Add vector rendering

src/jvmMain/kotlin/Main.kt

@@ -1,6 +1,8 @@
 // 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.MaterialTheme
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Home
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.window.Window
 import androidx.compose.ui.window.application
@@ -18,9 +20,11 @@ fun App() {
         val pointOne = 55.568548 to 37.568604
         val pointTwo = 55.929444 to 37.518434
         val features = buildList<MapFeature> {
-            add(MapCircleFeature(pointOne))
+//            add(MapCircleFeature(pointOne))
             add(MapCircleFeature(pointTwo))
             add(MapLineFeature(pointOne, pointTwo))
+            add(MapTextFeature(pointOne.toCoordinates(), "Home"))
+            add(MapVectorImageFeature(pointOne.toCoordinates(), Icons.Filled.Home))
         }
         MapView(viewPoint, features = features, cacheDirectory = Path.of("mapCache"))
     }

src/jvmMain/kotlin/centre/sciprog/maps/compose/MapFeature.kt

@@ -1,14 +1,20 @@
 package centre.sciprog.maps.compose
 
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.geometry.Size
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.ImageBitmap
+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.IntSize
 
 //TODO replace zoom range with zoom-based representation change
 sealed class MapFeature(val zoomRange: ClosedFloatingPointRange<Double>)
 
 private val defaultZoomRange = 1.0..18.0
 
-private fun Pair<Double, Double>.toCoordinates() = GeodeticMapCoordinates.ofDegrees(first, second)
+internal fun Pair<Double, Double>.toCoordinates() = GeodeticMapCoordinates.ofDegrees(first, second)
 
 class MapCircleFeature(
     val center: GeodeticMapCoordinates,
@@ -50,9 +56,28 @@ class MapTextFeature(
     val color: Color = Color.Red,
 ) : MapFeature(zoomRange)
 
-class MapImageFeature(
+class MapBitmapImageFeature(
     val position: GeodeticMapCoordinates,
     val image: ImageBitmap,
+    val size: IntSize = IntSize(15, 15),
     zoomRange: ClosedFloatingPointRange<Double> = defaultZoomRange,
     val color: Color = Color.Red,
 ) : MapFeature(zoomRange)
+
+
+class MapVectorImageFeature internal constructor(
+    val position: GeodeticMapCoordinates,
+    val painter: VectorPainter,
+    val size: Size,
+    zoomRange: ClosedFloatingPointRange<Double> = defaultZoomRange,
+    val color: Color = Color.Red,
+) : MapFeature(zoomRange)
+
+@Composable
+fun MapVectorImageFeature(
+    position: GeodeticMapCoordinates,
+    image: ImageVector,
+    size: Size = Size(20f,20f),
+    zoomRange: ClosedFloatingPointRange<Double> = defaultZoomRange,
+    color: Color = Color.Red,
+): MapVectorImageFeature = MapVectorImageFeature(position, rememberVectorPainter(image), size, zoomRange, color)

src/jvmMain/kotlin/centre/sciprog/maps/compose/MapView.kt

@@ -9,12 +9,10 @@ import androidx.compose.ui.ExperimentalComposeUiApi
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.geometry.Size
-import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.*
-import androidx.compose.ui.graphics.ImageBitmap
 import androidx.compose.ui.graphics.drawscope.clipRect
 import androidx.compose.ui.graphics.drawscope.drawIntoCanvas
-import androidx.compose.ui.graphics.nativeCanvas
+import androidx.compose.ui.graphics.drawscope.translate
-import androidx.compose.ui.graphics.toComposeImageBitmap
 import androidx.compose.ui.input.pointer.PointerEventType
 import androidx.compose.ui.input.pointer.PointerInputChange
 import androidx.compose.ui.input.pointer.onPointerEvent
@@ -28,7 +26,9 @@ import kotlinx.coroutines.Deferred
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.async
 import mu.KotlinLogging
+import org.jetbrains.skia.Font
 import org.jetbrains.skia.Image
+import org.jetbrains.skia.Paint
 import java.net.URL
 import java.nio.file.Path
 import kotlin.io.path.*
@@ -93,13 +93,10 @@ private class OsMapCache(val scope: CoroutineScope, val client: HttpClient, priv
     }
 }
 
-private fun Color.toPaint(): org.jetbrains.skia.Paint = org.jetbrains.skia.Paint().setARGB(
+private fun Color.toPaint(): Paint = Paint().apply {
-    (alpha * 256).toInt(),
+    isAntiAlias = true
-    (red * 256).toInt(),
+    color = toArgb()
-    (green * 256).toInt(),
+}
-    (blue * 256).toInt()
-)
-
 
 private fun Double.toIndex(): Int = floor(this / TILE_SIZE).toInt()
 private fun Int.toCoordinate(): Double = (this * TILE_SIZE).toDouble()
@@ -211,10 +208,24 @@ fun MapView(
                             center = feature.center.toOffset()
                         )
                         is MapLineFeature -> drawLine(feature.color, feature.a.toOffset(), feature.b.toOffset())
-                        is MapImageFeature -> drawImage(feature.image, feature.position.toOffset())
+                        is MapBitmapImageFeature -> drawImage(feature.image, feature.position.toOffset())
-                        is MapTextFeature -> drawIntoCanvas {
+                        is MapVectorImageFeature -> {
                             val offset = feature.position.toOffset()
-                            it.nativeCanvas.drawString(feature.text, offset.x, offset.y, null, feature.color.toPaint())
+                            translate(offset.x - feature.size.width/2, offset.y - feature.size.height/2) {
+                                with(feature.painter) {
+                                    draw(feature.size)
+                                }
+                            }
+                        }
+                        is MapTextFeature -> drawIntoCanvas { canvas ->
+                            val offset = feature.position.toOffset()
+                            canvas.nativeCanvas.drawString(
+                                feature.text,
+                                offset.x + 5,
+                                offset.y - 5,
+                                Font().apply { size = 16f },
+                                feature.color.toPaint()
+                            )
                         }
 
                     }