Add bezier sample

bezier/.gitignore

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+/build

bezier/build.gradle

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+apply plugin: com.soywiz.korge.gradle.KorgeGradlePlugin
+
+korge {
+	id = "com.soywiz.samples.bezier"
+}

bezier/src/commonMain/kotlin/main.kt

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+import com.soywiz.korge.*
+import com.soywiz.korge.input.*
+import com.soywiz.korge.view.*
+import com.soywiz.korim.color.*
+import com.soywiz.korim.paint.*
+import com.soywiz.korim.vector.*
+import com.soywiz.korma.geom.*
+import com.soywiz.korma.geom.bezier.*
+import com.soywiz.korma.geom.vector.*
+
+suspend fun main() = Korge(bgcolor = Colors["#111"], width = 300, height = 300) {
+    val p0 = Point(109, 135)
+    val p1 = Point(25, 190)
+    val p2 = Point(210, 250)
+    val p3 = Point(234, 49)
+
+    val graphics = sgraphics {
+        useNativeRendering = true
+        //useNativeRendering = false
+    }
+
+    fun updateGraphics() {
+        graphics.clear()
+        graphics.stroke(Colors.DIMGREY, info = StrokeInfo(thickness = 1.0)) {
+            moveTo(p0)
+            lineTo(p1)
+            lineTo(p2)
+            lineTo(p3)
+        }
+        graphics.stroke(Colors.WHITE, info = StrokeInfo(thickness = 2.0)) {
+            cubic(p0, p1, p2, p3)
+        }
+        var ratio = 0.3
+        val cubic2 = Bezier.Cubic().setToSplitFirst(Bezier.Cubic(p0, p1, p2, p3), ratio)
+        val cubic3 = Bezier.Cubic().setToSplitSecond(Bezier.Cubic(p0, p1, p2, p3), ratio)
+
+        graphics.stroke(Colors.PURPLE.withAd(0.3), info = StrokeInfo(thickness = 4.0)) {
+            cubic(cubic2)
+        }
+        graphics.stroke(Colors.YELLOW.withAd(0.3), info = StrokeInfo(thickness = 4.0)) {
+            cubic(cubic3)
+        }
+    }
+
+    updateGraphics()
+    createPointController(p0, Colors.RED) { updateGraphics() }
+    createPointController(p1, Colors.GREEN) { updateGraphics() }
+    createPointController(p2, Colors.BLUE) { updateGraphics() }
+    createPointController(p3, Colors.YELLOW) { updateGraphics() }
+}
+
+fun Container.createPointController(point: Point, color: Paint, onMove: () -> Unit) {
+    lateinit var circle: View
+    lateinit var text: Text
+    val anchorView = container {
+        circle = circle(6.0, fill = color, stroke = Colors.DARKGRAY, strokeThickness = 2.0).centered
+        text = text("", 10.0).position(10.0, 6.0)
+    }.position(point)
+
+    fun updateText() {
+        text.text = "(${anchorView.x.toInt()}, ${anchorView.y.toInt()})"
+    }
+    circle.mouse {
+        onOver { circle.colorAdd = ColorAdd(+64, +64, +64, 0) }
+        onOut { circle.colorAdd = ColorAdd(0, 0, 0, 0) }
+    }
+    updateText()
+    anchorView.draggable(circle) {
+        point.x = anchorView.x
+        point.y = anchorView.y
+        updateText()
+        onMove()
+    }
+}