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tinycolor.js
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// TinyColor v2.0.1
// https://github.com/chingcm/TinyColor
// Dem Ching, MIT License
// Original from TinyColor v1.4.1
// https://github.com/bgrins/TinyColor
// Brian Grinstead, MIT License
(function(Math) {
var trimLeft = /^\s+/,
trimRight = /\s+$/,
tinyCounter = 0,
mathRound = Math.round,
mathMin = Math.min,
mathMax = Math.max,
mathRandom = Math.random;
function tinycolor (color, opts) {
color = (color) ? color : '';
opts = opts || { };
// If input is already a tinycolor, return itself
if (color instanceof tinycolor) {
return color;
}
// If we are called as a function, call using new instead
if (!(this instanceof tinycolor)) {
return new tinycolor(color, opts);
}
var rgb = inputToRGB(color);
this._originalInput = color;
this._r = rgb.r;
this._g = rgb.g;
this._b = rgb.b;
this._a = rgb.a;
this._roundA = mathRound(100*this._a) / 100;
this._format = opts.format || rgb.format;
this._gradientType = opts.gradientType;
// Don't let the range of [0,255] come back in [0,1].
// Potentially lose a little bit of precision here, but will fix issues where
// .5 gets interpreted as half of the total, instead of half of 1
// If it was supposed to be 128, this was already taken care of by `inputToRgb`
if (this._r < 1) { this._r = mathRound(this._r); }
if (this._g < 1) { this._g = mathRound(this._g); }
if (this._b < 1) { this._b = mathRound(this._b); }
this._ok = rgb.ok;
this._tc_id = tinyCounter++;
}
tinycolor.prototype = {
isDark: function() {
return this.getBrightness() < 128;
},
isLight: function() {
return !this.isDark();
},
isValid: function() {
return this._ok;
},
getOriginalInput: function() {
return this._originalInput;
},
getFormat: function() {
return this._format;
},
getAlpha: function() {
return this._a;
},
getBrightness: function() {
//http://www.w3.org/TR/AERT#color-contrast
var rgb = this.toRgb();
return (rgb.r * 299 + rgb.g * 587 + rgb.b * 114) / 1000;
},
getLuminance: function() {
//http://www.w3.org/TR/2008/REC-WCAG20-20081211/#relativeluminancedef
var rgb = this.toRgb();
var RsRGB, GsRGB, BsRGB, R, G, B;
RsRGB = rgb.r/255;
GsRGB = rgb.g/255;
BsRGB = rgb.b/255;
if (RsRGB <= 0.03928) {R = RsRGB / 12.92;} else {R = Math.pow(((RsRGB + 0.055) / 1.055), 2.4);}
if (GsRGB <= 0.03928) {G = GsRGB / 12.92;} else {G = Math.pow(((GsRGB + 0.055) / 1.055), 2.4);}
if (BsRGB <= 0.03928) {B = BsRGB / 12.92;} else {B = Math.pow(((BsRGB + 0.055) / 1.055), 2.4);}
return (0.2126 * R) + (0.7152 * G) + (0.0722 * B);
},
setAlpha: function(value) {
this._a = boundAlpha(value);
this._roundA = mathRound(100*this._a) / 100;
return this;
},
toHsv: function() {
var hsv = rgbToHsv(this._r, this._g, this._b);
return { h: hsv.h * 360, s: hsv.s, v: hsv.v, a: this._a };
},
toHsvString: function() {
var hsv = rgbToHsv(this._r, this._g, this._b);
var h = mathRound(hsv.h * 360), s = mathRound(hsv.s * 100), v = mathRound(hsv.v * 100);
return (this._a == 1) ?
"hsv(" + h + ", " + s + "%, " + v + "%)" :
"hsva(" + h + ", " + s + "%, " + v + "%, "+ this._roundA + ")";
},
toHsl: function() {
var hsl = rgbToHsl(this._r, this._g, this._b);
return { h: hsl.h * 360, s: hsl.s, l: hsl.l, a: this._a };
},
toHslString: function() {
var hsl = rgbToHsl(this._r, this._g, this._b);
var h = mathRound(hsl.h * 360), s = mathRound(hsl.s * 100), l = mathRound(hsl.l * 100);
return (this._a == 1) ?
