package {
    import flash.display.Sprite;
    import flash.events.Event;
    public class Square3D extends Sprite {
        private var points:Array;
        private var numPoints:uint=4;
        private var fl:Number=250;
        private var vpX:Number=stage.stageWidth/2;
        private var vpY:Number=stage.stageHeight/2;
        public function Square3D() {
            init();
        }
         
        private function init():void {
            points = new Array();
            points[0]=new Point3D(-80,-80,50);
            points[1]=new Point3D(80,-80,50);
            points[2]=new Point3D(80,80,50);
            points[3]=new Point3D(-80,80,50);
             
            //设置每个点的消失点
            for (var i:uint = 0; i < numPoints; i++) {
                points[i].setVanishingPoint(vpX, vpY);
            }
             
            addEventListener(Event.ENTER_FRAME, EnterFrameHandler);
        }
        private function EnterFrameHandler(e:Event):void {
            var dx:Number = mouseX - vpX;
            var dy:Number = mouseY - vpY;
             
            var angleX:Number = dy * 0.001;
            var angleY:Number = dx * 0.001;
            var angleZ:Number = Math.sqrt(dx*dx+dy*dy)*0.0005;
            if (dx>0){angleZ*=-1;}
            for (var i:uint = 0; i < numPoints; i++) {
                var point:Point3D=points[i];
                point.rotateX(angleX);
                point.rotateY(angleY);
                point.rotateZ(angleZ);
            }
            graphics.clear();
            graphics.lineStyle(0);
            graphics.moveTo(points[0].screenX, points[0].screenY);          
            for (i = 1; i < numPoints; i++) {
                graphics.lineTo(points[i].screenX, points[i].screenY);
            }
            graphics.lineTo(points[0].screenX, points[0].screenY);
        }
    }
}