Add SVG render for Scheme

build.gradle.kts

@@ -10,7 +10,7 @@ val ktorVersion by extra("2.0.3")
 
 allprojects {
     group = "center.sciprog"
-    version = "0.1.0-dev-10"
+    version = "0.1.0-dev-11"
 }
 
 ksciencePublish{

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

@@ -1,16 +1,22 @@
 // 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.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.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 java.awt.Desktop
+import java.nio.file.Files
 import kotlin.math.PI
 
 @Composable
@@ -19,20 +25,13 @@ fun App() {
     MaterialTheme {
         val scope = rememberCoroutineScope()
 
-
+        val schemeFeaturesState = SchemeFeaturesState.remember {
-        SchemeView(
-            config = SchemeViewConfig(
-                onClick = {
-                    println("${focus.x}, ${focus.y}")
-                }
-            )
-        ) {
             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 = 10f, startAngle = 0f, 2 * PI.toFloat())
+            arc(center = 1132.0881 to 394.99127, radius = 20f, startAngle = 0f, 2 * PI.toFloat())
 
             val hobbitId = circle(410.52737 to 868.7676)
 
@@ -47,13 +46,52 @@ fun App() {
                     if (t >= 1.0) t = 0.0
                 }
             }
-
         }
+
+        val initialViewPoint: SchemeViewPoint = remember {
+            schemeFeaturesState.features().values.computeBoundingBox(1f)?.computeViewPoint()
+                ?: SchemeViewPoint(SchemeCoordinates(0f, 0f))
+        }
+
+        var viewPoint by remember { mutableStateOf<SchemeViewPoint>(initialViewPoint) }
+
+        var snapshot: FeatureStateSnapshot? 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())
+                        }
+                    },
+                )
+            }
+        ) {
+            SchemeView(
+                initialViewPoint = initialViewPoint,
+                featuresState = schemeFeaturesState,
+                config = SchemeViewConfig(
+                    onClick = {
+                        println("${focus.x}, ${focus.y}")
+                    },
+                    onViewChange = { viewPoint = this }
+                ),
+            )
+        }
+
     }
 }
 
 fun main() = application {
-    Window(onCloseRequest = ::exitApplication) {
+    Window(title = "Scheme demo", onCloseRequest = ::exitApplication) {
         App()
     }
 }

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

@@ -9,6 +9,7 @@ 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.geometry.Size
 import androidx.compose.ui.graphics.*
 import androidx.compose.ui.graphics.drawscope.*
 import androidx.compose.ui.input.pointer.*
@@ -255,15 +256,17 @@ public actual fun MapView(
                     val topLeft = feature.oval.topLeft.toOffset()
                     val bottomRight = feature.oval.bottomRight.toOffset()
 
-                    val path = Path().apply {
+                    val size = Size(abs(topLeft.x - bottomRight.x), abs(topLeft.y - bottomRight.y))
-                        addArcRad(
-                            Rect(topLeft, bottomRight),
-                            feature.startAngle.radians.value.toFloat(),
-                            feature.arcLength.radians.value.toFloat()
-                        )
-                    }
 
-                    drawPath(path, color = feature.color, style = Stroke())
+                    drawArc(
+                        color = feature.color,
+                        startAngle = feature.startAngle.degrees.toFloat(),
+                        sweepAngle = feature.arcLength.degrees.toFloat(),
+                        useCenter = false,
+                        topLeft = topLeft,
+                        size = size,
+                        style = Stroke()
+                    )
 
                 }
 

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

@@ -88,4 +88,8 @@ public val Number.degrees: Degrees get() = Degrees(toDouble())
 public fun Angle.normalized(center: Angle = Angle.pi): Angle =
     this - Angle.piTimes2 * floor((radians.value + PI - center.radians.value) / PI/2)
 
