FX

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import javafx.animation.KeyFrame;
import javafx.animation.Timeline;

import javafx.scene.paint.Color;

import javafx.scene.Scene;
import javafx.stage.Stage;

def rnd = java.util.Random { }
def scene = Scene {
  fill: Color.BLACK
  width:  600
  height: 400
}

Stage {
  title: "Magnetism (JavaFX sample)"
  scene: scene
  override var x on replace old {
    def diff = old - x;
    if (diff != 0)
      for (node in scene.content)
        node.translateX += diff;
  }
  override var y on replace old {
    def diff = old - y;
    if (diff != 0)
      for (node in scene.content)
        node.translateY += diff;
  }
}

// initialize scene after updating its bounds
scene.content = for (i in [1..10]) Ball {
  sign: 0.5 < rnd.nextDouble()
  radius: 10 + 20 * rnd.nextDouble()
  translateX: scene.width  * rnd.nextDouble()
  translateY: scene.height * rnd.nextDouble()
}

// start timeline for 25 frames per second
Timeline {
  repeatCount: Timeline.INDEFINITE
  keyFrames: KeyFrame {
    time: 40ms
    action: function() {
      var n = scene.content.size() - 2;
      for (i in [0..n]) {
        def ball = scene.content[i] as Ball;
        for (j in [i..n]) {
           ball.process(scene.content[j+1] as Ball)
        }
      }
      for (node in scene.content)
        (node as Ball).update()
    }
  }
}.play()