"hsl(" + h + ", " + s + "%, " + l + "%)" :
"hsla(" + h + ", " + s + "%, " + l + "%, "+ this._roundA + ")";
},
toHex: function(allow3Char) {
return rgbToHex(this._r, this._g, this._b, allow3Char);
},
toHexString: function(allow3Char) {
return '#' + this.toHex(allow3Char);
},
toHex8: function(allow4Char) {
return rgbaToHex(this._r, this._g, this._b, this._a, allow4Char);
},
toHex8String: function(allow4Char) {
return '#' + this.toHex8(allow4Char);
},
toRgb: function() {
return { r: mathRound(this._r), g: mathRound(this._g), b: mathRound(this._b), a: this._a };
},
toRgbString: function() {
return (this._a == 1) ?
"rgb(" + mathRound(this._r) + ", " + mathRound(this._g) + ", " + mathRound(this._b) + ")" :
"rgba(" + mathRound(this._r) + ", " + mathRound(this._g) + ", " + mathRound(this._b) + ", " + this._roundA + ")";
},
toPercentageRgb: function() {
return { r: mathRound(bound01(this._r, 255) * 100) + "%", g: mathRound(bound01(this._g, 255) * 100) + "%", b: mathRound(bound01(this._b, 255) * 100) + "%", a: this._a };
},
toPercentageRgbString: function() {
return (this._a == 1) ?
"rgb(" + mathRound(bound01(this._r, 255) * 100) + "%, " + mathRound(bound01(this._g, 255) * 100) + "%, " + mathRound(bound01(this._b, 255) * 100) + "%)" :
"rgba(" + mathRound(bound01(this._r, 255) * 100) + "%, " + mathRound(bound01(this._g, 255) * 100) + "%, " + mathRound(bound01(this._b, 255) * 100) + "%, " + this._roundA + ")";
},
toCmy: function() {
var cmy = rgbToCmy(this._r, this._g, this._b);
return { c: cmy.c * 100, m: cmy.m * 100, y: cmy.y * 100 };
},
toCmyString: function() {
var cmy = rgbToCmy(this._r, this._g, this._b),
c = mathRound(cmy.c * 100), m = mathRound(cmy.m * 100), y = mathRound(cmy.y * 100);
return "cmy(" + c + "%, " + m + "%, " + y + "%)";
},
toCmyk: function() {
var cmyk = rgbToCmyk(this._r, this._g, this._b);
return { c: cmyk.c * 100, m: cmyk.m * 100, y: cmyk.y * 100, k: cmyk.k * 100 };
},
toCmykString: function() {
var cmyk = rgbToCmyk(this._r, this._g, this._b),
c = mathRound(cmyk.c * 100), m = mathRound(cmyk.m * 100), y = mathRound(cmyk.y * 100), k = mathRound(cmyk.k * 100);
return "cmyk(" + c + "%, " + m + "%, " + y + "%, " + k + "%)";
},
toHwb: function() {
var hwb = rgbToHwb(this._r, this._g, this._b);
return { h: hwb.h * 360, w: hwb.w, b: hwb.b, a: this._a };
},
toHwbString: function() {
var hwb = rgbToHwb(this._r, this._g, this._b);
var h = mathRound(hwb.h * 360), w = mathRound(hwb.w * 100), b = mathRound(hwb.b * 100);
return (this._a == 1) ?
"hwb(" + h + ", " + w + "%, " + b + "%)" :
"hwba(" + h + ", " + w + "%, " + b + "%, "+ this._roundA + ")";
},
toNcol: function() {
var ncol = rgbToNcol(this._r, this._g, this._b);
return { n: ncol.n, w: ncol.w, b: ncol.b, a: this._a };
},
toNcolString: function() {
var ncol = rgbToNcol(this._r, this._g, this._b);
var n = ncol.n, w = mathRound(ncol.w * 100), b = mathRound(ncol.b * 100);
return (this._a == 1) ?