-public fun abs(angle: Angle): Angle = if (angle < Angle.zero) -angle else angle
+public fun abs(angle: Angle): Angle = if (angle < Angle.zero) -angle else angle
+
+public fun Radians.toFloat(): Float = value.toFloat()
+
+public fun Degrees.toFloat(): Float = value.toFloat()

maps-kt-scheme/build.gradle.kts

@@ -23,6 +23,7 @@ kotlin {
         }
         val jvmMain by getting {
             dependencies {
+                implementation("org.jfree:org.jfree.svg:5.0.3")
                 api(compose.desktop.currentOs)
             }
         }

maps-kt-scheme/src/jvmMain/kotlin/center/sciprog/maps/scheme/SchemeView.kt

@@ -9,6 +9,7 @@ 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.geometry.Size
 import androidx.compose.ui.graphics.*
 import androidx.compose.ui.graphics.drawscope.*
 import androidx.compose.ui.input.pointer.*
@@ -18,11 +19,13 @@ import androidx.compose.ui.unit.dp
 import mu.KotlinLogging
 import org.jetbrains.skia.Font
 import org.jetbrains.skia.Paint
+import kotlin.math.PI
+import kotlin.math.abs
 import kotlin.math.max
 import kotlin.math.min
 
 
-private fun Color.toPaint(): Paint = Paint().apply {
+internal fun Color.toSkiaPaint(): Paint = Paint().apply {
     isAntiAlias = true
     color = toArgb()
 }
@@ -174,16 +177,17 @@ public fun SchemeView(
                     val topLeft = feature.oval.leftTop.toOffset()
                     val bottomRight = feature.oval.rightBottom.toOffset()
 
-                    val path = Path().apply {
+                    val size = Size(abs(topLeft.x - bottomRight.x), abs(topLeft.y - bottomRight.y))
-                        addArcRad(
-                            Rect(topLeft, bottomRight),
-                            feature.startAngle,
-                            feature.arcLength
-                        )
-                    }
-
-                    drawPath(path, color = feature.color, style = Stroke())
 
+                    drawArc(
+                        color = feature.color,
+                        startAngle = (feature.startAngle * 180 / PI).toFloat(),
+                        sweepAngle = (feature.arcLength * 180 / PI).toFloat(),
+                        useCenter = false,
+                        topLeft = topLeft,
+                        size = size,
+                        style = Stroke()
+                    )
                 }
 
                 is SchemeBitmapFeature -> drawImage(feature.image, feature.position.toOffset())
@@ -204,7 +208,7 @@ public fun SchemeView(
                         offset.x + 5,
                         offset.y - 5,
                         Font().apply { size = 16f },
-                        feature.color.toPaint()
+                        feature.color.toSkiaPaint()
                     )
                 }
 

