How to draw and resize polygon using mouse

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Flex

Dear Friends,

In my web application i need to draw shapes in the image using mouse.But i was struck draw and resize polygon..i have dawned polygon..How to resize it?

Please refer the below code.

private function onDrawTriangle():void
                        {
                        var ui:UIComponent = new UIComponent();
                        drawPanel = new Sprite();
                        drawPanel.graphics.clear();
                        drawPanel.graphics.lineStyle(2, 0xFF0000);
                        drawPanel.graphics.beginFill(0xDEFACE);
                        drawPanel.graphics.drawRect(0,0,300,300);
                        drawPanel.graphics.endFill();
                        ui.addChild(drawPanel);
                        addChild(ui);
                        ui.x = 20;
                        ui.y = 20;

                        _lineArr = new Array();
                        line = new Shape();
                        drawPanel.addEventListener(MouseEvent.CLICK,onAddPoint);
                        }

                        private function onAddPoint(evt:MouseEvent):void
                        {
                        if(numSpot <= 10)
                        {
                        var point:Sprite = new Sprite();
                        point.graphics.clear();
                        point.graphics.lineStyle(0,0x0000FF);
                        point.graphics.beginFill(0x0000FF);
                        point.graphics.drawCircle(0,0,5);
                        point.graphics.endFill();

                        point.x = evt.localX;
                        point.y = evt.localY;
                        _lineArr.push({x:point.x,y:point.y});
                        drawPanel.addChild(point);
                        if(numSpot > 0)
                        drawLine();
                        numSpot++;
      }
      }

      private function drawLine():void
      {
      line.graphics.clear();
      line.graphics.lineStyle(2,0x000000);
      if(_lineArr.length > 2)
      line.graphics.beginFill(0xFF0000,0.5);
      line.graphics.moveTo(_lineArr[0].x,_lineArr[0].y);
      for(var i:int=1;i<_lineArr.length;i++)
      {
      line.graphics.lineTo(_lineArr[i].x,_lineArr[i].y);
      }
      line.graphics.lineTo(_lineArr[0].x,_lineArr[0].y);
      if(_lineArr.length > 2)
      line.graphics.endFill();
      drawPanel.addChildAt(line,0);
      }