n + ", " + w + "%, " + b + "%" :
n + ", " + w + "%, " + b + "%, "+ this._roundA;
},
toNcs: function() {
var ncs = rgbToNcs(this._r, this._g, this._b);
return { s: ncs.s, c: ncs.c, n: ncs.n.toUpperCase() };
},
toNcsString: function() {
var ncs = rgbToNcs(this._r, this._g, this._b);
return ncsToString(ncs.s, ncs.c, ncs.n);
},
toXyz: function() {
var xyz = rgbToXyz(this._r, this._g, this._b);
return { x: xyz.x * 100, y: xyz.y * 100, z: xyz.z * 100 };
},
toXyzString: function() {
var xyz = rgbToXyz(this._r, this._g, this._b),
x = (xyz.x * 100).toFixed(2), y = (xyz.y * 100).toFixed(2), z = (xyz.z * 100).toFixed(2);
return "xyz(" + x + ", " + y + ", " + z + ")";
},
toLab: function() {
var lab = rgbToLab(this._r, this._g, this._b);
return { l: lab.l, a: lab.a, b: lab.b };
},
toLabString: function() {
var lab = rgbToLab(this._r, this._g, this._b),
l = lab.l.toFixed(2), a = lab.a.toFixed(2), b = lab.b.toFixed(2);
return "lab(" + l + ", " + a + ", " + b + ")";
},
toName: function() {
if (this._a === 0) {
return "transparent";
}
if (this._a < 1) {
return false;
}
return hexNames[rgbToHex(this._r, this._g, this._b, true)] || false;
},
toFilter: function(secondColor) {
var hex8String = '#' + rgbaToArgbHex(this._r, this._g, this._b, this._a);
var secondHex8String = hex8String;
var gradientType = this._gradientType ? "GradientType = 1, " : "";
if (secondColor) {
var s = tinycolor(secondColor);
secondHex8String = '#' + rgbaToArgbHex(s._r, s._g, s._b, s._a);
}
return "progid:DXImageTransform.Microsoft.gradient("+gradientType+"startColorstr="+hex8String+",endColorstr="+secondHex8String+")";
},
toString: function(format) {
var formatSet = !!format;
format = format || this._format;
var formattedString = false;
var hasAlpha = this._a < 1 && this._a >= 0;
var needsAlphaFormat = !formatSet && hasAlpha && (format === "hex" || format === "hex6" || format === "hex3" || format === "hex4" || format === "hex8" || format === "name");
if (needsAlphaFormat) {
// Special case for "transparent", all other non-alpha formats
// will return rgba when there is transparency.
if (format === "name" && this._a === 0) {
return this.toName();
}
return this.toRgbString();
}
if (format === "rgb") {
formattedString = this.toRgbString();
}
if (format === "prgb") {
formattedString = this.toPercentageRgbString();
}
if (format === "hex" || format === "hex6") {
formattedString = this.toHexString();
}
if (format === "hex3") {
formattedString = this.toHexString(true);
}
if (format === "hex4") {
formattedString = this.toHex8String(true);
}
if (format === "hex8") {
formattedString = this.toHex8String();
}
if (format === "name") {
formattedString = this.toName();
}
if (format === "hsl") {
formattedString = this.toHslString();
}
if (format === "hsv") {
formattedString = this.toHsvString();
}
if (format === "hwb") {
formattedString = this.toHwbString();
}
if (format === "ncol") {
formattedString = this.toNcolString();
}
if (format === "ncs") {
formattedString = this.toNcsString();
}
if (format === "cmyk") {
formattedString = this.toCmykString();
}
if (format === "cmy") {
formattedString = this.toCmyString();
}
if (format === "xyz") {
formattedString = this.toXyzString();
}
if (format === "lab") {
formattedString = this.toLabString();
}
return formattedString || this.toHexString();
},
clone: function() {
return tinycolor(this.toString());
},
_applyModification: function(fn, args) {
var color = fn.apply(null, [this].concat([].slice.call(args)));
this._r = color._r;
this._g = color._g;
this._b = color._b;
this.setAlpha(color._a);
return this;
},
lighten: function() {
return this._applyModification(lighten, arguments);
},
brighten: function() {
return this._applyModification(brighten, arguments);
},
darken: function() {
return this._applyModification(darken, arguments);
},
desaturate: function() {