maps-kt-scheme/src/jvmMain/kotlin/center/sciprog/maps/svg/SvgCanvas.kt

@@ -0,0 +1,292 @@
+package center.sciprog.maps.svg
+
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.geometry.Rect
+import androidx.compose.ui.geometry.Size
+import androidx.compose.ui.geometry.center
+import androidx.compose.ui.graphics.*
+import androidx.compose.ui.graphics.drawscope.DrawContext
+import androidx.compose.ui.graphics.drawscope.DrawTransform
+import androidx.compose.ui.unit.IntOffset
+import androidx.compose.ui.unit.IntSize
+import java.awt.Graphics2D
+
+internal fun Paint.toAwt(): java.awt.Paint {
+    return java.awt.Color(color.toArgb())
+}
+
+
+internal fun DrawContext.asDrawTransform(): DrawTransform = object : DrawTransform {
+    override val size: Size
+        get() = this@asDrawTransform.size
+
+    override val center: Offset
+        get() = size.center
+
+    override fun inset(left: Float, top: Float, right: Float, bottom: Float) {
+        this@asDrawTransform.canvas.let {
+            val updatedSize = Size(size.width - (left + right), size.height - (top + bottom))
+            require(updatedSize.width >= 0 && updatedSize.height >= 0) {
+                "Width and height must be greater than or equal to zero"
+            }
+            this@asDrawTransform.size = updatedSize
+            it.translate(left, top)
+        }
+    }
+
+    override fun clipRect(
+        left: Float,
+        top: Float,
+        right: Float,
+        bottom: Float,
+        clipOp: ClipOp,
+    ) {
+        this@asDrawTransform.canvas.clipRect(left, top, right, bottom, clipOp)
+    }
+
+    override fun clipPath(path: Path, clipOp: ClipOp) {
+        this@asDrawTransform.canvas.clipPath(path, clipOp)
+    }
+
+    override fun translate(left: Float, top: Float) {
+        this@asDrawTransform.canvas.translate(left, top)
+    }
+
+    override fun rotate(degrees: Float, pivot: Offset) {
+        this@asDrawTransform.canvas.apply {
+            translate(pivot.x, pivot.y)
+            rotate(degrees)
+            translate(-pivot.x, -pivot.y)
+        }
+    }
+
+    override fun scale(scaleX: Float, scaleY: Float, pivot: Offset) {
+        this@asDrawTransform.canvas.apply {
+            translate(pivot.x, pivot.y)
+            scale(scaleX, scaleY)
+            translate(-pivot.x, -pivot.y)
+        }
+    }
+
+    override fun transform(matrix: Matrix) {
+        this@asDrawTransform.canvas.concat(matrix)
+    }
+}
+
+internal class SvgCanvas(val graphics: Graphics2D) : Canvas {
+    override fun clipPath(path: Path, clipOp: ClipOp) {
+        TODO("Not yet implemented")
+    }
+
+    override fun clipRect(left: Float, top: Float, right: Float, bottom: Float, clipOp: ClipOp) {
+        if (clipOp == ClipOp.Intersect) {
+            graphics.clipRect(
+                left.toInt(),
+                top.toInt(),
+                (right - left).toInt(),
+                (top - bottom).toInt()
+            )
+        } else {
+            TODO()
+        }
+    }
+
+    override fun concat(matrix: Matrix) {
+        TODO()
+//        matrix.
+//        val affine = AffineTransform()
+//        graphics.transform()
+    }
+
+    override fun disableZ() {
+        //Do nothing
+    }
+
+    override fun drawArc(
+        left: Float,
+        top: Float,
+        right: Float,
+        bottom: Float,
+        startAngle: Float,
+        sweepAngle: Float,
+        useCenter: Boolean,
+        paint: Paint,
+    ) {
+        graphics.paint = paint.toAwt()
+        graphics.drawArc(
+            top.toInt(),
+            left.toInt(),
+            (right - left).toInt(),
+            (top - bottom).toInt(),
+            startAngle.toInt(),
+            sweepAngle.toInt()
+        )
+    }
+
+    override fun drawCircle(center: Offset, radius: Float, paint: Paint) {
+        graphics.paint = paint.toAwt()
+        graphics.drawOval(
+            (center.x - radius).toInt(),
+            (center.y - radius).toInt(),
+            (radius * 2).toInt(),
+            (radius * 2).toInt()
+        )
+    }
+
+    override fun drawImage(image: ImageBitmap, topLeftOffset: Offset, paint: Paint) {
+        graphics.paint = paint.toAwt()
+        graphics.drawImage(image.toAwtImage(), null, topLeftOffset.x.toInt(), topLeftOffset.y.toInt())
+    }
+
+    override fun drawImageRect(
+        image: ImageBitmap,
+        srcOffset: IntOffset,
+        srcSize: IntSize,
+        dstOffset: IntOffset,
+        dstSize: IntSize,
+        paint: Paint,
+    ) {
+        TODO("Not yet implemented")
+    }
+
