Chaos game: Difference between revisions

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 	}
 	return err
+}</lang>
+=={{header|Groovy}}==
+{{libheader|JavaFX}}
+<lang Groovy>import javafx.animation.AnimationTimer
+import javafx.application.Application
+import javafx.scene.Scene
+import javafx.scene.layout.Pane
+import javafx.scene.paint.Color
+import javafx.scene.shape.Circle
+import javafx.stage.Stage
+class ChaosGame extends Application {
+    final randomNumberGenerator = new Random()
+    @Override
+    void start(Stage primaryStage) {
+        primaryStage.title = 'Chaos Game'
+        primaryStage.scene = getScene()
+        primaryStage.show()
+    }
+    def getScene() {
+        def colors = [Color.RED, Color.GREEN, Color.BLUE]
+        final width = 640, height = 640, margin = 60
+        final size = width - 2 * margin
+        def points = [
+                new Circle(width / 2, margin, 1, colors[0]),
+                new Circle(margin, size, 1, colors[1]),
+                new Circle(margin + size, size, 1, colors[2])
+        ]
+        def pane = new Pane()
+        pane.style = '-fx-background-color: black;'
+        points.each {
+            pane.children.add it
+        }
+        def currentPoint = new Circle().with {
+            centerX = randomNumberGenerator.nextInt(size - margin) + margin
+            centerY =  randomNumberGenerator.nextInt(size - margin) + margin
+            it
+        }
+        ({
+            def newPoint = generatePoint(currentPoint, points, colors)
+            pane.children.add newPoint
+            currentPoint = newPoint
+        } as AnimationTimer).start()
+        new Scene(pane, width, height)
+    }
+    def generatePoint(currentPoint, points, colors) {
+        def selection = randomNumberGenerator.nextInt 3
+        new Circle().with {
+            centerX = (currentPoint.centerX + points[selection].centerX) / 2
+            centerY = (currentPoint.centerY + points[selection].centerY) / 2
+            radius = 1
+            fill = colors[selection]
+            it
+        }
+    }
+    static main(args) {
+        launch(ChaosGame)
+    }
 }</lang>