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;

         }

     }

 }