+    override fun drawLine(p1: Offset, p2: Offset, paint: Paint) {
+        graphics.paint = paint.toAwt()
+        graphics.drawLine(p1.x.toInt(), p1.y.toInt(), p2.x.toInt(), p2.y.toInt())
+    }
+
+    override fun drawOval(left: Float, top: Float, right: Float, bottom: Float, paint: Paint) {
+        graphics.paint = paint.toAwt()
+        graphics.drawOval(
+            left.toInt(),
+            top.toInt(),
+            (right - left).toInt(),
+            (top - bottom).toInt()
+        )
+    }
+
+    override fun drawPath(path: Path, paint: Paint) {
+        val skiaPath = path.asSkiaPath()
+        val points: List<Offset> = skiaPath.points.mapNotNull { it?.let { Offset(it.x, it.y) } }
+        drawPoints(PointMode.Lines, points, paint)
+    }
+
+    override fun drawPoints(pointMode: PointMode, points: List<Offset>, paint: Paint) {
+        graphics.paint = paint.toAwt()
+        val xs = IntArray(points.size) { points[it].x.toInt() }
+        val ys = IntArray(points.size) { points[it].y.toInt() }
+        when (pointMode) {
+            PointMode.Polygon -> {
+                graphics.drawPolygon(xs, ys, points.size)
+            }
+
+            PointMode.Lines -> {
+                graphics.drawPolyline(xs, ys, points.size)
+            }
+
+            PointMode.Points -> {
+                val diameter = paint.strokeWidth
+                if (paint.strokeCap == StrokeCap.Round) {
+                    points.forEach { offset ->
+                        graphics.fillOval(
+                            (offset.x - diameter / 2).toInt(),
+                            (offset.y - diameter / 2).toInt(),
+                            diameter.toInt(),
+                            diameter.toInt()
+                        )
+                    }
+                } else {
+                    points.forEach { offset ->
+                        graphics.fillRect(
+                            (offset.x - diameter / 2).toInt(),
+                            (offset.y - diameter / 2).toInt(),
+                            diameter.toInt(),
+                            diameter.toInt()
+                        )
+                    }
+                }
+            }
+        }
+    }
+
+    override fun drawRawPoints(pointMode: PointMode, points: FloatArray, paint: Paint) {
+        require(points.size % 2 == 0) { "The number of floats must be even" }
+        val offsets = ArrayList<Offset>(points.size / 2)
+        for (i in points.indices step 2) {
+            offsets.add(Offset(points[i], points[i + 1]))
+        }
+        drawPoints(pointMode, offsets, paint)
+    }
+
+    override fun drawRect(left: Float, top: Float, right: Float, bottom: Float, paint: Paint) {
+        graphics.paint = paint.toAwt()
+        graphics.drawRect(
+            left.toInt(),
+            top.toInt(),
+            (right - left).toInt(),
+            (top - bottom).toInt()
+        )
+    }
+
+    override fun drawRoundRect(
+        left: Float,
+        top: Float,
+        right: Float,
+        bottom: Float,
+        radiusX: Float,
+        radiusY: Float,
+        paint: Paint,
+    ) {
+        graphics.paint = paint.toAwt()
+        graphics.drawRoundRect(
+            left.toInt(),
+            top.toInt(),
+            (right - left).toInt(),
+            (top - bottom).toInt(),
+            radiusX.toInt(),
+            radiusY.toInt()
+        )
+    }
+
+    override fun drawVertices(vertices: Vertices, blendMode: BlendMode, paint: Paint) {
+        TODO("Not yet implemented")
+    }
+
+    override fun enableZ() {
+        //do nothing
+    }
+
+    override fun restore() {
+        TODO("Not yet implemented")
+    }
+
+    override fun rotate(degrees: Float) {
+        graphics.rotate(degrees.toDouble())
+    }
+
+    override fun save() {
+        TODO("Not yet implemented")
+    }
+
+    override fun saveLayer(bounds: Rect, paint: Paint) {
+        TODO("Not yet implemented")
+    }
+
+    override fun scale(sx: Float, sy: Float) {
+        graphics.scale(sx.toDouble(), sy.toDouble())
+    }
+
+    override fun skew(sx: Float, sy: Float) {
+        //TODO is this correct?
+        graphics.shear(sx.toDouble(), sy.toDouble())
+    }
+
+    override fun translate(dx: Float, dy: Float) {
+        graphics.translate(dx.toDouble(), dy.toDouble())
+    }
+}
+
+internal class SvgDrawContext(val graphics: Graphics2D, override var size: Size) : DrawContext {
+    override val canvas: Canvas = SvgCanvas(graphics)
+
+    override val transform: DrawTransform = asDrawTransform()
+}

