[ActionScript 3.0] AS3实现3D旋转

 package
 {
     import flash.display.Bitmap;
     import flash.display.BitmapData;
     import flash.display.DisplayObject;
     import flash.display.Sprite;
     import flash.events.MouseEvent;
     import flash.events.TimerEvent;
     import flash.geom.PerspectiveProjection;
     import flash.geom.Point;
     import flash.geom.Vector3D;
     import flash.utils.Timer;
     import flash.utils.getDefinitionByName;     /**
      * @author Frost.Yen
      * @E-mail 871979853@qq.com
      * @create 2015-8-13 下午4:03:27
      *
      */
     [SWF(width="1024",height="768")]
     public class RotateMain extends Sprite
     {
         [Embed(source="assets/001.png")]
         private var _img0:Class;
         [Embed(source="assets/002.png")]
         private var _img1:Class;
         [Embed(source="assets/003.png")]
         private var _img2:Class;
         [Embed(source="assets/004.png")]
         private var _img3:Class;
         [Embed(source="assets/005.png")]
         private var _img4:Class;
         [Embed(source="assets/006.png")]
         private var _img5:Class;
         [Embed(source="assets/007.png")]
         private var _img6:Class;
         [Embed(source="assets/007.png")]
         private var _img7:Class;         private var _num:int = 7;
         private var _radius:Number = 300;
         private var _itemArr:Array = [];
         private var _speed:Number = 1;
         private var _ratio:Number = 0.25;//系数
         private var _downX:Number;
         private var _container:Sprite;
         private var _timer:Timer = new Timer(20);
         public function RotateMain()
         {
             this.graphics.beginFill(0,1);
             this.graphics.drawRect(0,0,1024,768);
             this.graphics.endFill();
             initViews();
             initEventListeners();
         }
         private function initViews():void
         {
             _container = new Sprite();
             _container.x = 1024*0.5;
             _container.y = 768*0.5-200;
             _container.z = 0;
             this.addChild(_container);
             for(var i:int = 0;i<_num;i++){
                 var angle:Number = Math.PI * 2/_num*i;
                 var sp:Sprite = new Sprite();
                 //var img:Class = getDefinitionByName("RotateMain__img"+i) as Class;
                 var bmp:Bitmap = new this["_img"+i]();                 sp.x = Math.cos(angle)*_radius;
                 sp.z = Math.sin(angle)*_radius;
                 sp.addChild(bmp);
                 _container.addChild(sp);
                 _itemArr.push(sp);
             }
             swapItems();
             _timer.addEventListener(TimerEvent.TIMER,onTimer);
             _timer.start();         }
         private function initEventListeners():void
         {
             stage.addEventListener(MouseEvent.MOUSE_DOWN,onDown);
         }
         private function onDown(e:MouseEvent):void
         {
             stage.addEventListener(MouseEvent.MOUSE_MOVE,onMove);
             stage.addEventListener(MouseEvent.MOUSE_UP,onUp);
             _timer.stop();
             _downX = mouseX;
         }
         private function onMove(e:MouseEvent):void
         {
             _speed = (_downX-mouseX)*0.01;
             _container.rotationY += _ratio * _speed;
             var p:PerspectiveProjection = new PerspectiveProjection();
             p.fieldOfView = 55;
             p.projectionCenter = new Point(512,-100);
             _container.transform.perspectiveProjection = p;
             swapItems();         }
         private function onUp(e:MouseEvent):void
         {
             stage.removeEventListener(MouseEvent.MOUSE_MOVE,onMove);
             stage.removeEventListener(MouseEvent.MOUSE_UP,onUp);
             _timer.start();
         }
         private function onTimer(e:TimerEvent):void
         {
             if(_speed < -1){
                 _speed+=0.02;
                 if(_speed >=-1){
                     _speed = -1;
                 }
             }else if(_speed >1){
                 _speed-=0.02;
                 if(_speed <=1){
                     _speed = 1;
                 }
             }else if(_speed>-1&&_speed<0){
                 _speed-=0.02;
             }else if(_speed<1&&_speed>0){
                 _speed+=0.02;
             }
             _container.rotationY += _ratio *_speed ;//trace(_ratio,_speed);
             var p:PerspectiveProjection = new PerspectiveProjection();
             p.fieldOfView = 55;
             p.projectionCenter = new Point(512,-100) ; //视点
             _container.transform.perspectiveProjection = p;
             swapItems();
         }
         private function swapItems():void
         {
             _itemArr.sort(swapDepth);
             for(var i:int = 0; i < _itemArr.length; i++ )
             {
                 _container.addChildAt(_itemArr[i] as Sprite,i);
                 (_itemArr[i] as Sprite).rotationY -= _ratio *_speed;
             }
         }
         private function swapDepth(objA:DisplayObject,objB:DisplayObject):int
         {
             var posA:Vector3D = objA.transform.matrix3D.position ;
             posA = _container.transform.matrix3D.deltaTransformVector(posA);
             var posB:Vector3D = objB.transform.matrix3D.position;
             posB = _container.transform.matrix3D.deltaTransformVector(posB);
             return posB.z - posA.z;
         }
     }
 }