[ActionScript 3.0] AS3 3D双圆环贴图

package
{
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.MovieClip;
    import flash.display.Sprite;
    import flash.display.TriangleCulling;
    import flash.events.Event;
    import flash.geom.ColorTransform;
    import flash.geom.Vector3D;
    
    /**
     * @author Frost.Yen
     * @E-mail 871979853@qq.com
     * @create 2015-9-11 下午2:59:18
     *
     */
    [SWF(width="1024",height="768")]
    public class RingTexture extends Sprite
    {
        [Embed(source="test.jpg")]
        private var _img:Class;
        private var _bmpd:BitmapData;
        private var _pointContainer:Sprite;
        private var _graphicContainer:Sprite;
        private var _ringContainer:Sprite;
        private var _pointArr:Array = [];//放所有点,用于计算每个点的2D投影坐标
        private var _arr1:Array = [];//_arr1(二维数数)放所有点,用于设置点的绘制顺序
        private var _arr2:Array = [];//_arr2存每个方块,含它们的V,I,U,Z
        private var _circle:int=40;//环上的圆圈个数
        private var _num:int = 10;
        private var _ang:Number = 360/_circle;
        private var _focus:Number = 500;
        private var _h:int;
        private var _w:int; 
        public function RingTexture()
        {
            initViews();
            initEventListeners();
        }
        private function initViews():void
        {
            _pointContainer = new Sprite();
            _graphicContainer = new Sprite();
            _ringContainer = new Sprite();
            _ringContainer.x = _graphicContainer.x = this.stage.stageWidth*0.5;
            _ringContainer.y = _graphicContainer.y = this.stage.stageHeight*0.5;    
            _ringContainer.z = 0;//必须写，不要认为0是它的默认值
            _bmpd = (new _img() as Bitmap).bitmapData;
            _graphicContainer.transform.colorTransform=new ColorTransform(1,1,1,1,50,50,50);//提高一点填充的亮度,图是画在_graphicContainer中的
            this.addChild(_ringContainer);
            this.addChild(_graphicContainer);
            createRing();
        }
        private function initEventListeners():void
        {
            this.addEventListener(Event.ENTER_FRAME,onEnterFrame);
        }
        private function onEnterFrame(e:Event):void{
            _graphicContainer.graphics.clear();
            _arr2 = [];
            //总容器绕自身Y,X轴随鼠标动
            _ringContainer.transform.matrix3D.prependRotation((_graphicContainer.x-mouseX)/50,Vector3D.Y_AXIS);
            _ringContainer.transform.matrix3D.prependRotation((mouseY-_graphicContainer.y)/50,Vector3D.X_AXIS);
            for(var i:int = 0;i<_pointArr.length;i++){
                _pointArr[i].Z=(_pointArr[i] as MovieClip).transform.getRelativeMatrix3D(_graphicContainer).position.z;
                _pointArr[i].X=(_pointArr[i] as MovieClip).transform.getRelativeMatrix3D(_graphicContainer).position.x*(_focus/(_focus+_pointArr[i].Z));
                _pointArr[i].Y=(_pointArr[i] as MovieClip).transform.getRelativeMatrix3D(_graphicContainer).position.y*(_focus/(_focus+_pointArr[i].Z));//加入了焦距控制,符合透视原理,求出3D点的2D投影坐标
            }
            for(i=0;i<_h;i++){
                for(var k:int = 0;k<_w;k++){
                    var vertices:Vector.<Number>=Vector.<Number>([_arr1[i][k].X,_arr1[i][k].Y,_arr1[i+1][k].X,_arr1[i+1][k].Y,_arr1[i+1][k+1].X,_arr1[i+1][k+1].Y,_arr1[i][k+1].X,_arr1[i][k+1].Y]);//坐标
                    var indices:Vector.<int>=Vector.<int>([0,1,3,1,2,3]);//画三角形的顶点顺序
                    var uvtData:Vector.<Number>=Vector.<Number>([i/_h*2,k/_w*2,(i+1)/_h*2,k/_w*2,(i+1)/_h*2,(k+1)/_w*2,i/_h*2,(k+1)/_w*2]);//分割位图的比例
                    i!=40?_arr2.push({V:vertices,I:indices,U:uvtData,Z:_arr1[i][k].Z+_arr1[i+1][k].Z+_arr1[i+1][k+1].Z+_arr1[i][k+1].Z}):0;//当h==40时,如果也压入UVTZ,会把两个环的绘制起点首尾相连,,,Z是四个点z坐标总和,用于后面的排序
                    
                }
            }
            _arr2.sortOn("Z",18);
            for(i = 0;i<_arr2.length;i++){
                //_graphicContainer.graphics.lineStyle(1,0xff0000);
                _graphicContainer.graphics.beginBitmapFill(_bmpd);
                _graphicContainer.graphics.drawTriangles(_arr2[i].V,_arr2[i].I,_arr2[i].U,TriangleCulling.NONE);//画三角形,背面不剔除
                _graphicContainer.graphics.endFill();
            }
        }
        private function createRing():void
        {
            for(var m:int = 0;m<2;m++){
                var sp:Sprite = new Sprite();//环容器，用于存放mc点
                _ringContainer.addChild(sp);
                sp.z = m*160-80;
                for(var i:int=0;i<=_circle;i++){
                    _arr1[i+m*41] = [];//两个环共82个小圈(0-40,41-81),每个小圈中有11份,这个二维数组共存902个点
                    for(var j:int = 0;j<=_num;j++){
                        var mc:MovieClip = new MovieClip();
                        sp.addChild(mc);
                        mc.x=(m==0)?90+15*Math.cos(j*2*Math.PI/_num):15*Math.cos(j*2*Math.PI/_num);//90改为50,变成连体，现在是嵌套
                        mc.y=(m==0)?15*Math.sin(j*2*Math.PI/_num):100+15*Math.sin(j*2*Math.PI/_num);
                        mc.z = 0;//当m为0时,圆平放,为1时竖放
                        if(m==0){
                            //让坐标点在大圆周上分布
                            mc.transform.matrix3D.appendRotation(i*_ang,Vector3D.Y_AXIS);
                        }else{
                            mc.transform.matrix3D.appendRotation(i*_ang,Vector3D.X_AXIS)
                        }
                        //放所有点,用于获取每个3d点的二维投影坐标,存入动态属性X,Y
                        _pointArr.push(mc);
                        //放所有点于二维数组中,用于设置drawTriangles的三角形顶点
                        _arr1[i+m*41].push(mc);
                    }
                }
                
            }
            _h = _arr1.length-1;
            _w = _arr1[0].length - 1;//_h纬线数最大索引81,_w经线数最大索引10
        }
    }
}