return this._applyModification(desaturate, arguments);
},
saturate: function() {
return this._applyModification(saturate, arguments);
},
greyscale: function() {
return this._applyModification(greyscale, arguments);
},
spin: function() {
return this._applyModification(spin, arguments);
},
_applyCombination: function(fn, args) {
return fn.apply(null, [this].concat([].slice.call(args)));
},
analogous: function() {
return this._applyCombination(analogous, arguments);
},
complement: function() {
return this._applyCombination(complement, arguments);
},
monochromatic: function() {
return this._applyCombination(monochromatic, arguments);
},
splitcomplement: function() {
return this._applyCombination(splitcomplement, arguments);
},
triad: function() {
return this._applyCombination(triad, arguments);
},
tetrad: function() {
return this._applyCombination(tetrad, arguments);
},
tetradRect: function() {
return this._applyCombination(tetradRect, arguments);
},
pentad: function() {
return this._applyCombination(pentad, arguments);
},
hexad: function() {
return this._applyCombination(hexad, arguments);
},
distance: function(color, relative) {
var rgb;
if (typeof color === "object" && color.hasOwnProperty("_r") && color.hasOwnProperty("_g") && color.hasOwnProperty("_b")) {
rgb = color.toRgb();
} else if (typeof color === "object" && color.hasOwnProperty("r") && color.hasOwnProperty("g") && color.hasOwnProperty("b")) {
rgb = color;
} else {
rgb = tinycolor(color).toRgb();
}
return colorDistance(this.toRgb(), rgb, relative);
},
isCloseTo: function (color) {
var rgb;
if (typeof color === "object" && color.hasOwnProperty("_r") && color.hasOwnProperty("_g") && color.hasOwnProperty("_b")) {
rgb = color.toRgb();
} else if (typeof color === "object" && color.hasOwnProperty("r") && color.hasOwnProperty("g") && color.hasOwnProperty("b")) {
rgb = color;
} else {
rgb = tinycolor(color).toRgb();
}
return colorSimilarity(this.toRgb(), rgb);
}
};
// If input is an object, force 1 into "1.0" to handle ratios properly
// String input requires "1.0" as input, so 1 will be treated as 1
tinycolor.fromRatio = function(color, opts) {
if (typeof color == "object") {
var newColor = {};
for (var i in color) {
if (color.hasOwnProperty(i)) {
if (i === "a") {
newColor[i] = color[i];
}
else {
newColor[i] = convertToPercentage(color[i]);
}
}
}
color = newColor;
}
return tinycolor(color, opts);
};
// Given a string or object, convert that input to RGB
// Possible string inputs:
//
// "red"
// "#f00" or "f00"
// "#ff0000" or "ff0000"
// "#ff000000" or "ff000000"
// "rgb 255 0 0" or "rgb (255, 0, 0)"
// "rgb 1.0 0 0" or "rgb (1, 0, 0)"
// "rgba (255, 0, 0, 1)" or "rgba 255, 0, 0, 1"
// "rgba (1.0, 0, 0, 1)" or "rgba 1.0, 0, 0, 1"
// "hsl(0, 100%, 50%)" or "hsl 0 100% 50%"
// "hsla(0, 100%, 50%, 1)" or "hsla 0 100% 50%, 1"
// "hsv(0, 100%, 100%)" or "hsv 0 100% 100%"
//
function inputToRGB(color) {
var rgb = { r: 0, g: 0, b: 0 };
var a = 1;
var s = null;
var v = null;
var l = null;
var ok = false;
var format = false;
if (typeof color == "string") {
color = stringInputToObject(color);
}
if (typeof color == "object") {
if (isValidCSSUnit(color.r) && isValidCSSUnit(color.g) && isValidCSSUnit(color.b)) {
rgb = rgbToRgb(color.r, color.g, color.b);
ok = true;
format = String(color.r).substr(-1) === "%" ? "prgb" : "rgb";
}
else if (isValidCSSUnit(color.h) && isValidCSSUnit(color.s) && isValidCSSUnit(color.v)) {
s = convertToPercentage(color.s);
v = convertToPercentage(color.v);
rgb = hsvToRgb(color.h, s, v);
ok = true;
format = "hsv";
}
else if (isValidCSSUnit(color.h) && isValidCSSUnit(color.s) && isValidCSSUnit(color.l)) {
s = convertToPercentage(color.s);
l = convertToPercentage(color.l);
rgb = hslToRgb(color.h, s, l);
ok = true;
format = "hsl";
}