maps-kt-scheme/src/jvmMain/kotlin/center/sciprog/maps/svg/SvgDrawScope.kt

@@ -0,0 +1,464 @@
+package center.sciprog.maps.svg
+
+import androidx.compose.ui.geometry.CornerRadius
+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.unit.IntOffset
+import androidx.compose.ui.unit.IntSize
+import androidx.compose.ui.unit.LayoutDirection
+import java.awt.BasicStroke
+import java.awt.Font
+import java.awt.Graphics2D
+import java.awt.geom.AffineTransform
+import java.awt.image.AffineTransformOp
+import java.awt.Color as AWTColor
+
+private fun Color.toAWT(): java.awt.Color = AWTColor(toArgb())
+private fun Brush.toAWT(): java.awt.Paint = TODO()
+
+public class SvgDrawScope(public val graphics: Graphics2D, size: Size) : DrawScope {
+
+    override val layoutDirection: LayoutDirection
+        get() = LayoutDirection.Ltr
+
+    override val density: Float get() = 1f
+
+    override val fontScale: Float get() = 1f
+
+    override fun drawArc(
+        brush: Brush,
+        startAngle: Float,
+        sweepAngle: Float,
+        useCenter: Boolean,
+        topLeft: Offset,
+        size: Size,
+        alpha: Float,
+        style: DrawStyle,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        graphics.paint = brush.toAWT()
+        when (style) {
+            Fill -> graphics.fillArc(
+                topLeft.x.toInt(),
+                topLeft.y.toInt(),
+                size.width.toInt(),
+                size.height.toInt(),
+                startAngle.toInt(),
+                sweepAngle.toInt()
+            )
+
+            is Stroke -> graphics.drawArc(
+                topLeft.x.toInt(),
+                topLeft.y.toInt(),
+                size.width.toInt(),
+                size.height.toInt(),
+                startAngle.toInt(),
+                sweepAngle.toInt()
+            )
+        }
+    }
+
+    override fun drawArc(
+        color: Color,
+        startAngle: Float,
+        sweepAngle: Float,
+        useCenter: Boolean,
+        topLeft: Offset,
+        size: Size,
+        alpha: Float,
+        style: DrawStyle,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        graphics.paint = color.toAWT()
+        when (style) {
+            Fill -> graphics.fillArc(
+                topLeft.x.toInt(),
+                topLeft.y.toInt(),
+                size.width.toInt(),
+                size.height.toInt(),
+                startAngle.toInt(),
+                sweepAngle.toInt()
+            )
+
+            is Stroke -> graphics.drawArc(
+                topLeft.x.toInt(),
+                topLeft.y.toInt(),
+                size.width.toInt(),
+                size.height.toInt(),
+                startAngle.toInt(),
+                sweepAngle.toInt()
+            )
+        }
+
+    }
+
+    override fun drawCircle(
+        brush: Brush,
+        radius: Float,
+        center: Offset,
+        alpha: Float,
+        style: DrawStyle,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        graphics.paint = brush.toAWT()
+        when (style) {
+            Fill -> graphics.fillOval(
+                (center.x - radius).toInt(),
+                (center.y - radius).toInt(),
+                (radius * 2).toInt(),
+                (radius * 2).toInt()
+            )
+
+            is Stroke -> graphics.drawOval(
+                (center.x - radius).toInt(),
+                (center.y - radius).toInt(),
+                (radius * 2).toInt(),
+                (radius * 2).toInt()
+            )
+        }
+
+    }
+
+    override fun drawCircle(
+        color: Color,
+        radius: Float,
+        center: Offset,
+        alpha: Float,
+        style: DrawStyle,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        graphics.paint = color.toAWT()
+        when (style) {
+            Fill -> graphics.fillOval(
+                (center.x - radius).toInt(),
+                (center.y - radius).toInt(),
+                (radius * 2).toInt(),
+                (radius * 2).toInt()
+            )
+
+            is Stroke -> graphics.drawOval(
+                (center.x - radius).toInt(),
+                (center.y - radius).toInt(),
+                (radius * 2).toInt(),
+                (radius * 2).toInt()
+            )
+        }
+    }
+
+    override fun drawImage(
+        image: ImageBitmap,
+        topLeft: Offset,
+        alpha: Float,
+        style: DrawStyle,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        graphics.drawImage(image.toAwtImage(), null, topLeft.x.toInt(), topLeft.y.toInt())
