[openrndr-demos] Add DemoContourNearest01

openrndr-demos/src/demo/kotlin/DemoContourNearest01.kt

@@ -0,0 +1,54 @@
+import org.openrndr.application
+import org.openrndr.color.ColorRGBa
+import org.openrndr.extra.noise.simplex
+import org.openrndr.shape.OrientedEllipse
+
+fun main() {
+    application {
+        program {
+            extend {
+                drawer.clear(ColorRGBa.BLACK)
+                drawer.fill = null
+
+                val offset = seconds * 0.1
+                val contours = listOf(
+                        OrientedEllipse(
+                                simplex(320, offset)*width/2.0 + width/2.0,
+                                simplex(3120, offset)*height/2.0 + height/2.0,
+                                simplex(3420, offset)*50.0 + 80.0,
+                                simplex(7521, offset)*50.0+ 80.0,
+                                simplex(3212, offset)*180.0+180.0
+                        ).contour,
+                        OrientedEllipse(
+                                simplex(5320, offset)*width/2.0 + width/2.0,
+                                simplex(73120, offset)*height/2.0 + height/2.0,
+                                simplex(23420, offset)*50.0 + 80.0,
+                                simplex(47521, offset)*50.0+ 80.0,
+                                simplex(33212, offset)*180.0+180.0
+                        ).contour
+                )
+                drawer.fill = null
+                drawer.stroke = ColorRGBa.PINK
+                for (contour in contours) {
+                    drawer.contour(contour)
+                }
+
+                for (j in contours.indices) {
+                    for (i in 0 until j) {
+                        val eqj = contours[j].equidistantPositions(50)
+                        val eqi = contours[i].equidistantPositions(50)
+
+                        for (p in eqj) {
+                            val q = contours[i].nearest(p).position
+                            drawer.lineSegment(p, q)
+                        }
+                        for (p in eqi) {
+                            val q = contours[j].nearest(p).position
+                            drawer.lineSegment(p, q)
+                        }
+                    }
+                }
+            }
+        }
+    }
+}