forked from: LineWheel

/**
 * Copyright hacker_cif_rxsb ( http://wonderfl.net/user/hacker_cif_rxsb )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/cBas
 */

// forked from bkzen's LineWheel
package
{
	import flash.display.Bitmap;
	import flash.display.BitmapData;
	import flash.display.Graphics;
	import flash.display.Shape;
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.events.TimerEvent;
	import flash.geom.ColorTransform;
	import flash.geom.Rectangle;
	import flash.utils.Timer;
	
	/**
	 * Click でなんかなる、E	 * @author jc at bk-zen.com
	 */
	[SWF(width="465", height="465", backgroundColor="0x0", frameRate="30")]
	public class Test9 extends Sprite
	{
		private const W: int = 465;
		private const H: int = 465;
		private const W2: int = 232;
		private const H2: int = 232;
		private var TEAM: int = (Math.random() > 0.5 ? 18 : 32);
		private const TEAM_NUM: int = 30;
		private var particles: Array = [];
		private var particleV: Array = [];
		private var bmpData:BitmapData;
		private var view: Bitmap;
		private var line: Graphics;
		private var sh: Shape;
		private var cnt: int;
		private var rect:Rectangle;
		private var colorTf:ColorTransform;
		private var timer:Timer;
		
		public function Test9()
		{
			if (stage) init();
			else addEventListener(Event.ADDED_TO_STAGE, init);
		}
		
		private function init(e: Event = null): void 
		{
			removeEventListener(Event.ADDED_TO_STAGE, init);
			//
			bmpData = new BitmapData(W, H, false, 0x0);
			view = new Bitmap(bmpData);
			var i: int, j: int, p: Particle, arr: Array, t: Number;
			while (++i <= TEAM)
			{
				j = 0;
				arr = [];
				while (++ j <= TEAM_NUM)
				{
					p = new Particle();
					p.x = W2;
					p.y = H2;
					t = i * 2 * Math.PI / TEAM + (0.128 * j * ((i % 6) * 0.2 + 0.25));
					p.vx = Math.cos(t) * (0.5 + (TEAM_NUM - j) / TEAM_NUM * 0.5);
					p.vy = Math.sin(t) * (0.5 + (TEAM_NUM - j) / TEAM_NUM * 0.5);
					arr.push(p);
				}
				particles.push(arr);
			}
			sh = new Shape();
			line = sh.graphics;
			addChild(view);
			rect = bmpData.rect;
			colorTf = new ColorTransform(1, 1, 1, 1, -32, -64, -64);
			addEventListener(Event.ENTER_FRAME, onEnter);
			stage.addEventListener(MouseEvent.CLICK, onClick);
			timer = new Timer(8000);
			timer.addEventListener(TimerEvent.TIMER, onTimer);
			timer.start();
		}
		
		private function onTimer(e:TimerEvent):void 
		{
			reset();
			timer.delay = Math.random() * 3000 + 5000;
		}
		
		private function onClick(e:MouseEvent):void 
		{
			reset();
		}
		
		private function reset():void
		{
			if (cnt > 0) return;
			cnt = TEAM_NUM;
		}
		
		private function onEnter(e: Event): void 
		{
			bmpData.lock();
			bmpData.colorTransform(rect, colorTf);
			var i: int, j: int, p: Particle, arr: Array, vx: Number, vy: Number;
			line.clear();
			line.lineStyle(1, 0xFFFFFF);
			while (i < TEAM)
			{
				arr = particles[i];
				j = 0;
				p = Particle(arr[j]);
				p.x += p.vx;
				p.y += p.vy;
				line.moveTo(p.x, p.y);
				while (++j < TEAM_NUM)
				{
					p = Particle(arr[j]);
					p.x += p.vx;
					p.y += p.vy;
					line.lineTo(p.x, p.y);
				}
				if (cnt > 0) 
				{
					p = arr.shift();
					p.x = W2;
					p.y = H2;
					p.vx *= -1;
					p.vy *= -1;
					arr.push(p);
				}
				i++;
			}
			if (cnt > 0) cnt--;
			bmpData.draw(sh);
			bmpData.unlock();
		}
	}
}

class Particle
{
	public var x: Number = 0;
	public var y: Number = 0;
	public var vx: Number = 0;
	public var vy: Number = 0;
}