorCoordinates {
+    override fun toProjection(gmc: GeodeticMapCoordinates): ProjectionCoordinates {
         require(abs(gmc.latitude) <= MAXIMUM_LATITUDE) { "Latitude exceeds the maximum latitude for mercator coordinates" }
-        val r: Distance = correctedRadius?.invoke(gmc) ?: radius
+        val e = sqrt(ellipsoid.eSquared)
-        return MercatorCoordinates(
+
-            x = r * (gmc.longitude - baseLongitude).radians.value,
+        return if (ellipsoid === GeoEllipsoid.sphere) {
-            y = r * ln(tan(pi / 4 + gmc.latitude / 2))
+            ProjectionCoordinates(
+                x = ellipsoid.equatorRadius * (gmc.longitude - baseLongitude).radians,
+                y = ellipsoid.equatorRadius * ln(tan(Angle.pi / 4 + gmc.latitude / 2))
+            )
+        } else {
+            val sinPhi = sin(gmc.latitude)
+            ProjectionCoordinates(
+                x = ellipsoid.equatorRadius * (gmc.longitude - baseLongitude).radians,
+                y = ellipsoid.equatorRadius * ln(
+                    tan(Angle.pi / 4 + gmc.latitude / 2) * ((1 - e * sinPhi) / (1 + e * sinPhi)).pow(e / 2)
+                )
             )
         }
+    }
 
-    public companion object : MercatorProjection(Angle.zero, Distance(6378.137)) {
+    public companion object {
         public val MAXIMUM_LATITUDE: Angle = 85.05113.degrees
-        public val DEFAULT_EARTH_RADIUS: Distance = radius
     }
 }

maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/coordinates/WebMercatorProjection.kt

@@ -5,19 +5,21 @@
 
 package center.sciprog.maps.coordinates
 
+import space.kscience.kmath.geometry.abs
+import space.kscience.kmath.geometry.radians
 import kotlin.math.*
 
-public data class WebMercatorCoordinates(val zoom: Int, val x: Double, val y: Double)
+public data class WebMercatorCoordinates(val zoom: Int, val x: Float, val y: Float)
 
 public object WebMercatorProjection {
 
     /**
      * Compute radians to projection coordinates ratio for given [zoom] factor
      */
-    public fun scaleFactor(zoom: Double): Double = 256.0 / 2 / PI * 2.0.pow(zoom)
+    public fun scaleFactor(zoom: Float): Float = (256.0 / 2 / PI * 2f.pow(zoom)).toFloat()
 
     public fun toGeodetic(mercator: WebMercatorCoordinates): GeodeticMapCoordinates {
-        val scaleFactor = scaleFactor(mercator.zoom.toDouble())
+        val scaleFactor = scaleFactor(mercator.zoom.toFloat())
         val longitude = mercator.x / scaleFactor - PI
         val latitude = (atan(exp(PI - mercator.y / scaleFactor)) - PI / 4) * 2
         return GeodeticMapCoordinates.ofRadians(latitude, longitude)
@@ -25,15 +27,17 @@ public object WebMercatorProjection {
 
     /**
      * https://en.wikipedia.org/wiki/Web_Mercator_projection#Formulas
+     *
+     * return null if gmc is outside of possible coordinate scope for WebMercator
      */
-    public fun toMercator(gmc: GeodeticMapCoordinates, zoom: Int): WebMercatorCoordinates {
+    public fun toMercator(gmc: GeodeticMapCoordinates, zoom: Int): WebMercatorCoordinates? {
-        require(abs(gmc.latitude) <= MercatorProjection.MAXIMUM_LATITUDE) { "Latitude exceeds the maximum latitude for mercator coordinates" }
+        if (abs(gmc.latitude) > MercatorProjection.MAXIMUM_LATITUDE) return null
 
-        val scaleFactor = scaleFactor(zoom.toDouble())
+        val scaleFactor = scaleFactor(zoom.toFloat())
         return WebMercatorCoordinates(
             zoom = zoom,
-            x = scaleFactor * (gmc.longitude.radians.value + PI),
+            x = scaleFactor * (gmc.longitude.radians + PI).toFloat(),
-            y = scaleFactor * (PI - ln(tan(PI / 4 + gmc.latitude.radians.value / 2)))
+            y = scaleFactor * (PI - ln(tan(PI / 4 + gmc.latitude.radians / 2))).toFloat()
         )
     }
 

maps-kt-core/src/commonMain/kotlin/center/sciprog/maps/coordinates/angles.kt

@@ -1,92 +0,0 @@
-/*
- * Copyright 2018-2021 KMath contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-
-package center.sciprog.maps.coordinates
-
-import kotlin.jvm.JvmInline
-import kotlin.math.PI
-
-// Taken from KMath dev version, to be used directly in the future
-
-
-public sealed interface Angle : Comparable<Angle> {
-    public val radians: Radians
-    public val degrees: Degrees
-
-    public operator fun plus(other: Angle): Angle
-    public operator fun minus(other: Angle): Angle
-
-    public operator fun times(other: Number): Angle
-    public operator fun div(other: Number): Angle
-    public operator fun div(other: Angle): Double
-    public operator fun unaryMinus(): Angle
-
-    public companion object {
-        public val zero: Angle = 0.radians
-        public val pi: Angle = PI.radians
-        public val piTimes2: Angle = (2 * PI).radians
-        public val piDiv2: Angle = (PI / 2).radians
-    }
-}
-
-/**
- * Type safe radians
- */
-@JvmInline
-public value class Radians(public val value: Double) : Angle {
-    override val radians: Radians
-        get() = this
-    override val degrees: Degrees
-        get() = Degrees(value * 180 / PI)
-
-    public override fun plus(other: Angle): Radians = Radians(value + other.radians.value)
-    public override fun minus(other: Angle): Radians = Radians(value - other.radians.value)
-
-    public override fun times(other: Number): Radians = Radians(value * other.toDouble())
-    public override fun div(other: Number): Radians = Radians(value / other.toDouble())
-    override fun div(other: Angle): Double = value / other.radians.value
-    public override fun unaryMinus(): Radians = Radians(-value)
-
-    override fun compareTo(other: Angle): Int = value.compareTo(other.radians.value)
-}
-
-public fun sin(angle: Angle): Double = kotlin.math.sin(angle.radians.value)
-public fun cos(angle: Angle): Double = kotlin.math.cos(angle.radians.value)
-public fun tan(angle: Angle): Double = kotlin.math.tan(angle.radians.value)
-
-public val Number.radians: Radians get() = Radians(toDouble())
-
-/**
- * Type safe degrees
- */
-@JvmInline
-public value class Degrees(public val value: Double) : Angle {
-    override val radians: Radians
-        get() = Radians(value * PI / 180)
-    override val degrees: Degrees
-        get() = this
-
-    public override fun plus(other: Angle): Degrees = Degrees(value + other.degrees.value)
-    public override fun minus(other: Angle): Degrees = Degrees(value - other.degrees.value)
-
-    public override fun times(other: Number): Degrees = Degrees(value * other.toDouble())
-    public override fun div(other: Number): Degrees = Degrees(value / other.toDouble())
-    override fun div(other: Angle): Double = value / other.degrees.value
-    public override fun unaryMinus(): Degrees = Degrees(-value)
-
-    override fun compareTo(other: Angle): Int = value.compareTo(other.degrees.value)
-}
-
-public val Number.degrees: Degrees get() = Degrees(toDouble())
-
-/**
- * Normalized angle to (0, 2PI) for radians or (0, 360) for degrees.
- */
-public fun Angle.normalized(): Angle = when (this) {
-    is Degrees -> (value + 180.0).rem(360.0).degrees
-    is Radians -> (value + PI).rem(PI * 2).radians
-}
-
-public fun abs(angle: Angle): Angle = if (angle < Angle.zero) -angle else angle

maps-kt-core/src/commonTest/kotlin/center/sciprog/maps/coordinates/DistanceTest.kt

@@ -1,13 +1,13 @@
 package center.sciprog.maps.coordinates
 
-import kotlin.test.Ignore
+import space.kscience.kmath.geometry.radians
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
 internal class DistanceTest {
     companion object {
-        val moscow = GMC.ofDegrees(55.76058287719673, 37.60358622841869)
+        val moscow = Gmc.ofDegrees(55.76058287719673, 37.60358622841869)
-        val spb = GMC.ofDegrees(59.926686023580444, 30.36038109122013)
+        val spb = Gmc.ofDegrees(59.926686023580444, 30.36038109122013)
     }
 
     @Test
@@ -21,6 +21,7 @@ internal class DistanceTest {
         val distance = curve.distance
 
         assertEquals(632.035426877, distance.kilometers, 0.0001)
+        assertEquals(-0.6947937116552751, curve.forward.bearing.radians, 0.0001)
     }
 
     @Test
@@ -29,6 +30,7 @@ internal class DistanceTest {
             GmcPose(moscow, (-0.6947937116552751).radians), Distance(632.035426877)
         )
 
-        assertEquals(spb.latitude.radians.value,curve.backward.latitude.radians.value, 0.0001)
+        assertEquals(spb.latitude.radians, curve.backward.latitude.radians, 0.0001)
+        assertEquals(spb.longitude.radians, curve.backward.longitude.radians, 0.0001)
     }
 }

maps-kt-core/src/commonTest/kotlin/center/sciprog/maps/coordinates/MercatorTest.kt

@@ -0,0 +1,29 @@
+package center.sciprog.maps.coordinates
+
+import space.kscience.kmath.geometry.degrees
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class MercatorTest {
+    @Test
+    fun sphereForwardBackward(){
+        val moscow = Gmc.ofDegrees(55.76058287719673, 37.60358622841869)
+        val mercator = MapProjection.epsg3857.toProjection(moscow)
+        //https://epsg.io/transform#s_srs=4326&t_srs=3857&x=37.6035862&y=55.7605829
+        assertEquals(4186.0120709, mercator.x.kilometers, 1e-4)
+        assertEquals(7510.9013658, mercator.y.kilometers, 1e-4)
+        val backwards = MapProjection.epsg3857.toGeodetic(mercator)
+        assertEquals(moscow.latitude.degrees, backwards.latitude.degrees, 1e-6)
+        assertEquals(moscow.longitude.degrees, backwards.longitude.degrees, 1e-6)
+    }
+
+    @Test
+    fun ellipseForwardBackward(){
+        val moscow = Gmc.ofDegrees(55.76058287719673, 37.60358622841869)
+        val projection = MercatorProjection(ellipsoid = GeoEllipsoid.WGS84)
+        val mercator = projection.toProjection(moscow)
+        val backwards = projection.toGeodetic(mercator)
+        assertEquals(moscow.latitude.degrees, backwards.latitude.degrees, 1e-6)
+        assertEquals(moscow.longitude.degrees, backwards.longitude.degrees, 1e-6)
+    }
+}

maps-kt-features/README.md

@@ -0,0 +1,32 @@
+# Module maps-kt-features
+
+
+
+## Usage
+
+## Artifact:
+
+The Maven coordinates of this project are `center.sciprog:maps-kt-features:0.2.2`.
+
+**Gradle Groovy:**
+```groovy
+repositories {
+    maven { url 'https://repo.kotlin.link' }
+    mavenCentral()
+}
+
+dependencies {
+    implementation 'center.sciprog:maps-kt-features:0.2.2'
+}
+```
+**Gradle Kotlin DSL:**
+```kotlin
+repositories {
+    maven("https://repo.kotlin.link")
+    mavenCentral()
+}
+
+dependencies {
+    implementation("center.sciprog:maps-kt-features:0.2.2")
+}
+```