+    }
+
+    override fun drawImage(
+        image: ImageBitmap,
+        srcOffset: IntOffset,
+        srcSize: IntSize,
+        dstOffset: IntOffset,
+        dstSize: IntSize,
+        alpha: Float,
+        style: DrawStyle,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+        filterQuality: FilterQuality,
+    ) {
+        val scale: AffineTransform = AffineTransform.getScaleInstance(
+            dstSize.width.toDouble() / srcSize.width,
+            dstSize.height.toDouble() / srcSize.height
+        )
+        val awtImage = image.toAwtImage().getSubimage(srcOffset.x, srcOffset.y, srcSize.width, srcSize.height)
+        val op = AffineTransformOp(scale, AffineTransformOp.TYPE_NEAREST_NEIGHBOR)
+        graphics.drawImage(awtImage, op, dstOffset.x, dstOffset.y)
+    }
+
+    override fun drawImage(
+        image: ImageBitmap,
+        srcOffset: IntOffset,
+        srcSize: IntSize,
+        dstOffset: IntOffset,
+        dstSize: IntSize,
+        alpha: Float,
+        style: DrawStyle,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        val scale: AffineTransform = AffineTransform.getScaleInstance(
+            dstSize.width.toDouble() / srcSize.width,
+            dstSize.height.toDouble() / srcSize.height
+        )
+        val awtImage = image.toAwtImage().getSubimage(srcOffset.x, srcOffset.y, srcSize.width, srcSize.height)
+        val op = AffineTransformOp(scale, AffineTransformOp.TYPE_NEAREST_NEIGHBOR)
+        graphics.drawImage(awtImage, op, dstOffset.x, dstOffset.y)
+    }
+
+    override fun drawLine(
+        brush: Brush,
+        start: Offset,
+        end: Offset,
+        strokeWidth: Float,
+        cap: StrokeCap,
+        pathEffect: PathEffect?,
+        alpha: Float,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        graphics.paint = brush.toAWT()
+        graphics.stroke = BasicStroke(strokeWidth)
+        graphics.drawLine(start.x.toInt(), start.y.toInt(), end.x.toInt(), end.y.toInt())
+    }
+
+    override fun drawLine(
+        color: Color,
+        start: Offset,
+        end: Offset,
+        strokeWidth: Float,
+        cap: StrokeCap,
+        pathEffect: PathEffect?,
+        alpha: Float,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        graphics.paint = color.toAWT()
+        graphics.stroke = BasicStroke(strokeWidth)
+        graphics.drawLine(start.x.toInt(), start.y.toInt(), end.x.toInt(), end.y.toInt())
+    }
+
+    override fun drawOval(
+        brush: Brush,
+        topLeft: Offset,
+        size: Size,
+        alpha: Float,
+        style: DrawStyle,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        graphics.paint = brush.toAWT()
+        when (style) {
+            Fill -> graphics.fillOval(topLeft.x.toInt(), topLeft.y.toInt(), size.width.toInt(), size.height.toInt())
+            is Stroke -> graphics.drawOval(
+                topLeft.x.toInt(),
+                topLeft.y.toInt(),
+                size.width.toInt(),
+                size.height.toInt()
+            )
+        }
+    }
+
+    override fun drawOval(
+        color: Color,
+        topLeft: Offset,
+        size: Size,
+        alpha: Float,
+        style: DrawStyle,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        graphics.paint = color.toAWT()
+        when (style) {
+            Fill -> graphics.fillOval(topLeft.x.toInt(), topLeft.y.toInt(), size.width.toInt(), size.height.toInt())
+            is Stroke -> graphics.drawOval(
+                topLeft.x.toInt(),
+                topLeft.y.toInt(),
+                size.width.toInt(),
+                size.height.toInt()
+            )
+        }
+    }
+
+    override fun drawPath(
+        path: Path,
+        brush: Brush,
+        alpha: Float,
+        style: DrawStyle,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        val skiaPath = path.asSkiaPath()
+        val points = skiaPath.points.mapNotNull { it?.let { Offset(it.x, it.y) } }
+        drawPoints(points, PointMode.Lines, brush)
+    }
+
+    override fun drawPath(
+        path: Path,
+        color: Color,
+        alpha: Float,
+        style: DrawStyle,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        val skiaPath = path.asSkiaPath()
+        val points = skiaPath.points.mapNotNull { it?.let { Offset(it.x, it.y) } }
+        drawPoints(points, PointMode.Lines, color)
+    }
+
+    override fun drawPoints(
