图片绕中心旋转

    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; 
         
        /**
         * ...
         * @author hacker47
         */ 
        public class Main 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 Main()  
            { 
                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; 
                 
            } 
             
        } 
     
    }