package
{
	
	// Tweener
	import caurina.transitions.Tweener;
	
	// Flash
	import flash.display.*;
	import flash.events.*;
	import flash.filters.*;
	import flash.text.*;
	import flash.utils.*;
	
	[SWF(width="450",height="300",frameRate="60",backgroundColor="#000000")]
	
	public class ParticlePlayGround extends Sprite
	{
		// 定数
		private const PARTICLE_ROUND   :int = 100;
		private const PARTICLE_AMOUNT  :int = 4;
		private const PARTICLE_INTERVAL:int = 20;
		private const MOUSE_INTERVAL   :int = 10;
		private const FONT_SIZE        :int = 64;
		
		// マウス追随用の変数
		private var oldX:Number;
		private var oldY:Number;
		private var world:Sprite;
		
		/**
		 * コンストラクタ 
		 */			
		public function ParticlePlayGround()
		{
			init();
		}
		
		/**
		 * 初期化 
		 * @param event
		 */		
		private function init():void
		{
			// パーティクル生成タイマー
			var particleTimer:Timer = new Timer(PARTICLE_INTERVAL);
			particleTimer.start();
			particleTimer.addEventListener(TimerEvent.TIMER, createParticle );
			
			// マウス追随タイマー
			var mouseTimer:Timer = new Timer(MOUSE_INTERVAL);
			mouseTimer.start();
			mouseTimer.addEventListener(TimerEvent.TIMER, drawMouseLine );
		}
		
		
		/**
		 * パーティクル生成 
		 * @param event
		 */		
		private function createParticle(event:TimerEvent):void
		{
			if(oldX == mouseX && oldY == mouseY) return;
			
			for(var i:int=0; i<PARTICLE_AMOUNT; i++)
			{
				var mc:MovieClip = new MovieClip();
				
				//テキストフォーマット作成
				var fontsize:int = Math.random() * FONT_SIZE | 0;
				
				var fmt:TextFormat = new TextFormat();
				fmt.size  = fontsize;
				fmt.align = TextFormatAlign.LEFT;
				fmt.color = 0xffffff * Math.random();
				
				// ランダムにアルファベットを設定(文字コードから算出)
				var charCode:uint = (Math.random() * 25) | 0 + 65;
				
				//テキストフィールド作成
				var tf:TextField = new TextField();
				tf.defaultTextFormat = fmt;
				tf.text = String.fromCharCode(charCode);
				tf.selectable = false;
				
				//表示
				mc.addChild(tf);
				mc.x = mouseX;
				mc.y = mouseY;
				
				if(fontsize > FONT_SIZE * .8)      {mc.filters = [ new BlurFilter(8, 8, 1) ];mc.blendMode = BlendMode.ADD;}
				else if(fontsize > FONT_SIZE * .6) mc.filters = [ new BlurFilter(4, 4, 1) ]
				else                               mc.filters = [ new BlurFilter(1, 1, 1) ]
				
				Tweener.addTween(mc,
				{
					x : mouseX + Math.random()*PARTICLE_ROUND - PARTICLE_ROUND/2 - (mouseX - oldX)*2,
					y : mouseY + Math.random()*PARTICLE_ROUND - PARTICLE_ROUND/2 - (mouseY - oldY)*2,
					alpha      : 0,
					time       : 3,
					transition : "easeOutExpo",
					onCompleteParams:[this, mc],
					onComplete : function(w:Sprite, obj:MovieClip):void{ w.removeChild(obj) }
				});
				
				this.addChild(mc);
				
			}
		}
		
		/**
		 * マウス追随を描画 
		 * @param event
		 */		
		private function drawMouseLine(event:TimerEvent):void
		{
			
			var sp:Sprite = new Sprite();
			sp.graphics.lineStyle(1, 0x0099CC);
			sp.graphics.moveTo(oldX, oldY);
			sp.graphics.lineTo(mouseX, mouseY);
			addChild(sp);
			
			oldX = mouseX;
			oldY = mouseY;
			
			Tweener.addTween(sp,
			{
				alpha      : 0,
				time       : 3,
				onComplete : function():void{ removeChild(sp); }
			});
			
		}
	}
}