flex图片上画图

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<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"><mx:Style>Application {fontSize: 12pt;}</mx:Style><mx:Script><![CDATA[import mx.core.UIComponent;var template:UIComponent;var template2:UIComponent;protected function btn1_clickHandler(event:MouseEvent):void{template = new UIComponent();template.graphics.clear();template.graphics.lineStyle( 1, 0x0000FF );template.graphics.beginFill( 0xFFFFFF, 0.2 );template.graphics.drawRoundRect( 0, 0, 50, 50, 20, 20 );image.addChild(template);template2 = new UIComponent();template2.graphics.clear();template2.graphics.lineStyle( 1, 0x0000FF );template2.graphics.beginFill( 0xFFFFFF, 0.2 );template2.graphics.drawRoundRect(80, 80, 50, 50, 20, 20 );image.addChild(template2);//source="@Embed('img/0.jpg')"}protected function btn2_clickHandler(event:MouseEvent):void{image.removeChildAt(1);}]]></mx:Script><mx:Image  id="image" source="@Embed('img/0.jpg')"  width="200" height="200"></mx:Image><mx:Button id="btn1" click="btn1_clickHandler(event)" label="画图"/><mx:Button id="btn2" click="btn2_clickHandler(event)" label="撤销"/></mx:Application>