package {
    import flash.display.*;
    import flash.text.*;
    import flash.events.*;
    import flash.ui.*;
    import flash.utils.*;
    import flash.net.*;
    import flash.geom.*;

    public class Spin extends Sprite {
        [Embed(source = 'b.gif')]
        private var ImageBall:Class;
        [Embed(source = 'shd.gif')]
        private var ImageShadow:Class;

	private var g:JGraphics;
        private var imgBall:Bitmap;
        private var imgShadow:Bitmap;

        private var xp:Number;
        private var yp:Number;
        private var zp:Number;
        private var ap:Number;
        private var rx:Number;
        private var ry:Number;

        public function Spin() {
            var child:Sprite = new Sprite();
            addChild(child);

            g = new JGraphics(600, 600);
            imgBall = new ImageBall();
            imgShadow = new ImageShadow();
            child.addChild(new Bitmap(g.getBitmapData()));

            xp = 0.0; yp = 0.0; zp = 0.0; ap = 0.0;
            rx = 60.0; ry = 100.0;

	    var timer:Timer = new Timer(15, 0);
	    timer.addEventListener(TimerEvent.TIMER, onTick);
	    timer.start();
        }

	private function onTick(ev:TimerEvent):void {
	    g.setColor(JGraphics.WHITE);
	    g.fillRect(0, 0, 600, 600);
	    update();
	}

        private function update():void {
            var i:int;

            ry = Math.sin(ap * 3.14 / 180.0) * 50.0;
            ry += 50.0;
            for (i = 0; i <= 3; i++) {
                var cx:Number = xp + (i * 120.0);
                var cy:Number = yp + (i * 120.0);
                var cz:Number = zp + (i * 120.0);
                var sz:Number = Math.cos(cz * 3.14 / 180.0) * 50.0;
                var sx:Number = Math.sin(cx * 3.14 / 180.0) * sz;
                var sy:Number = Math.cos(cy * 3.14 / 180.0) * sz;
		sx += rx;
                sy += ry;

                var image_size:int = Math.ceil(sz / 20.0 + 15.0);
                if (image_size > 20)
                    image_size = 20;

                g.drawImage(imgBall, sx - (image_size / 2), sy - (image_size / 2));

                sz /= 4.0; sz += 140.0;
                g.drawImage(imgShadow, sx - (image_size / 2), sz - (image_size / 2));
            }

            xp += 1.0;
            yp += 1.5;
            zp += 2;
            ap += 0.2;
        }
    }
}