// forked from yamatk's forked from: HANABI
// forked from yanbaka's HANABI
// 色々参考にさせて頂いてます
package
{
	import flash.display.Bitmap;
	import flash.display.BitmapData;
	import flash.display.BlendMode;
	import flash.display.PixelSnapping;
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.TimerEvent;
	import flash.filters.BlurFilter;
	import flash.geom.ColorTransform;
	import flash.geom.Matrix;
	import flash.geom.Point;
	import flash.geom.Rectangle;
	import flash.utils.Timer;
	[SWF(width = "465", height = "465", backgroundColor = "0x000000", frameRate = "30")]
	
	public class Hanabi extends Sprite
	{
		private const WIDTH:Number = 465;
		private const HEIGH:Number = 465;
		
		private var _particles:Array;
		private var _canvas:BitmapData;
		private var _glow:BitmapData;
		private var _rect:Rectangle;
		private var cTra:ColorTransform;
		private var timer:Timer;
		
		private var sx:Number;
		private var sy:Number;
		
                private var t0:int =0;
                private var t1:int = 30;
                
                private var bl_step:int = 100;
                
                private var t_interval:int = 500;
                private var phase:int = 1;
		
		public function Hanabi()
		{
			init();
		}
		
		private function init():void
		{
			_particles = [];
			_canvas = new BitmapData(WIDTH, HEIGH, false, 0x0);
			addChild(new Bitmap(_canvas)) as Bitmap;
			
			/*
                           _glow = new BitmapData(WIDTH/4, HEIGH/4, false, 0x0);
			var bm:Bitmap = addChild(new Bitmap(_glow, PixelSnapping.NEVER, true)) as Bitmap;
			bm.scaleX = bm.scaleY = 4;
			bm.blendMode = BlendMode.ADD;
			*/
			_rect = new Rectangle(0, 0, WIDTH, HEIGH);
			cTra = new ColorTransform(.8, .8, .9, 1.0);
			
			this.stage.addEventListener(Event.ENTER_FRAME, enterframeHandler);
			
			timer = new Timer(6);
			timer.addEventListener(TimerEvent.TIMER, resetFunc);
			timer.start();
		}
		
		private function resetFunc(e:TimerEvent):void
		{
			hanabi();
		}

//弾生成　一周終わったらfalse返す。
                  private function bulletgenerate01():Boolean{
                       if (bl_step>0){
                            //var angle:Number = t0+bl_step*100;//((t0%bl_step)*Math.PI*2 )/bl_step;
                            var angle:Number = ((t0%bl_step)*Math.PI*2 )/bl_step;
                            createParticle(angle);
                            createParticle((angle+Math.PI)%(Math.PI*2));
                        }
                        
                        if (t0%bl_step==0) bl_step--;
                        
                        if(bl_step <=0) {
/*                            t_interval--;
                            if (t_interval <=0) {
                                t_interval = 500;
                                bl_step =100;
                            }*/
                            return false;
                        }

return true; 
                  }
		
		private function hanabi():void 
		{
                    
                        sx = 233;
                        sy = 233;
                        
                       t0++;
                    
                        switch (phase){
                        case 0: if(!bulletgenerate01()) {
                                    phase++;
                                    t0  =0
                                }
                                break;
                        case 1: 
                                 var angle:Number = (t0+t0/t1);// +t1*t1/20 -t1*t1*t1/40);
                                 createParticle(angle);

if(t0%20==0) t1--;
                                 if (t0==2500) {
                                     phase =0;
                                     t1 = 300
                                     t0  = 0;
                                }
                                break;

default:break;
                        }

}
                
                private function createParticle(angle:Number):void{
                    var p:Particle = new Particle();
                        p.x = 233;
                        p.y = 233;
                        p.vx = Math.cos(angle) *2;
                        p.vy = Math.sin(angle) *2;
                        _particles.push(p);
		}

private function enterframeHandler(e:Event):void
		{
			update();
		}
		
		private function update():void {
			_canvas.lock();
			//_canvas.applyFilter(_canvas, _rect, new Point(), new BlurFilter(1, 1));
			_canvas.colorTransform(_rect, cTra);
			var i:int = _particles.length;
			while (i--) {
				var p:Particle = _particles[i];
				//p.vy += 0.02;
				p.vx *= 0.995;
				p.vy *= 0.995;
				p.x += p.vx;
				p.y += p.vy;
				_canvas.setPixel32(p.x, p.y, p.c);
				if ((p.x > stage.stageWidth || p.x < 0) || (p.y < 0 || p.y > stage.stageHeight) || Math.abs(p.vx) < .01 || Math.abs(p.vy) < .01)
				{
					this._particles.splice(i, 1);
				}
			}
			_canvas.unlock();
			_glow.draw(_canvas, new Matrix(0.25, 0, 0, 0.25));
		}
	}
}

class Particle
{
	public var x:Number;
	public var y:Number;
	public var vx:Number;
	public var vy:Number;
	public var c:uint;
	
	public function Particle()
	{
		this.x = 0;
		this.y = 0;
		this.vx = 0;
		this.vy = 0;
		this.c = 0xFFFFFFFF;
	}
}