// forked from nondelion's forked from: Snow
// forked from Saqoosha's Snow
package {
    
        /*
         * 少し変えてみた
         */
	
	import flash.display.Bitmap;
	import flash.display.BitmapData;
	import flash.display.Sprite;
	import flash.geom.Point;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.text.TextField;
	import flash.text.TextFormat;
	import flash.text.TextFieldAutoSize;
	import flash.utils.Dictionary;
	import net.hires.debug.Stats;

[SWF(width=465, height=465, backgroundColor=0x0, frameRate=90)]

public class TextTransition extends Sprite
	{
		private var bd:BitmapData;
		private var canvas:BitmapData;
		private var particles:Dictionary;
		private var bdp:Point;

protected const RANGE:Number = 10000;
		protected const APPEAR_RAPGE:Number = 50;
		
		public function TextTransition()
		{
			canvas = new BitmapData(465, 465, true, 0xff000000);
			addChild( new Bitmap( canvas ) );
			
			var tf:TextField = new TextField();
			tf.defaultTextFormat = new TextFormat('Helvetica', 48, 0xffd400, true);
			tf.autoSize = TextFieldAutoSize.LEFT;
			tf.text = 'Wonderfl!!';
			
			bd = new BitmapData(tf.width, tf.height, false, 0x0);
			bd.draw(tf);
			bdp = new Point( Math.floor( (465 - tf.width) / 2 ), Math.floor( (465 - tf.height) / 2 ) );
			
			particles = new Dictionary();
			
			for (var i:int=0; i < tf.width; i++) {
				for (var j:int=0; j < tf.height; j++) {
					var color:uint = bd.getPixel(i, j);
					if ( color != 0x0 ) {
						var p:Particle = new Particle();
						p.x = i + bdp.x;
						p.y = j + bdp.y;
						p.cx = Math.random() * RANGE - RANGE/2;
						p.cy = Math.random() * RANGE - RANGE/2;
						p.vx = 6;
						p.vy = 6;
						p.color = color;
						particles[p] = true;
					}
				}
			}

//this.addChild(new Stats());
			
			addEventListener( Event.ENTER_FRAME, update );
			stage.addEventListener( MouseEvent.CLICK, clickHandler );
		}
		
		private function clickHandler(e:MouseEvent):void
		{
			canvas.lock();
			canvas.fillRect(canvas.rect, 0x0);
			for (var key:* in particles) {
				var p:Particle = Particle(key);
				p.cx = Math.random() * RANGE - RANGE/2;
				p.cy = Math.random() * RANGE - RANGE/2;
				canvas.setPixel(p.cx, p.cy, p.color);
			}
			canvas.unlock();
		}
		
		private function update(e:Event):void
		{
			canvas.lock();
			canvas.fillRect(canvas.rect, 0x0);
			
			for (var key:* in particles) {
				var p:Particle = Particle(key);
                                var r = Math.sqrt((p.x-p.cx)*(p.x-p.cx) + (p.y-p.cy)*(p.y-p.cy));
				p.cx += (p.x - p.cx )/p.vx;
				p.cy += (p.y - p.cy )/p.vy;
				if ( Math.abs( p.cx - p.x ) <= 1 && Math.abs( p.cy - p.y) <= 1) {
					p.cx = p.x;
					p.cy = p.y;
				}
                                var a:uint = r < APPEAR_RAPGE ? (1-r/APPEAR_RAPGE)*255 : 0;
				var c:uint = p.color + (a << 24);
				canvas.setPixel32(p.cx, p.cy, c);
			}
			canvas.unlock();
		}	
	}
}

class Particle
	{
		public var color:int;
		public var x:Number;
		public var y:Number;
		public var cx:Number;
		public var cy:Number;
		public var vx:Number;
		public var vy:Number;
		
		public function Particle()
		{
			color = 0xffffff;
			x = 0;
			y = 0;
			cx = 0;
			cy = 0;
			vx = 0;
			vy = 0;
		}
	}