maps-kt-features/api/maps-kt-features.api

@@ -0,0 +1,765 @@
+public abstract interface class center/sciprog/attributes/Attribute {
+}
+
+public abstract interface class center/sciprog/attributes/AttributeWithDefault : center/sciprog/attributes/Attribute {
+	public abstract fun getDefault ()Ljava/lang/Object;
+}
+
+public final class center/sciprog/attributes/Attributes {
+	public static final field Companion Lcenter/sciprog/attributes/Attributes$Companion;
+	public static final synthetic fun box-impl (Ljava/util/Map;)Lcenter/sciprog/attributes/Attributes;
+	public fun equals (Ljava/lang/Object;)Z
+	public static fun equals-impl (Ljava/util/Map;Ljava/lang/Object;)Z
+	public static final fun equals-impl0 (Ljava/util/Map;Ljava/util/Map;)Z
+	public static final fun get-impl (Ljava/util/Map;Lcenter/sciprog/attributes/Attribute;)Ljava/lang/Object;
+	public final fun getContent ()Ljava/util/Map;
+	public static final fun getKeys-impl (Ljava/util/Map;)Ljava/util/Set;
+	public fun hashCode ()I
+	public static fun hashCode-impl (Ljava/util/Map;)I
+	public fun toString ()Ljava/lang/String;
+	public static fun toString-impl (Ljava/util/Map;)Ljava/lang/String;
+	public final synthetic fun unbox-impl ()Ljava/util/Map;
+}
+
+public final class center/sciprog/attributes/Attributes$Companion {
+	public final fun getEMPTY-hlWAoAs ()Ljava/util/Map;
+}
+
+public final class center/sciprog/attributes/AttributesBuilder {
+	public static final field $stable I
+	public fun <init> ()V
+	public final fun add (Lcenter/sciprog/attributes/SetAttribute;Ljava/lang/Object;)V
+	public final fun build-hlWAoAs ()Ljava/util/Map;
+	public final fun from-xbryb2s (Ljava/util/Map;)V
+	public final fun get (Lcenter/sciprog/attributes/Attribute;)Ljava/lang/Object;
+	public final fun invoke (Lcenter/sciprog/attributes/Attribute;Ljava/lang/Object;)V
+	public final fun remove (Lcenter/sciprog/attributes/SetAttribute;Ljava/lang/Object;)V
+}
+
+public final class center/sciprog/attributes/AttributesBuilderKt {
+	public static final fun Attributes (Lkotlin/jvm/functions/Function1;)Ljava/util/Map;
+	public static final fun AttributesBuilder-xbryb2s (Ljava/util/Map;)Lcenter/sciprog/attributes/AttributesBuilder;
+}
+
+public final class center/sciprog/attributes/AttributesKt {
+	public static final fun Attributes (Lcenter/sciprog/attributes/Attribute;Ljava/lang/Object;)Ljava/util/Map;
+	public static final fun getOrDefault-hZ80nBk (Ljava/util/Map;Lcenter/sciprog/attributes/AttributeWithDefault;)Ljava/lang/Object;
+	public static final fun getZ (Lcenter/sciprog/maps/features/Feature;)F
+	public static final fun isEmpty-xbryb2s (Ljava/util/Map;)Z
+	public static final fun plus-0GKEh6s (Ljava/util/Map;Ljava/util/Map;)Ljava/util/Map;
+	public static final fun withAttribute-svNjpeE (Ljava/util/Map;Lcenter/sciprog/attributes/Attribute;Ljava/lang/Object;)Ljava/util/Map;
+	public static final fun withAttributeElement-svNjpeE (Ljava/util/Map;Lcenter/sciprog/attributes/SetAttribute;Ljava/lang/Object;)Ljava/util/Map;
+	public static final fun withoutAttributeElement-svNjpeE (Ljava/util/Map;Lcenter/sciprog/attributes/SetAttribute;Ljava/lang/Object;)Ljava/util/Map;
+}
+
+public final class center/sciprog/attributes/AttributesSerializer : kotlinx/serialization/KSerializer {
+	public static final field $stable I
+	public fun <init> (Ljava/util/Set;)V
+	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
+	public fun deserialize-7icwqAM (Lkotlinx/serialization/encoding/Decoder;)Ljava/util/Map;
+	public fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
+	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
+	public fun serialize-izrVrxc (Lkotlinx/serialization/encoding/Encoder;Ljava/util/Map;)V
+}
+
+public final class center/sciprog/attributes/NameAttribute : center/sciprog/attributes/SerializableAttribute {
+	public static final field $stable I
+	public static final field INSTANCE Lcenter/sciprog/attributes/NameAttribute;
+}
+
+public abstract class center/sciprog/attributes/SerializableAttribute : center/sciprog/attributes/Attribute {
+	public static final field $stable I
+	public fun <init> (Ljava/lang/String;Lkotlinx/serialization/KSerializer;)V
+	public final fun getSerialId ()Ljava/lang/String;
+	public final fun getSerializer ()Lkotlinx/serialization/KSerializer;
+	public fun toString ()Ljava/lang/String;
+}
+
+public abstract interface class center/sciprog/attributes/SetAttribute : center/sciprog/attributes/Attribute {
+}
+
+public final class center/sciprog/maps/compose/ClickGesturesKt {
+	public static final fun detectClicks (Landroidx/compose/ui/input/pointer/PointerInputScope;Lkotlin/jvm/functions/Function2;Lkotlin/jvm/functions/Function2;Lkotlin/jvm/functions/Function3;Lkotlin/jvm/functions/Function2;Lkotlin/coroutines/Continuation;)Ljava/lang/Object;
+	public static synthetic fun detectClicks$default (Landroidx/compose/ui/input/pointer/PointerInputScope;Lkotlin/jvm/functions/Function2;Lkotlin/jvm/functions/Function2;Lkotlin/jvm/functions/Function3;Lkotlin/jvm/functions/Function2;Lkotlin/coroutines/Continuation;ILjava/lang/Object;)Ljava/lang/Object;
+	public static final fun getPosition (Landroidx/compose/ui/input/pointer/PointerEvent;)J
+}
+
+public final class center/sciprog/maps/compose/MapControlsKt {
+	public static final fun mapControls (Landroidx/compose/ui/Modifier;Lcenter/sciprog/maps/features/CoordinateViewScope;Lcenter/sciprog/maps/features/FeatureGroup;)Landroidx/compose/ui/Modifier;
+}
+
+public final class center/sciprog/maps/features/AlphaAttribute : center/sciprog/attributes/Attribute {
+	public static final field $stable I
+	public static final field INSTANCE Lcenter/sciprog/maps/features/AlphaAttribute;
+}
+
+public final class center/sciprog/maps/features/ArcFeature : center/sciprog/maps/features/DraggableFeature {
+	public static final field $stable I
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/Rectangle;Lspace/kscience/kmath/geometry/Angle;Lspace/kscience/kmath/geometry/Angle;Ljava/util/Map;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/Rectangle;Lspace/kscience/kmath/geometry/Angle;Lspace/kscience/kmath/geometry/Angle;Ljava/util/Map;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1 ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun component2 ()Lcenter/sciprog/maps/features/Rectangle;
+	public final fun component3 ()Lspace/kscience/kmath/geometry/Angle;
+	public final fun component4 ()Lspace/kscience/kmath/geometry/Angle;
+	public final fun component5-hlWAoAs ()Ljava/util/Map;
+	public final fun copy-CqjioLk (Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/Rectangle;Lspace/kscience/kmath/geometry/Angle;Lspace/kscience/kmath/geometry/Angle;Ljava/util/Map;)Lcenter/sciprog/maps/features/ArcFeature;
+	public static synthetic fun copy-CqjioLk$default (Lcenter/sciprog/maps/features/ArcFeature;Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/Rectangle;Lspace/kscience/kmath/geometry/Angle;Lspace/kscience/kmath/geometry/Angle;Ljava/util/Map;ILjava/lang/Object;)Lcenter/sciprog/maps/features/ArcFeature;
+	public fun equals (Ljava/lang/Object;)Z
+	public final fun getArcLength ()Lspace/kscience/kmath/geometry/Angle;
+	public fun getAttributes-hlWAoAs ()Ljava/util/Map;
+	public fun getBoundingBox (F)Lcenter/sciprog/maps/features/Rectangle;
+	public final fun getOval ()Lcenter/sciprog/maps/features/Rectangle;
+	public fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun getStartAngle ()Lspace/kscience/kmath/geometry/Angle;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+	public fun withAttributes (Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/Feature;
+	public fun withCoordinates (Ljava/lang/Object;)Lcenter/sciprog/maps/features/Feature;
+}
+
+public abstract interface class center/sciprog/maps/features/Area {
+	public abstract fun contains (Ljava/lang/Object;)Z
+}
+
+public final class center/sciprog/maps/features/BitmapIconFeature : center/sciprog/maps/features/MarkerFeature {
+	public static final field $stable I
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;JLandroidx/compose/ui/graphics/ImageBitmap;Ljava/util/Map;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;JLandroidx/compose/ui/graphics/ImageBitmap;Ljava/util/Map;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1 ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun component2 ()Ljava/lang/Object;
+	public final fun component3-MYxV2XQ ()J
+	public final fun component4 ()Landroidx/compose/ui/graphics/ImageBitmap;
+	public final fun component5-hlWAoAs ()Ljava/util/Map;
+	public final fun copy-xcw5jm0 (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;JLandroidx/compose/ui/graphics/ImageBitmap;Ljava/util/Map;)Lcenter/sciprog/maps/features/BitmapIconFeature;
+	public static synthetic fun copy-xcw5jm0$default (Lcenter/sciprog/maps/features/BitmapIconFeature;Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;JLandroidx/compose/ui/graphics/ImageBitmap;Ljava/util/Map;ILjava/lang/Object;)Lcenter/sciprog/maps/features/BitmapIconFeature;
+	public fun equals (Ljava/lang/Object;)Z
+	public fun getAttributes-hlWAoAs ()Ljava/util/Map;
+	public fun getBoundingBox (F)Lcenter/sciprog/maps/features/Rectangle;
+	public fun getCenter ()Ljava/lang/Object;
+	public final fun getImage ()Landroidx/compose/ui/graphics/ImageBitmap;
+	public final fun getSize-MYxV2XQ ()J
+	public fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+	public fun withAttributes (Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/Feature;
+	public fun withCoordinates (Ljava/lang/Object;)Lcenter/sciprog/maps/features/Feature;
+}
+
+public final class center/sciprog/maps/features/CircleFeature : center/sciprog/maps/features/MarkerFeature {
+	public static final field $stable I
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;FLjava/util/Map;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;FLjava/util/Map;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1 ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun component2 ()Ljava/lang/Object;
+	public final fun component3-D9Ej5fM ()F
+	public final fun component4-hlWAoAs ()Ljava/util/Map;
+	public fun contains (Lcenter/sciprog/maps/features/ViewPoint;)Z
+	public final fun copy-eji0nfc (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;FLjava/util/Map;)Lcenter/sciprog/maps/features/CircleFeature;
+	public static synthetic fun copy-eji0nfc$default (Lcenter/sciprog/maps/features/CircleFeature;Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;FLjava/util/Map;ILjava/lang/Object;)Lcenter/sciprog/maps/features/CircleFeature;
+	public fun equals (Ljava/lang/Object;)Z
+	public fun getAttributes-hlWAoAs ()Ljava/util/Map;
+	public fun getBoundingBox (F)Lcenter/sciprog/maps/features/Rectangle;
+	public fun getCenter ()Ljava/lang/Object;
+	public final fun getRadius-D9Ej5fM ()F
+	public fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+	public fun withAttributes (Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/Feature;
+	public fun withCoordinates (Ljava/lang/Object;)Lcenter/sciprog/maps/features/Feature;
+}
+
+public final class center/sciprog/maps/features/ClickListenerAttribute : center/sciprog/attributes/SetAttribute {
+	public static final field $stable I
+	public static final field INSTANCE Lcenter/sciprog/maps/features/ClickListenerAttribute;
+}
+
+public final class center/sciprog/maps/features/ClickRadius : center/sciprog/attributes/Attribute {
+	public static final field $stable I
+	public static final field INSTANCE Lcenter/sciprog/maps/features/ClickRadius;
+}
+
+public final class center/sciprog/maps/features/ColorAttribute : center/sciprog/attributes/Attribute {
+	public static final field $stable I
+	public static final field INSTANCE Lcenter/sciprog/maps/features/ColorAttribute;
+}
+
+public final class center/sciprog/maps/features/CompositeFeaturesKt {
+	public static final fun draggableLine (Lcenter/sciprog/maps/features/FeatureGroup;Lcenter/sciprog/maps/features/FeatureRef;Lcenter/sciprog/maps/features/FeatureRef;Ljava/lang/String;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun draggableLine$default (Lcenter/sciprog/maps/features/FeatureGroup;Lcenter/sciprog/maps/features/FeatureRef;Lcenter/sciprog/maps/features/FeatureRef;Ljava/lang/String;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun draggableMultiLine (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/util/List;Ljava/lang/String;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun draggableMultiLine$default (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/util/List;Ljava/lang/String;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun draggableMultiLineFromPoints (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/util/List;Ljava/lang/String;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun draggableMultiLineFromPoints$default (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/util/List;Ljava/lang/String;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+}
+
+public abstract interface class center/sciprog/maps/features/CoordinateSpace {
+	public abstract fun Rectangle (Ljava/lang/Object;Ljava/lang/Object;)Lcenter/sciprog/maps/features/Rectangle;
+	public abstract fun Rectangle-Iw8sGQE (Ljava/lang/Object;FJ)Lcenter/sciprog/maps/features/Rectangle;
+	public abstract fun ViewPoint (Ljava/lang/Object;F)Lcenter/sciprog/maps/features/ViewPoint;
+	public fun distanceTo-ccRj1GA (Ljava/lang/Object;Ljava/lang/Object;F)F
+	public fun distanceToLine-DwT6o7Y (Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;F)F
+	public abstract fun getDefaultViewPoint ()Lcenter/sciprog/maps/features/ViewPoint;
+	public abstract fun isInsidePolygon (Ljava/lang/Object;Ljava/util/List;)Z
+	public abstract fun moveBy (Lcenter/sciprog/maps/features/ViewPoint;Ljava/lang/Object;)Lcenter/sciprog/maps/features/ViewPoint;
+	public abstract fun offsetTo-LQHvzoY (Ljava/lang/Object;Ljava/lang/Object;F)J
+	public abstract fun withCenter (Lcenter/sciprog/maps/features/Rectangle;Ljava/lang/Object;)Lcenter/sciprog/maps/features/Rectangle;
+	public abstract fun wrapPoints (Ljava/util/Collection;)Lcenter/sciprog/maps/features/Rectangle;
+	public abstract fun wrapRectangles (Ljava/util/Collection;)Lcenter/sciprog/maps/features/Rectangle;
+	public abstract fun zoomBy (Lcenter/sciprog/maps/features/ViewPoint;FLjava/lang/Object;)Lcenter/sciprog/maps/features/ViewPoint;
+	public static synthetic fun zoomBy$default (Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/ViewPoint;FLjava/lang/Object;ILjava/lang/Object;)Lcenter/sciprog/maps/features/ViewPoint;
+}
+
+public final class center/sciprog/maps/features/CoordinateSpaceKt {
+	public static final fun Rectangle-Iw8sGQE (Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/ViewPoint;J)Lcenter/sciprog/maps/features/Rectangle;
+}
+
+public abstract class center/sciprog/maps/features/CoordinateViewScope {
+	public static final field $stable I
+	public fun <init> (Lcenter/sciprog/maps/features/ViewConfig;)V
+	public abstract fun computeViewPoint (Lcenter/sciprog/maps/features/Rectangle;)Lcenter/sciprog/maps/features/ViewPoint;
+	public final fun getCanvasSize-MYxV2XQ ()J
+	public final fun getConfig ()Lcenter/sciprog/maps/features/ViewConfig;
+	public final fun getSelectRect ()Landroidx/compose/ui/unit/DpRect;
+	public abstract fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun getViewPoint ()Lcenter/sciprog/maps/features/ViewPoint;
+	public final fun getZoom ()F
+	public abstract fun moveBy-VpY3zN4 (Lcenter/sciprog/maps/features/ViewPoint;FF)Lcenter/sciprog/maps/features/ViewPoint;
+	public final fun setCanvasSize-EaSLcWc (J)V
+	public final fun setSelectRect (Landroidx/compose/ui/unit/DpRect;)V
+	public final fun setViewPoint (Lcenter/sciprog/maps/features/ViewPoint;)V
+	public final fun toCoordinates-3MmeM6k (JLandroidx/compose/ui/unit/Density;)Ljava/lang/Object;
+	public abstract fun toCoordinates-jo-Fl9I (J)Ljava/lang/Object;
+	public abstract fun toDpOffset-gVRvYmI (Ljava/lang/Object;)J
+	public abstract fun toDpRect (Lcenter/sciprog/maps/features/Rectangle;)Landroidx/compose/ui/unit/DpRect;
+	public final fun toOffset-dBAh8RU (Ljava/lang/Object;Landroidx/compose/ui/unit/Density;)J
+}
+
+public final class center/sciprog/maps/features/CoordinateViewScopeKt {
+	public static final fun getBottomRight (Landroidx/compose/ui/unit/DpRect;)J
+	public static final fun getTopLeft (Landroidx/compose/ui/unit/DpRect;)J
+}
+
+public abstract interface class center/sciprog/maps/features/DomainFeature : center/sciprog/maps/features/Feature {
+	public fun contains (Lcenter/sciprog/maps/features/ViewPoint;)Z
+}
+
+public abstract interface class center/sciprog/maps/features/DragHandle {
+	public static final field Companion Lcenter/sciprog/maps/features/DragHandle$Companion;
+	public abstract fun handle (Landroidx/compose/ui/input/pointer/PointerEvent;Lcenter/sciprog/maps/features/ViewPoint;Lcenter/sciprog/maps/features/ViewPoint;)Lcenter/sciprog/maps/features/DragResult;
+}
+
+public final class center/sciprog/maps/features/DragHandle$Companion {
+	public final fun bypass ()Lcenter/sciprog/maps/features/DragHandle;
+	public final fun combine ([Lcenter/sciprog/maps/features/DragHandle;)Lcenter/sciprog/maps/features/DragHandle;
+	public final fun withPrimaryButton (Lkotlin/jvm/functions/Function3;)Lcenter/sciprog/maps/features/DragHandle;
+}
+
+public abstract interface class center/sciprog/maps/features/DragListener {
+	public abstract fun handle (Landroidx/compose/ui/input/pointer/PointerEvent;Lcenter/sciprog/maps/features/ViewPoint;Lcenter/sciprog/maps/features/ViewPoint;)V
+}
+
+public final class center/sciprog/maps/features/DragListenerAttribute : center/sciprog/attributes/SetAttribute {
+	public static final field $stable I
+	public static final field INSTANCE Lcenter/sciprog/maps/features/DragListenerAttribute;
+}
+
+public final class center/sciprog/maps/features/DragResult {
+	public static final field $stable I
+	public fun <init> (Lcenter/sciprog/maps/features/ViewPoint;Z)V
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/ViewPoint;ZILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1 ()Lcenter/sciprog/maps/features/ViewPoint;
+	public final fun component2 ()Z
+	public final fun copy (Lcenter/sciprog/maps/features/ViewPoint;Z)Lcenter/sciprog/maps/features/DragResult;
+	public static synthetic fun copy$default (Lcenter/sciprog/maps/features/DragResult;Lcenter/sciprog/maps/features/ViewPoint;ZILjava/lang/Object;)Lcenter/sciprog/maps/features/DragResult;
+	public fun equals (Ljava/lang/Object;)Z
+	public final fun getHandleNext ()Z
+	public final fun getResult ()Lcenter/sciprog/maps/features/ViewPoint;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+}
+
+public final class center/sciprog/maps/features/DraggableAttribute : center/sciprog/attributes/Attribute {
+	public static final field $stable I
+	public static final field INSTANCE Lcenter/sciprog/maps/features/DraggableAttribute;
+}
+
+public abstract interface class center/sciprog/maps/features/DraggableFeature : center/sciprog/maps/features/DomainFeature {
+	public abstract fun withCoordinates (Ljava/lang/Object;)Lcenter/sciprog/maps/features/Feature;
+}
+
+public final class center/sciprog/maps/features/DrawFeature : center/sciprog/maps/features/DraggableFeature {
+	public static final field $stable I
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;Ljava/util/Map;Lkotlin/jvm/functions/Function1;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;Ljava/util/Map;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1 ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun component2 ()Ljava/lang/Object;
+	public final fun component3-hlWAoAs ()Ljava/util/Map;
+	public final fun component4 ()Lkotlin/jvm/functions/Function1;
+	public final fun copy-4xdkkFs (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;Ljava/util/Map;Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/DrawFeature;
+	public static synthetic fun copy-4xdkkFs$default (Lcenter/sciprog/maps/features/DrawFeature;Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;Ljava/util/Map;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lcenter/sciprog/maps/features/DrawFeature;
+	public fun equals (Ljava/lang/Object;)Z
+	public fun getAttributes-hlWAoAs ()Ljava/util/Map;
+	public fun getBoundingBox (F)Lcenter/sciprog/maps/features/Rectangle;
+	public final fun getDrawFeature ()Lkotlin/jvm/functions/Function1;
+	public final fun getPosition ()Ljava/lang/Object;
+	public fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+	public fun withAttributes (Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/Feature;
+	public fun withCoordinates (Ljava/lang/Object;)Lcenter/sciprog/maps/features/Feature;
+}
+
+public final class center/sciprog/maps/features/DrawFeatureKt {
+	public static final fun drawFeature (Landroidx/compose/ui/graphics/drawscope/DrawScope;Lcenter/sciprog/maps/features/CoordinateViewScope;Ljava/util/Map;Lcenter/sciprog/maps/features/Feature;)V
+}
+
+public abstract interface class center/sciprog/maps/features/Feature {
+	public abstract fun getAttributes-hlWAoAs ()Ljava/util/Map;
+	public abstract fun getBoundingBox (F)Lcenter/sciprog/maps/features/Rectangle;
+	public static synthetic fun getBoundingBox$default (Lcenter/sciprog/maps/features/Feature;FILjava/lang/Object;)Lcenter/sciprog/maps/features/Rectangle;
+	public abstract fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public abstract fun withAttributes (Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/Feature;
+}
+
+public final class center/sciprog/maps/features/FeatureGroup : center/sciprog/maps/features/CoordinateSpace, center/sciprog/maps/features/Feature {
+	public static final field $stable I
+	public static final field Companion Lcenter/sciprog/maps/features/FeatureGroup$Companion;
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Landroidx/compose/runtime/snapshots/SnapshotStateMap;Ljava/util/Map;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Landroidx/compose/runtime/snapshots/SnapshotStateMap;Ljava/util/Map;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public fun Rectangle (Ljava/lang/Object;Ljava/lang/Object;)Lcenter/sciprog/maps/features/Rectangle;
+	public fun Rectangle-Iw8sGQE (Ljava/lang/Object;FJ)Lcenter/sciprog/maps/features/Rectangle;
+	public fun ViewPoint (Ljava/lang/Object;F)Lcenter/sciprog/maps/features/ViewPoint;
+	public final fun component1 ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun component2 ()Landroidx/compose/runtime/snapshots/SnapshotStateMap;
+	public final fun component3-hlWAoAs ()Ljava/util/Map;
+	public final fun copy-EHyjM0Q (Lcenter/sciprog/maps/features/CoordinateSpace;Landroidx/compose/runtime/snapshots/SnapshotStateMap;Ljava/util/Map;)Lcenter/sciprog/maps/features/FeatureGroup;
+	public static synthetic fun copy-EHyjM0Q$default (Lcenter/sciprog/maps/features/FeatureGroup;Lcenter/sciprog/maps/features/CoordinateSpace;Landroidx/compose/runtime/snapshots/SnapshotStateMap;Ljava/util/Map;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureGroup;
+	public fun distanceTo-ccRj1GA (Ljava/lang/Object;Ljava/lang/Object;F)F
+	public fun distanceToLine-DwT6o7Y (Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;F)F
+	public fun equals (Ljava/lang/Object;)Z
+	public final fun feature (Ljava/lang/String;Lcenter/sciprog/maps/features/Feature;)Lcenter/sciprog/maps/features/FeatureRef;
+	public fun getAttributes-hlWAoAs ()Ljava/util/Map;
+	public fun getBoundingBox (F)Lcenter/sciprog/maps/features/Rectangle;
+	public fun getDefaultViewPoint ()Lcenter/sciprog/maps/features/ViewPoint;
+	public final fun getFeatureMap ()Landroidx/compose/runtime/snapshots/SnapshotStateMap;
+	public final fun getFeatures ()Ljava/util/Collection;
+	public fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public fun hashCode ()I
+	public fun isInsidePolygon (Ljava/lang/Object;Ljava/util/List;)Z
+	public fun moveBy (Lcenter/sciprog/maps/features/ViewPoint;Ljava/lang/Object;)Lcenter/sciprog/maps/features/ViewPoint;
+	public fun offsetTo-LQHvzoY (Ljava/lang/Object;Ljava/lang/Object;F)J
+	public final fun removeFeature (Ljava/lang/String;)V
+	public fun toString ()Ljava/lang/String;
+	public final fun visit (Lkotlin/jvm/functions/Function3;)V
+	public final fun visitUntil (Lkotlin/jvm/functions/Function3;)V
+	public fun withAttributes (Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/Feature;
+	public fun withCenter (Lcenter/sciprog/maps/features/Rectangle;Ljava/lang/Object;)Lcenter/sciprog/maps/features/Rectangle;
+	public fun wrapPoints (Ljava/util/Collection;)Lcenter/sciprog/maps/features/Rectangle;
+	public fun wrapRectangles (Ljava/util/Collection;)Lcenter/sciprog/maps/features/Rectangle;
+	public fun zoomBy (Lcenter/sciprog/maps/features/ViewPoint;FLjava/lang/Object;)Lcenter/sciprog/maps/features/ViewPoint;
+}
+
+public final class center/sciprog/maps/features/FeatureGroup$Companion {
+	public final fun build (Lcenter/sciprog/maps/features/CoordinateSpace;Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/FeatureGroup;
+	public static synthetic fun build$default (Lcenter/sciprog/maps/features/FeatureGroup$Companion;Lcenter/sciprog/maps/features/CoordinateSpace;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureGroup;
+	public final fun remember (Lcenter/sciprog/maps/features/CoordinateSpace;Lkotlin/jvm/functions/Function1;Landroidx/compose/runtime/Composer;II)Lcenter/sciprog/maps/features/FeatureGroup;
+}
+
+public final class center/sciprog/maps/features/FeatureGroupKt {
+	public static final fun Structure2D (IILkotlin/jvm/functions/Function1;)Lspace/kscience/kmath/nd/Structure2D;
+	public static final fun StructureND-qL90JFI ([ILkotlin/jvm/functions/Function1;)Lspace/kscience/kmath/nd/StructureND;
+	public static final fun arc-f9v9FWM (Lcenter/sciprog/maps/features/FeatureGroup;Lcenter/sciprog/maps/features/Rectangle;Lspace/kscience/kmath/geometry/Angle;Lspace/kscience/kmath/geometry/Angle;Ljava/util/Map;Ljava/lang/String;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun arc-f9v9FWM$default (Lcenter/sciprog/maps/features/FeatureGroup;Lcenter/sciprog/maps/features/Rectangle;Lspace/kscience/kmath/geometry/Angle;Lspace/kscience/kmath/geometry/Angle;Ljava/util/Map;Ljava/lang/String;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun circle-vJIlCZg (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/lang/Object;FLjava/util/Map;Ljava/lang/String;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun circle-vJIlCZg$default (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/lang/Object;FLjava/util/Map;Ljava/lang/String;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun draw-UqNt6FI (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/lang/Object;Ljava/util/Map;Ljava/lang/String;Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun draw-UqNt6FI$default (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/lang/Object;Ljava/util/Map;Ljava/lang/String;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun forEachWithAttribute (Lcenter/sciprog/maps/features/FeatureGroup;Lcenter/sciprog/attributes/Attribute;Lkotlin/jvm/functions/Function4;)V
+	public static final fun forEachWithAttributeUntil (Lcenter/sciprog/maps/features/FeatureGroup;Lcenter/sciprog/attributes/Attribute;Lkotlin/jvm/functions/Function4;)V
+	public static final fun getAttributes (Lcenter/sciprog/maps/features/FeatureRef;)Ljava/util/Map;
+	public static final fun group-WhaQnWU (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/util/Map;Ljava/lang/String;Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun group-WhaQnWU$default (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/util/Map;Ljava/lang/String;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun icon-Rwk-ljY (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/lang/Object;Landroidx/compose/ui/graphics/vector/ImageVector;JLjava/util/Map;Ljava/lang/String;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun icon-Rwk-ljY$default (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/lang/Object;Landroidx/compose/ui/graphics/vector/ImageVector;JLjava/util/Map;Ljava/lang/String;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun line-JCOR_Dk (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/lang/Object;Ljava/lang/Object;Ljava/util/Map;Ljava/lang/String;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun line-JCOR_Dk$default (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/lang/Object;Ljava/lang/Object;Ljava/util/Map;Ljava/lang/String;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun multiLine-4xdkkFs (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/util/List;Ljava/util/Map;Ljava/lang/String;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun multiLine-4xdkkFs$default (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/util/List;Ljava/util/Map;Ljava/lang/String;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun pixelMap-JCOR_Dk (Lcenter/sciprog/maps/features/FeatureGroup;Lcenter/sciprog/maps/features/Rectangle;Lspace/kscience/kmath/nd/Structure2D;Ljava/util/Map;Ljava/lang/String;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun pixelMap-JCOR_Dk$default (Lcenter/sciprog/maps/features/FeatureGroup;Lcenter/sciprog/maps/features/Rectangle;Lspace/kscience/kmath/nd/Structure2D;Ljava/util/Map;Ljava/lang/String;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun points-4xdkkFs (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/util/List;Ljava/util/Map;Ljava/lang/String;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun points-4xdkkFs$default (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/util/List;Ljava/util/Map;Ljava/lang/String;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun polygon-4xdkkFs (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/util/List;Ljava/util/Map;Ljava/lang/String;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun polygon-4xdkkFs$default (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/util/List;Ljava/util/Map;Ljava/lang/String;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun rectangle-H_bhbsI (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/lang/Object;JLjava/util/Map;Ljava/lang/String;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun rectangle-H_bhbsI$default (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/lang/Object;JLjava/util/Map;Ljava/lang/String;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun resolve (Lcenter/sciprog/maps/features/FeatureRef;)Lcenter/sciprog/maps/features/Feature;
+	public static final fun scalableImage-UqNt6FI (Lcenter/sciprog/maps/features/FeatureGroup;Lcenter/sciprog/maps/features/Rectangle;Ljava/util/Map;Ljava/lang/String;Lkotlin/jvm/functions/Function2;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun scalableImage-UqNt6FI$default (Lcenter/sciprog/maps/features/FeatureGroup;Lcenter/sciprog/maps/features/Rectangle;Ljava/util/Map;Ljava/lang/String;Lkotlin/jvm/functions/Function2;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun text-f9v9FWM (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/lang/Object;Ljava/lang/String;Lkotlin/jvm/functions/Function1;Ljava/util/Map;Ljava/lang/String;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun text-f9v9FWM$default (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/lang/Object;Ljava/lang/String;Lkotlin/jvm/functions/Function1;Ljava/util/Map;Ljava/lang/String;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+}
+
+public final class center/sciprog/maps/features/FeatureKt {
+	public static final fun computeBoundingBox (Ljava/lang/Iterable;Lcenter/sciprog/maps/features/CoordinateSpace;F)Lcenter/sciprog/maps/features/Rectangle;
+	public static final fun getColor (Lcenter/sciprog/maps/features/Feature;)Landroidx/compose/ui/graphics/Color;
+	public static final fun getName (Lcenter/sciprog/maps/features/Feature;)Ljava/lang/String;
+	public static final fun getZoomRange (Lcenter/sciprog/maps/features/Feature;)Lkotlin/ranges/ClosedFloatingPointRange;
+}
+
+public final class center/sciprog/maps/features/FeatureRef {
+	public static final field $stable I
+	public fun <init> (Ljava/lang/String;Lcenter/sciprog/maps/features/FeatureGroup;)V
+	public final fun getId ()Ljava/lang/String;
+	public final fun getParent ()Lcenter/sciprog/maps/features/FeatureGroup;
+}
+
+public final class center/sciprog/maps/features/FeatureSelector : center/sciprog/maps/features/Feature {
+	public static final field $stable I
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/util/Map;Lkotlin/jvm/functions/Function1;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/util/Map;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1 ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun component2-hlWAoAs ()Ljava/util/Map;
+	public final fun component3 ()Lkotlin/jvm/functions/Function1;
+	public final fun copy-I8jStn0 (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/util/Map;Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/FeatureSelector;
+	public static synthetic fun copy-I8jStn0$default (Lcenter/sciprog/maps/features/FeatureSelector;Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/util/Map;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureSelector;
+	public fun equals (Ljava/lang/Object;)Z
+	public fun getAttributes-hlWAoAs ()Ljava/util/Map;
+	public fun getBoundingBox (F)Lcenter/sciprog/maps/features/Rectangle;
+	public final fun getSelector ()Lkotlin/jvm/functions/Function1;
+	public fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+	public fun withAttributes (Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/Feature;
+}
+
+public final class center/sciprog/maps/features/HoverListenerAttribute : center/sciprog/attributes/SetAttribute {
+	public static final field $stable I
+	public static final field INSTANCE Lcenter/sciprog/maps/features/HoverListenerAttribute;
+}
+
+public final class center/sciprog/maps/features/LineFeature : center/sciprog/maps/features/DomainFeature, center/sciprog/maps/features/LineSegmentFeature {
+	public static final field $stable I
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;Ljava/lang/Object;Ljava/util/Map;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;Ljava/lang/Object;Ljava/util/Map;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1 ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun component2 ()Ljava/lang/Object;
+	public final fun component3 ()Ljava/lang/Object;
+	public final fun component4-hlWAoAs ()Ljava/util/Map;
+	public fun contains (Lcenter/sciprog/maps/features/ViewPoint;)Z
+	public final fun copy-a7qfu0U (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;Ljava/lang/Object;Ljava/util/Map;)Lcenter/sciprog/maps/features/LineFeature;
+	public static synthetic fun copy-a7qfu0U$default (Lcenter/sciprog/maps/features/LineFeature;Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;Ljava/lang/Object;Ljava/util/Map;ILjava/lang/Object;)Lcenter/sciprog/maps/features/LineFeature;
+	public fun equals (Ljava/lang/Object;)Z
+	public final fun getA ()Ljava/lang/Object;
+	public fun getAttributes-hlWAoAs ()Ljava/util/Map;
+	public final fun getB ()Ljava/lang/Object;
+	public fun getBoundingBox (F)Lcenter/sciprog/maps/features/Rectangle;
+	public final fun getCenter ()Ljava/lang/Object;
+	public fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+	public fun withAttributes (Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/Feature;
+}
+
+public abstract interface class center/sciprog/maps/features/LineSegmentFeature : center/sciprog/maps/features/Feature {
+}
+
+public final class center/sciprog/maps/features/MapFeatureAttributesKt {
+	public static final fun color-4WTKRHQ (Lcenter/sciprog/maps/features/FeatureRef;J)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun draggable (Lcenter/sciprog/maps/features/FeatureRef;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function3;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun draggable$default (Lcenter/sciprog/maps/features/FeatureRef;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function3;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun modifyAttribute (Lcenter/sciprog/maps/features/FeatureRef;Lcenter/sciprog/attributes/Attribute;Ljava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun modifyAttributes (Lcenter/sciprog/maps/features/FeatureRef;Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun onClick (Lcenter/sciprog/maps/features/FeatureRef;Landroidx/compose/foundation/PointerMatcher;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function2;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun onClick (Lcenter/sciprog/maps/features/FeatureRef;Lkotlin/jvm/functions/Function2;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun onClick$default (Lcenter/sciprog/maps/features/FeatureRef;Landroidx/compose/foundation/PointerMatcher;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function2;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun onDrag (Lcenter/sciprog/maps/features/FeatureRef;Lkotlin/jvm/functions/Function3;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun onHover (Lcenter/sciprog/maps/features/FeatureRef;Lkotlin/jvm/functions/Function2;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun pathEffect (Lcenter/sciprog/maps/features/FeatureRef;Landroidx/compose/ui/graphics/PathEffect;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun stroke (Lcenter/sciprog/maps/features/FeatureRef;F)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun zoomRange (Lcenter/sciprog/maps/features/FeatureRef;Lkotlin/ranges/ClosedFloatingPointRange;)Lcenter/sciprog/maps/features/FeatureRef;
+}
+
+public abstract interface class center/sciprog/maps/features/MarkerFeature : center/sciprog/maps/features/DraggableFeature {
+	public abstract fun getCenter ()Ljava/lang/Object;
+}
+
+public abstract interface class center/sciprog/maps/features/MouseListener {
+	public static final field Companion Lcenter/sciprog/maps/features/MouseListener$Companion;
+	public abstract fun handle (Landroidx/compose/ui/input/pointer/PointerEvent;Lcenter/sciprog/maps/features/ViewPoint;)V
+}
+
+public final class center/sciprog/maps/features/MouseListener$Companion {
+	public final fun withPrimaryButton (Lkotlin/jvm/functions/Function2;)Lcenter/sciprog/maps/features/MouseListener;
+}
+
+public final class center/sciprog/maps/features/MultiLineFeature : center/sciprog/maps/features/DomainFeature, center/sciprog/maps/features/LineSegmentFeature {
+	public static final field $stable I
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/util/List;Ljava/util/Map;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/util/List;Ljava/util/Map;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1 ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun component2 ()Ljava/util/List;
+	public final fun component3-hlWAoAs ()Ljava/util/Map;
+	public fun contains (Lcenter/sciprog/maps/features/ViewPoint;)Z
+	public final fun copy-EHyjM0Q (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/util/List;Ljava/util/Map;)Lcenter/sciprog/maps/features/MultiLineFeature;
+	public static synthetic fun copy-EHyjM0Q$default (Lcenter/sciprog/maps/features/MultiLineFeature;Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/util/List;Ljava/util/Map;ILjava/lang/Object;)Lcenter/sciprog/maps/features/MultiLineFeature;
+	public fun equals (Ljava/lang/Object;)Z
+	public fun getAttributes-hlWAoAs ()Ljava/util/Map;
+	public fun getBoundingBox (F)Lcenter/sciprog/maps/features/Rectangle;
+	public final fun getPoints ()Ljava/util/List;
+	public fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+	public fun withAttributes (Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/Feature;
+}
+
+public abstract interface class center/sciprog/maps/features/PainterFeature : center/sciprog/maps/features/Feature {
+	public abstract fun getPainter (Landroidx/compose/runtime/Composer;I)Landroidx/compose/ui/graphics/painter/Painter;
+}
+
+public final class center/sciprog/maps/features/PathEffectAttribute : center/sciprog/attributes/Attribute {
+	public static final field $stable I
+	public static final field INSTANCE Lcenter/sciprog/maps/features/PathEffectAttribute;
+}
+
+public final class center/sciprog/maps/features/PathFeature : center/sciprog/maps/features/DraggableFeature {
+	public static final field $stable I
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/Rectangle;Landroidx/compose/ui/graphics/Path;Landroidx/compose/ui/graphics/Brush;Landroidx/compose/ui/graphics/drawscope/DrawStyle;Landroidx/compose/ui/geometry/Rect;Ljava/util/Map;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/Rectangle;Landroidx/compose/ui/graphics/Path;Landroidx/compose/ui/graphics/Brush;Landroidx/compose/ui/graphics/drawscope/DrawStyle;Landroidx/compose/ui/geometry/Rect;Ljava/util/Map;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1 ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun component2 ()Lcenter/sciprog/maps/features/Rectangle;
+	public final fun component3 ()Landroidx/compose/ui/graphics/Path;
+	public final fun component4 ()Landroidx/compose/ui/graphics/Brush;
+	public final fun component5 ()Landroidx/compose/ui/graphics/drawscope/DrawStyle;
+	public final fun component6 ()Landroidx/compose/ui/geometry/Rect;
+	public final fun component7-hlWAoAs ()Ljava/util/Map;
+	public final fun copy-mDmFKLY (Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/Rectangle;Landroidx/compose/ui/graphics/Path;Landroidx/compose/ui/graphics/Brush;Landroidx/compose/ui/graphics/drawscope/DrawStyle;Landroidx/compose/ui/geometry/Rect;Ljava/util/Map;)Lcenter/sciprog/maps/features/PathFeature;
+	public static synthetic fun copy-mDmFKLY$default (Lcenter/sciprog/maps/features/PathFeature;Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/Rectangle;Landroidx/compose/ui/graphics/Path;Landroidx/compose/ui/graphics/Brush;Landroidx/compose/ui/graphics/drawscope/DrawStyle;Landroidx/compose/ui/geometry/Rect;Ljava/util/Map;ILjava/lang/Object;)Lcenter/sciprog/maps/features/PathFeature;
+	public fun equals (Ljava/lang/Object;)Z
+	public fun getAttributes-hlWAoAs ()Ljava/util/Map;
+	public fun getBoundingBox (F)Lcenter/sciprog/maps/features/Rectangle;
+	public final fun getBrush ()Landroidx/compose/ui/graphics/Brush;
+	public final fun getPath ()Landroidx/compose/ui/graphics/Path;
+	public final fun getRectangle ()Lcenter/sciprog/maps/features/Rectangle;
+	public fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun getStyle ()Landroidx/compose/ui/graphics/drawscope/DrawStyle;
+	public final fun getTargetRect ()Landroidx/compose/ui/geometry/Rect;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+	public fun withAttributes (Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/Feature;
+	public fun withCoordinates (Ljava/lang/Object;)Lcenter/sciprog/maps/features/Feature;
+}
+
+public final class center/sciprog/maps/features/PixelMapFeature : center/sciprog/maps/features/Feature {
+	public static final field $stable I
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/Rectangle;Lspace/kscience/kmath/nd/Structure2D;Ljava/util/Map;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/Rectangle;Lspace/kscience/kmath/nd/Structure2D;Ljava/util/Map;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1 ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun component2 ()Lcenter/sciprog/maps/features/Rectangle;
+	public final fun component3 ()Lspace/kscience/kmath/nd/Structure2D;
+	public final fun component4-hlWAoAs ()Ljava/util/Map;
+	public final fun copy-a7qfu0U (Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/Rectangle;Lspace/kscience/kmath/nd/Structure2D;Ljava/util/Map;)Lcenter/sciprog/maps/features/PixelMapFeature;
+	public static synthetic fun copy-a7qfu0U$default (Lcenter/sciprog/maps/features/PixelMapFeature;Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/Rectangle;Lspace/kscience/kmath/nd/Structure2D;Ljava/util/Map;ILjava/lang/Object;)Lcenter/sciprog/maps/features/PixelMapFeature;
+	public fun equals (Ljava/lang/Object;)Z
+	public fun getAttributes-hlWAoAs ()Ljava/util/Map;
+	public fun getBoundingBox (F)Lcenter/sciprog/maps/features/Rectangle;
+	public final fun getPixelMap ()Lspace/kscience/kmath/nd/Structure2D;
+	public final fun getRectangle ()Lcenter/sciprog/maps/features/Rectangle;
+	public fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+	public fun withAttributes (Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/Feature;
+}
+
+public final class center/sciprog/maps/features/PointsFeature : center/sciprog/maps/features/Feature {
+	public static final field $stable I
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/util/List;Ljava/util/Map;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/util/List;Ljava/util/Map;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1 ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun component2 ()Ljava/util/List;
+	public final fun component3-hlWAoAs ()Ljava/util/Map;
+	public final fun copy-EHyjM0Q (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/util/List;Ljava/util/Map;)Lcenter/sciprog/maps/features/PointsFeature;
+	public static synthetic fun copy-EHyjM0Q$default (Lcenter/sciprog/maps/features/PointsFeature;Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/util/List;Ljava/util/Map;ILjava/lang/Object;)Lcenter/sciprog/maps/features/PointsFeature;
+	public fun equals (Ljava/lang/Object;)Z
+	public fun getAttributes-hlWAoAs ()Ljava/util/Map;
+	public fun getBoundingBox (F)Lcenter/sciprog/maps/features/Rectangle;
+	public final fun getPoints ()Ljava/util/List;
+	public fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+	public fun withAttributes (Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/Feature;
+}
+
+public final class center/sciprog/maps/features/PolygonFeature : center/sciprog/maps/features/DomainFeature {
+	public static final field $stable I
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/util/List;Ljava/util/Map;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/util/List;Ljava/util/Map;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1 ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun component2 ()Ljava/util/List;
+	public final fun component3-hlWAoAs ()Ljava/util/Map;
+	public fun contains (Lcenter/sciprog/maps/features/ViewPoint;)Z
+	public final fun copy-EHyjM0Q (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/util/List;Ljava/util/Map;)Lcenter/sciprog/maps/features/PolygonFeature;
+	public static synthetic fun copy-EHyjM0Q$default (Lcenter/sciprog/maps/features/PolygonFeature;Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/util/List;Ljava/util/Map;ILjava/lang/Object;)Lcenter/sciprog/maps/features/PolygonFeature;
+	public fun equals (Ljava/lang/Object;)Z
+	public fun getAttributes-hlWAoAs ()Ljava/util/Map;
+	public fun getBoundingBox (F)Lcenter/sciprog/maps/features/Rectangle;
+	public final fun getPoints ()Ljava/util/List;
+	public fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+	public fun withAttributes (Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/Feature;
+}
+
+public abstract interface class center/sciprog/maps/features/Rectangle : center/sciprog/maps/features/Area {
+	public abstract fun getA ()Ljava/lang/Object;
+	public abstract fun getB ()Ljava/lang/Object;
+	public abstract fun getCenter ()Ljava/lang/Object;
+}
+
+public final class center/sciprog/maps/features/RectangleFeature : center/sciprog/maps/features/MarkerFeature {
+	public static final field $stable I
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;JLjava/util/Map;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;JLjava/util/Map;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1 ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun component2 ()Ljava/lang/Object;
+	public final fun component3-MYxV2XQ ()J
+	public final fun component4-hlWAoAs ()Ljava/util/Map;
+	public final fun copy-tzWo0Eo (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;JLjava/util/Map;)Lcenter/sciprog/maps/features/RectangleFeature;
+	public static synthetic fun copy-tzWo0Eo$default (Lcenter/sciprog/maps/features/RectangleFeature;Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;JLjava/util/Map;ILjava/lang/Object;)Lcenter/sciprog/maps/features/RectangleFeature;
+	public fun equals (Ljava/lang/Object;)Z
+	public fun getAttributes-hlWAoAs ()Ljava/util/Map;
+	public fun getBoundingBox (F)Lcenter/sciprog/maps/features/Rectangle;
+	public fun getCenter ()Ljava/lang/Object;
+	public final fun getSize-MYxV2XQ ()J
+	public fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+	public fun withAttributes (Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/Feature;
+	public fun withCoordinates (Ljava/lang/Object;)Lcenter/sciprog/maps/features/Feature;
+}
+
+public final class center/sciprog/maps/features/ScalableImageFeature : center/sciprog/maps/features/Feature, center/sciprog/maps/features/PainterFeature {
+	public static final field $stable I
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/Rectangle;Ljava/util/Map;Lkotlin/jvm/functions/Function2;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/Rectangle;Ljava/util/Map;Lkotlin/jvm/functions/Function2;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1 ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun component2 ()Lcenter/sciprog/maps/features/Rectangle;
+	public final fun component3-hlWAoAs ()Ljava/util/Map;
+	public final fun component4 ()Lkotlin/jvm/functions/Function2;
+	public final fun copy-4xdkkFs (Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/Rectangle;Ljava/util/Map;Lkotlin/jvm/functions/Function2;)Lcenter/sciprog/maps/features/ScalableImageFeature;
+	public static synthetic fun copy-4xdkkFs$default (Lcenter/sciprog/maps/features/ScalableImageFeature;Lcenter/sciprog/maps/features/CoordinateSpace;Lcenter/sciprog/maps/features/Rectangle;Ljava/util/Map;Lkotlin/jvm/functions/Function2;ILjava/lang/Object;)Lcenter/sciprog/maps/features/ScalableImageFeature;
+	public fun equals (Ljava/lang/Object;)Z
+	public fun getAttributes-hlWAoAs ()Ljava/util/Map;
+	public fun getBoundingBox (F)Lcenter/sciprog/maps/features/Rectangle;
+	public final fun getPainter ()Lkotlin/jvm/functions/Function2;
+	public fun getPainter (Landroidx/compose/runtime/Composer;I)Landroidx/compose/ui/graphics/painter/Painter;
+	public final fun getRectangle ()Lcenter/sciprog/maps/features/Rectangle;
+	public fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+	public fun withAttributes (Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/Feature;
+}
+
+public final class center/sciprog/maps/features/StrokeAttribute : center/sciprog/attributes/Attribute {
+	public static final field $stable I
+	public static final field INSTANCE Lcenter/sciprog/maps/features/StrokeAttribute;
+}
+
+public final class center/sciprog/maps/features/TextFeature : center/sciprog/maps/features/DraggableFeature {
+	public static final field $stable I
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;Ljava/lang/String;Ljava/util/Map;Lkotlin/jvm/functions/Function1;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;Ljava/lang/String;Ljava/util/Map;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1 ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun component2 ()Ljava/lang/Object;
+	public final fun component3 ()Ljava/lang/String;
+	public final fun component4-hlWAoAs ()Ljava/util/Map;
+	public final fun component5 ()Lkotlin/jvm/functions/Function1;
+	public final fun copy-JCOR_Dk (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;Ljava/lang/String;Ljava/util/Map;Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/TextFeature;
+	public static synthetic fun copy-JCOR_Dk$default (Lcenter/sciprog/maps/features/TextFeature;Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;Ljava/lang/String;Ljava/util/Map;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lcenter/sciprog/maps/features/TextFeature;
+	public fun equals (Ljava/lang/Object;)Z
+	public fun getAttributes-hlWAoAs ()Ljava/util/Map;
+	public fun getBoundingBox (F)Lcenter/sciprog/maps/features/Rectangle;
+	public final fun getFontConfig ()Lkotlin/jvm/functions/Function1;
+	public final fun getPosition ()Ljava/lang/Object;
+	public fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun getText ()Ljava/lang/String;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+	public fun withAttributes (Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/Feature;
+	public fun withCoordinates (Ljava/lang/Object;)Lcenter/sciprog/maps/features/Feature;
+}
+
+public final class center/sciprog/maps/features/VectorIconFeature : center/sciprog/maps/features/MarkerFeature, center/sciprog/maps/features/PainterFeature {
+	public static final field $stable I
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;JLandroidx/compose/ui/graphics/vector/ImageVector;Ljava/util/Map;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;JLandroidx/compose/ui/graphics/vector/ImageVector;Ljava/util/Map;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1 ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public final fun component2 ()Ljava/lang/Object;
+	public final fun component3-MYxV2XQ ()J
+	public final fun component4 ()Landroidx/compose/ui/graphics/vector/ImageVector;
+	public final fun component5-hlWAoAs ()Ljava/util/Map;
+	public final fun copy-xcw5jm0 (Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;JLandroidx/compose/ui/graphics/vector/ImageVector;Ljava/util/Map;)Lcenter/sciprog/maps/features/VectorIconFeature;
+	public static synthetic fun copy-xcw5jm0$default (Lcenter/sciprog/maps/features/VectorIconFeature;Lcenter/sciprog/maps/features/CoordinateSpace;Ljava/lang/Object;JLandroidx/compose/ui/graphics/vector/ImageVector;Ljava/util/Map;ILjava/lang/Object;)Lcenter/sciprog/maps/features/VectorIconFeature;
+	public fun equals (Ljava/lang/Object;)Z
+	public fun getAttributes-hlWAoAs ()Ljava/util/Map;
+	public fun getBoundingBox (F)Lcenter/sciprog/maps/features/Rectangle;
+	public fun getCenter ()Ljava/lang/Object;
+	public final fun getImage ()Landroidx/compose/ui/graphics/vector/ImageVector;
+	public synthetic fun getPainter (Landroidx/compose/runtime/Composer;I)Landroidx/compose/ui/graphics/painter/Painter;
+	public fun getPainter (Landroidx/compose/runtime/Composer;I)Landroidx/compose/ui/graphics/vector/VectorPainter;
+	public final fun getSize-MYxV2XQ ()J
+	public fun getSpace ()Lcenter/sciprog/maps/features/CoordinateSpace;
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+	public fun withAttributes (Lkotlin/jvm/functions/Function1;)Lcenter/sciprog/maps/features/Feature;
+	public fun withCoordinates (Ljava/lang/Object;)Lcenter/sciprog/maps/features/Feature;
+}
+
+public final class center/sciprog/maps/features/ViewConfig {
+	public static final field $stable I
+	public fun <init> ()V
+	public fun <init> (FLcenter/sciprog/maps/features/MouseListener;Lcenter/sciprog/maps/features/DragHandle;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;ZZ)V
+	public synthetic fun <init> (FLcenter/sciprog/maps/features/MouseListener;Lcenter/sciprog/maps/features/DragHandle;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;ZZILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public final fun component1 ()F
+	public final fun component2 ()Lcenter/sciprog/maps/features/MouseListener;
+	public final fun component3 ()Lcenter/sciprog/maps/features/DragHandle;
+	public final fun component4 ()Lkotlin/jvm/functions/Function1;
+	public final fun component5 ()Lkotlin/jvm/functions/Function1;
+	public final fun component6 ()Lkotlin/jvm/functions/Function1;
+	public final fun component7 ()Z
+	public final fun component8 ()Z
+	public final fun copy (FLcenter/sciprog/maps/features/MouseListener;Lcenter/sciprog/maps/features/DragHandle;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;ZZ)Lcenter/sciprog/maps/features/ViewConfig;
+	public static synthetic fun copy$default (Lcenter/sciprog/maps/features/ViewConfig;FLcenter/sciprog/maps/features/MouseListener;Lcenter/sciprog/maps/features/DragHandle;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;ZZILjava/lang/Object;)Lcenter/sciprog/maps/features/ViewConfig;
+	public fun equals (Ljava/lang/Object;)Z
+	public final fun getDragHandle ()Lcenter/sciprog/maps/features/DragHandle;
+	public final fun getOnCanvasSizeChange ()Lkotlin/jvm/functions/Function1;
+	public final fun getOnClick ()Lcenter/sciprog/maps/features/MouseListener;
+	public final fun getOnSelect ()Lkotlin/jvm/functions/Function1;
+	public final fun getOnViewChange ()Lkotlin/jvm/functions/Function1;
+	public final fun getZoomOnDoubleClick ()Z
+	public final fun getZoomOnSelect ()Z
+	public final fun getZoomSpeed ()F
+	public fun hashCode ()I
+	public fun toString ()Ljava/lang/String;
+}
+
+public abstract interface class center/sciprog/maps/features/ViewPoint {
+	public abstract fun getFocus ()Ljava/lang/Object;
+	public abstract fun getZoom ()F
+}
+
+public final class center/sciprog/maps/features/VisibleAttribute : center/sciprog/attributes/Attribute {
+	public static final field $stable I
+	public static final field INSTANCE Lcenter/sciprog/maps/features/VisibleAttribute;
+}
+
+public final class center/sciprog/maps/features/ZAttribute : center/sciprog/attributes/Attribute {
+	public static final field $stable I
+	public static final field INSTANCE Lcenter/sciprog/maps/features/ZAttribute;
+}
+
+public final class center/sciprog/maps/features/ZoomRangeAttribute : center/sciprog/attributes/Attribute {
+	public static final field $stable I
+	public static final field INSTANCE Lcenter/sciprog/maps/features/ZoomRangeAttribute;
+}
+

