/**
 * AverageColorColorクラス
 * カラーの平均を算出
 *
 * @author		scratchbrain
 * @version		1.0.0
 * @update      2007/12/19
 * @web site    http://www.scratchbrain.net/
 * @blog        http://www.scratchbrain.net/blog/ver2/
 *
 * Licensed under the MIT License
 * Copyright (c) 2008 scratchbrain
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package net.scratchbrain.color
{
	import net.scratchbrain.color.AverageColor;
	public class AverageColor
	{
		
		public static function averageHex(_hex1:uint,_hex2:uint):uint
		{
			var rgb1:Object = ConvertColor.HexToRGB(_hex1);
			var rgb2:Object = ConvertColor.HexToRGB(_hex2);
			var hsb1:Object = ConvertColor.RGBToHSB(rgb1.r,rgb1.g,rgb1.b);
			var hsb2:Object = ConvertColor.RGBToHSB(rgb2.r,rgb2.g,rgb2.b);
			return averageHsb(hsb1.h,hsb1.s,hsb1.b,hsb2.h,hsb2.s,hsb2.b);
			
		}
		public static function averageRgb(_r1:int,_g1:int,_b1:int,_r2:int,_g2:int,_b2:int):uint
		{
			var hsb1:Object = ConvertColor.RGBToHSB(_r1,_g1,_b1);
			var hsb2:Object = ConvertColor.RGBToHSB(_r2,_g2,_b2);
			return averageHsb(hsb1.h,hsb1.s,hsb1.b,hsb2.h,hsb2.s,hsb2.b);
		}
		public static function averageHsb(_h1:int,_s1:int,_b1:int,_h2:int,_s2:int,_b2:int):uint
		{
			var _h:int;
			var _s:int;
			var _b:int;
			
			// つぎの条件のとき、H==360にして計算する
			// 赤の色相0と360で結果が変わってしまうため
			/*
				カラー1
				H1<=18（赤系）
				S1!=0（グレースケール以外）
				カラー2
				H2 >= 180（青系）
			*/
			if(_h1 <= 18 && _s1 != 0 && _h2 >= 180){
				_h1 = 360;
			}
			if(_h2 <= 18 && _s2 != 0 && _h1 >= 180){
				_h2 = 360;
			}
			

			if(_s1 != 0 && _s2 != 0){
				_h = (_h1 + _h2)/2;
				_s = (_s1 + _s2)/2;
				_b = (_b1 + _b2)/2;
			}else if(_s1 == 0 && _s2 == 0){// 両方グレースケールの時
				_h = 0;
				_s = 0;
				_b = (_b1 + _b2)/2;
			}else{// 片方グレースケールの時
				_h = (_h1 != 0) ? _h1 : _h2;
				_s = (_s1 + _s2)/2;
				_b = (_b1 + _b2)/2;
			}
			
			var rgb:Object = ConvertColor.HSBToRGB(_h,_s,_b);
			return ConvertColor.RGBToHex(rgb.r,rgb.g,rgb.b);
		}
	}
}