anchor.diff:      visible = interactive = true;
       _localTransform = new Matrix3.identity();
       _worldTransform = new Matrix3.identity();
  +    _bounds = new Rectangle.zero();
     }
     
     removeFromParent() {
  
positive.code:   double _x, _y, _width, _height, _pivotX, _pivotY, _skewX, _skewY, _scaleX, _scaleY, _rotation, _alpha;
    bool _dirty, visible, interactive;
    Matrix3 _localTransform, _worldTransform;
    
    DisplayObject() {
      x = y = width = height = rotation = pivotX = pivotY = 0.0;
  
negative.code:     
    }
    
    hitTest(Point point) => bounds.containsPoint(point);
  
    dispose() {
      // TODO implement this method
    }
    
    get bounds {
      if(_dirty) {
        final transform = worldTransform;    
        final wx = transform[2];
        final wy = transform[5];
        _bounds.setTo(wx, wy, _width, _height);
      }
      return _bounds;
    }
    
    get worldTransform {
  