maps-kt-features/build.gradle.kts

@@ -0,0 +1,30 @@
+plugins {
+    id("space.kscience.gradle.mpp")
+    id("org.jetbrains.compose")
+    `maven-publish`
+}
+
+val kmathVersion: String by rootProject.extra
+
+kscience{
+    jvm()
+    js()
+    useSerialization{
+        json()
+    }
+
+    useSerialization(sourceSet = space.kscience.gradle.DependencySourceSet.TEST){
+        protobuf()
+    }
+}
+
+kotlin {
+    sourceSets {
+        commonMain {
+            dependencies {
+                api(projects.trajectoryKt)
+                api(compose.foundation)
+            }
+        }
+    }
+}

maps-kt-features/src/commonMain/kotlin/center.sciprog.attributes/Attribute.kt

@@ -0,0 +1,22 @@
+package center.sciprog.attributes
+
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.builtins.serializer
+
+public interface Attribute<T>
+
+public abstract class SerializableAttribute<T>(
+    public val serialId: String,
+    public val serializer: KSerializer<T>,
+) : Attribute<T> {
+    override fun toString(): String = serialId
+}
+
+public interface AttributeWithDefault<T> : Attribute<T> {
+    public val default: T
+}
+
+public interface SetAttribute<V> : Attribute<Set<V>>
+
+public object NameAttribute : SerializableAttribute<String>("name", String.serializer())
+

maps-kt-features/src/commonMain/kotlin/center.sciprog.attributes/Attributes.kt

@@ -0,0 +1,74 @@
+package center.sciprog.attributes
+
+import center.sciprog.maps.features.Feature
+import center.sciprog.maps.features.ZAttribute
+import kotlin.jvm.JvmInline
+
+@JvmInline
+public value class Attributes internal constructor(public val content: Map<out Attribute<*>, Any>) {
+
+    public val keys: Set<Attribute<*>> get() = content.keys
+
+    @Suppress("UNCHECKED_CAST")
+    public operator fun <T> get(attribute: Attribute<T>): T? = content[attribute] as? T
+
+    override fun toString(): String = "Attributes(value=${content.entries})"
+
+    public companion object {
+        public val EMPTY: Attributes = Attributes(emptyMap())
+    }
+}
+
+public fun Attributes.isEmpty(): Boolean = content.isEmpty()
+
+public fun <T> Attributes.getOrDefault(attribute: AttributeWithDefault<T>): T = get(attribute) ?: attribute.default
+
+public fun <T, A : Attribute<T>> Attributes.withAttribute(
+    attribute: A,
+    attrValue: T?,
+): Attributes = Attributes(
+    if (attrValue == null) {
+        content - attribute
+    } else {
+        content + (attribute to attrValue)
+    }
+)
+
+/**
+ * Add an element to a [SetAttribute]
+ */
+public fun <T, A : SetAttribute<T>> Attributes.withAttributeElement(
+    attribute: A,
+    attrValue: T,
+): Attributes {
+    val currentSet: Set<T> = get(attribute) ?: emptySet()
+    return Attributes(
+        content + (attribute to (currentSet + attrValue))
+    )
+}
+
+/**
+ * Remove an element from [SetAttribute]
+ */
+public fun <T, A : SetAttribute<T>> Attributes.withoutAttributeElement(
+    attribute: A,
+    attrValue: T,
+): Attributes {
+    val currentSet: Set<T> = get(attribute) ?: emptySet()
+    return Attributes(
+        content + (attribute to (currentSet - attrValue))
+    )
+}
+
+public fun <T : Any, A : Attribute<T>> Attributes(
+    attribute: A,
+    attrValue: T,
+): Attributes = Attributes(mapOf(attribute to attrValue))
+
+public operator fun Attributes.plus(other: Attributes): Attributes = Attributes(content + other.content)
+
+public val Feature<*>.z: Float
+    get() = attributes[ZAttribute] ?: 0f
+//    set(value) {
+//        attributes[ZAttribute] = value
+//    }

maps-kt-features/src/commonMain/kotlin/center.sciprog.attributes/AttributesBuilder.kt

