/*
	Copyright (c) 2004-2008, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/book/dojo-book-0-9/introduction/licensing
*/


if(!dojo._hasResource["dojox.color._base"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojox.color._base"] = true;
dojo.provide("dojox.color._base");
dojo.require("dojo.colors");

//	alias all the dojo.Color mechanisms
dojox.color.Color=dojo.Color;
dojox.color.blend=dojo.blendColors;
dojox.color.fromRgb=dojo.colorFromRgb;
dojox.color.fromHex=dojo.colorFromHex;
dojox.color.fromArray=dojo.colorFromArray;
dojox.color.fromString=dojo.colorFromString;

//	alias the dojo.colors mechanisms
dojox.color.greyscale=dojo.colors.makeGrey;

//	static methods
dojo.mixin(dojox.color, {
	fromCmy: function(/* Object|Array|int */cyan, /*int*/magenta, /*int*/yellow){
		//	summary
		//	Create a dojox.color.Color from a CMY defined color.
		//	All colors should be expressed as 0-100 (percentage)

		if(dojo.isArray(cyan)){
			magenta=cyan[1], yellow=cyan[2], cyan=cyan[0];
		} else if(dojo.isObject(cyan)){
			magenta=cyan.m, yellow=cyan.y, cyan=cyan.c;
		}
		cyan/=100, magenta/=100, yellow/=100;

		var r=1-cyan, g=1-magenta, b=1-yellow;
		return new dojox.color.Color({ r:Math.round(r*255), g:Math.round(g*255), b:Math.round(b*255) });	//	dojox.color.Color
	},

	fromCmyk: function(/* Object|Array|int */cyan, /*int*/magenta, /*int*/yellow, /*int*/black){
		//	summary
		//	Create a dojox.color.Color from a CMYK defined color.
		//	All colors should be expressed as 0-100 (percentage)

		if(dojo.isArray(cyan)){
			magenta=cyan[1], yellow=cyan[2], black=cyan[3], cyan=cyan[0];
		} else if(dojo.isObject(cyan)){
			magenta=cyan.m, yellow=cyan.y, black=cyan.b, cyan=cyan.c;
		}
		cyan/=100, magenta/=100, yellow/=100, black/=100;
		var r,g,b;
		r = 1-Math.min(1, cyan*(1-black)+black);
		g = 1-Math.min(1, magenta*(1-black)+black);
		b = 1-Math.min(1, yellow*(1-black)+black);
		return new dojox.color.Color({ r:Math.round(r*255), g:Math.round(g*255), b:Math.round(b*255) });	//	dojox.color.Color
	},
	
	fromHsl: function(/* Object|Array|int */hue, /* int */saturation, /* int */luminosity){
		//	summary
		//	Create a dojox.color.Color from an HSL defined color.
		//	hue from 0-359 (degrees), saturation and luminosity 0-100.

		if(dojo.isArray(hue)){
			saturation=hue[1], luminosity=hue[2], hue=hue[0];
		} else if(dojo.isObject(hue)){
			saturation=hue.s, luminosity=hue.l, hue=hue.h;
		}
		saturation/=100;
		luminosity/=100;

		while(hue<0){ hue+=360; }
		while(hue>=360){ hue-=360; }
		
		var r, g, b;
		if(hue<120){
			r=(120-hue)/60, g=hue/60, b=0;
		} else if (hue<240){
			r=0, g=(240-hue)/60, b=(hue-120)/60;
		} else {
			r=(hue-240)/60, g=0, b=(360-hue)/60;
		}
		
		r=2*saturation*Math.min(r, 1)+(1-saturation);
		g=2*saturation*Math.min(g, 1)+(1-saturation);
		b=2*saturation*Math.min(b, 1)+(1-saturation);
		if(luminosity<0.5){
			r*=luminosity, g*=luminosity, b*=luminosity;
		}else{
			r=(1-luminosity)*r+2*luminosity-1;
			g=(1-luminosity)*g+2*luminosity-1;
			b=(1-luminosity)*b+2*luminosity-1;
		}
		return new dojox.color.Color({ r:Math.round(r*255), g:Math.round(g*255), b:Math.round(b*255) });	//	dojox.color.Color
	},
	
	fromHsv: function(/* Object|Array|int */hue, /* int */saturation, /* int */value){
		//	summary
		//	Create a dojox.color.Color from an HSV defined color.
		//	hue from 0-359 (degrees), saturation and value 0-100.

