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    private function init():void
    {
     stage.addEventListener(MouseEvent.MOUSE_MOVE, onMouseMove);
    }
  

    private function onMouseMove(event:MouseEvent):void
    {
     x1 = mouseX;
     y1 = mouseY;
     graphics.clear();
     graphics.lineStyle(1);
     graphics.moveTo(x0, y0);
     graphics.curveTo(x1, y1, x2, y2);
    }
   }
  }