@@ -0,0 +1,47 @@
+package center.sciprog.attributes
+
+/**
+ * A safe builder for [Attributes]
+ */
+public class AttributesBuilder internal constructor(private val map: MutableMap<Attribute<*>, Any> = mutableMapOf()) {
+
+    @Suppress("UNCHECKED_CAST")
+    public operator fun <T> get(attribute: Attribute<T>): T? = map[attribute] as? T
+
+    public operator fun <V> Attribute<V>.invoke(value: V?) {
+        if (value == null) {
+            map.remove(this)
+        } else {
+            map[this] = value
+        }
+    }
+
+    public fun from(attributes: Attributes) {
+        map.putAll(attributes.content)
+    }
+
+    public fun <V> SetAttribute<V>.add(
+        attrValue: V,
+    ) {
+        val currentSet: Set<V> = get(this) ?: emptySet()
+        map[this] = currentSet + attrValue
+    }
+
+    /**
+     * Remove an element from [SetAttribute]
+     */
+    public fun <V> SetAttribute<V>.remove(
+        attrValue: V,
+    ) {
+        val currentSet: Set<V> = get(this) ?: emptySet()
+        map[this] = currentSet - attrValue
+    }
+
+    public fun build(): Attributes = Attributes(map)
+}
+
+public fun AttributesBuilder(
+    attributes: Attributes,
+): AttributesBuilder = AttributesBuilder(attributes.content.toMutableMap())
+
+public fun Attributes(builder: AttributesBuilder.() -> Unit): Attributes = AttributesBuilder().apply(builder).build()

maps-kt-features/src/commonMain/kotlin/center.sciprog.attributes/AttributesSerializer.kt

@@ -0,0 +1,55 @@
+@file:Suppress("UNCHECKED_CAST")
+
+package center.sciprog.attributes
+
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
+import kotlinx.serialization.json.*
+
+public class AttributesSerializer(
+    private val serializableAttributes: Set<SerializableAttribute<*>>,
+) : KSerializer<Attributes> {
+    private val jsonSerializer = JsonObject.serializer()
+    override val descriptor: SerialDescriptor get() = jsonSerializer.descriptor
+
+    override fun deserialize(decoder: Decoder): Attributes {
+        val jsonElement = jsonSerializer.deserialize(decoder)
+        val attributeMap: Map<SerializableAttribute<*>, Any> = jsonElement.entries.associate { (key, element) ->
+            val attr = serializableAttributes.find { it.serialId == key }
+                ?: error("Attribute serializer for key $key not found")
+
+            val json = if (decoder is JsonDecoder) {
+                decoder.json
+            } else {
+                Json { serializersModule = decoder.serializersModule }
+            }
+            val value = json.decodeFromJsonElement(attr.serializer, element) ?: error("Null values are not allowed")
+
+            attr to value
+        }
+        return Attributes(attributeMap)
+    }
+
+    override fun serialize(encoder: Encoder, value: Attributes) {
+        val json = buildJsonObject {
+            value.content.forEach { (key: Attribute<*>, value: Any) ->
+                if (key !in serializableAttributes) error("An attribute key '$key' is not in the list of allowed attributes for this serializer")
+                val serializableKey = key as SerializableAttribute
+
+                val json = if (encoder is JsonEncoder) {
+                    encoder.json
+                } else {
+                    Json { serializersModule = encoder.serializersModule }
+                }
+
+                put(
+                    serializableKey.serialId,
+                    json.encodeToJsonElement(serializableKey.serializer as KSerializer<Any>, value)
+                )
+            }
+        }
+        jsonSerializer.serialize(encoder, json)
+    }
+}

maps-kt-features/src/commonMain/kotlin/center/sciprog/maps/features/CoordinateSpace.kt

@@ -0,0 +1,86 @@
+package center.sciprog.maps.features
+
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.DpOffset
+import androidx.compose.ui.unit.DpSize
+import androidx.compose.ui.unit.dp
+import kotlin.math.abs
+import kotlin.math.sqrt
+
+
+public interface Area<T : Any> {
+    public operator fun contains(point: T): Boolean
+}
+
+/**
+ * A map coordinates rectangle. [a] and [b] represent opposing angles
+ * of the rectangle without specifying which ones.
+ */
+public interface Rectangle<T : Any> : Area<T> {
+    public val a: T
+    public val b: T
+
+    public val center: T
+}
+
+/**
+ * A context for map/scheme coordinates manipulation
+ */
+public interface CoordinateSpace<T : Any> {
+
+    /**
+     * Build a rectangle by two opposing corners
+     */
+    public fun Rectangle(first: T, second: T): Rectangle<T>
+
+    /**
+     * Build a rectangle of visual size [size]
+     */
+    public fun Rectangle(center: T, zoom: Float, size: DpSize): Rectangle<T>
+
+    /**
+     * A view point used by default
+     */
+    public val defaultViewPoint: ViewPoint<T>
+
+    /**
+     * Create a [ViewPoint] associated with this coordinate space.
+     */
+    public fun ViewPoint(center: T, zoom: Float): ViewPoint<T>
+
+    public fun ViewPoint<T>.moveBy(delta: T): ViewPoint<T>
+
+    public fun ViewPoint<T>.zoomBy(
+        zoomDelta: Float,
+        invariant: T = focus,
+    ): ViewPoint<T>
+
+    /**
+     * Move given rectangle to be centered at [center]
+     */
+    public fun Rectangle<T>.withCenter(center: T): Rectangle<T>
+
+    public fun Collection<Rectangle<T>>.wrapRectangles(): Rectangle<T>?
+
+    public fun Collection<T>.wrapPoints(): Rectangle<T>?
+
+    public fun T.offsetTo(b: T, zoom: Float): DpOffset
+
+    public fun T.distanceTo(b: T, zoom: Float): Dp {
+        val offset: DpOffset = offsetTo(b, zoom)
+        return sqrt(offset.x.value * offset.x.value + offset.y.value * offset.y.value).dp
+    }
+
+    public fun T.distanceToLine(a: T, b: T, zoom: Float): Dp {
+        val d12 = a.offsetTo(b, zoom)
+        val d01 = offsetTo(a, zoom)
+        val distanceVale = abs(d12.x.value * d01.y.value - d12.y.value * d01.x.value) / a.distanceTo(b, zoom).value
+
+        return distanceVale.dp
+    }
+
+    public fun T.isInsidePolygon(points: List<T>): Boolean
+}
+
+public fun <T : Any> CoordinateSpace<T>.Rectangle(viewPoint: ViewPoint<T>, size: DpSize): Rectangle<T> =
+    Rectangle(viewPoint.focus, viewPoint.zoom, size)

maps-kt-features/src/commonMain/kotlin/center/sciprog/maps/features/CoordinateViewScope.kt

@@ -0,0 +1,63 @@
+package center.sciprog.maps.features
+
+import androidx.compose.runtime.MutableState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.unit.*
+
+public abstract class CoordinateViewScope<T : Any>(
+    public val config: ViewConfig<T>,
+) {
+
+    public abstract val space: CoordinateSpace<T>
+
+    private var canvasSizeState: MutableState<DpSize?> = mutableStateOf(null)
+    private var viewPointState: MutableState<ViewPoint<T>?> = mutableStateOf(null)
+
+    public var canvasSize: DpSize
+        get() = canvasSizeState.value ?: DpSize(512.dp, 512.dp)
+        set(value) {
+            canvasSizeState.value = value
+        }
+
+    public var viewPoint: ViewPoint<T>
+        get() = viewPointState.value ?: space.defaultViewPoint
+        set(value) {
+            viewPointState.value = value
+            config.onViewChange(viewPoint)
+        }
+
+    public val zoom: Float get() = viewPoint.zoom
+
+
+    // Selection rectangle. If null - no selection
+    public var selectRect: DpRect? by mutableStateOf(null)
+
+    public abstract fun DpOffset.toCoordinates(): T
+
+
+    public abstract fun T.toDpOffset(): DpOffset
+
+    public fun T.toOffset(density: Density): Offset = with(density) {
+        val dpOffset = this@toOffset.toDpOffset()
+        Offset(dpOffset.x.toPx(), dpOffset.y.toPx())
+    }
+
+    public fun Offset.toCoordinates(density: Density): T = with(density) {
+        val dpOffset = DpOffset(x.toDp(), y.toDp())
+        dpOffset.toCoordinates()
+    }
+
+    public abstract fun Rectangle<T>.toDpRect(): DpRect
+
+    public abstract fun ViewPoint<T>.moveBy(x: Dp, y: Dp): ViewPoint<T>
+
+    public abstract fun computeViewPoint(rectangle: Rectangle<T>): ViewPoint<T>
+}
+
+
+public val DpRect.topLeft: DpOffset get() = DpOffset(left, top)
+
+public val DpRect.bottomRight: DpOffset get() = DpOffset(right, bottom)

maps-kt-features/src/commonMain/kotlin/center/sciprog/maps/features/DragHandle.kt

@@ -0,0 +1,56 @@
+package center.sciprog.maps.features
+
+import androidx.compose.ui.input.pointer.PointerEvent
+import androidx.compose.ui.input.pointer.isPrimaryPressed
+
+/**
+ * @param result - the endpoint of the drag to perform constrained drag
+ * @param handleNext - if false do not evaluate subsequent drag handles
+ */
+public data class DragResult<T : Any>(val result: ViewPoint<T>, val handleNext: Boolean = true)
+
+public fun interface DragListener<in T : Any> {
+    public fun handle(event: PointerEvent, from: ViewPoint<T>, to: ViewPoint<T>)
+}
+
+public fun interface DragHandle<T : Any> {
+    /**
+     * @param event - qualifiers of the event used for drag
+     * @param start - is a point where drag begins, end is a point where drag ends
+     * @param end - end point of the drag
+     *
+     * @return true if default event processors should be used after this one
+     */
+    public fun handle(event: PointerEvent, start: ViewPoint<T>, end: ViewPoint<T>): DragResult<T>
+
+    public companion object {
+        public fun <T : Any> bypass(): DragHandle<T> = DragHandle<T> { _, _, end -> DragResult(end) }
+
+        /**
+         * Process only events with primary button pressed
+         */
+        public fun <T : Any> withPrimaryButton(
+            block: (event: PointerEvent, start: ViewPoint<T>, end: ViewPoint<T>) -> DragResult<T>,
+        ): DragHandle<T> = DragHandle { event, start, end ->
+            if (event.buttons.isPrimaryPressed) {
+                block(event, start, end)
+            } else {
+                DragResult(end)
+            }
+        }
+
+        /**
+         * Combine several handles into one
+         */
+        public fun <T : Any> combine(vararg handles: DragHandle<T>): DragHandle<T> = DragHandle { event, start, end ->
+            var current: ViewPoint<T> = end
+            handles.forEach {
+                val result = it.handle(event, start, current)
+                if (!result.handleNext) return@DragHandle result else {
+                    current = result.result
+                }
+            }
+            return@DragHandle DragResult(current)
+        }
+    }
+}

maps-kt-features/src/commonMain/kotlin/center/sciprog/maps/features/Feature.kt

@@ -0,0 +1,364 @@
+package center.sciprog.maps.features
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.Stable
+import androidx.compose.ui.geometry.Rect
+import androidx.compose.ui.graphics.Brush
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.ImageBitmap
+import androidx.compose.ui.graphics.Path
+import androidx.compose.ui.graphics.drawscope.DrawScope
+import androidx.compose.ui.graphics.drawscope.DrawStyle
+import androidx.compose.ui.graphics.drawscope.Fill
+import androidx.compose.ui.graphics.painter.Painter
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.graphics.vector.VectorPainter
+import androidx.compose.ui.graphics.vector.rememberVectorPainter
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.DpSize
+import androidx.compose.ui.unit.dp
+import center.sciprog.attributes.Attributes
+import center.sciprog.attributes.NameAttribute
+import space.kscience.kmath.geometry.Angle
+import space.kscience.kmath.nd.Structure2D
+
+public typealias FloatRange = ClosedFloatingPointRange<Float>
+
+public interface Feature<T : Any> {
+
+    public val space: CoordinateSpace<T>
+
+    public val attributes: Attributes
+
+    public fun getBoundingBox(zoom: Float = Float.MAX_VALUE): Rectangle<T>?
+
+    public fun withAttributes(modify: Attributes.() -> Attributes): Feature<T>
+}
+
+public val Feature<*>.color: Color? get() = attributes[ColorAttribute]
+
+public val Feature<*>.zoomRange: FloatRange
+    get() = attributes[ZoomRangeAttribute] ?: Float.NEGATIVE_INFINITY..Float.POSITIVE_INFINITY
+
+public val Feature<*>.name: String?
+    get() = attributes[NameAttribute]
+
+public interface PainterFeature<T : Any> : Feature<T> {
+    @Composable
+    public fun getPainter(): Painter
+}
+
+public interface DomainFeature<T : Any> : Feature<T> {
+    public operator fun contains(viewPoint: ViewPoint<T>): Boolean = getBoundingBox(viewPoint.zoom)?.let {
+        viewPoint.focus in it
+    } ?: false
+}
+
+public interface DraggableFeature<T : Any> : DomainFeature<T> {
+    public fun withCoordinates(newCoordinates: T): Feature<T>
+}
+
+/**
+ * A draggable marker feature. Other features could be bound to this one.
+ */
+public interface MarkerFeature<T : Any> : DraggableFeature<T> {
+    public val center: T
+}
+
+public fun <T : Any> Iterable<Feature<T>>.computeBoundingBox(
+    space: CoordinateSpace<T>,
+    zoom: Float,
+): Rectangle<T>? = with(space) {
+    mapNotNull { it.getBoundingBox(zoom) }.wrapRectangles()
+}
+
+/**
+ * A feature that decides what to show depending on the zoom value (it could change size of shape)
+ */
+@Stable
+public data class FeatureSelector<T : Any>(
+    override val space: CoordinateSpace<T>,
+    override val attributes: Attributes = Attributes.EMPTY,
+    public val selector: (zoom: Float) -> Feature<T>,
+) : Feature<T> {
+
+    override fun getBoundingBox(zoom: Float): Rectangle<T>? = selector(zoom).getBoundingBox(zoom)
+
+    override fun withAttributes(modify: Attributes.() -> Attributes): Feature<T> = copy(attributes = modify(attributes))
+}
+
+@Stable
+public data class PathFeature<T : Any>(
+    override val space: CoordinateSpace<T>,
+    public val rectangle: Rectangle<T>,
+    public val path: Path,
+    public val brush: Brush,
+    public val style: DrawStyle = Fill,
+    public val targetRect: Rect = path.getBounds(),
+    override val attributes: Attributes = Attributes.EMPTY,
+) : DraggableFeature<T> {
+    override fun withCoordinates(newCoordinates: T): Feature<T> = with(space) {
+        PathFeature(
+            space = space,
+            rectangle = rectangle.withCenter(newCoordinates),
+            path = path,
+            brush = brush,
+            style = style,
+            targetRect = targetRect,
+        )
+    }
+
+    override fun getBoundingBox(zoom: Float): Rectangle<T> = rectangle
+    override fun withAttributes(modify: Attributes.() -> Attributes): Feature<T> = copy(attributes = modify(attributes))
+}
+
+@Stable
+public data class PointsFeature<T : Any>(
+    override val space: CoordinateSpace<T>,
+    public val points: List<T>,
+    override val attributes: Attributes = Attributes.EMPTY,
+) : Feature<T> {
+
+    private val boundingBox by lazy {
+        with(space) { points.wrapPoints() }
+    }
+
+    override fun getBoundingBox(zoom: Float): Rectangle<T>? = boundingBox
+    override fun withAttributes(modify: (Attributes) -> Attributes): Feature<T> = copy(attributes = modify(attributes))
+}
+
+
+public interface LineSegmentFeature<T : Any> : Feature<T>
+
+@Stable
+public data class LineFeature<T : Any>(
+    override val space: CoordinateSpace<T>,
+    public val a: T,
+    public val b: T,
+    override val attributes: Attributes = Attributes.EMPTY,
+) : DomainFeature<T>, LineSegmentFeature<T> {
+    override fun getBoundingBox(zoom: Float): Rectangle<T> = space.Rectangle(a, b)
+
+    val center: T by lazy { getBoundingBox().center }
+
+    override fun contains(viewPoint: ViewPoint<T>): Boolean = with(space) {
+        val length = a.distanceTo(b, viewPoint.zoom)
+        viewPoint.focus.distanceTo(center, viewPoint.zoom) <= length / 2 &&
+                viewPoint.focus.distanceToLine(a, b, viewPoint.zoom).value <= clickRadius
+    }
+
+    override fun withAttributes(modify: (Attributes) -> Attributes): Feature<T> = copy(attributes = modify(attributes))
+}
+
+public data class MultiLineFeature<T : Any>(
+    override val space: CoordinateSpace<T>,
+    public val points: List<T>,
+    override val attributes: Attributes = Attributes.EMPTY,
+) : DomainFeature<T>, LineSegmentFeature<T> {
+
+    private val boundingBox by lazy {
+        with(space) { points.wrapPoints() }
+    }
+
+    override fun getBoundingBox(zoom: Float): Rectangle<T>? = boundingBox
+    override fun withAttributes(modify: (Attributes) -> Attributes): Feature<T> = copy(attributes = modify(attributes))
+
+    override fun contains(viewPoint: ViewPoint<T>): Boolean = with(space) {
+        val boundingBox = getBoundingBox(viewPoint.zoom) ?: return@with false
+        viewPoint.focus in boundingBox && points.zipWithNext().minOf { (a, b) ->
+            viewPoint.focus.distanceToLine(
+                a,
+                b,
+                viewPoint.zoom
+            ).value
+        } < clickRadius
+    }
+}
+
+
+private val <T : Any, F : LineSegmentFeature<T>> F.clickRadius get() = attributes[ClickRadius] ?: 10f
+
+
+@Stable
+public data class PolygonFeature<T : Any>(
+    override val space: CoordinateSpace<T>,
+    public val points: List<T>,
+    override val attributes: Attributes = Attributes.EMPTY,
+) : DomainFeature<T> {
+
+    private val boundingBox: Rectangle<T>? by lazy {
+        with(space) { points.wrapPoints() }
+    }
+
+    override fun getBoundingBox(zoom: Float): Rectangle<T>? = boundingBox
+
+    override fun contains(viewPoint: ViewPoint<T>): Boolean {
+        val boundingBox = boundingBox ?: return false
+        return viewPoint.focus in boundingBox && with(space) { viewPoint.focus.isInsidePolygon(points) }
+    }
+
+    override fun withAttributes(modify: (Attributes) -> Attributes): Feature<T> = copy(attributes = modify(attributes))
+}
+
+@Stable
+public data class CircleFeature<T : Any>(
+    override val space: CoordinateSpace<T>,
+    override val center: T,
+    public val radius: Dp = 5.dp,
+    override val attributes: Attributes = Attributes.EMPTY,
+) : MarkerFeature<T> {
+    override fun getBoundingBox(zoom: Float): Rectangle<T> =
+        space.Rectangle(center, zoom, DpSize(radius * 2, radius * 2))
+
+    override fun contains(viewPoint: ViewPoint<T>): Boolean = with(space) {
+        viewPoint.focus.distanceTo(center, viewPoint.zoom) < radius
+    }
+
+    override fun withCoordinates(newCoordinates: T): Feature<T> = copy(center = newCoordinates)
+
+    override fun withAttributes(modify: (Attributes) -> Attributes): Feature<T> = copy(attributes = modify(attributes))
+}
+
+@Stable
+public data class RectangleFeature<T : Any>(
+    override val space: CoordinateSpace<T>,
+    override val center: T,
+    public val size: DpSize = DpSize(5.dp, 5.dp),
+    override val attributes: Attributes = Attributes.EMPTY,
+) : MarkerFeature<T> {
+    override fun getBoundingBox(zoom: Float): Rectangle<T> =
+        space.Rectangle(center, zoom, size)
+
+    override fun withCoordinates(newCoordinates: T): Feature<T> = copy(center = newCoordinates)
+
+    override fun withAttributes(modify: (Attributes) -> Attributes): Feature<T> = copy(attributes = modify(attributes))
+}
+
+/**
+ * @param startAngle the angle from 3 o'clock downwards for the start of the arc in radians
+ * @param arcLength arc length in radians
+ */
+@Stable
+public data class ArcFeature<T : Any>(
+    override val space: CoordinateSpace<T>,
+    public val oval: Rectangle<T>,
+    public val startAngle: Angle,
+    public val arcLength: Angle,
+    override val attributes: Attributes = Attributes.EMPTY,
+) : DraggableFeature<T> {
+    override fun getBoundingBox(zoom: Float): Rectangle<T> = oval
+
+    override fun withCoordinates(newCoordinates: T): Feature<T> =
+        copy(oval = with(space) { oval.withCenter(newCoordinates) })
+
+    override fun withAttributes(modify: (Attributes) -> Attributes): Feature<T> = copy(attributes = modify(attributes))
+}
+
+public data class DrawFeature<T : Any>(
+    override val space: CoordinateSpace<T>,
+    public val position: T,
+    override val attributes: Attributes = Attributes.EMPTY,
+    public val drawFeature: DrawScope.() -> Unit,
+) : DraggableFeature<T> {
+    override fun getBoundingBox(zoom: Float): Rectangle<T> = space.Rectangle(position, position)
+
+    override fun withCoordinates(newCoordinates: T): Feature<T> = copy(position = newCoordinates)
+
+    override fun withAttributes(modify: (Attributes) -> Attributes): Feature<T> = copy(attributes = modify(attributes))
+}
+
+/**
+ * Fixed size bitmap icon
+ */
+@Stable
+public data class BitmapIconFeature<T : Any>(
+    override val space: CoordinateSpace<T>,
+    override val center: T,
+    public val size: DpSize,
+    public val image: ImageBitmap,
+    override val attributes: Attributes = Attributes.EMPTY,
+) : MarkerFeature<T> {
+    override fun getBoundingBox(zoom: Float): Rectangle<T> = space.Rectangle(center, zoom, size)
+
+    override fun withCoordinates(newCoordinates: T): Feature<T> = copy(center = newCoordinates)
+
+    override fun withAttributes(modify: (Attributes) -> Attributes): Feature<T> = copy(attributes = modify(attributes))
+}
+
+/**
+ * Fixed size vector icon
+ */
+@Stable
+public data class VectorIconFeature<T : Any>(
+    override val space: CoordinateSpace<T>,
+    override val center: T,
+    public val size: DpSize,
+    public val image: ImageVector,
+    override val attributes: Attributes = Attributes.EMPTY,
+) : MarkerFeature<T>, PainterFeature<T> {
+    override fun getBoundingBox(zoom: Float): Rectangle<T> = space.Rectangle(center, zoom, size)
+
+    override fun withCoordinates(newCoordinates: T): Feature<T> = copy(center = newCoordinates)
+
+    override fun withAttributes(modify: (Attributes) -> Attributes): Feature<T> = copy(attributes = modify(attributes))
+
+    @Composable
+    override fun getPainter(): VectorPainter = rememberVectorPainter(image)
+}
+
+/**
+ * An image that is bound to coordinates and is scaled (and possibly warped) together with them
+ *
+ * @param rectangle the size of background in scheme size units. The screen units to scheme units ratio equals scale.
+ */
+public data class ScalableImageFeature<T : Any>(
+    override val space: CoordinateSpace<T>,
+    public val rectangle: Rectangle<T>,
+    override val attributes: Attributes = Attributes.EMPTY,
+    public val painter: @Composable () -> Painter,
+) : Feature<T>, PainterFeature<T> {
+    @Composable
+    override fun getPainter(): Painter = painter.invoke()
+
+    override fun getBoundingBox(zoom: Float): Rectangle<T> = rectangle
+
+    override fun withAttributes(modify: (Attributes) -> Attributes): Feature<T> = copy(attributes = modify(attributes))
+}
+
+
+public data class TextFeature<T : Any>(
+    override val space: CoordinateSpace<T>,
+    public val position: T,
+    public val text: String,
+    override val attributes: Attributes = Attributes.EMPTY,
+    public val fontConfig: FeatureFont.() -> Unit,
+) : DraggableFeature<T> {
+    override fun getBoundingBox(zoom: Float): Rectangle<T> = space.Rectangle(position, position)
+
+    override fun withCoordinates(newCoordinates: T): Feature<T> = copy(position = newCoordinates)
+
+    override fun withAttributes(modify: (Attributes) -> Attributes): Feature<T> = copy(attributes = modify(attributes))
+}
+
+/**
+ * A pixel map representation on the map/scheme.
+ * [rectangle] describes the boundary of the pixel map.
+ * [pixelMap] contained indexed color of pixels. Minimal indices correspond to bottom-left corner of the rectangle.
+ * Maximal indices - top-right.
+ */
+public data class PixelMapFeature<T : Any>(
+    override val space: CoordinateSpace<T>,
+    val rectangle: Rectangle<T>,
+    val pixelMap: Structure2D<Color?>,
+    override val attributes: Attributes = Attributes.EMPTY,
+) : Feature<T> {
+
+    init {
+        require(pixelMap.shape[0] > 0) { "Empty dimensions in pixel map are not allowed" }
+        require(pixelMap.shape[1] > 0) { "Empty dimensions in pixel map are not allowed" }
+    }
+
+    override fun getBoundingBox(zoom: Float): Rectangle<T> = rectangle
+
+    override fun withAttributes(modify: Attributes.() -> Attributes): Feature<T> = copy(attributes = modify(attributes))
+}

