Give an image a new X and Y postion every 1 second

Question

I am trying change the image LayoutX and LayoutY positions ever 1 second. But I cant find any (timer) method suitable for this. I am looking for something similar to the JavaScript "setInterval" that simply lets me create a "timer cycle" using Java or JavaFX.

Any advice are widely appriciated!

Answer 1

With java.util.Timer you can schedule such a task.

The method timer.schedule() executes a task only ones. To repeat your task use the method timer.scheduleAtFixedRate() .

 Timer timer = new Timer();
 timer.scheduleAtFixedRate(new TimerTask() {

   @Override
   public void run() {
        System.out.println("hello");
   }
 }, 1000, 1000);

The second parameter of scheduleAtFixedRate() is the delay before the first execution in milliseconds and the last parameter is the interval between the tasks being executed in milliseconds.

Answer 2

You can use a Timeline with INDEFINITE cycle count for this purpose.

Example:

Timeline tl = new Timeline(new KeyFrame(Duration.seconds(1), evt -> {
    // toggle image postion
    imageView.setLayoutX(200 - imageView.getLayoutX());
    imageView.setLayoutY(200 - imageView.getLayoutY());
}));
tl.setCycleCount(Animation.INDEFINITE);
tl.play();

This guaranties the event handler runs on the JavaFX application thread.