FXSandbox.java

package application;

import java.util.Random;

import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

public class FXSandbox extends Application
{

	private static final int STAR_COUNT = 20000;

	private final Rectangle[] nodes = new Rectangle[STAR_COUNT];
	private final double[] angles = new double[STAR_COUNT];
	private final long[] start = new long[STAR_COUNT];

	private final Random random = new Random();

	@Override
	public void start(final Stage primaryStage)
	{
		for(int i = 0; i < STAR_COUNT; i++)
		{
			nodes[i] = new Rectangle(1, 1, Color.WHITE);
			angles[i] = 2.0 * Math.PI * random.nextDouble();
			start[i] = random.nextInt(2000000000);
		}
		final Scene scene = new Scene(new Group(nodes), 800, 600, Color.BLACK);
		primaryStage.setScene(scene);
		primaryStage.show();

		new AnimationTimer(){
			@Override
			public void handle(long now)
			{
				final double width = 0.5 * primaryStage.getWidth();
				final double height = 0.5 * primaryStage.getHeight();
				final double radius = Math.sqrt(2) * Math.max(width, height);
				for(int i = 0; i < STAR_COUNT; i++)
				{
					final Node node = nodes[i];
					final double angle = angles[i];
					final long t = (now - start[i]) % 2000000000;
					final double d = t * radius / 2000000000.0;
					node.setTranslateX(Math.cos(angle) * d + width);
					node.setTranslateY(Math.sin(angle) * d + height);
				}
			}
		}.start();
	}

	public static void main(String[] args)
	{
		launch(args);
	}

}