anchor.diff:  }
   
   startArrow(int startx, int starty) {
  - // create body
    Arrow arrow = new Arrow();
     arrow.addTo(stage);
   
  
positive.code:     Arrow arrow = new Arrow();
      arrow.addTo(stage);
      arrow.pointTo(0, i*3 , 860 , i*3);
     }
    });
    document.querySelector('#pen').onClick.listen((e) {
  
negative.code:   
    void endDraw(){
     
     print('${lineVector.width} , ${lineVector.height}');
     BitmapData bitmapData = new BitmapData(800,500, true, 0);
     bitmapData.draw(lineVector);
     Bitmap body = new Bitmap(bitmapData);
  //   body ..x = startpoint.x ..y = startpoint.y;
     addChild(body);
     lineVector.graphics.clear();
     removeChild(lineVector);
     
    }
  