+        points: List<Offset>,
+        pointMode: PointMode,
+        brush: Brush,
+        strokeWidth: Float,
+        cap: StrokeCap,
+        pathEffect: PathEffect?,
+        alpha: Float,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        graphics.paint = brush.toAWT()
+        graphics.stroke = BasicStroke(strokeWidth)
+        val xs = IntArray(points.size) { points[it].x.toInt() }
+        val ys = IntArray(points.size) { points[it].y.toInt() }
+        graphics.drawPolyline(xs, ys, points.size)
+    }
+
+    override fun drawPoints(
+        points: List<Offset>,
+        pointMode: PointMode,
+        color: Color,
+        strokeWidth: Float,
+        cap: StrokeCap,
+        pathEffect: PathEffect?,
+        alpha: Float,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        graphics.paint = color.toAWT()
+        graphics.stroke = BasicStroke(strokeWidth)
+        val xs = IntArray(points.size) { points[it].x.toInt() }
+        val ys = IntArray(points.size) { points[it].y.toInt() }
+        graphics.drawPolyline(xs, ys, points.size)
+    }
+
+    override fun drawRect(
+        brush: Brush,
+        topLeft: Offset,
+        size: Size,
+        alpha: Float,
+        style: DrawStyle,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        graphics.paint = brush.toAWT()
+        when (style) {
+            Fill -> graphics.fillRect(topLeft.x.toInt(), topLeft.y.toInt(), size.width.toInt(), size.height.toInt())
+            is Stroke -> graphics.drawRect(
+                topLeft.x.toInt(),
+                topLeft.y.toInt(),
+                size.width.toInt(),
+                size.height.toInt()
+            )
+        }
+
+    }
+
+    override fun drawRect(
+        color: Color,
+        topLeft: Offset,
+        size: Size,
+        alpha: Float,
+        style: DrawStyle,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        graphics.paint = color.toAWT()
+        when (style) {
+            Fill -> graphics.fillRect(topLeft.x.toInt(), topLeft.y.toInt(), size.width.toInt(), size.height.toInt())
+            is Stroke -> graphics.drawRect(
+                topLeft.x.toInt(),
+                topLeft.y.toInt(),
+                size.width.toInt(),
+                size.height.toInt()
+            )
+        }
+    }
+
+    override fun drawRoundRect(
+        brush: Brush,
+        topLeft: Offset,
+        size: Size,
+        cornerRadius: CornerRadius,
+        alpha: Float,
+        style: DrawStyle,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        graphics.paint = brush.toAWT()
+        when (style) {
+            Fill -> graphics.fillRoundRect(
+                topLeft.x.toInt(),
+                topLeft.y.toInt(),
+                size.width.toInt(),
+                size.height.toInt(),
+                cornerRadius.x.toInt(),
+                cornerRadius.y.toInt()
+            )
+
+            is Stroke -> graphics.drawRoundRect(
+                topLeft.x.toInt(),
+                topLeft.y.toInt(),
+                size.width.toInt(),
+                size.height.toInt(),
+                cornerRadius.x.toInt(),
+                cornerRadius.y.toInt()
+            )
+        }
+
+    }
+
+    override fun drawRoundRect(
+        color: Color,
+        topLeft: Offset,
+        size: Size,
+        cornerRadius: CornerRadius,
+        style: DrawStyle,
+        alpha: Float,
+        colorFilter: ColorFilter?,
+        blendMode: BlendMode,
+    ) {
+        graphics.paint = color.toAWT()
+        when (style) {
+            Fill -> graphics.fillRoundRect(
+                topLeft.x.toInt(),
+                topLeft.y.toInt(),
+                size.width.toInt(),
+                size.height.toInt(),
+                cornerRadius.x.toInt(),
+                cornerRadius.y.toInt()
+            )
+
+            is Stroke -> graphics.drawRoundRect(
+                topLeft.x.toInt(),
+                topLeft.y.toInt(),
+                size.width.toInt(),
+                size.height.toInt(),
+                cornerRadius.x.toInt(),
+                cornerRadius.y.toInt()
+            )
+        }
+    }
+
+    fun drawText(
+        text: String,
+        x: Float,
+        y: Float,
+        font: Font,
+        color: Color,
+    ) {
+        graphics.paint = color.toAWT()
+        graphics.font = font
+        graphics.drawString(text, x, y)
+    }
+
+    override val drawContext: DrawContext = SvgDrawContext(graphics, size)
+
+}

