用Actionscript3.0编写的伪3D文字旋转

程序代码如下（文档类）

package  {
    
    import flash.display.MovieClip;
    import flash.display.Sprite;
    import flash.text.TextField;
    import flash.events.Event;
    
    
    public class sanDwenzixuanzhuan extends Sprite {
        
        private var dushu:Number=0;
        private var rx:Number=150;//半径
        private var ry:Number=50;//半径
        private var zs:Number=3;//转速
        public function sanDwenzixuanzhuan() {
            // constructor code
            init();
        }
        private function movexz(la:String,jiao:Number=0):Sprite
        {
            var sp:Sprite=new Sprite();
            var lab:TextField=new TextField();
            lab.text=la;
            //白色字体
            lab.textColor=0xffffff;
            lab.width=20;
            sp.addChild(lab);
            addEventListener(Event.ENTER_FRAME,movetext);
            function movetext(ee:Event):void
            {
                //文字的位置
                sp.x=250+rx*Math.cos(jiao*Math.PI/180);
                sp.y=200+ry*Math.sin(jiao*Math.PI/180);
                //使字体的透明度在正前方可见，
                sp.alpha=Math.cos(jiao*Math.PI/180-Math.PI/3);
                jiao-=zs;
            }
            return sp;
        }
        public function init():void
        {
            var _arr:Array=new Array("好","好","学","习","天","天","向","上","!");
            for (var i:int=0;i<_arr.length;i++)
            {
                var s:Sprite=movexz(_arr[i],i*360/_arr.length);
                s.x=0;
                addChild(s);
            }
        }
    }
    
}