Add DemoNearestNeighbour01.kt for orx-kdtree

orx-kdtree/README.md

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+# orx-kdtree
+

orx-kdtree/build.gradle

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+sourceSets {
+    demo {
+        java {
+            srcDirs = ["src/demo/kotlin"]
+            compileClasspath += main.getCompileClasspath()
+            runtimeClasspath += main.getRuntimeClasspath()
+        }
+    }
+}
+
+dependencies {
+    demoImplementation("org.openrndr:openrndr-core:$openrndrVersion")
+    demoImplementation("org.openrndr:openrndr-extensions:$openrndrVersion")
+    demoRuntimeOnly("org.openrndr:openrndr-gl3:$openrndrVersion")
+    demoRuntimeOnly("org.openrndr:openrndr-gl3-natives-$openrndrOS:$openrndrVersion")
+    demoImplementation(sourceSets.getByName("main").output)
+}

orx-kdtree/src/demo/kotlin/DemoNearestNeighbour01.kt

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+import org.openrndr.application
+import org.openrndr.extensions.SingleScreenshot
+import org.openrndr.extra.kdtree.buildKDTree
+import org.openrndr.extra.kdtree.findNearest
+import org.openrndr.extra.kdtree.vector2Mapper
+import org.openrndr.math.Vector2
+
+fun main() {
+    application {
+        configure {
+            width = 1280
+            height = 720
+        }
+        program {
+            if (System.getProperty("takeScreenshot") == "true") {
+                extend(SingleScreenshot()) {
+                    this.outputFile = System.getProperty("screenshotPath")
+                }
+            }
+
+            val points = MutableList(1000) {
+                Vector2(Math.random() * width, Math.random() * height)
+            }
+            val tree = buildKDTree(points, 2, ::vector2Mapper)
+            extend {
+                drawer.circles(points, 5.0)
+                val nearest = findNearest(tree, mouse.position, 2, ::vector2Mapper)
+                nearest?.let {
+                    drawer.circle(it.x, it.y, 20.0)
+                }
+            }
+        }
+    }
+}