else if (isValidCSSUnit(color.c) && isValidCSSUnit(color.m) && isValidCSSUnit(color.y) && isValidCSSUnit(color.k)) {
c = convertToPercentage(color.c);
m = convertToPercentage(color.m);
y = convertToPercentage(color.y);
k = convertToPercentage(color.k);
rgb = cmykToRgb(c, m, y, k);
ok = true;
format = "cmyk";
}
else if (isValidCSSUnit(color.c) && isValidCSSUnit(color.m) && isValidCSSUnit(color.y)) {
c = convertToPercentage(color.c);
m = convertToPercentage(color.m);
y = convertToPercentage(color.y);
rgb = cmyToRgb(c, m, y);
ok = true;
format = "cmy";
}
else if (isValidCSSUnit(color.h) && isValidCSSUnit(color.w) && isValidCSSUnit(color.b))
{
w = convertToPercentage(color.w);
b = convertToPercentage(color.b);
rgb = hwbToRgb(color.h, w, b);
ok = true;
format = "hwb";
}
else if (isValidNcolHue(color.n) && isValidCSSUnit(color.w) && isValidCSSUnit(color.b)) {
w = convertToPercentage(color.w);
b = convertToPercentage(color.b);
rgb = ncolToRgb(color.n, w, b);
ok = true;
format = "ncol";
}
else if (isValidNcsHue(color.n) && isValidCSSUnit(color.s) && isValidCSSUnit(color.c)) {
rgb = ncsToRgb(color.s, color.c, color.n);
ok = true;
format = "ncs";
}
else if (isValidCSSUnit(color.x) && isValidCSSUnit(color.y) && isValidCSSUnit(color.z)) {
x = convertToPercentage(color.x);
y = convertToPercentage(color.y);
z = convertToPercentage(color.z);
rgb = xyzToRgb(x, y, z);
ok = true;
format = "xyz";
}
else if (isValidCSSUnit(color.l) && isValidCSSUnit(color.A) && isValidCSSUnit(color.b)) {
rgb = labToRgb(color.l, color.A, color.b);
ok = true;
format = "lab";
}
if (color.hasOwnProperty("a")) {
a = color.a;
}
}
a = boundAlpha(a);
return {
ok: ok,
format: color.format || format,
r: mathMin(255, mathMax(rgb.r, 0)),
g: mathMin(255, mathMax(rgb.g, 0)),
b: mathMin(255, mathMax(rgb.b, 0)),
a: a
};
}
// Conversion Functions
// --------------------
// `rgbToHsl`, `rgbToHsv`, `hslToRgb`, `hsvToRgb` modified from:
// <http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript>
// `rgbToRgb`
// Handle bounds / percentage checking to conform to CSS color spec
// <http://www.w3.org/TR/css3-color/>
// *Assumes:* r, g, b in [0, 255] or [0, 1]
// *Returns:* { r, g, b } in [0, 255]
function rgbToRgb(r, g, b){
return {
r: bound01(r, 255) * 255,
g: bound01(g, 255) * 255,
b: bound01(b, 255) * 255
};
}
// `rgbToHsl`
// Converts an RGB color value to HSL.
// *Assumes:* r, g, and b are contained in [0, 255] or [0, 1]
// *Returns:* { h, s, l } in [0,1]
function rgbToHsl(r, g, b) {
r = bound01(r, 255);
g = bound01(g, 255);
b = bound01(b, 255);
var max = mathMax(r, g, b), min = mathMin(r, g, b);
var h, s, l = (max + min) / 2;
if(max == min) {
h = s = 0; // achromatic
}
else {
var d = max - min;
s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
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, s: s, l: l };
}
// `hslToRgb`
// Converts an HSL color value to RGB.
// *Assumes:* h is contained in [0, 1] or [0, 360] and s and l are contained [0, 1] or [0, 100]
// *Returns:* { r, g, b } in the set [0, 255]
function hslToRgb(h, s, l) {
var r, g, b;
h = bound01(h, 360);
s = bound01(s, 100);
l = bound01(l, 100);
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;
}
if(s === 0) {
r = g = b = l; // achromatic
}
else {
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 };
}
// `rgbToHsv`
// Converts an RGB color value to HSV
// *Assumes:* r, g, and b are contained in the set [0, 255] or [0, 1]
// *Returns:* { h, s, v } in [0,1]
function rgbToHsv(r, g, b) {
r = bound01(r, 255);
g = bound01(g, 255);
b = bound01(b, 255);
var max = mathMax(r, g, b), min = mathMin(r, g, b);
var h, s, v = max;
var d = max - min;
s = max === 0 ? 0 : d / max;
if(max == min) {
h = 0; // achromatic
}
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, s: s, v: v };
}
// `hsvToRgb`
// Converts an HSV color value to RGB.
