/*
写真の中の人ををゾンビっぽくします。
        
写真：	Business meeting
	http://www.flickr.com/photos/llawliet/2547595587/
	Uploaded on June 3, 2008 by llawliet
	http://creativecommons.org/licenses/by/3.0/deed.ja
*/

package
{
	import flash.display.Sprite;
	import flash.display.Loader;
	import flash.display.DisplayObject;
	import flash.display.Bitmap;
	import flash.display.BitmapData;
	import flash.net.URLRequest;
	import flash.events.Event;
	import flash.events.IOErrorEvent;
        import flash.system.*;

public class zombi extends Sprite
	{
		private var loader:Loader;
		public function zombi():void
		{
                        var context:LoaderContext = new LoaderContext(true);
			var url:String = "http://farm4.static.flickr.com/3027/2547595587_880720367e_m.jpg";
			loader = new Loader();
			loader.load(new URLRequest(url),context);
			loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onLoadComplete);
			loader.addEventListener(IOErrorEvent.IO_ERROR, onLoadError);
		}
		
		//画像ロードに失敗したとき
		private function onLoadError(event:IOErrorEvent):void
		{
			//trace("load error!");
		}
		
		//画像ロード完了時
		private function onLoadComplete(event:Event):void
		{
			var SrcBmd:BitmapData = new BitmapData(loader.width, loader.height);
			SrcBmd.draw(loader);
			addChild(loader);

//ピクセル単位でRGBを調べる
			for (var py:uint = 0; py <= SrcBmd.height; py++) {
				for (var px:uint = 0; px <= SrcBmd.width; px++) {
					var RGB:uint = SrcBmd.getPixel(px, py);
					var HSV:Array = RGBtoHSV(RGB);
					//肌色なら
					if ( HSV[0] != -1 && HSV[0] < 40 ) {
						var ZombiRGB:Array = HSVtoRGB(120, HSV[1], HSV[2]);
						SrcBmd.setPixel(px, py, (ZombiRGB[0]<<16)|(ZombiRGB[1]<<8)|(ZombiRGB[2]));
					}
				}
			}
			
			var DestBmp:Bitmap = new Bitmap(SrcBmd);
			DestBmp.y = SrcBmd.height;
			addChild(DestBmp);
		}
		
		//RGBからHSVに変換 Wikipedia参照
		//http://ja.wikipedia.org/wiki/HSV%E8%89%B2%E7%A9%BA%E9%96%93
		private function RGBtoHSV (RGB:uint):Array
		{
			var Hue:Number, Saturation:Number, Value:Number;
			var Red:Number = (RGB >> 16)/0xFF;
			var Green:Number = ((RGB >> 8) & 0xFF)/0xFF;
			var Blue :Number = (RGB & 0xFF)/0xFF;
			var Max:Array = MAX(Red, Green, Blue);
			var Min:Array = MIN(Red, Green, Blue);
			
			//Hueを求める
			if (Max[0] == 0 || Max[0] - Min[0] == 0) {
				Hue = -1;
			}else if (Max[1] == 1) {	//Red
				Hue = 60 * (Green - Blue) / (Max[0] - Min[0]) + 0;
			}else if (Max[1] == 2) {	//Green
				Hue = 60 * (Blue - Red) / (Max[0] - Min[0]) + 120;
			}else if (Max[1] == 3) {	//Blue
				Hue = 60 * (Red - Green) / (Max[0] - Min[0]) + 240;
			}
			if (Hue < 0) Hue += 360;
			//Saturationを求める
			Saturation = (Max[0] - Min[0]) / Max[0];
			//Valueを求める
			Value = Max[0];
			
			return [Hue, Saturation, Value];
		}
		
		//最大値
		private function MAX (Num1:Number, Num2:Number, Num3:Number):Array
		{
			var Color :uint = 1;//（R=1 G=2 B=3）
			var Max:Number = Num1;
			if (Num2 > Max) {
				Max = Num2;
				Color = 2;
			}
			if (Num3 > Max) {
				Max = Num3;
				Color = 3;
			}
			return [Max, Color];
		}
		
		//最小値
		private function MIN (Num1:Number, Num2:Number, Num3:Number):Array
		{
			var Color :uint = 1;//（R=1 G=2 B=3）
			var Min:Number = Num1;
			if (Num2 < Min) {
				Min = Num2;
				Color = 2;
			}
			if (Num3 < Min) {
				Min= Num3;
				Color = 3;
			}
			return [Min, Color];
		}

//HSVからRGBに変換　ここから拝借
		//http://www.libspark.org/browser/as3/AbstractUI/trunk/libs/org/libspark/utils/ColorUtil.as?rev=1732
		public static function HSVtoRGB( h:Number, s:Number, v:Number ):Array
		{
			var r:Number=0, g:Number=0, b:Number=0;
			var i:Number, x:Number, y:Number, z:Number;
			h /= 60;
			i = h >> 0;
			x = v * (1 - s);
			y = v * (1 - s * (h - i));
			z = v * (1 - s * (1 - h + i));
			switch(i){
				case 0 : r=v; g=z; b=x; break;
				case 1 : r=y; g=v; b=x; break;
				case 2 : r=x; g=v; b=z; break;
				case 3 : r=x; g=y; b=v; break;
				case 4 : r=z; g=x; b=v; break;
				case 5 : r=v; g=x; b=y; break;
			}
			return [ r*255>>0, g*255>>0, b*255>>0 ];
		}
	}
}

かゆうま