anchor.diff:  main() {
     var game = new GameLoop('#gamebox', width: 800, height: 400);
     game.debug = new DebugDrawer('debuger');
  -//  game.timeScale = 0.1;
  +  game.timeScale = 1.0;
  +
     var loader = new AssetLoader();
     loader.add('paddle', new ImageAsset('paddle.png'));
     loader.add('ball', new ImageAsset('ball.png'));
  
positive.code:     body2.syncFromNode();
  
      var ballbody = new ArcadeBody()
        ..position = new Vector2(400.0, 300.0)
        ..speed = new Vector2(-100.0, 200.0)
        ..restitution = new Vector2(1.0, 1.0)
        ..addTo(world);
  
  
negative.code:     wallsCollision.collider1 = ballbody.collider;
      wallsCollision.collider2 = world.collider;
      wallsCollision.onCollision.listen(bounce);
      wallsCollision.onCollision.listen((event) {
        if (event.delta.x != 0.0) {
          ballbody.position.setValues(400.0, 200.0);
          ballbody.speed.setValues(0.0, 0.0);
        }
      });
      world.collisions.add(wallsCollision);
  
      body1.collider = new AABB2Collider();
  