maps-kt-features/src/commonMain/kotlin/center/sciprog/maps/features/FeatureFont.kt

@@ -0,0 +1,5 @@
+package center.sciprog.maps.features
+
+public expect class FeatureFont {
+    public var size: Float
+}

maps-kt-features/src/commonMain/kotlin/center/sciprog/maps/features/FeatureGroup.kt

@@ -0,0 +1,305 @@
+package center.sciprog.maps.features
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.mutableStateMapOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.snapshots.SnapshotStateMap
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.drawscope.DrawScope
+import androidx.compose.ui.graphics.painter.Painter
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.DpSize
+import androidx.compose.ui.unit.dp
+import center.sciprog.attributes.*
+import space.kscience.kmath.geometry.Angle
+import space.kscience.kmath.nd.*
+import space.kscience.kmath.structures.Buffer
+
+//@JvmInline
+//public value class FeatureId<out F : Feature<*>>(public val id: String)
+
+public class FeatureRef<T : Any, out F : Feature<T>>(public val id: String, public val parent: FeatureGroup<T>)
+
+@Suppress("UNCHECKED_CAST")
+public fun <T : Any, F : Feature<T>> FeatureRef<T, F>.resolve(): F =
+    parent.featureMap[id]?.let { it as F } ?: error("Feature with id=$id not found")
+
+public val <T : Any, F : Feature<T>> FeatureRef<T, F>.attributes: Attributes get() = resolve().attributes
+
+/**
+ * A group of other features
+ */
+public data class FeatureGroup<T : Any>(
+    override val space: CoordinateSpace<T>,
+    public val featureMap: SnapshotStateMap<String, Feature<T>> = mutableStateMapOf(),
+    override val attributes: Attributes = Attributes.EMPTY,
+) : CoordinateSpace<T> by space, Feature<T> {
+//
+//    @Suppress("UNCHECKED_CAST")
+//    public operator fun <F : Feature<T>> get(id: FeatureId<F>): F =
+//        featureMap[id.id]?.let { it as F } ?: error("Feature with id=$id not found")
+
+    private var uidCounter = 0
+
+    private fun generateUID(feature: Feature<T>?): String = if (feature == null) {
+        "@group[${uidCounter++}]"
+    } else {
+        "@${feature::class.simpleName}[${uidCounter++}]"
+    }
+
+    public fun <F : Feature<T>> feature(id: String?, feature: F): FeatureRef<T, F> {
+        val safeId = id ?: generateUID(feature)
+        featureMap[safeId] = feature
+        return FeatureRef(safeId, this)
+    }
+
+    public fun removeFeature(id: String) {
+        featureMap.remove(id)
+    }
+
+//    public fun <F : Feature<T>> feature(id: FeatureId<F>, feature: F): FeatureId<F> = feature(id.id, feature)
+
+    public val features: Collection<Feature<T>> get() = featureMap.values.sortedByDescending { it.z }
+
+    public fun visit(visitor: FeatureGroup<T>.(id: String, feature: Feature<T>) -> Unit) {
+        featureMap.entries.sortedByDescending { it.value.z }.forEach { (key, feature) ->
+            if (feature is FeatureGroup<T>) {
+                feature.visit(visitor)
+            } else {
+                visitor(this, key, feature)
+            }
+        }
+    }
+
+    public fun visitUntil(visitor: FeatureGroup<T>.(id: String, feature: Feature<T>) -> Boolean) {
+        featureMap.entries.sortedByDescending { it.value.z }.forEach { (key, feature) ->
+            if (feature is FeatureGroup<T>) {
+                feature.visitUntil(visitor)
+            } else {
+                if (!visitor(this, key, feature)) return@visitUntil
+            }
+        }
+    }
+//
+//    @Suppress("UNCHECKED_CAST")
+//    public fun <A> getAttribute(id: FeatureId<Feature<T>>, key: Attribute<A>): A? =
+//        get(id).attributes[key]
+
+
+    override fun getBoundingBox(zoom: Float): Rectangle<T>? = with(space) {
+        featureMap.values.mapNotNull { it.getBoundingBox(zoom) }.wrapRectangles()
+    }
+
+    override fun withAttributes(modify: Attributes.() -> Attributes): Feature<T> = copy(attributes = modify(attributes))
+
+
+    public companion object {
+
+        /**
+         * Build, but do not remember map feature state
+         */
+        public fun <T : Any> build(
+            coordinateSpace: CoordinateSpace<T>,
+            builder: FeatureGroup<T>.() -> Unit = {},
+        ): FeatureGroup<T> = FeatureGroup(coordinateSpace).apply(builder)
+
+        /**
+         * Build and remember map feature state
+         */
+        @Composable
+        public fun <T : Any> remember(
+            coordinateSpace: CoordinateSpace<T>,
+            builder: FeatureGroup<T>.() -> Unit = {},
+        ): FeatureGroup<T> = remember {
+            build(coordinateSpace, builder)
+        }
+
+    }
+}
+
+/**
+ * Process all features with a given attribute from the one with highest [z] to lowest
+ */
+public fun <T : Any, A> FeatureGroup<T>.forEachWithAttribute(
+    key: Attribute<A>,
+    block: FeatureGroup<T>.(id: String, feature: Feature<T>, attributeValue: A) -> Unit,
+) {
+    visit { id, feature ->
+        feature.attributes[key]?.let {
+            block(id, feature, it)
+        }
+    }
+}
+
+public fun <T : Any, A> FeatureGroup<T>.forEachWithAttributeUntil(
+    key: Attribute<A>,
+    block: FeatureGroup<T>.(id: String, feature: Feature<T>, attributeValue: A) -> Boolean,
+) {
+    visitUntil { id, feature ->
+        feature.attributes[key]?.let {
+            block(id, feature, it)
+        } ?: true
+    }
+}
+
+public inline fun <T : Any, reified F : Feature<T>> FeatureGroup<T>.forEachWithType(
+    crossinline block: (FeatureRef<T, F>) -> Unit,
+) {
+    visit { id, feature ->
+        if (feature is F) block(FeatureRef(id, this))
+    }
+}
+
+public inline fun <T : Any, reified F : Feature<T>> FeatureGroup<T>.forEachWithTypeUntil(
+    crossinline block: (FeatureRef<T, F>) -> Boolean,
+) {
+    visitUntil { id, feature ->
+        if (feature is F) block(FeatureRef(id, this)) else true
+    }
+}
+
+public fun <T : Any> FeatureGroup<T>.circle(
+    center: T,
+    size: Dp = 5.dp,
+    attributes: Attributes = Attributes.EMPTY,
+    id: String? = null,
+): FeatureRef<T, CircleFeature<T>> = feature(
+    id, CircleFeature(space, center, size, attributes)
+)
+
+public fun <T : Any> FeatureGroup<T>.rectangle(
+    centerCoordinates: T,
+    size: DpSize = DpSize(5.dp, 5.dp),
+    attributes: Attributes = Attributes.EMPTY,
+    id: String? = null,
+): FeatureRef<T, RectangleFeature<T>> = feature(
+    id, RectangleFeature(space, centerCoordinates, size, attributes)
+)
+
+public fun <T : Any> FeatureGroup<T>.draw(
+    position: T,
+    attributes: Attributes = Attributes.EMPTY,
+    id: String? = null,
+    draw: DrawScope.() -> Unit,
+): FeatureRef<T, DrawFeature<T>> = feature(
+    id,
+    DrawFeature(space, position, drawFeature = draw, attributes = attributes)
+)
+
+public fun <T : Any> FeatureGroup<T>.line(
+    aCoordinates: T,
+    bCoordinates: T,
+    attributes: Attributes = Attributes.EMPTY,
+    id: String? = null,
+): FeatureRef<T, LineFeature<T>> = feature(
+    id,
+    LineFeature(space, aCoordinates, bCoordinates, attributes)
+)
+
+public fun <T : Any> FeatureGroup<T>.arc(
+    oval: Rectangle<T>,
+    startAngle: Angle,
+    arcLength: Angle,
+    attributes: Attributes = Attributes.EMPTY,
+    id: String? = null,
+): FeatureRef<T, ArcFeature<T>> = feature(
+    id,
+    ArcFeature(space, oval, startAngle, arcLength, attributes)
+)
+
+public fun <T : Any> FeatureGroup<T>.points(
+    points: List<T>,
+    attributes: Attributes = Attributes.EMPTY,
+    id: String? = null,
+): FeatureRef<T, PointsFeature<T>> = feature(
+    id,
+    PointsFeature(space, points, attributes)
+)
+
+public fun <T : Any> FeatureGroup<T>.multiLine(
+    points: List<T>,
+    attributes: Attributes = Attributes.EMPTY,
+    id: String? = null,
+): FeatureRef<T, MultiLineFeature<T>> = feature(
+    id,
+    MultiLineFeature(space, points, attributes)
+)
+
+public fun <T : Any> FeatureGroup<T>.polygon(
+    points: List<T>,
+    attributes: Attributes = Attributes.EMPTY,
+    id: String? = null,
+): FeatureRef<T, PolygonFeature<T>> = feature(
+    id,
+    PolygonFeature(space, points, attributes)
+)
+
+public fun <T : Any> FeatureGroup<T>.icon(
+    position: T,
+    image: ImageVector,
+    size: DpSize = DpSize(image.defaultWidth, image.defaultHeight),
+    attributes: Attributes = Attributes.EMPTY,
+    id: String? = null,
+): FeatureRef<T, VectorIconFeature<T>> =
+    feature(
+        id,
+        VectorIconFeature(
+            space,
+            position,
+            size,
+            image,
+            attributes
+        )
+    )
+
+public fun <T : Any> FeatureGroup<T>.group(
+    attributes: Attributes = Attributes.EMPTY,
+    id: String? = null,
+    builder: FeatureGroup<T>.() -> Unit,
+): FeatureRef<T, FeatureGroup<T>> {
+    val collection = FeatureGroup(space).apply(builder)
+    val feature = FeatureGroup(space, collection.featureMap, attributes)
+    return feature(id, feature)
+}
+
+public fun <T : Any> FeatureGroup<T>.scalableImage(
+    box: Rectangle<T>,
+    attributes: Attributes = Attributes.EMPTY,
+    id: String? = null,
+    painter: @Composable () -> Painter,
+): FeatureRef<T, ScalableImageFeature<T>> = feature(
+    id,
+    ScalableImageFeature<T>(space, box, painter = painter, attributes = attributes)
+)
+
+public fun <T : Any> FeatureGroup<T>.text(
+    position: T,
+    text: String,
+    font: FeatureFont.() -> Unit = { size = 16f },
+    attributes: Attributes = Attributes.EMPTY,
+    id: String? = null,
+): FeatureRef<T, TextFeature<T>> = feature(
+    id,
+    TextFeature(space, position, text, fontConfig = font, attributes = attributes)
+)
+
+public fun <T> StructureND(shape: ShapeND, initializer: (IntArray) -> T): StructureND<T> {
+    val strides = Strides(shape)
+    return BufferND(strides, Buffer.boxing(strides.linearSize) { initializer(strides.index(it)) })
+}
+
+public fun <T> Structure2D(rows: Int, columns: Int, initializer: (IntArray) -> T): Structure2D<T> {
+    val strides = Strides(ShapeND(rows, columns))
+    return BufferND(strides, Buffer.boxing(strides.linearSize) { initializer(strides.index(it)) }).as2D()
+}
+
+public fun <T : Any> FeatureGroup<T>.pixelMap(
+    rectangle: Rectangle<T>,
+    pixelMap: Structure2D<Color?>,
+    attributes: Attributes = Attributes.EMPTY,
+    id: String? = null,
+): FeatureRef<T, PixelMapFeature<T>> = feature(
+    id,
+    PixelMapFeature(space, rectangle, pixelMap, attributes = attributes)
+)

maps-kt-features/src/commonMain/kotlin/center/sciprog/maps/features/MouseListener.kt

@@ -0,0 +1,25 @@
+package center.sciprog.maps.features
+
+import androidx.compose.ui.input.pointer.PointerEvent
+import androidx.compose.ui.input.pointer.isPrimaryPressed
+
+public fun interface MouseListener<in T : Any> {
+    public fun handle(event: PointerEvent, point: ViewPoint<T>): Unit
+
+    public companion object {
+        public fun <T : Any> withPrimaryButton(
+            block: (event: PointerEvent, click: ViewPoint<T>) -> Unit,
+        ): MouseListener<T> = MouseListener { event, click ->
+            if (event.buttons.isPrimaryPressed) {
+                block(event, click)
+            }
+        }
+    }
+}
+
+//@OptIn(ExperimentalFoundationApi::class)
+//public class TapListener<in T : Any>(
+//    public val pointerMatcher: PointerMatcher,
+//    public val keyboardFilter: PointerKeyboardModifiers.() -> Boolean = { true },
+//    public val onTap: (point: ViewPoint<T>) -> Unit,
+//)

maps-kt-features/src/commonMain/kotlin/center/sciprog/maps/features/ViewConfig.kt

@@ -0,0 +1,14 @@
+package center.sciprog.maps.features
+
+import androidx.compose.ui.unit.DpSize
+
+public data class ViewConfig<T : Any>(
+    val zoomSpeed: Float = 1f / 3f,
+    val onClick: MouseListener<T>? = null,
+    val dragHandle: DragHandle<T>? = null,
+    val onViewChange: ViewPoint<T>.() -> Unit = {},
+    val onSelect: (Rectangle<T>) -> Unit = {},
+    val onCanvasSizeChange: (DpSize) -> Unit = {},
+    val zoomOnSelect: Boolean = true,
+    val zoomOnDoubleClick: Boolean = true
+)

maps-kt-features/src/commonMain/kotlin/center/sciprog/maps/features/ViewPoint.kt

@@ -0,0 +1,9 @@
+package center.sciprog.maps.features
+
+/**
+ * @param T type of coordinates used for the view point
+ */
+public interface ViewPoint<out T: Any> {
+    public val focus: T
+    public val zoom: Float
+}

maps-kt-features/src/commonMain/kotlin/center/sciprog/maps/features/compositeFeatures.kt

@@ -0,0 +1,82 @@
+package center.sciprog.maps.features
+
+import center.sciprog.attributes.Attributes
+import kotlin.jvm.JvmName
+
+
+public fun <T : Any> FeatureGroup<T>.draggableLine(
+    aId: FeatureRef<T, MarkerFeature<T>>,
+    bId: FeatureRef<T, MarkerFeature<T>>,
+    id: String? = null,
+): FeatureRef<T, LineFeature<T>> {
+    var lineId: FeatureRef<T, LineFeature<T>>? = null
+
+    fun drawLine(): FeatureRef<T, LineFeature<T>> {
+        val currentId = feature(
+            lineId?.id ?: id,
+            LineFeature(
+                space,
+                aId.resolve().center,
+                bId.resolve().center,
+                Attributes {
+                    ZAttribute(-10f)
+                    lineId?.attributes?.let { from(it) }
+                }
+            )
+        )
+        lineId = currentId
+        return currentId
+    }
+
+    aId.draggable { _, _ ->
+        drawLine()
+    }
+
+    bId.draggable { _, _ ->
+        drawLine()
+    }
+
+    return drawLine()
+}
+
+public fun <T : Any> FeatureGroup<T>.draggableMultiLine(
+    points: List<FeatureRef<T, MarkerFeature<T>>>,
+    id: String? = null,
+): FeatureRef<T, MultiLineFeature<T>> {
+    var polygonId: FeatureRef<T, MultiLineFeature<T>>? = null
+
+    fun drawLines(): FeatureRef<T, MultiLineFeature<T>> {
+        val currentId = feature(
+            polygonId?.id ?: id,
+            MultiLineFeature(
+                space,
+                points.map { it.resolve().center },
+                Attributes {
+                    ZAttribute(-10f)
+                    polygonId?.attributes?.let { from(it) }
+                }
+            )
+        )
+        polygonId = currentId
+        return currentId
+    }
+
+    points.forEach {
+        it.draggable { _, _ ->
+            drawLines()
+        }
+    }
+
+    return drawLines()
+}
+
+@JvmName("draggableMultiLineFromPoints")
+public fun <T : Any> FeatureGroup<T>.draggableMultiLine(
+    points: List<T>,
+    id: String? = null,
+): FeatureRef<T, MultiLineFeature<T>> {
+    val pointRefs = points.map {
+        circle(it)
+    }
+    return draggableMultiLine(pointRefs, id)
+}

maps-kt-features/src/commonMain/kotlin/center/sciprog/maps/features/mapFeatureAttributes.kt