		if(dojo.isArray(hue)){
			saturation=hue[1], value=hue[2], hue=hue[0];
		} else if (dojo.isObject(hue)){
			saturation=hue.s, value=hue.v, hue=hue.h;
		}
		
		if(hue==360){ hue=0; }
		saturation/=100;
		value/=100;
		
		var r, g, b;
		if(saturation==0){
			r=value, b=value, g=value;
		}else{
			var hTemp=hue/60, i=Math.floor(hTemp), f=hTemp-i;
			var p=value*(1-saturation);
			var q=value*(1-(saturation*f));
			var t=value*(1-(saturation*(1-f)));
			switch(i){
				case 0:{ r=value, g=t, b=p; break; }
				case 1:{ r=q, g=value, b=p; break; }
				case 2:{ r=p, g=value, b=t; break; }
				case 3:{ r=p, g=q, b=value; break; }
				case 4:{ r=t, g=p, b=value; break; }
				case 5:{ r=value, g=p, b=q; break; }
			}
		}
		return new dojox.color.Color({ r:Math.round(r*255), g:Math.round(g*255), b:Math.round(b*255) });	//	dojox.color.Color
	}
});

//	Conversions directly on dojox.color.Color
dojo.extend(dojox.color.Color, {
	toCmy: function(){
		//	summary
		//	Convert this Color to a CMY definition.
		var cyan=1-(this.r/255), magenta=1-(this.g/255), yellow=1-(this.b/255);
		return { c:Math.round(cyan*100), m:Math.round(magenta*100), y:Math.round(yellow*100) };		//	Object
	},
	
	toCmyk: function(){
		//	summary
		//	Convert this Color to a CMYK definition.
		var cyan, magenta, yellow, black;
		var r=this.r/255, g=this.g/255, b=this.b/255;
		black = Math.min(1-r, 1-g, 1-b);
		cyan = (1-r-black)/(1-black);
		magenta = (1-g-black)/(1-black);
		yellow = (1-b-black)/(1-black);
		return { c:Math.round(cyan*100), m:Math.round(magenta*100), y:Math.round(yellow*100), b:Math.round(black*100) };	//	Object
	},
	
	toHsl: function(){
		//	summary
		//	Convert this Color to an HSL definition.
		var r=this.r/255, g=this.g/255, b=this.b/255;
		var min = Math.min(r, b, g), max = Math.max(r, g, b);
		var delta = max-min;
		var h=0, s=0, l=(min+max)/2;
		if(l>0 && l<1){
			s = delta/((l<0.5)?(2*l):(2-2*l));
		}
		if(delta>0){
			if(max==r && max!=g){
				h+=(g-b)/delta;
			}
			if(max==g && max!=b){
				h+=(2+(b-r)/delta);
			}
			if(max==b && max!=r){
				h+=(4+(r-g)/delta);
			}
			h*=60;
		}
		return { h:h, s:Math.round(s*100), l:Math.round(l*100) };	//	Object
	},

	toHsv: function(){
		//	summary
		//	Convert this Color to an HSV definition.
		var r=this.r/255, g=this.g/255, b=this.b/255;
		var min = Math.min(r, b, g), max = Math.max(r, g, b);
		var delta = max-min;
		var h = null, s = (max==0)?0:(delta/max);
		if(s==0){
			h = 0;
		}else{
			if(r==max){
				h = 60*(g-b)/delta;
			}else if(g==max){
				h = 120 + 60*(b-r)/delta;
			}else{
				h = 240 + 60*(r-g)/delta;
			}

			if(h<0){ h+=360; }
		}
		return { h:h, s:Math.round(s*100), v:Math.round(max*100) };	//	Object
	}
});

}
