/**
* Color functions
* @namespace color
* @class Color
*/
ludo.color.Color = new Class({
rgbColors:function (a) {
if (a.substr !== undefined) {
return this.rgbObject(a);
}
if (a.h !== undefined) {
return this.hsvToRGB(a.h, a.s, a.v);
}
return undefined;
},
/**
Converts rgb color string to rgb color object
@method rgbObject
@param {String} rgbColor
@return {Object}
@example
var c = new ludo.color.Color();
console.log(c.rgbObject('#FFEEDD'); // returns { 'r': 'FF','g' : 'EE', 'b' : 'DD' }
*/
rgbObject:function (rgbColor) {
rgbColor = rgbColor.replace('#', '');
return {
r:rgbColor.substr(0, 2).toInt(16),
g:rgbColor.substr(2, 2).toInt(16),
b:rgbColor.substr(4, 2).toInt(16)
};
},
/**
* Converts RGB or HSV color object to rgb code
* @method rgbCode
* @param a
* @param b
* @param c
* @return {String}
*/
rgbCode:function (a, b, c) {
if (b === undefined) {
if (a.r !== undefined) {
b = a.g;
c = a.b;
a = a.r;
}
else if (a.h !== undefined) {
var color = this.hsvToRGB(a.h, a.s, a.v);
a = color.r;
b = color.g;
c = color.b;
}
}
return this.toRGB(a, b, c);
},
/**
* Converts rgb object to rgb string
* @method toRGB
* @param {Number} red
* @param {Number} green
* @param {Number} blue
* @return {String}
*/
toRGB:function (red, green, blue) {
var r = Math.round(red).toString(16);
var g = Math.round(green).toString(16);
var b = Math.round(blue).toString(16);
if (r.length === 1)r = ['0', r].join('');
if (g.length === 1)g = ['0', g].join('');
if (b.length === 1)b = ['0', b].join('');
return ['#', r, g, b].join('').toUpperCase();
},
toRGBFromObject:function (color) {
return this.toRGB(color.r, color.g, color.b);
},
toHSV:function (color) {
if (color.r === undefined)color = this.rgbObject(color);
return this.toHSVFromRGB(color.r, color.g, color.b);
},
toHSVFromRGBCode:function (rgbColor) {
var color = this.rgbObject(rgbColor);
return this.toHSVFromRGB(color.r, color.g, color.b);
},
/**
* Converts red,green and blue to hsv h,s v
* @method toHSVFromRGB
* @param r
* @param g
* @param b
* @return {Object}
*/
toHSVFromRGB:function (r, g, b) {
r = r / 255;
g = g / 255;
b = b / 255;
var max = Math.max(r, g, b), min = Math.min(r, g, b);
var h, s;
var d = max - min;
s = max == 0 ? 0 : d / max;
if (max == min) {
h = 0;
} else {
switch (max) {
case r:
h = (g - b) / d + (g < b ? 6 : 0);
break;
case g:
h = (b - r) / d + 2;
break;
case b:
h = (r - g) / d + 4;
break;
}
h /= 6;
}
return {
h:h * 360,
s:s * 100,
v:max * 100
};
},
hsvToRGBCode:function (h, s, v) {
if (s === undefined) {
s = h.s;
v = h.v;
h = h.h;
}
var rgb = this.hsvToRGB(h, s, v);
return this.toRGB(rgb.r, rgb.g, rgb.b);
},
hsvToRGB:function (h, s, v) {
if (s === undefined) {
s = h.s;
v = h.v;
h = h.h;
}
h /= 360;
s /= 100;
v /= 100;
var r, g, b;
var i = Math.floor(h * 6);
var f = h * 6 - i;
var p = v * (1 - s);
var q = v * (1 - f * s);
var t = v * (1 - (1 - f) * s);
switch (i % 6) {
case 0:
r = v;
g = t;
b = p;
break;
case 1:
r = q;
g = v;
b = p;
break;
case 2:
r = p;
g = v;
b = t;
break;
case 3:
r = p;
g = q;
b = v;
break;
case 4:
r = t;
g = p;
b = v;
break;
case 5:
r = v;
g = p;
b = q;
break;
}
return{
r:r * 255,
g:g * 255,
b:b * 255
};
},
hslToRgb:function (h, s, l) {
var r, g, b;
if (s == 0) {
r = g = b = l; // achromatic
} else {
function hue2rgb(p, q, t) {
if (t < 0) t += 1;
if (t > 1) t -= 1;
if (t < 1 / 6) return p + (q - p) * 6 * t;
if (t < 1 / 2) return q;
if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6;
return p;
}
var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
var p = 2 * l - q;
r = hue2rgb(p, q, h + 1 / 3);
g = hue2rgb(p, q, h);
b = hue2rgb(p, q, h - 1 / 3);
}
return { r:r * 255, g:g * 255, b:b * 255 }
},
/**
* Return rgb code after hue has been adjusted by a number of degrees
* @method offsetHue
* @param color
* @param offset
* @return {String}
*/
offsetHue:function(color, offset){
var hsv = this.toHSV(color);
hsv.h += offset;
if(hsv.h >= 360) hsv.h -= 360;
return this.rgbCode(hsv);
},
/**
* Return rgb code after hue has been adjusted by a number of degrees
* @method offsetBrightness
* @param color
* @param offset
* @return {String}
*/
offsetBrightness:function(color, offset){
var hsv = this.toHSV(color);
hsv.v += offset;
if(hsv.v > 100) hsv.v = 100;
if(hsv.v < 0)hsv.v = 0;
return this.rgbCode(hsv);
},
/**
* Return rgb code after hue has been adjusted by a number of degrees
* @method offsetSaturation
* @param color
* @param offset
* @return {String}
*/
offsetSaturation:function(color, offset){
var hsv = this.toHSV(color);
hsv.s += offset;
if(hsv.s > 100) hsv.s = 100;
if(hsv.s < 0)hsv.s = 0;
return this.rgbCode(hsv);
},
brighten:function(color, percent){
var hsv = this.toHSV(color);
color = this.offsetBrightness(color, hsv.v * percent/100);
color = this.offsetSaturation(color, hsv.s * percent/100 * -1);
return color;
},
darken:function(color, percent){
var hsv = this.toHSV(color);
color = this.offsetBrightness(color, hsv.v * percent/100 * -1);
color = this.offsetSaturation(color, hsv.s * percent/100);
return color;
}
});
