flex 保存图片到本地

   //保存图片到本地
   private function downloadPicture():void{
    var myData:BitmapData=new BitmapData(this.graphCnvs.width,this.graphCnvs.height);
    myData.draw(this.graphCnvs);
    downloadFile(myData);
   }
   
   public function downloadFile(myData:BitmapData):void{
    
    file=new FileReference();
    file.addEventListener(Event.COMPLETE,downloadComplete);
    file.save(new JPEGEncoder(80).encode(myData),"graph.jpg");
   }
   
   private function downloadComplete(event:Event):void{
    //Alert.show("成功保存图片到本地！","提示");
   }