anchor.diff:     * * isMoveAble: will the sprite move?
      * 
      * */
  -  Sprite(State stateContext, String resourceName, {bool addToStage:
  -      true, bool isMoveAble: true}) : super(
  -      stateContext.game.resourceManager.getBitmapData(resourceName)) {
  +  Sprite(State stateContext, String resourceName, {bool addToStage: true, bool
  +      isMoveAble: true}) : super(stateContext.game.resourceManager.getBitmapData(
  +      resourceName)) {
       this.isMoveAble = isMoveAble;
       _context = stateContext;
       if (addToStage) {
  
positive.code:    * Removes the sprite from the stage and juggler.
     */
    removeFromStage() {
      alive=false;
      _context.game.stage.removeChild(this);
      if (isMoveAble) {
        _context.game.stage.juggler.remove(this);
      }
    }
  
  }
  
negative.code:     pivotX = bitmapData.width / 2;
      pivotY = bitmapData.height / 2;
    }
  
    /**
     * Sprite will be added to the stage and to the juggler if the sprite is moveable.
     */
  