@@ -0,0 +1,172 @@
+package center.sciprog.maps.features
+
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.PointerMatcher
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.PathEffect
+import androidx.compose.ui.input.pointer.PointerEvent
+import androidx.compose.ui.input.pointer.PointerKeyboardModifiers
+import center.sciprog.attributes.Attribute
+import center.sciprog.attributes.AttributesBuilder
+import center.sciprog.attributes.SetAttribute
+import center.sciprog.attributes.withAttribute
+
+public object ZAttribute : Attribute<Float>
+
+public object DraggableAttribute : Attribute<DragHandle<Any>>
+
+public object DragListenerAttribute : SetAttribute<DragListener<Any>>
+
+/**
+ * Click radius for point-like and line objects
+ */
+public object ClickRadius : Attribute<Float>
+
+public object ClickListenerAttribute : SetAttribute<MouseListener<Any>>
+
+public object HoverListenerAttribute : SetAttribute<MouseListener<Any>>
+
+//public object TapListenerAttribute : SetAttribute<TapListener<Any>>
+
+public object VisibleAttribute : Attribute<Boolean>
+
+public object ColorAttribute : Attribute<Color>
+
+
+public fun <T : Any, F : Feature<T>> FeatureRef<T, F>.color(color: Color): FeatureRef<T, F> =
+    modifyAttribute(ColorAttribute, color)
+
+
+public object ZoomRangeAttribute : Attribute<FloatRange>
+
+
+public fun <T : Any, F : Feature<T>> FeatureRef<T, F>.zoomRange(range: FloatRange): FeatureRef<T, F> =
+    modifyAttribute(ZoomRangeAttribute, range)
+
+
+public object AlphaAttribute : Attribute<Float>
+
+public fun <T : Any, F : Feature<T>> FeatureRef<T, F>.modifyAttributes(modify: AttributesBuilder.() -> Unit): FeatureRef<T, F> {
+    @Suppress("UNCHECKED_CAST")
+    parent.feature(
+        id,
+        resolve().withAttributes {
+            AttributesBuilder(this).apply(modify).build()
+        } as F
+    )
+    return this
+}
+
+public fun <T : Any, F : Feature<T>, V> FeatureRef<T, F>.modifyAttribute(
+    key: Attribute<V>,
+    value: V?,
+): FeatureRef<T, F> {
+    @Suppress("UNCHECKED_CAST")
+    parent.feature(id, resolve().withAttributes { withAttribute(key, value) } as F)
+    return this
+}
+
+/**
+ * Add drag to this feature
+ *
+ * @param constraint optional drag constraint
+ */
+@Suppress("UNCHECKED_CAST")
+public fun <T : Any, F : DraggableFeature<T>> FeatureRef<T, F>.draggable(
+    constraint: ((T) -> T)? = null,
+    listener: (PointerEvent.(from: ViewPoint<T>, to: ViewPoint<T>) -> Unit)? = null,
+): FeatureRef<T, F> = with(parent) {
+    if (attributes[DraggableAttribute] == null) {
+        val handle = DragHandle.withPrimaryButton<Any> { event, start, end ->
+            val feature = featureMap[id] as? DraggableFeature<T> ?: return@withPrimaryButton DragResult(end)
+            start as ViewPoint<T>
+            end as ViewPoint<T>
+            if (start in feature) {
+                val finalPosition = constraint?.invoke(end.focus) ?: end.focus
+                feature(id, feature.withCoordinates(finalPosition))
+                feature.attributes[DragListenerAttribute]?.forEach {
+                    it.handle(event, start, ViewPoint(finalPosition, end.zoom))
+                }
+                DragResult(ViewPoint(finalPosition, end.zoom), false)
+            } else {
+                DragResult(end, true)
+            }
+        }
+        modifyAttribute(DraggableAttribute, handle)
+    }
+
+    //Apply callback
+    if (listener != null) {
+        onDrag(listener)
+    }
+    return this@draggable
+}
+
+
+@Suppress("UNCHECKED_CAST")
+public fun <T : Any, F : DraggableFeature<T>> FeatureRef<T, F>.onDrag(
+    listener: PointerEvent.(from: ViewPoint<T>, to: ViewPoint<T>) -> Unit,
+): FeatureRef<T, F> = modifyAttributes {
+    DragListenerAttribute.add(
+        DragListener { event, from, to -> event.listener(from as ViewPoint<T>, to as ViewPoint<T>) }
+    )
+}
+
+@Suppress("UNCHECKED_CAST")
+public fun <T : Any, F : DomainFeature<T>> FeatureRef<T, F>.onClick(
+    onClick: PointerEvent.(click: ViewPoint<T>) -> Unit,
+): FeatureRef<T, F> = modifyAttributes {
+    ClickListenerAttribute.add(
+        MouseListener { event, point ->
+            event.onClick(point as ViewPoint<T>)
+        }
+    )
+}
+
+@OptIn(ExperimentalFoundationApi::class)
+@Suppress("UNCHECKED_CAST")
+public fun <T : Any, F : DomainFeature<T>> FeatureRef<T, F>.onClick(
+    pointerMatcher: PointerMatcher,
+    keyboardModifiers: PointerKeyboardModifiers.() -> Boolean = { true },
+    onClick: PointerEvent.(click: ViewPoint<T>) -> Unit,
+): FeatureRef<T, F> = modifyAttributes {
+    ClickListenerAttribute.add(
+        MouseListener { event, point ->
+            if (pointerMatcher.matches(event) && keyboardModifiers(event.keyboardModifiers)) {
+                event.onClick(point as ViewPoint<T>)
+            }
+        }
+    )
+}
+
+@Suppress("UNCHECKED_CAST")
+public fun <T : Any, F : DomainFeature<T>> FeatureRef<T, F>.onHover(
+    onClick: PointerEvent.(move: ViewPoint<T>) -> Unit,
+): FeatureRef<T, F> = modifyAttributes {
+    HoverListenerAttribute.add(
+        MouseListener { event, point -> event.onClick(point as ViewPoint<T>) }
+    )
+}
+
+//    @Suppress("UNCHECKED_CAST")
+//    @OptIn(ExperimentalFoundationApi::class)
+//    public fun <F : DomainFeature<T>> FeatureId<F>.onTap(
+//        pointerMatcher: PointerMatcher = PointerMatcher.Primary,
+//        keyboardFilter: PointerKeyboardModifiers.() -> Boolean = { true },
+//        onTap: (point: ViewPoint<T>) -> Unit,
+//    ): FeatureId<F> = modifyAttributes {
+//        TapListenerAttribute.add(
+//            TapListener(pointerMatcher, keyboardFilter) { point -> onTap(point as ViewPoint<T>) }
+//        )
+//    }
+
+
+public object PathEffectAttribute : Attribute<PathEffect>
+
+public fun <T : Any> FeatureRef<T, LineSegmentFeature<T>>.pathEffect(effect: PathEffect): FeatureRef<T, LineSegmentFeature<T>> =
+    modifyAttribute(PathEffectAttribute, effect)
+
+public object StrokeAttribute : Attribute<Float>
+
+public fun <T : Any, F : LineSegmentFeature<T>> FeatureRef<T, F>.stroke(width: Float): FeatureRef<T, F> =
+    modifyAttribute(StrokeAttribute, width)

maps-kt-features/src/commonTest/kotlin/center/sciprog/attributes/AttributesSerializationTest.kt

@@ -0,0 +1,87 @@
+package center.sciprog.attributes
+
+import kotlinx.serialization.*
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.modules.SerializersModule
+import kotlinx.serialization.modules.contextual
+import kotlinx.serialization.protobuf.ProtoBuf
+import kotlin.test.Ignore
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+internal class AttributesSerializationTest {
+
+    @Serializable
+    internal class Container(@Contextual val attributes: Attributes) {
+        override fun equals(other: Any?): Boolean = (other as? Container)?.attributes?.equals(attributes) ?: false
+        override fun hashCode(): Int = attributes.hashCode()
+
+        override fun toString(): String = attributes.toString()
+    }
+
+    internal object ContainerAttribute : SerializableAttribute<Container>("container", serializer()) {
+        override fun toString(): String = "container"
+
+    }
+
+    internal object TestAttribute : SerializableAttribute<Map<String, String>>("test", serializer()) {
+        override fun toString(): String = "test"
+    }
+
+    @Test
+    fun restoreFromJson() {
+        val json = Json {
+            serializersModule = SerializersModule {
+                contextual(AttributesSerializer(setOf(NameAttribute, TestAttribute, ContainerAttribute)))
+            }
+        }
+
+        val attributes = Attributes {
+            NameAttribute("myTest")
+            TestAttribute(mapOf("a" to "aa", "b" to "bb"))
+            ContainerAttribute(
+                Container(
+                    Attributes {
+                        TestAttribute(mapOf("a" to "aa", "b" to "bb"))
+                    }
+                )
+            )
+        }
+
+        val serialized: String = json.encodeToString(attributes)
+        println(serialized)
+
+        val restored: Attributes = json.decodeFromString(serialized)
+
+        assertEquals(attributes, restored)
+    }
+
+    @OptIn(ExperimentalSerializationApi::class)
+    @Test
+    @Ignore
+    fun restoreFromProtoBuf() {
+        val protoBuf = ProtoBuf {
+            serializersModule = SerializersModule {
+                contextual(AttributesSerializer(setOf(NameAttribute, TestAttribute, ContainerAttribute)))
+            }
+        }
+
+        val attributes = Attributes {
+            NameAttribute("myTest")
+            TestAttribute(mapOf("a" to "aa", "b" to "bb"))
+            ContainerAttribute(
+                Container(
+                    Attributes {
+                        TestAttribute(mapOf("a" to "aa", "b" to "bb"))
+                    }
+                )
+            )
+        }
+
+        val serialized = protoBuf.encodeToByteArray(attributes)
+
+        val restored: Attributes = protoBuf.decodeFromByteArray(serialized)
+
+        assertEquals(attributes, restored)
+    }
+}

maps-kt-features/src/jsMain/kotlin/center/sciprog/maps/features/FeatureFont.kt

@@ -0,0 +1,5 @@
+package center.sciprog.maps.features
+
+public actual class FeatureFont {
+    public actual var size: Float = 16f
+}

maps-kt-features/src/jvmMain/kotlin/center/sciprog/maps/compose/clickGestures.kt

@@ -0,0 +1,306 @@
+package center.sciprog.maps.compose
+
+import androidx.compose.foundation.gestures.GestureCancellationException
+import androidx.compose.foundation.gestures.PressGestureScope
+import androidx.compose.foundation.gestures.awaitEachGesture
+import androidx.compose.foundation.gestures.detectTapGestures
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.input.pointer.*
+import androidx.compose.ui.platform.ViewConfiguration
+import androidx.compose.ui.unit.Density
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.sync.Mutex
+
+/*
+ * Clone of tap gestures for mouse
+ */
+
+private val NoPressGesture: suspend PressGestureScope.(event: PointerEvent) -> Unit = { }
+
+internal fun PointerEvent.consume() = changes.forEach { it.consume() }
+
+internal val PointerEvent.firstChange get() = changes.first()
+
+public val PointerEvent.position: Offset get() = firstChange.position
+
+
+/**
+ * Detects tap, double-tap, and long press gestures and calls [onClick], [onDoubleClick], and
+ * [onLongClick], respectively, when detected. [onPress] is called when the press is detected
+ * and the [PressGestureScope.tryAwaitRelease] and [PressGestureScope.awaitRelease] can be
+ * used to detect when pointers have released or the gesture was canceled.
+ * The first pointer down and final pointer up are consumed, and in the
+ * case of long press, all changes after the long press is detected are consumed.
+ *
+ * Each function parameter receives an [Offset] representing the position relative to the containing
+ * element. The [Offset] can be outside the actual bounds of the element itself meaning the numbers
+ * can be negative or larger than the element bounds if the touch target is smaller than the
+ * [ViewConfiguration.minimumTouchTargetSize].
+ *
+ * When [onDoubleClick] is provided, the tap gesture is detected only after
+ * the [ViewConfiguration.doubleTapMinTimeMillis] has passed and [onDoubleClick] is called if the
+ * second tap is started before [ViewConfiguration.doubleTapTimeoutMillis]. If [onDoubleClick] is not
+ * provided, then [onClick] is called when the pointer up has been received.
+ *
+ * After the initial [onPress], if the pointer moves out of the input area, the position change
+ * is consumed, or another gesture consumes the down or up events, the gestures are considered
+ * canceled. That means [onDoubleClick], [onLongClick], and [onClick] will not be called after a
+ * gesture has been canceled.
+ *
+ * If the first down event is consumed somewhere else, the entire gesture will be skipped,
+ * including [onPress].
+ */
+public suspend fun PointerInputScope.detectClicks(
+    onDoubleClick: (Density.(PointerEvent) -> Unit)? = null,
+    onLongClick: (Density.(PointerEvent) -> Unit)? = null,
+    onPress: suspend PressGestureScope.(event: PointerEvent) -> Unit = NoPressGesture,
+    onClick: (Density.(PointerEvent) -> Unit)? = null,
+): Unit = coroutineScope {
+    // special signal to indicate to the sending side that it shouldn't intercept and consume
+    // cancel/up events as we're only require down events
+    val pressScope = PressGestureScopeImpl(this@detectClicks)
+
+    awaitEachGesture {
+        val down = awaitFirstDownEvent()
+        down.consume()
+
+        pressScope.reset()
+        if (onPress !== NoPressGesture) launch {
+            pressScope.onPress(down)
+        }
+        val longPressTimeout = onLongClick?.let {
+            viewConfiguration.longPressTimeoutMillis
+        } ?: (Long.MAX_VALUE / 2)
+        var upOrCancel: PointerEvent? = null
+        try {
+            // wait for first tap up or long press
+            upOrCancel = withTimeout(longPressTimeout) {
+                waitForUpOrCancellation()
+            }
+            if (upOrCancel == null) {
+                pressScope.cancel() // tap-up was canceled
+            } else {
+                upOrCancel.consume()
+                pressScope.release()
+            }
+        } catch (_: PointerEventTimeoutCancellationException) {
+            onLongClick?.invoke(this, down)
+            consumeUntilUp()
+            pressScope.release()
+        }
+
+        if (upOrCancel != null) {
+            // tap was successful.
+            if (onDoubleClick == null) {
+                onClick?.invoke(this, down) // no need to check for double-tap.
+            } else {
+                // check for second tap
+                val secondDown = awaitSecondDown(upOrCancel.firstChange)
+
+                if (secondDown == null) {
+                    onClick?.invoke(this, down) // no valid second tap started
+                } else {
+                    // Second tap down detected
+                    pressScope.reset()
+                    if (onPress !== NoPressGesture) {
+                        launch { pressScope.onPress(secondDown) }
+                    }
+
+                    try {
+                        // Might have a long second press as the second tap
+                        withTimeout(longPressTimeout) {
+                            val secondUp = waitForUpOrCancellation()
+                            if (secondUp != null) {
+                                secondUp.consume()
+                                pressScope.release()
+                                onDoubleClick(secondDown)
+                            } else {
+                                pressScope.cancel()
+                                onClick?.invoke(this, down)
+                            }
+                        }
+                    } catch (e: PointerEventTimeoutCancellationException) {
+                        // The first tap was valid, but the second tap is a long press.
+                        // notify for the first tap
+                        onClick?.invoke(this, down)
+
+                        // notify for the long press
+                        onLongClick?.invoke(this, secondDown)
+                        consumeUntilUp()
+                        pressScope.release()
+                    }
+                }
+            }
+        }
+    }
+}
+
+/**
+ * Consumes all pointer events until nothing is pressed and then returns. This method assumes
+ * that something is currently pressed.
+ */
+private suspend fun AwaitPointerEventScope.consumeUntilUp() {
+    do {
+        val event = awaitPointerEvent()
+        event.consume()
+    } while (event.changes.any { it.pressed })
+}
+
+/**
+ * Waits for [ViewConfiguration.doubleTapTimeoutMillis] for a second press event. If a
+ * second press event is received before the time-out, it is returned or `null` is returned
+ * if no second press is received.
+ */
+private suspend fun AwaitPointerEventScope.awaitSecondDown(
+    firstUp: PointerInputChange,
+): PointerEvent? = withTimeoutOrNull(viewConfiguration.doubleTapTimeoutMillis) {
+    val minUptime = firstUp.uptimeMillis + viewConfiguration.doubleTapMinTimeMillis
+    var event: PointerEvent
+    // The second tap doesn't count if it happens before DoubleTapMinTime of the first tap
+    do {
+        event = awaitFirstDownEvent()
+    } while (event.firstChange.uptimeMillis < minUptime)
+    event
+}
+
+///**
+// * Shortcut for cases when we only need to get press/click logic, as for cases without long press
+// * and double click we don't require channelling or any other complications.
+// *
+// * Each function parameter receives an [Offset] representing the position relative to the containing
+// * element. The [Offset] can be outside the actual bounds of the element itself meaning the numbers
+// * can be negative or larger than the element bounds if the touch target is smaller than the
+// * [ViewConfiguration.minimumTouchTargetSize].
+// */
+//internal suspend fun PointerInputScope.detectTapAndPress(
+//    onPress: suspend PressGestureScope.(event: PointerEvent, Offset) -> Unit = NoPressGesture,
+//    onTap: ((Offset) -> Unit)? = null,
+//) {
+//    val pressScope = PressGestureScopeImpl(this)
+//    forEachGesture {
+//        coroutineScope {
+//            pressScope.reset()
+//            awaitPointerEventScope {
+//
+//                val down = awaitFirstDownEvent()
+//
+//                down.consume()
+//
+//                if (onPress !== NoPressGesture) {
+//                    launch { pressScope.onPress(down, down.position) }
+//                }
+//
+//                val up = waitForUpOrCancellation()
+//                if (up == null) {
+//                    pressScope.cancel() // tap-up was canceled
+//                } else {
+//                    up.consume()
+//                    pressScope.release()
+//                    onTap?.invoke(up.position)
+//                }
+//            }
+//        }
+//    }
+//}
+
+/**
+ * Reads events until the first down is received. If [requireUnconsumed] is `true` and the first
+ * down is consumed in the [PointerEventPass.Main] pass, that gesture is ignored.
+ */
+internal suspend fun AwaitPointerEventScope.awaitFirstDownEvent(
+    requireUnconsumed: Boolean = true,
+): PointerEvent = awaitFirstDownEventOnPass(pass = PointerEventPass.Main, requireUnconsumed = requireUnconsumed)
+
+internal suspend fun AwaitPointerEventScope.awaitFirstDownEventOnPass(
+    pass: PointerEventPass,
+    requireUnconsumed: Boolean,
+): PointerEvent {
+    var event: PointerEvent
+    do {
+        event = awaitPointerEvent(pass)
+    } while (!event.changes.all {
+            if (requireUnconsumed) it.changedToDown() else it.changedToDownIgnoreConsumed()
+        })
+    return event
+}
+
+/**
+ * Reads events until all pointers are up or the gesture was canceled. The gesture
+ * is considered canceled when a pointer leaves the event region, a position change
+ * has been consumed or a pointer down change event was consumed in the [PointerEventPass.Main]
+ * pass. If the gesture was not canceled, the final up change is returned or `null` if the
+ * event was canceled.
+ */
+internal suspend fun AwaitPointerEventScope.waitForUpOrCancellation(): PointerEvent? {
+    while (true) {
+        val event = awaitPointerEvent(PointerEventPass.Main)
+        if (event.changes.all { it.changedToUp() }) {
+            // All pointers are up
+            return event
+        }
+
+        if (event.changes.any {
+                it.isConsumed || it.isOutOfBounds(size, extendedTouchPadding)
+            }
+        ) {
+            return null // Canceled
+        }
+
+        // Check for cancel by position consumption. We can look on the Final pass of the
+        // existing pointer event because it comes after the Main pass we checked above.
+        val consumeCheck = awaitPointerEvent(PointerEventPass.Final)
+        if (consumeCheck.changes.any { it.isConsumed }) {
+            return null
+        }
+    }
+}
+
+/**
+ * [detectTapGestures]'s implementation of [PressGestureScope].
+ */
+internal class PressGestureScopeImpl(
+    density: Density,
+) : PressGestureScope, Density by density {
+    private var isReleased = false
+    private var isCanceled = false
+    private val mutex = Mutex(locked = false)
+
+    /**
+     * Called when a gesture has been canceled.
+     */
+    fun cancel() {
+        isCanceled = true
+        mutex.unlock()
+    }
+
+    /**
+     * Called when all pointers are up.
+     */
+    fun release() {
+        isReleased = true
+        mutex.unlock()
+    }
+
+    /**
+     * Called when a new gesture has started.
+     */
+    fun reset() {
+        mutex.tryLock() // If tryAwaitRelease wasn't called, this will be unlocked.
+        isReleased = false
+        isCanceled = false
+    }
+
+    override suspend fun awaitRelease() {
+        if (!tryAwaitRelease()) {
+            throw GestureCancellationException("The press gesture was canceled.")
+        }
+    }
+
+    override suspend fun tryAwaitRelease(): Boolean {
+        if (!isReleased && !isCanceled) {
+            mutex.lock()
+        }
+        return isReleased
+    }
+}

maps-kt-features/src/jvmMain/kotlin/center/sciprog/maps/compose/mapControls.kt

@@ -0,0 +1,189 @@
+package center.sciprog.maps.compose
+
+import androidx.compose.foundation.gestures.drag
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.input.pointer.*
+import androidx.compose.ui.unit.DpOffset
+import androidx.compose.ui.unit.DpRect
+import androidx.compose.ui.unit.dp
+import center.sciprog.maps.features.*
+import kotlin.math.max
+import kotlin.math.min
+
+
+/**
+ * Create a modifier for Map/Scheme canvas controls on desktop
+ * @param features a collection of features to be rendered in descending [ZAttribute] order
+ */
+public fun <T : Any> Modifier.mapControls(
+    state: CoordinateViewScope<T>,
+    features: FeatureGroup<T>,
+): Modifier = with(state) {
+
+//    //selecting all tapabales ahead of time
+//    val allTapable = buildMap {
+//        features.forEachWithAttribute(TapListenerAttribute) { _, feature, listeners ->
+//            put(feature, listeners)
+//        }
+//    }
+
+    pointerInput(Unit) {
+        awaitPointerEventScope {
+            while (true) {
+                val event = awaitPointerEvent()
+                val coordinates = event.changes.first().position.toCoordinates(this)
+                val point = space.ViewPoint(coordinates, zoom)
+
+                if (event.type == PointerEventType.Move) {
+                    features.forEachWithAttribute(HoverListenerAttribute) { _, feature, listeners ->
+                        if (point in feature as DomainFeature) {
+                            listeners.forEach { it.handle(event, point) }
+                            return@forEachWithAttribute
+                        }
+                    }
+                }
+            }
+        }
+    }.pointerInput(Unit) {
+        detectClicks(
+            onDoubleClick = if (state.config.zoomOnDoubleClick) {
+                { event ->
+                    val invariant = event.position.toCoordinates(this)
+                    viewPoint = with(space) {
+                        viewPoint.zoomBy(
+                            if (event.buttons.isPrimaryPressed) 1f else if (event.buttons.isSecondaryPressed) -1f else 0f,
+                            invariant
+                        )
+                    }
+                }
+            } else null,
+            onClick = { event ->
+                val coordinates = event.position.toCoordinates(this)
+                val point = space.ViewPoint(coordinates, zoom)
+
+                config.onClick?.handle(
+                    event,
+                    point
+                )
+
+                features.forEachWithAttributeUntil(ClickListenerAttribute) { _, feature, listeners ->
+                    if (point in (feature as DomainFeature)) {
+                        listeners.forEach { it.handle(event, point) }
+                        false
+                    } else {
+                        true
+                    }
+                }
+            }
+        )
+    }.pointerInput(Unit) {
+        awaitPointerEventScope {
+            while (true) {
+                val event: PointerEvent = awaitPointerEvent()
+                event.changes.forEach { change ->
+
+                    if (event.type == PointerEventType.Scroll) {
+                        val (xPos, yPos) = change.position
+                        //compute invariant point of translation
+                        val invariant = DpOffset(xPos.toDp(), yPos.toDp()).toCoordinates()
+                        viewPoint = with(space) {
+                            viewPoint.zoomBy(-change.scrollDelta.y * config.zoomSpeed, invariant)
+                        }
+                        change.consume()
+                    }
+
+                    //val dragStart = change.position
+                    //val dpPos = DpOffset(dragStart.x.toDp(), dragStart.y.toDp())
+
+                    //start selection
+                    val selectionStart: Offset? =
+                        if (event.buttons.isPrimaryPressed && event.keyboardModifiers.isShiftPressed) {
+                            change.position
+                        } else {
+                            null
+                        }
+
+                    drag(change.id) { dragChange ->
+                        val dragAmount: Offset = dragChange.position - dragChange.previousPosition
+
+                        //apply drag handle and check if it prohibits the drag even propagation
+                        if (selectionStart == null) {
+                            val dragStart = space.ViewPoint(
+                                dragChange.previousPosition.toCoordinates(this),
+                                zoom
+                            )
+                            val dragEnd = space.ViewPoint(
+                                dragChange.position.toCoordinates(this),
+                                zoom
+                            )
+                            val dragResult = config.dragHandle?.handle(event, dragStart, dragEnd)
+                            if (dragResult?.handleNext == false) return@drag
+
+                            var continueAfter = true
+
+                            features.forEachWithAttributeUntil(DraggableAttribute) { _, _, handler ->
+                                handler.handle(event, dragStart, dragEnd).handleNext.also {
+                                    if (!it) continueAfter = false
+                                }
+                            }
+
+                            if (!continueAfter) return@drag
+                        }
+
+                        if (event.buttons.isPrimaryPressed) {
+                            //If selection process is started, modify the frame
+                            selectionStart?.let { start ->
+                                val offset = dragChange.position
+                                selectRect = DpRect(
+                                    min(offset.x, start.x).dp,
+                                    min(offset.y, start.y).dp,
+                                    max(offset.x, start.x).dp,
+                                    max(offset.y, start.y).dp
+                                )
+                                return@drag
+                            }
+
+//                            config.onClick(MapViewPoint(dpPos.toGeodetic(), viewPoint.zoom), event)
+                            //If no selection, drag map
+                            viewPoint = viewPoint.moveBy(
+                                -dragAmount.x.toDp(),
+                                dragAmount.y.toDp()
+                            )
+
+                        }
+                    }
+
+                    // evaluate selection
+                    selectRect?.let { rect ->
+                        //Use selection override if it is defined
+                        val coordinateRect = space.Rectangle(
+                            rect.topLeft.toCoordinates(),
+                            rect.bottomRight.toCoordinates()
+                        )
+                        config.onSelect(coordinateRect)
+                        if (config.zoomOnSelect) {
+                            viewPoint = computeViewPoint(coordinateRect)
+                        }
+                        selectRect = null
+                    }
+                }
+            }
+        }
+    }
+}
+
+/*
+.pointerInput(Unit) {
+        allTapable.forEach { (feature, listeners) ->
+            listeners.forEach { listener ->
+                detectTapGestures(listener.pointerMatcher, listener.keyboardFilter) { offset ->
+                    val point = space.ViewPoint(offset.toCoordinates(this@pointerInput), zoom)
+                    if (point in feature as DomainFeature) {
+                        listener.onTap(point)
+                    }
+                }
+            }
+        }
+    }
+ */

