Forked from:: nitoyon's Hello Snow!!!

Explosion

Hellow Snow!!!

forked:15
favorite:29
lines:132
license : MIT License
modified : 2008-12-29 01:27:44

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// forked from nitoyon's Hello Snow!!!
// Hellow Snow!!!
// forked from Saqoosha's Snow
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.MouseEvent;
	import flash.filters.BlurFilter;
	import flash.geom.Matrix;
	import flash.geom.Point;
	import flash.geom.Rectangle;
	import flash.text.TextField;
	import flash.text.TextFieldAutoSize;
	import flash.text.TextFormat;

[SWF(width=465, height=465, backgroundColor=0x0, frameRate=120)]

public class HelloSnow extends Sprite {
		private static const WIND_X:Number = 40;
		private static const WIND_Y:Number = -15;
		private static const GRAVITY:Number = 10;
		private static const START_Y:Number = 200;
		
		private var _canvas:BitmapData;
		private var _textBmp:BitmapData;
		private var _glow:BitmapData;
		private var _glowMtx:Matrix;
		private var _snow:Array;
		private var _snow_prepare:Array;
		private var _text:TextField;
		private var _log:TextField;
		
		public function HelloSnow() {
			stage.scaleMode = "noScale";

_text = new TextField();
			_text.defaultTextFormat = new TextFormat('Verdana', 48, 0xffffffff, true); 
			_text.autoSize = "left";
			_text.text = "Wonderfl!!!";
			_text.x = (465 - _text.width) / 2;
			_text.y = (465 - _text.height) /2;
			_textBmp = new BitmapData(465, 465, false, 0x000000);
			this._canvas = new BitmapData(465, 465, false, 0x000000);
			this.addChild(new Bitmap(this._canvas));

this._snow = [];
			this._snow_prepare = [];

this._glow = new BitmapData(465 / 4, 465 / 4, false, 0x0); // キラキラを描く用のん。カンバスの 4 分の 1 のサイズ
			var bm:Bitmap = this.addChild(new Bitmap(this._glow, PixelSnapping.NEVER, true)) as Bitmap; // smoothing を true にして配置
			bm.scaleX = bm.scaleY = 4; // 4 倍にする。
			bm.blendMode = BlendMode.ADD; // 加算モードで合成
			this._glowMtx = new Matrix(0.25, 0, 0, 0.25);

this.addEventListener(Event.ENTER_FRAME, this.update);
			
			this.init();
			
			
			this._log = this.addChild(new TextField()) as TextField;
			this._log.defaultTextFormat = new TextFormat('Verdana', 12, 0xffffff, true);
			this._log.width = 100;
		}

public function init():void {
			_textBmp.draw(_text, _text.transform.matrix);

var rect:Rectangle = _textBmp.getColorBoundsRect(0xffffff, 0x0, false);
			for(var x:int = rect.left; x <= rect.right; x++){
				for(var y:int = rect.top; y <= rect.bottom; y++){
					var col:uint = _textBmp.getPixel(x, y);
					if(col != 0x000000){
						var p:SnowParticle = new SnowParticle(x, y, col, 0, 0);
						_snow_prepare.push(p);
						_snow.push(p);
					}
				}
			}
			this.stage.addEventListener(MouseEvent.CLICK, this._onClick);
		}
		
		public function _onClick(e:MouseEvent):void {
			// emit
			var n:int = this._snow_prepare.length;//Math.min(20, _snow_prepare.length);
			var mx:int = this.stage.mouseX;
			var my:int = this.stage.mouseY;
			for(var i:int = 0; i < n; i++){
//				var index:int = Math.random() * Math.min(30, _snow_prepare.length);
//				var particle:SnowParticle = _snow_prepare[index];
				var p:SnowParticle = this._snow_prepare[i];
				var dx:Number = p.x - mx + Math.random() * 5;
				var dy:Number = p.y - my + Math.random() * 5;
				var d:Number = dx * dx + dy * dy;
				var sqd:Number = Math.sqrt(d);
				var r:Number = Math.random() * 1 + 0.2;
				p.ax = dx / sqd * r;
				p.ay = dy / sqd * r;
				r = Math.random() * 2;
				p.vx = p.ax * r;
				p.vy = p.ay * r;
//				_textBmp.setPixel(p.x, p.y, 0x000000);
			}
			this._snow_prepare = [];
		}
		
		// 雪を動かすよーー
		public function update(e:Event):void {
			this._canvas.lock(); // いっぱい setPixel するときは必ず lock しよう
			this._canvas.fillRect(this._canvas.rect, 0x0); // カンバスをクリア
//			this._canvas.copyPixels(_textBmp, _textBmp.rect, new Point(0, 0));
			var n:int = this._snow.length;
			var d:Number = 1.0;
//			var wind_x:Number = (Math.random() > .4 ? WIND_X : 0) / 1000;
//			var wind_y:Number = (GRAVITY + (Math.random() > .6 ? WIND_Y : WIND_Y / 2)) / 1000;
			while (n--) {
				var p:SnowParticle = this._snow[n];
				p.vx += p.ax;
				p.vy += p.ay;
				p.vx *= 0.99; // 空気抵抗
				p.vy *= 0.99; // y 方向にも
				p.x += p.vx; // 動かす
				p.y += p.vy;
				this._canvas.setPixel(p.x, p.y, p.c); // 雪 1 粒描く
				if (p.y < 0 || this.stage.stageHeight < p.y ||  p.x < 0 || this.stage.stageWidth < p.x) { // もし画面外にでちゃったら
					this._snow.splice(n, 1); // とりのぞく
				}
			}
			this._canvas.unlock(); // lock したやつは必ず unlock
			this._glow.draw(this._canvas, this._glowMtx); // キラキラを描く
			
			//
			this._log.text = String(this._snow.length);
			if(_snow.length == 0){
				this.init();
			}
		}
	}
}

class SnowParticle {
	
	public var x:Number;
	public var y:Number;
	public var vx:Number;
	public var vy:Number;
	public var ax:Number;
	public var ay:Number;
	public var c:int;
	
	public function SnowParticle(x:Number, y:Number, color:uint, vx:Number, vy:Number) {
		this.x = x;
		this.y = y;
		this.vx = vx;
		this.vy = vy;
		this.ax = 0;
		this.ay = 0;
		this.c = color;
	}
}

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