maps-kt-scheme/src/jvmMain/kotlin/center/sciprog/maps/svg/exportToSvg.kt

@@ -0,0 +1,137 @@
+package center.sciprog.maps.svg
+
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.geometry.Size
+import androidx.compose.ui.graphics.drawscope.Stroke
+import androidx.compose.ui.graphics.drawscope.drawIntoCanvas
+import androidx.compose.ui.graphics.drawscope.translate
+import androidx.compose.ui.graphics.painter.Painter
+import center.sciprog.maps.scheme.*
+import org.jfree.svg.SVGGraphics2D
+import org.jfree.svg.SVGUtils
+import java.awt.Font.PLAIN
+import kotlin.math.PI
+import kotlin.math.abs
+
+
+class FeatureStateSnapshot(
+    val features: Map<FeatureId, SchemeFeature>,
+    val painterCache: Map<PainterFeature, Painter>,
+)
+
+@Composable
+fun SchemeFeaturesState.snapshot(): FeatureStateSnapshot =
+    FeatureStateSnapshot(
+        features(),
+        features().values.filterIsInstance<PainterFeature>().associateWith { it.painter() })
+
+
+fun FeatureStateSnapshot.exportToSvg(
+    viewPoint: SchemeViewPoint,
+    width: Double,
+    height: Double,
+    path: java.nio.file.Path,
+) {
+
+    fun SchemeCoordinates.toOffset(): Offset = Offset(
+        (width / 2 + (x - viewPoint.focus.x) * viewPoint.scale).toFloat(),
+        (height / 2 + (viewPoint.focus.y - y) * viewPoint.scale).toFloat()
+    )
+
+
+    fun SvgDrawScope.drawFeature(scale: Float, feature: SchemeFeature) {
+        when (feature) {
+            is SchemeBackgroundFeature -> {
+                val offset = SchemeCoordinates(feature.rectangle.left, feature.rectangle.top).toOffset()
+                val backgroundSize = Size(
+                    (feature.rectangle.width * scale),
+                    (feature.rectangle.height * scale)
+                )
+
+                translate(offset.x, offset.y) {
+                    with(painterCache[feature]!!) {
+                        draw(backgroundSize)
+                    }
+                }
+            }
+
+            is SchemeFeatureSelector -> drawFeature(scale, feature.selector(scale))
+            is SchemeCircleFeature -> drawCircle(
+                feature.color,
+                feature.size,
+                center = feature.center.toOffset()
+            )
+
+            is SchemeLineFeature -> drawLine(feature.color, feature.a.toOffset(), feature.b.toOffset())
+            is SchemeArcFeature -> {
+                val topLeft = feature.oval.leftTop.toOffset()
+                val bottomRight = feature.oval.rightBottom.toOffset()
+
+                val size = Size(abs(topLeft.x - bottomRight.x), abs(topLeft.y - bottomRight.y))
+
+                drawArc(
+                    color = feature.color,
+                    startAngle = (feature.startAngle * 180 / PI).toFloat(),
+                    sweepAngle = (feature.arcLength * 180 / PI).toFloat(),
+                    useCenter = false,
+                    topLeft = topLeft,
+                    size = size,
+                    style = Stroke()
+                )
+            }
+
+            is SchemeBitmapFeature -> drawImage(feature.image, feature.position.toOffset())
+
+            is SchemeImageFeature -> {
+                val offset = feature.position.toOffset()
+                val imageSize = feature.size.toSize()
+                translate(offset.x - imageSize.width / 2, offset.y - imageSize.height / 2) {
+                    with(painterCache[feature]!!) {
+                        draw(imageSize)
+                    }
+                }
+            }
+
+            is SchemeTextFeature -> drawIntoCanvas { canvas ->
+                val offset = feature.position.toOffset()
+                drawText(
+                    feature.text,
+                    offset.x + 5,
+                    offset.y - 5,
+                    java.awt.Font(null, PLAIN, 16),
+                    feature.color
+                )
+            }
+
+            is SchemeDrawFeature -> {
+                val offset = feature.position.toOffset()
+                translate(offset.x, offset.y) {
+                    feature.drawFeature(this)
+                }
+            }
+
+            is SchemeFeatureGroup -> {
+                feature.children.values.forEach {
+                    drawFeature(scale, it)
+                }
+            }
+        }
+    }
+
+    val svgGraphics2D: SVGGraphics2D = SVGGraphics2D(width, height)
+    val svgScope = SvgDrawScope(svgGraphics2D, Size(width.toFloat(), height.toFloat()))
+
+    svgScope.apply {
+        features.values.filterIsInstance<SchemeBackgroundFeature>().forEach { background ->
+            drawFeature(viewPoint.scale, background)
+        }
+        features.values.filter {
+            it !is SchemeBackgroundFeature && viewPoint.scale in it.scaleRange
+        }.forEach { feature ->
+            drawFeature(viewPoint.scale, feature)
+        }
+    }
+
+    SVGUtils.writeToSVG(path.toFile(), svgGraphics2D.svgElement)
+}