maps-kt-features/src/jvmMain/kotlin/center/sciprog/maps/features/FeatureFont.kt

@@ -0,0 +1,5 @@
+package center.sciprog.maps.features
+
+import org.jetbrains.skia.Font
+
+public actual typealias FeatureFont = Font

maps-kt-features/src/jvmMain/kotlin/center/sciprog/maps/features/drawFeature.kt

@@ -0,0 +1,198 @@
+package center.sciprog.maps.features
+
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.geometry.Size
+import androidx.compose.ui.graphics.*
+import androidx.compose.ui.graphics.drawscope.*
+import androidx.compose.ui.graphics.painter.Painter
+import center.sciprog.attributes.plus
+import org.jetbrains.skia.Font
+import org.jetbrains.skia.Paint
+import space.kscience.kmath.PerformancePitfall
+import space.kscience.kmath.geometry.degrees
+
+
+internal fun Color.toPaint(): Paint = Paint().apply {
+    isAntiAlias = true
+    color = toArgb()
+}
+
+public fun <T : Any> DrawScope.drawFeature(
+    state: CoordinateViewScope<T>,
+    painterCache: Map<PainterFeature<T>, Painter>,
+    feature: Feature<T>,
+): Unit = with(state) {
+    val color = feature.color ?: Color.Red
+    val alpha = feature.attributes[AlphaAttribute] ?: 1f
+    fun T.toOffset(): Offset = toOffset(this@drawFeature)
+
+    when (feature) {
+        is FeatureSelector -> drawFeature(state, painterCache, feature.selector(state.zoom))
+        is CircleFeature -> drawCircle(
+            color,
+            feature.radius.toPx(),
+            center = feature.center.toOffset()
+        )
+
+        is RectangleFeature -> drawRect(
+            color,
+            topLeft = feature.center.toOffset() - Offset(
+                feature.size.width.toPx() / 2,
+                feature.size.height.toPx() / 2
+            ),
+            size = feature.size.toSize()
+        )
+
+        is LineFeature -> drawLine(
+            color,
+            feature.a.toOffset(),
+            feature.b.toOffset(),
+            strokeWidth = feature.attributes[StrokeAttribute] ?: Stroke.HairlineWidth,
+            pathEffect = feature.attributes[PathEffectAttribute]
+        )
+
+        is ArcFeature -> {
+            val dpRect = feature.oval.toDpRect().toRect()
+
+            val size = Size(dpRect.width, dpRect.height)
+
+            drawArc(
+                color = color,
+                startAngle = (feature.startAngle.degrees).toFloat(),
+                sweepAngle = (feature.arcLength.degrees).toFloat(),
+                useCenter = false,
+                topLeft = dpRect.topLeft,
+                size = size,
+                style = Stroke(),
+                alpha = alpha
+            )
+
+        }
+
+        is BitmapIconFeature -> drawImage(feature.image, feature.center.toOffset())
+
+        is VectorIconFeature -> {
+            val offset = feature.center.toOffset()
+            val size = feature.size.toSize()
+            translate(offset.x - size.width / 2, offset.y - size.height / 2) {
+                with(painterCache[feature]!!) {
+                    draw(size)
+                }
+            }
+        }
+
+        is TextFeature -> drawIntoCanvas { canvas ->
+            val offset = feature.position.toOffset()
+            canvas.nativeCanvas.drawString(
+                feature.text,
+                offset.x + 5,
+                offset.y - 5,
+                Font().apply(feature.fontConfig),
+                (feature.color ?: Color.Black).toPaint()
+            )
+        }
+
+        is DrawFeature -> {
+            val offset = feature.position.toOffset()
+            translate(offset.x, offset.y) {
+                feature.drawFeature(this)
+            }
+        }
+
+        is FeatureGroup -> {
+            feature.featureMap.values.forEach {
+                drawFeature(state, painterCache, it.withAttributes {
+                    feature.attributes + this
+                })
+            }
+        }
+
+        is PathFeature -> {
+            TODO("MapPathFeature not implemented")
+//                    val offset = feature.rectangle.center.toOffset() - feature.targetRect.center
+//                    translate(offset.x, offset.y) {
+//                        sca
+//                        drawPath(feature.path, brush = feature.brush, style = feature.style)
+//                    }
+        }
+
+        is PointsFeature -> {
+            val points = feature.points.map { it.toOffset() }
+            drawPoints(
+                points = points,
+                color = color,
+                strokeWidth = feature.attributes[StrokeAttribute] ?: Stroke.HairlineWidth,
+                pointMode = PointMode.Points,
+                pathEffect = feature.attributes[PathEffectAttribute],
+                alpha = alpha
+            )
+        }
+
+        is MultiLineFeature -> {
+            val points = feature.points.map { it.toOffset() }
+            drawPoints(
+                points = points,
+                color = color,
+                strokeWidth = feature.attributes[StrokeAttribute] ?: Stroke.HairlineWidth,
+                pointMode = PointMode.Polygon,
+                pathEffect = feature.attributes[PathEffectAttribute],
+                alpha = alpha
+            )
+        }
+
+        is PolygonFeature -> {
+            val points = feature.points.map { it.toOffset() }
+            val last = points.last()
+            val polygonPath = Path()
+            polygonPath.moveTo(last.x, last.y)
+            for ((x, y) in points) {
+                polygonPath.lineTo(x, y)
+            }
+            drawPath(
+                path = polygonPath,
+                color = color,
+                alpha = alpha
+            )
+        }
+
+        is ScalableImageFeature -> {
+            val rect = feature.rectangle.toDpRect().toRect()
+            val offset = rect.topLeft
+
+            translate(offset.x, offset.y) {
+                with(painterCache[feature]!!) {
+                    draw(rect.size)
+                }
+            }
+        }
+
+        is PixelMapFeature -> {
+            val rect = feature.rectangle.toDpRect().toRect()
+            val xStep = rect.size.width / feature.pixelMap.shape[0]
+            val yStep = rect.size.height / feature.pixelMap.shape[1]
+            val pixelSize = Size(xStep, yStep)
+            //TODO add re-clasterization for small pixel scales
+            val offset = rect.topLeft
+            translate(offset.x, offset.y) {
+                @OptIn(PerformancePitfall::class)
+                feature.pixelMap.elements().forEach { (index, color: Color?) ->
+                    val (i, j) = index
+                    if (color != null) {
+                        drawRect(
+                            color,
+                            topLeft = Offset(
+                                x = i * xStep,
+                                y = rect.height - j * yStep
+                            ),
+                            size = pixelSize
+                        )
+                    }
+                }
+            }
+        }
+
+        else -> {
+            //logger.error { "Unrecognized feature type: ${feature::class}" }
+        }
+    }
+}

maps-kt-geojson/README.md

@@ -0,0 +1,32 @@
+# Module maps-kt-geojson
+
+
+
+## Usage
+
+## Artifact:
+
+The Maven coordinates of this project are `center.sciprog:maps-kt-geojson:0.2.2`.
+
+**Gradle Groovy:**
+```groovy
+repositories {
+    maven { url 'https://repo.kotlin.link' }
+    mavenCentral()
+}
+
+dependencies {
+    implementation 'center.sciprog:maps-kt-geojson:0.2.2'
+}
+```
+**Gradle Kotlin DSL:**
+```kotlin
+repositories {
+    maven("https://repo.kotlin.link")
+    mavenCentral()
+}
+
+dependencies {
+    implementation("center.sciprog:maps-kt-geojson:0.2.2")
+}
+```

maps-kt-geojson/api/maps-kt-geojson.api

@@ -0,0 +1,224 @@
+public abstract interface class center/sciprog/maps/geojson/GeoJson {
+	public static final field Companion Lcenter/sciprog/maps/geojson/GeoJson$Companion;
+	public static final field PROPERTIES_KEY Ljava/lang/String;
+	public static final field TYPE_KEY Ljava/lang/String;
+	public abstract fun getJson ()Lkotlinx/serialization/json/JsonObject;
+	public fun getType ()Ljava/lang/String;
+}
+
+public final class center/sciprog/maps/geojson/GeoJson$Companion {
+	public static final field PROPERTIES_KEY Ljava/lang/String;
+	public static final field TYPE_KEY Ljava/lang/String;
+	public final fun serializer ()Lkotlinx/serialization/KSerializer;
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonFeature : center/sciprog/maps/geojson/GeoJson {
+	public static final field Companion Lcenter/sciprog/maps/geojson/GeoJsonFeature$Companion;
+	public static final field GEOMETRY_KEY Ljava/lang/String;
+	public static final synthetic fun box-impl (Lkotlinx/serialization/json/JsonObject;)Lcenter/sciprog/maps/geojson/GeoJsonFeature;
+	public static fun constructor-impl (Lkotlinx/serialization/json/JsonObject;)Lkotlinx/serialization/json/JsonObject;
+	public fun equals (Ljava/lang/Object;)Z
+	public static fun equals-impl (Lkotlinx/serialization/json/JsonObject;Ljava/lang/Object;)Z
+	public static final fun equals-impl0 (Lkotlinx/serialization/json/JsonObject;Lkotlinx/serialization/json/JsonObject;)Z
+	public static final fun getGeometry-impl (Lkotlinx/serialization/json/JsonObject;)Lcenter/sciprog/maps/geojson/GeoJsonGeometry;
+	public fun getJson ()Lkotlinx/serialization/json/JsonObject;
+	public static final fun getProperties-impl (Lkotlinx/serialization/json/JsonObject;)Lkotlinx/serialization/json/JsonObject;
+	public fun hashCode ()I
+	public static fun hashCode-impl (Lkotlinx/serialization/json/JsonObject;)I
+	public fun toString ()Ljava/lang/String;
+	public static fun toString-impl (Lkotlinx/serialization/json/JsonObject;)Ljava/lang/String;
+	public final synthetic fun unbox-impl ()Lkotlinx/serialization/json/JsonObject;
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonFeature$Companion {
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonFeatureCollection : center/sciprog/maps/geojson/GeoJson, java/lang/Iterable, kotlin/jvm/internal/markers/KMappedMarker {
+	public static final field Companion Lcenter/sciprog/maps/geojson/GeoJsonFeatureCollection$Companion;
+	public static final field FEATURES_KEY Ljava/lang/String;
+	public static final synthetic fun box-impl (Lkotlinx/serialization/json/JsonObject;)Lcenter/sciprog/maps/geojson/GeoJsonFeatureCollection;
+	public static fun constructor-impl (Lkotlinx/serialization/json/JsonObject;)Lkotlinx/serialization/json/JsonObject;
+	public fun equals (Ljava/lang/Object;)Z
+	public static fun equals-impl (Lkotlinx/serialization/json/JsonObject;Ljava/lang/Object;)Z
+	public static final fun equals-impl0 (Lkotlinx/serialization/json/JsonObject;Lkotlinx/serialization/json/JsonObject;)Z
+	public static final fun getFeatures-impl (Lkotlinx/serialization/json/JsonObject;)Ljava/util/List;
+	public fun getJson ()Lkotlinx/serialization/json/JsonObject;
+	public static final fun getProperties-impl (Lkotlinx/serialization/json/JsonObject;)Lkotlinx/serialization/json/JsonObject;
+	public fun hashCode ()I
+	public static fun hashCode-impl (Lkotlinx/serialization/json/JsonObject;)I
+	public fun iterator ()Ljava/util/Iterator;
+	public static fun iterator-impl (Lkotlinx/serialization/json/JsonObject;)Ljava/util/Iterator;
+	public fun toString ()Ljava/lang/String;
+	public static fun toString-impl (Lkotlinx/serialization/json/JsonObject;)Ljava/lang/String;
+	public final synthetic fun unbox-impl ()Lkotlinx/serialization/json/JsonObject;
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonFeatureCollection$Companion {
+	public final fun parse-oOQ2h9Q (Ljava/lang/String;)Lkotlinx/serialization/json/JsonObject;
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonFeatureJvmKt {
+	public static final fun geoJson (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/net/URL;Ljava/lang/String;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun geoJson$default (Lcenter/sciprog/maps/features/FeatureGroup;Ljava/net/URL;Ljava/lang/String;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+}
+
+public abstract interface class center/sciprog/maps/geojson/GeoJsonGeometry : center/sciprog/maps/geojson/GeoJson {
+	public static final field COORDINATES_KEY Ljava/lang/String;
+	public static final field Companion Lcenter/sciprog/maps/geojson/GeoJsonGeometry$Companion;
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonGeometry$Companion {
+	public static final field COORDINATES_KEY Ljava/lang/String;
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonGeometryCollection : center/sciprog/maps/geojson/GeoJsonGeometry {
+	public static final synthetic fun box-impl (Lkotlinx/serialization/json/JsonObject;)Lcenter/sciprog/maps/geojson/GeoJsonGeometryCollection;
+	public static fun constructor-impl (Lkotlinx/serialization/json/JsonObject;)Lkotlinx/serialization/json/JsonObject;
+	public fun equals (Ljava/lang/Object;)Z
+	public static fun equals-impl (Lkotlinx/serialization/json/JsonObject;Ljava/lang/Object;)Z
+	public static final fun equals-impl0 (Lkotlinx/serialization/json/JsonObject;Lkotlinx/serialization/json/JsonObject;)Z
+	public static final fun getGeometries-impl (Lkotlinx/serialization/json/JsonObject;)Ljava/util/List;
+	public fun getJson ()Lkotlinx/serialization/json/JsonObject;
+	public fun hashCode ()I
+	public static fun hashCode-impl (Lkotlinx/serialization/json/JsonObject;)I
+	public fun toString ()Ljava/lang/String;
+	public static fun toString-impl (Lkotlinx/serialization/json/JsonObject;)Ljava/lang/String;
+	public final synthetic fun unbox-impl ()Lkotlinx/serialization/json/JsonObject;
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonGeometryKt {
+	public static final fun GeoJsonGeometry (Lkotlinx/serialization/json/JsonObject;)Lcenter/sciprog/maps/geojson/GeoJsonGeometry;
+	public static final fun GeoJsonGeometryCollection (Ljava/util/List;Lkotlin/jvm/functions/Function1;)Lkotlinx/serialization/json/JsonObject;
+	public static final fun GeoJsonLineString (Ljava/util/List;Lkotlin/jvm/functions/Function1;)Lkotlinx/serialization/json/JsonObject;
+	public static synthetic fun GeoJsonLineString$default (Ljava/util/List;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonObject;
+	public static final fun GeoJsonMultiLineString (Ljava/util/List;Lkotlin/jvm/functions/Function1;)Lkotlinx/serialization/json/JsonObject;
+	public static synthetic fun GeoJsonMultiLineString$default (Ljava/util/List;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonObject;
+	public static final fun GeoJsonMultiPoint (Ljava/util/List;Lkotlin/jvm/functions/Function1;)Lkotlinx/serialization/json/JsonObject;
+	public static synthetic fun GeoJsonMultiPoint$default (Ljava/util/List;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonObject;
+	public static final fun GeoJsonMultiPolygon (Ljava/util/List;Lkotlin/jvm/functions/Function1;)Lkotlinx/serialization/json/JsonObject;
+	public static final fun GeoJsonPoint (Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;Lkotlin/jvm/functions/Function1;)Lkotlinx/serialization/json/JsonObject;
+	public static synthetic fun GeoJsonPoint$default (Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonObject;
+	public static final fun GeoJsonPolygon (Ljava/util/List;Lkotlin/jvm/functions/Function1;)Lkotlinx/serialization/json/JsonObject;
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonKt {
+	public static final fun GeoJson (Lkotlinx/serialization/json/JsonObject;)Lcenter/sciprog/maps/geojson/GeoJson;
+	public static final fun GeoJsonFeature (Lcenter/sciprog/maps/geojson/GeoJsonGeometry;Lkotlinx/serialization/json/JsonObject;Lkotlin/jvm/functions/Function1;)Lkotlinx/serialization/json/JsonObject;
+	public static synthetic fun GeoJsonFeature$default (Lcenter/sciprog/maps/geojson/GeoJsonGeometry;Lkotlinx/serialization/json/JsonObject;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonObject;
+	public static final fun GeoJsonFeatureCollection (Ljava/util/List;Lkotlinx/serialization/json/JsonObject;Lkotlin/jvm/functions/Function1;)Lkotlinx/serialization/json/JsonObject;
+	public static synthetic fun GeoJsonFeatureCollection$default (Ljava/util/List;Lkotlinx/serialization/json/JsonObject;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonObject;
+	public static final fun getProperty-c0BrZC0 (Lkotlinx/serialization/json/JsonObject;Ljava/lang/String;)Lkotlinx/serialization/json/JsonElement;
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonLineString : center/sciprog/maps/geojson/GeoJsonGeometry {
+	public static final synthetic fun box-impl (Lkotlinx/serialization/json/JsonObject;)Lcenter/sciprog/maps/geojson/GeoJsonLineString;
+	public static fun constructor-impl (Lkotlinx/serialization/json/JsonObject;)Lkotlinx/serialization/json/JsonObject;
+	public fun equals (Ljava/lang/Object;)Z
+	public static fun equals-impl (Lkotlinx/serialization/json/JsonObject;Ljava/lang/Object;)Z
+	public static final fun equals-impl0 (Lkotlinx/serialization/json/JsonObject;Lkotlinx/serialization/json/JsonObject;)Z
+	public static final fun getCoordinates-impl (Lkotlinx/serialization/json/JsonObject;)Ljava/util/List;
+	public fun getJson ()Lkotlinx/serialization/json/JsonObject;
+	public fun hashCode ()I
+	public static fun hashCode-impl (Lkotlinx/serialization/json/JsonObject;)I
+	public fun toString ()Ljava/lang/String;
+	public static fun toString-impl (Lkotlinx/serialization/json/JsonObject;)Ljava/lang/String;
+	public final synthetic fun unbox-impl ()Lkotlinx/serialization/json/JsonObject;
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonMultiLineString : center/sciprog/maps/geojson/GeoJsonGeometry {
+	public static final synthetic fun box-impl (Lkotlinx/serialization/json/JsonObject;)Lcenter/sciprog/maps/geojson/GeoJsonMultiLineString;
+	public static fun constructor-impl (Lkotlinx/serialization/json/JsonObject;)Lkotlinx/serialization/json/JsonObject;
+	public fun equals (Ljava/lang/Object;)Z
+	public static fun equals-impl (Lkotlinx/serialization/json/JsonObject;Ljava/lang/Object;)Z
+	public static final fun equals-impl0 (Lkotlinx/serialization/json/JsonObject;Lkotlinx/serialization/json/JsonObject;)Z
+	public static final fun getCoordinates-impl (Lkotlinx/serialization/json/JsonObject;)Ljava/util/List;
+	public fun getJson ()Lkotlinx/serialization/json/JsonObject;
+	public fun hashCode ()I
+	public static fun hashCode-impl (Lkotlinx/serialization/json/JsonObject;)I
+	public fun toString ()Ljava/lang/String;
+	public static fun toString-impl (Lkotlinx/serialization/json/JsonObject;)Ljava/lang/String;
+	public final synthetic fun unbox-impl ()Lkotlinx/serialization/json/JsonObject;
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonMultiPoint : center/sciprog/maps/geojson/GeoJsonGeometry {
+	public static final synthetic fun box-impl (Lkotlinx/serialization/json/JsonObject;)Lcenter/sciprog/maps/geojson/GeoJsonMultiPoint;
+	public static fun constructor-impl (Lkotlinx/serialization/json/JsonObject;)Lkotlinx/serialization/json/JsonObject;
+	public fun equals (Ljava/lang/Object;)Z
+	public static fun equals-impl (Lkotlinx/serialization/json/JsonObject;Ljava/lang/Object;)Z
+	public static final fun equals-impl0 (Lkotlinx/serialization/json/JsonObject;Lkotlinx/serialization/json/JsonObject;)Z
+	public static final fun getCoordinates-impl (Lkotlinx/serialization/json/JsonObject;)Ljava/util/List;
+	public fun getJson ()Lkotlinx/serialization/json/JsonObject;
+	public fun hashCode ()I
+	public static fun hashCode-impl (Lkotlinx/serialization/json/JsonObject;)I
+	public fun toString ()Ljava/lang/String;
+	public static fun toString-impl (Lkotlinx/serialization/json/JsonObject;)Ljava/lang/String;
+	public final synthetic fun unbox-impl ()Lkotlinx/serialization/json/JsonObject;
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonMultiPolygon : center/sciprog/maps/geojson/GeoJsonGeometry {
+	public static final synthetic fun box-impl (Lkotlinx/serialization/json/JsonObject;)Lcenter/sciprog/maps/geojson/GeoJsonMultiPolygon;
+	public static fun constructor-impl (Lkotlinx/serialization/json/JsonObject;)Lkotlinx/serialization/json/JsonObject;
+	public fun equals (Ljava/lang/Object;)Z
+	public static fun equals-impl (Lkotlinx/serialization/json/JsonObject;Ljava/lang/Object;)Z
+	public static final fun equals-impl0 (Lkotlinx/serialization/json/JsonObject;Lkotlinx/serialization/json/JsonObject;)Z
+	public static final fun getCoordinates-impl (Lkotlinx/serialization/json/JsonObject;)Ljava/util/List;
+	public fun getJson ()Lkotlinx/serialization/json/JsonObject;
+	public fun hashCode ()I
+	public static fun hashCode-impl (Lkotlinx/serialization/json/JsonObject;)I
+	public fun toString ()Ljava/lang/String;
+	public static fun toString-impl (Lkotlinx/serialization/json/JsonObject;)Ljava/lang/String;
+	public final synthetic fun unbox-impl ()Lkotlinx/serialization/json/JsonObject;
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonPoint : center/sciprog/maps/geojson/GeoJsonGeometry {
+	public static final synthetic fun box-impl (Lkotlinx/serialization/json/JsonObject;)Lcenter/sciprog/maps/geojson/GeoJsonPoint;
+	public static fun constructor-impl (Lkotlinx/serialization/json/JsonObject;)Lkotlinx/serialization/json/JsonObject;
+	public fun equals (Ljava/lang/Object;)Z
+	public static fun equals-impl (Lkotlinx/serialization/json/JsonObject;Ljava/lang/Object;)Z
+	public static final fun equals-impl0 (Lkotlinx/serialization/json/JsonObject;Lkotlinx/serialization/json/JsonObject;)Z
+	public static final fun getCoordinates-impl (Lkotlinx/serialization/json/JsonObject;)Lcenter/sciprog/maps/coordinates/GeodeticMapCoordinates;
+	public fun getJson ()Lkotlinx/serialization/json/JsonObject;
+	public fun hashCode ()I
+	public static fun hashCode-impl (Lkotlinx/serialization/json/JsonObject;)I
+	public fun toString ()Ljava/lang/String;
+	public static fun toString-impl (Lkotlinx/serialization/json/JsonObject;)Ljava/lang/String;
+	public final synthetic fun unbox-impl ()Lkotlinx/serialization/json/JsonObject;
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonPolygon : center/sciprog/maps/geojson/GeoJsonGeometry {
+	public static final synthetic fun box-impl (Lkotlinx/serialization/json/JsonObject;)Lcenter/sciprog/maps/geojson/GeoJsonPolygon;
+	public static fun constructor-impl (Lkotlinx/serialization/json/JsonObject;)Lkotlinx/serialization/json/JsonObject;
+	public fun equals (Ljava/lang/Object;)Z
+	public static fun equals-impl (Lkotlinx/serialization/json/JsonObject;Ljava/lang/Object;)Z
+	public static final fun equals-impl0 (Lkotlinx/serialization/json/JsonObject;Lkotlinx/serialization/json/JsonObject;)Z
+	public static final fun getCoordinates-impl (Lkotlinx/serialization/json/JsonObject;)Ljava/util/List;
+	public fun getJson ()Lkotlinx/serialization/json/JsonObject;
+	public fun hashCode ()I
+	public static fun hashCode-impl (Lkotlinx/serialization/json/JsonObject;)I
+	public fun toString ()Ljava/lang/String;
+	public static fun toString-impl (Lkotlinx/serialization/json/JsonObject;)Ljava/lang/String;
+	public final synthetic fun unbox-impl ()Lkotlinx/serialization/json/JsonObject;
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonPropertiesAttribute : center/sciprog/attributes/SerializableAttribute {
+	public static final field INSTANCE Lcenter/sciprog/maps/geojson/GeoJsonPropertiesAttribute;
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonSerializer : kotlinx/serialization/KSerializer {
+	public static final field INSTANCE Lcenter/sciprog/maps/geojson/GeoJsonSerializer;
+	public fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lcenter/sciprog/maps/geojson/GeoJson;
+	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
+	public fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
+	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lcenter/sciprog/maps/geojson/GeoJson;)V
+	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
+}
+
+public final class center/sciprog/maps/geojson/GeoJsonToMapKt {
+	public static final fun geoJson (Lcenter/sciprog/maps/features/FeatureGroup;Lcenter/sciprog/maps/geojson/GeoJson;Ljava/lang/String;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun geoJson$default (Lcenter/sciprog/maps/features/FeatureGroup;Lcenter/sciprog/maps/geojson/GeoJson;Ljava/lang/String;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun geoJsonFeature-wsmmyRA (Lcenter/sciprog/maps/features/FeatureGroup;Lkotlinx/serialization/json/JsonObject;Ljava/lang/String;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun geoJsonFeature-wsmmyRA$default (Lcenter/sciprog/maps/features/FeatureGroup;Lkotlinx/serialization/json/JsonObject;Ljava/lang/String;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static final fun geoJsonGeometry (Lcenter/sciprog/maps/features/FeatureGroup;Lcenter/sciprog/maps/geojson/GeoJsonGeometry;Ljava/lang/String;)Lcenter/sciprog/maps/features/FeatureRef;
+	public static synthetic fun geoJsonGeometry$default (Lcenter/sciprog/maps/features/FeatureGroup;Lcenter/sciprog/maps/geojson/GeoJsonGeometry;Ljava/lang/String;ILjava/lang/Object;)Lcenter/sciprog/maps/features/FeatureRef;
+}
+

