一个简单的Flex画图

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" borderColor="#FFFFFF" mouseMove="onMouseMove()" mouseUp="onMouseUp()" mouseDown="onMouseDown()">  
    <mx:Script>
        <![CDATA[
            import mx.effects.Move;
            import mx.controls.*;
            import mx.core.*;
            import mx.effects.*;
            public var lines :Sprite =  new Sprite ();
            public var lines1 :flash.display.Sprite =  new Sprite ();
            private var lineX:int;
            private var lineY:int;
   private var bool:Boolean=false;
           
//            public function TestPaint():void
//            {
//                //Alert.show("Hello World!");
//                lines.graphics.lineStyle(2,0x0099ff,1);
//              lines.graphics.moveTo(0,0);
//              lines.graphics.lineTo(50,50);
//                   var comp: UIComponent = new UIComponent();
//                   comp.addChild(lines);
//                   addChild(comp);
//            }
            public function onMouseDown():void
            {
             lineX=this.mouseX;
             lineY=this.mouseY;
              lines.graphics.lineStyle(2,0x0099ff,1);
               lines.graphics.moveTo(lineX,lineY);
               bool=true;
            }
            public function onMouseMove():void
            {
             if(bool)
             {
             lines.graphics.lineTo(this.mouseX,this.mouseY);
             }
            }
            public function onMouseUp():void
            {
              var comp: UIComponent = new UIComponent();
                   comp.addChild(lines);
                   addChild(comp);
                   bool=false;
            }
          
        ]]>
    </mx:Script>
  
</mx:Application>