as3 图片旋转与鼠标有关

package 
{
 import flash.display.Bitmap;
 import flash.display.DisplayObject;
 import flash.display.Loader;
 import flash.display.MovieClip;
 import flash.events.Event;
 import flash.events.MouseEvent;
 import flash.events.TimerEvent;
 import flash.geom.Matrix;
 import flash.media.Sound;
 import flash.net.NetStream;
 import flash.net.URLRequest;
 import flash.utils.Timer;

  public class Mainvv extends MovieClip
 {
  private var loader:Loader;
  private var url:String = "1.jpg";
  private var bitmap:Bitmap;
  private var matrix:Matrix;
  private var angle:Number = 0;
  private var speed:Number = .05;

  public function Mainvv()
  {
   if (stage)
   {
    init();
   }
   else
   {
    addEventListener(Event.ADDED_TO_STAGE, init);
   }
  }

  private function init(e:Event = null):void
  {
   loader = new Loader();
   loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onComplete);
   loader.load(new URLRequest(url));

  }

  private function onComplete(e:Event):void
  {
   bitmap = e.target.content as Bitmap;

   bitmap.x = (stage.stageWidth - bitmap.width) / 2;
   bitmap.y = (stage.stageHeight - bitmap.height) / 2;
   addChild(bitmap);

   matrix = bitmap.transform.matrix;

   //将图片旋转30度  
   //rotate(bitmap, 30, bitmap.width / 2, bitmap.height / 2, matrix);  
   stage.addEventListener(MouseEvent.MOUSE_MOVE, running1);

  }

  private function running(e:Event = null):void
  {
   bitmap.x = (stage.stageWidth - bitmap.width) / 2;
   bitmap.y = (stage.stageHeight - bitmap.height) / 2;
   rotate(bitmap, angle, bitmap.width / 2, bitmap.height / 2, matrix);
   angle +=  speed;
   //trace(angle);  
  }

  private function running1(e:MouseEvent):void
  {
   bitmap.x = (stage.stageWidth - bitmap.width) / 2;
   bitmap.y = (stage.stageHeight - bitmap.height) / 2;

   var dy:Number = mouseY - (bitmap.y + bitmap.height / 2);
   var dx:Number = mouseX - (bitmap.x + bitmap.width / 2);
   //bitmap.rotation = Math.atan2(dy, dx) * 180 / Math.PI;  
   rotate(bitmap, Math.atan2(dy, dx), bitmap.width / 2, bitmap.height / 2, matrix);
  }

  private function rotate(dis:DisplayObject,rotation:int,px:int,py:int,srcMatrix:Matrix):void
  {
   var tx:int = dis.x + px;
   var ty:int = dis.y + py;

   var m:Matrix = srcMatrix.clone();
   m.translate(-tx, -ty);
   m.rotate(rotation * 180 / Math.PI);
   m.translate(tx, ty);
   dis.transform.matrix = m;

  }

 }

}