package  {
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.geom.*;
	import flash.display.DisplayObjectContainer;
	[SWF(backgroundColor="0x000000", width="800", height="600", frameRate="30")]	
	public class FishesSwim extends Sprite {

		public var fishes:Vector.<FishSwim> = new Vector.<FishSwim>();
		public function FishesSwim() {
			init();
		}
		private function init():void {
			for(var i:int = 0; i < 50; i++){
				var fish:FishSwim = new FishSwim(Math.random()*0xFFFFFF,
					new Vector3D(Math.random()*2-1,Math.random()*2-1,Math.random()*2-1) /*velocity*/);
				fish.x= Math.random()*stage.stageWidth;
				fish.y= Math.random()*stage.stageHeight;
				fish.z= Math.random()*50;
			    addChild(fish);
				fishes.push(fish);
			}
			addEventListener(Event.ENTER_FRAME, onEnterFrame);
		}
		private function onEnterFrame(event:Event):void {
			(root as Sprite).graphics.clear();
			zSort(fishes);
			fishes.forEach(function(fish:FishSwim,i:int,a:Vector.<FishSwim>):void {
					//move
					fish.x += fish.velocity.x;
					fish.y += fish.velocity.y;
					fish.z += fish.velocity.z;
					fish.render();
				});
		}

		private function zSort(sprites:Vector.<FishSwim>):void {
			sprites = sprites.sort(function(a:FishSwim, b:FishSwim):Number { return b.z-a.z; });
		}
	}
}
// Copyright (c) 2008 David Wilhelm
// MIT license: http://www.opensource.org/licenses/mit-license.php