maps-kt-geojson/build.gradle.kts

@@ -0,0 +1,18 @@
+plugins {
+    id("space.kscience.gradle.mpp")
+    `maven-publish`
+}
+
+
+kscience{
+    jvm()
+    js()
+    useSerialization {
+        json()
+    }
+    dependencies{
+        api(projects.mapsKtCore)
+        api(projects.mapsKtFeatures)
+        api(spclibs.kotlinx.serialization.json)
+    }
+}

maps-kt-geojson/src/commonMain/kotlin/center/sciprog/maps/geojson/GeoJson.kt

@@ -0,0 +1,111 @@
+package center.sciprog.maps.geojson
+
+import center.sciprog.maps.geojson.GeoJson.Companion.PROPERTIES_KEY
+import center.sciprog.maps.geojson.GeoJson.Companion.TYPE_KEY
+import center.sciprog.maps.geojson.GeoJsonFeatureCollection.Companion.FEATURES_KEY
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.*
+import kotlin.jvm.JvmInline
+
+/**
+ * A utility class to work with GeoJson (https://geojson.org/)
+ */
+@Serializable(GeoJsonSerializer::class)
+public sealed interface GeoJson {
+    public val json: JsonObject
+    public val type: String get() = json[TYPE_KEY]?.jsonPrimitive?.content ?: error("Not a GeoJson")
+
+    public companion object {
+        public const val TYPE_KEY: String = "type"
+        public const val PROPERTIES_KEY: String = "properties"
+    }
+}
+
+@JvmInline
+public value class GeoJsonFeature(override val json: JsonObject) : GeoJson {
+    init {
+        require(type == "Feature") { "Not a GeoJson Feature" }
+    }
+
+    public val properties: JsonObject? get() = json[PROPERTIES_KEY]?.jsonObject
+
+    public val geometry: GeoJsonGeometry? get() = json[GEOMETRY_KEY]?.jsonObject?.let { GeoJsonGeometry(it) }
+
+    public companion object {
+        public const val GEOMETRY_KEY: String = "geometry"
+    }
+}
+
+/**
+ * A builder function for [GeoJsonFeature]
+ */
+public fun GeoJsonFeature(
+    geometry: GeoJsonGeometry?,
+    properties: JsonObject? = null,
+    builder: JsonObjectBuilder.() -> Unit = {},
+): GeoJsonFeature = GeoJsonFeature(
+    buildJsonObject {
+        put(TYPE_KEY, "Feature")
+        geometry?.json?.let { put(GeoJsonFeature.GEOMETRY_KEY, it) }
+        properties?.let { put(PROPERTIES_KEY, it) }
+
+        builder()
+    }
+)
+
+public fun GeoJsonFeature.getProperty(key: String): JsonElement? = json[key] ?: properties?.get(key)
+
+@JvmInline
+public value class GeoJsonFeatureCollection(override val json: JsonObject) : GeoJson, Iterable<GeoJsonFeature> {
+    init {
+        require(type == "FeatureCollection") { "Not a GeoJson FeatureCollection" }
+    }
+
+    public val properties: JsonObject? get() = json[PROPERTIES_KEY]?.jsonObject
+
+    public val features: List<GeoJsonFeature>
+        get() = json[FEATURES_KEY]?.jsonArray?.map {
+            GeoJsonFeature(it.jsonObject)
+        } ?: error("Features not defined in GeoJson features collection")
+
+    override fun iterator(): Iterator<GeoJsonFeature> = features.iterator()
+
+    public companion object {
+
+        public const val FEATURES_KEY: String = "features"
+        public fun parse(string: String): GeoJsonFeatureCollection = GeoJsonFeatureCollection(
+            Json.parseToJsonElement(string).jsonObject
+        )
+    }
+}
+
+/**
+ * A builder for [GeoJsonFeatureCollection]
+ */
+public fun GeoJsonFeatureCollection(
+    features: List<GeoJsonFeature>,
+    properties: JsonObject? = null,
+    builder: JsonObjectBuilder.() -> Unit = {},
+): GeoJsonFeatureCollection = GeoJsonFeatureCollection(
+    buildJsonObject {
+        put(TYPE_KEY, "FeatureCollection")
+        putJsonArray(FEATURES_KEY) {
+            features.forEach {
+                add(it.json)
+            }
+        }
+        properties?.let { put(PROPERTIES_KEY, it) }
+        builder()
+    }
+)
+
+
+/**
+ * Generic Json to GeoJson converter
+ */
+public fun GeoJson(json: JsonObject): GeoJson =
+    when (json[TYPE_KEY]?.jsonPrimitive?.contentOrNull ?: error("Not a GeoJson")) {
+        "Feature" -> GeoJsonFeature(json)
+        "FeatureCollection" -> GeoJsonFeatureCollection(json)
+        else -> GeoJsonGeometry(json)
+    }

maps-kt-geojson/src/commonMain/kotlin/center/sciprog/maps/geojson/GeoJsonGeometry.kt

@@ -0,0 +1,226 @@
+package center.sciprog.maps.geojson
+
+import center.sciprog.maps.coordinates.Gmc
+import center.sciprog.maps.coordinates.meters
+import center.sciprog.maps.geojson.GeoJsonGeometry.Companion.COORDINATES_KEY
+import kotlinx.serialization.json.*
+import space.kscience.kmath.geometry.degrees
+import kotlin.jvm.JvmInline
+
+public sealed interface GeoJsonGeometry : GeoJson {
+    public companion object {
+        public const val COORDINATES_KEY: String = "coordinates"
+    }
+}
+
+public fun GeoJsonGeometry(json: JsonObject): GeoJsonGeometry {
+    return when (val type = json[GeoJson.TYPE_KEY]?.jsonPrimitive?.content ?: error("Not a GeoJson object")) {
+        "Point" -> GeoJsonPoint(json)
+        "MultiPoint" -> GeoJsonMultiPoint(json)
+        "LineString" -> GeoJsonLineString(json)
+        "MultiLineString" -> GeoJsonMultiLineString(json)
+        "Polygon" -> GeoJsonPolygon(json)
+        "MultiPolygon" -> GeoJsonMultiPolygon(json)
+        "GeometryCollection" -> GeoJsonGeometryCollection(json)
+        else -> error("Type '$type' is not recognised as a geometry type")
+    }
+}
+
+internal fun JsonElement.toGmc() = jsonArray.run {
+    Gmc.ofDegrees(
+        get(1).jsonPrimitive.double,
+        get(0).jsonPrimitive.double,
+        getOrNull(2)?.jsonPrimitive?.doubleOrNull?.meters
+    )
+}
+
+internal fun Gmc.toJsonArray(): JsonArray = buildJsonArray {
+    add(longitude.degrees)
+    add(latitude.degrees)
+    elevation?.let {
+        add(it.meters)
+    }
+}
+
+private fun List<Gmc>.listToJsonArray(): JsonArray = buildJsonArray {
+    forEach {
+        add(it.toJsonArray())
+    }
+}
+
+private fun List<List<Gmc>>.listOfListsToJsonArray(): JsonArray = buildJsonArray {
+    forEach {
+        add(it.listToJsonArray())
+    }
+}
+
+@JvmInline
+public value class GeoJsonPoint(override val json: JsonObject) : GeoJsonGeometry {
+    init {
+        require(type == "Point") { "Not a GeoJson Point geometry" }
+    }
+
+    public val coordinates: Gmc
+        get() = json[COORDINATES_KEY]?.toGmc()
+            ?: error("Coordinates are not provided")
+}
+
+public fun GeoJsonPoint(
+    coordinates: Gmc,
+    modification: JsonObjectBuilder.() -> Unit = {},
+): GeoJsonPoint = GeoJsonPoint(
+    buildJsonObject {
+        put(GeoJson.TYPE_KEY, "Point")
+        put(COORDINATES_KEY, coordinates.toJsonArray())
+        modification()
+    }
+)
+
+@JvmInline
+public value class GeoJsonMultiPoint(override val json: JsonObject) : GeoJsonGeometry {
+    init {
+        require(type == "MultiPoint") { "Not a GeoJson MultiPoint geometry" }
+    }
+
+    public val coordinates: List<Gmc>
+        get() = json[COORDINATES_KEY]?.jsonArray
+            ?.map { it.toGmc() }
+            ?: error("Coordinates are not provided")
+}
+
+public fun GeoJsonMultiPoint(
+    coordinates: List<Gmc>,
+    modification: JsonObjectBuilder.() -> Unit = {},
+): GeoJsonMultiPoint = GeoJsonMultiPoint(
+    buildJsonObject {
+        put(GeoJson.TYPE_KEY, "MultiPoint")
+        put(COORDINATES_KEY, coordinates.listToJsonArray())
+        modification()
+    }
+)
+
+@JvmInline
+public value class GeoJsonLineString(override val json: JsonObject) : GeoJsonGeometry {
+    init {
+        require(type == "LineString") { "Not a GeoJson LineString geometry" }
+    }
+
+    public val coordinates: List<Gmc>
+        get() = json[COORDINATES_KEY]?.jsonArray
+            ?.map { it.toGmc() }
+            ?: error("Coordinates are not provided")
+}
+
+public fun GeoJsonLineString(
+    coordinates: List<Gmc>,
+    modification: JsonObjectBuilder.() -> Unit = {},
+): GeoJsonLineString = GeoJsonLineString(
+    buildJsonObject {
+        put(GeoJson.TYPE_KEY, "LineString")
+        put(COORDINATES_KEY, coordinates.listToJsonArray())
+        modification()
+    }
+)
+
+@JvmInline
+public value class GeoJsonMultiLineString(override val json: JsonObject) : GeoJsonGeometry {
+    init {
+        require(type == "MultiLineString") { "Not a GeoJson MultiLineString geometry" }
+    }
+
+    public val coordinates: List<List<Gmc>>
+        get() = json[COORDINATES_KEY]?.jsonArray?.map { lineJson ->
+            lineJson.jsonArray.map {
+                it.toGmc()
+            }
+        } ?: error("Coordinates are not provided")
+}
+
+public fun GeoJsonMultiLineString(
+    coordinates: List<List<Gmc>>,
+    modification: JsonObjectBuilder.() -> Unit = {},
+): GeoJsonMultiLineString = GeoJsonMultiLineString(
+    buildJsonObject {
+        put(GeoJson.TYPE_KEY, "MultiLineString")
+        put(COORDINATES_KEY, coordinates.listOfListsToJsonArray())
+        modification()
+    }
+)
+
+@JvmInline
+public value class GeoJsonPolygon(override val json: JsonObject) : GeoJsonGeometry {
+    init {
+        require(type == "Polygon") { "Not a GeoJson Polygon geometry" }
+    }
+
+    public val coordinates: List<List<Gmc>>
+        get() = json[COORDINATES_KEY]?.jsonArray?.map { polygon ->
+            polygon.jsonArray.map { point ->
+                point.toGmc()
+            }
+        } ?: error("Coordinates are not provided")
+}
+
+public fun GeoJsonPolygon(
+    coordinates: List<List<Gmc>>,
+    modification: JsonObjectBuilder.() -> Unit
+): GeoJsonPolygon = GeoJsonPolygon(
+    buildJsonObject {
+        put(GeoJson.TYPE_KEY, "Polygon")
+        put(COORDINATES_KEY, coordinates.listOfListsToJsonArray())
+        modification()
+    }
+)
+
+@JvmInline
+public value class GeoJsonMultiPolygon(override val json: JsonObject) : GeoJsonGeometry {
+    init {
+        require(type == "MultiPolygon") { "Not a GeoJson MultiPolygon geometry" }
+    }
+
+    public val coordinates: List<List<List<Gmc>>>
+        get() = json[COORDINATES_KEY]?.jsonArray?.map { allPolygons ->
+            allPolygons.jsonArray.map { polygon ->
+                polygon.jsonArray.map { point ->
+                    point.toGmc()
+                }
+            }
+        } ?: error("Coordinates are not provided")
+}
+
+public fun GeoJsonMultiPolygon(
+    coordinates: List<List<List<Gmc>>>,
+    modification: JsonObjectBuilder.() -> Unit
+): GeoJsonMultiPolygon = GeoJsonMultiPolygon(
+    buildJsonObject {
+        put(GeoJson.TYPE_KEY, "MultiPolygon")
+        put(COORDINATES_KEY, buildJsonArray { coordinates.forEach { add(it.listOfListsToJsonArray()) } })
+        modification()
+    }
+)
+
+@JvmInline
+public value class GeoJsonGeometryCollection(override val json: JsonObject) : GeoJsonGeometry {
+    init {
+        require(type == "GeometryCollection") { "Not a GeoJson GeometryCollection geometry" }
+    }
+
+    public val geometries: List<GeoJsonGeometry>
+        get() = json["geometries"]?.jsonArray?.map { GeoJsonGeometry(it.jsonObject) } ?: emptyList()
+}
+
+public fun GeoJsonGeometryCollection(
+    geometries: List<GeoJsonGeometry>,
+    modification: JsonObjectBuilder.() -> Unit
+): GeoJsonGeometryCollection =
+    GeoJsonGeometryCollection(
+        buildJsonObject {
+            put(GeoJson.TYPE_KEY, "GeometryCollection")
+            put("geometries", buildJsonArray {
+                geometries.forEach {
+                    add(it.json)
+                }
+            })
+            modification()
+        }
+    )

maps-kt-geojson/src/commonMain/kotlin/center/sciprog/maps/geojson/GeoJsonPropertiesAttribute.kt

@@ -0,0 +1,7 @@
+package center.sciprog.maps.geojson
+
+import center.sciprog.attributes.SerializableAttribute
+import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.serializer
+
+public object GeoJsonPropertiesAttribute : SerializableAttribute<JsonObject>("properties", serializer())

maps-kt-geojson/src/commonMain/kotlin/center/sciprog/maps/geojson/GeoJsonSerializer.kt

@@ -0,0 +1,21 @@
+package center.sciprog.maps.geojson
+
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
+import kotlinx.serialization.json.JsonObject
+
+
+public object GeoJsonSerializer : KSerializer<GeoJson> {
+
+    private val serializer = JsonObject.serializer()
+    override val descriptor: SerialDescriptor
+        get() = serializer.descriptor
+
+    override fun deserialize(decoder: Decoder): GeoJson = GeoJson(serializer.deserialize(decoder))
+
+    override fun serialize(encoder: Encoder, value: GeoJson) {
+        serializer.serialize(encoder, value.json)
+    }
+}

maps-kt-geojson/src/commonMain/kotlin/center/sciprog/maps/geojson/geoJsonToMap.kt

@@ -0,0 +1,87 @@
+package center.sciprog.maps.geojson
+
+import androidx.compose.ui.graphics.Color
+import center.sciprog.attributes.NameAttribute
+import center.sciprog.maps.coordinates.Gmc
+import center.sciprog.maps.features.*
+import kotlinx.serialization.json.contentOrNull
+import kotlinx.serialization.json.intOrNull
+import kotlinx.serialization.json.jsonPrimitive
+
+
+/**
+ * Add a single Json geometry to a feature builder
+ */
+public fun FeatureGroup<Gmc>.geoJsonGeometry(
+    geometry: GeoJsonGeometry,
+    id: String? = null,
+): FeatureRef<Gmc, Feature<Gmc>> = when (geometry) {
+    is GeoJsonLineString -> multiLine(
+        geometry.coordinates,
+    )
+
+    is GeoJsonMultiLineString -> group(id = id) {
+        geometry.coordinates.forEach {
+            multiLine(it)
+        }
+    }
+
+    is GeoJsonMultiPoint -> points(
+        geometry.coordinates,
+    )
+
+    is GeoJsonMultiPolygon -> group(id = id) {
+        geometry.coordinates.forEach {
+            polygon(
+                it.first(),
+            )
+        }
+    }
+
+    is GeoJsonPoint -> circle(geometry.coordinates, id = id)
+    is GeoJsonPolygon -> polygon(
+        geometry.coordinates.first(),
+    )
+
+    is GeoJsonGeometryCollection -> group(id = id) {
+        geometry.geometries.forEach {
+            geoJsonGeometry(it)
+        }
+    }
+}
+
+public fun FeatureGroup<Gmc>.geoJsonFeature(
+    geoJson: GeoJsonFeature,
+    id: String? = null,
+): FeatureRef<Gmc, Feature<Gmc>> {
+    val geometry = geoJson.geometry ?: return group {}
+    val idOverride = id ?: geoJson.getProperty("id")?.jsonPrimitive?.contentOrNull
+
+    return geoJsonGeometry(geometry, idOverride).modifyAttributes {
+        geoJson.properties?.let {
+            GeoJsonPropertiesAttribute(it)
+        }
+
+        geoJson.getProperty("name")?.jsonPrimitive?.contentOrNull?.let {
+            NameAttribute(it)
+        }
+
+        geoJson.getProperty("color")?.jsonPrimitive?.intOrNull?.let {
+            ColorAttribute(Color(it))
+        }
+    }
+}
+
+public fun FeatureGroup<Gmc>.geoJson(
+    geoJson: GeoJson,
+    id: String? = null,
+): FeatureRef<Gmc, Feature<Gmc>> = when (geoJson) {
+    is GeoJsonFeature -> geoJsonFeature(geoJson, id = id)
+    is GeoJsonFeatureCollection -> group(id = id) {
+        geoJson.features.forEach {
+            geoJsonFeature(it)
+        }
+    }
+
+    is GeoJsonGeometry -> geoJsonGeometry(geoJson, id = id)
+}

maps-kt-geojson/src/jvmMain/kotlin/center/sciprog/maps/geojson/geoJsonFeatureJvm.kt

@@ -0,0 +1,23 @@
+package center.sciprog.maps.geojson
+
+import center.sciprog.maps.coordinates.Gmc
+import center.sciprog.maps.features.Feature
+import center.sciprog.maps.features.FeatureGroup
+import center.sciprog.maps.features.FeatureRef
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.jsonObject
+import java.net.URL
+
+/**
+ * Add geojson features from url
+ */
+public fun FeatureGroup<Gmc>.geoJson(
+    geoJsonUrl: URL,
+    id: String? = null,
+): FeatureRef<Gmc, Feature<Gmc>> {
+    val jsonString = geoJsonUrl.readText()
+    val json = Json.parseToJsonElement(jsonString).jsonObject
+    val geoJson = GeoJson(json)
+
+    return geoJson(geoJson, id)
+}

maps-kt-geotiff/build.gradle.kts

@@ -0,0 +1,17 @@
+plugins {
+    id("space.kscience.gradle.jvm")
+    `maven-publish`
+}
+
+repositories {
+    maven("https://repo.osgeo.org/repository/release/")
+}
+
+dependencies {
+    api("org.geotools:gt-geotiff:27.2") {
+        exclude(group = "javax.media", module = "jai_core")
+    }
+
+    api(projects.mapsKtCore)
+    api(projects.mapsKtFeatures)
+}