    /**
     * $example: Initialize JOGL and open a window, construct an animator to
     * regularly refresh the screen, and assign GL event listener, mouse
     * listener, and keyboard listener.
     */

    final GLProfile profile = GLProfile.get(GLProfile.GL3);
    final GLCapabilities caps = new GLCapabilities(profile);
    final GLWindow window = GLWindow.create(caps);
    window.setSize(640, 480);
    window.setTitle(ExampleFPSStyleMain.class.getCanonicalName());

    final Animator anim = new Animator();
    anim.add(window);

    window.addGLEventListener(new ExampleFPSStyleGLListener(
      window,
      snap,
      sim,
      mouse_region,
      renderer));

    window.addMouseListener(new ExampleFPSStyleMouseAdapter(
      mouse_region,
      sim,
      rotations));

    window.addKeyListener(new ExampleFPSStyleKeyListener(
      sim,
      background_workers,
      renderer,
      window));

    /**
     * Close the program when the window closes.
     */

    window.addWindowListener(new WindowAdapter() {
      @Override public void windowDestroyed(
        final @Nullable WindowEvent e)
      {
        System.out.println("Stopping animator");
        anim.stop();
        System.out.println("Exiting");
        System.exit(0);
      }
    });

    window.setDefaultCloseOperation(
      WindowClosingProtocol.WindowClosingMode.DISPOSE_ON_CLOSE);
    window.setVisible(true);

    /**
     * Start everything running.
     */

    anim.start();
  }
}