// *Assumes:* h is contained in [0, 1] or [0, 360] and s and v are contained in [0, 1] or [0, 100]
// *Returns:* { r, g, b } in the set [0, 255]
function hsvToRgb(h, s, v) {
h = bound01(h, 360) * 6;
s = bound01(s, 100);
v = bound01(v, 100);
var i = Math.floor(h),
f = h - i,
p = v * (1 - s),
q = v * (1 - f * s),
t = v * (1 - (1 - f) * s),
mod = i % 6,
r = [v, q, p, p, t, v][mod],
g = [t, v, v, q, p, p][mod],
b = [p, p, t, v, v, q][mod];
return { r: r * 255, g: g * 255, b: b * 255 };
}
// `rgbToHex`
// Converts an RGB color to hex
// Assumes r, g, and b are contained in the set [0, 255]
// Returns a 3 or 6 character hex
function rgbToHex(r, g, b, allow3Char) {
var hex = [
pad2(mathRound(r).toString(16)),
pad2(mathRound(g).toString(16)),
pad2(mathRound(b).toString(16))
];
// Return a 3 character hex if possible
if (allow3Char && hex[0].charAt(0) == hex[0].charAt(1) && hex[1].charAt(0) == hex[1].charAt(1) && hex[2].charAt(0) == hex[2].charAt(1)) {
return hex[0].charAt(0) + hex[1].charAt(0) + hex[2].charAt(0);
}
return hex.join("");
}
// `rgbaToHex`
// Converts an RGBA color plus alpha transparency to hex
// Assumes r, g, b are contained in the set [0, 255] and
// a in [0, 1]. Returns a 4 or 8 character rgba hex
function rgbaToHex(r, g, b, a, allow4Char) {
var hex = [
pad2(mathRound(r).toString(16)),
pad2(mathRound(g).toString(16)),
pad2(mathRound(b).toString(16)),
pad2(convertDecimalToHex(a))
];
// Return a 4 character hex if possible
if (allow4Char && hex[0].charAt(0) == hex[0].charAt(1) && hex[1].charAt(0) == hex[1].charAt(1) && hex[2].charAt(0) == hex[2].charAt(1) && hex[3].charAt(0) == hex[3].charAt(1)) {
return hex[0].charAt(0) + hex[1].charAt(0) + hex[2].charAt(0) + hex[3].charAt(0);
}
return hex.join("");
}
// `rgbaToArgbHex`
// Converts an RGBA color to an ARGB Hex8 string
// Rarely used, but required for "toFilter()"
function rgbaToArgbHex(r, g, b, a) {
var hex = [
pad2(convertDecimalToHex(a)),
pad2(mathRound(r).toString(16)),
pad2(mathRound(g).toString(16)),
pad2(mathRound(b).toString(16))
];
return hex.join("");
}
// `rgbToCmy`
// Convert an RGB color to CMY
// *Assumes* r, g, and b are contained in the set [0, 255]
// *Returns:* { c, m, y, k } in [0, 1]
function rgbToCmy(r, g, b) {
r = bound01(r, 255);
g = bound01(g, 255);
b = bound01(b, 255);
return { c: 1 - r, m: 1 - g, y: 1 - b };
}
// `cmyToRgb`
// Convert an CMY color to RGB
// *Assumes:* c, m, y are contained in the set [0, 1] or [0, 100]
// *Returns:* { r, g, b } in the set [0, 255]
function cmyToRgb(c, m, y) {
c = bound01(c, 100);
m = bound01(m, 100);
y = bound01(y, 100);
return { r: (1 - c) * 255, g: (1 - m) * 255, b: (1 - y) * 255 };
}
// `rgbToCmyk`
// Convert an RGB color to CMYK
// *Assumes* r, g, and b are contained in the set [0, 255]
// *Returns:* { c, m, y, k } in [0, 1]
function rgbToCmyk(r, g, b) {
r = bound01(r, 255);
g = bound01(g, 255);
b = bound01(b, 255);
var max = mathMax(r, g, b);
var c, m, y, k = 1 - max;
if(k == 1) {
c = 0;
m = 0;
y = 0;
}
else {
c = (1 - r - k) / (1 - k);
m = (1 - g - k) / (1 - k);
y = (1 - b - k) / (1 - k);
}
return { c: c, m: m, y: y, k: k };
}
// `cmykToRgb`
// Convert an CMYK color to RGB
// *Assumes:* c, m, y, k are contained in the set [0, 1] or [0, 100]
// *Returns:* { r, g, b } in the set [0, 255]
function cmykToRgb(c, m, y, k) {
c = bound01(c, 100);
m = bound01(m, 100);
y = bound01(y, 100);
k = bound01(k, 100);
return { r: (1 - c) * (1 - k) * 255, g: (1 - m) * (1 - k) * 255, b: (1 - y) * (1 - k) * 255 };
}
// `rgbToHwb`
// Convert an RGB color to HWB
// *Assumes* r, g, and b are contained in the set [0, 255]
// *Returns:* { h, w, b } in [0, 1]
function rgbToHwb(r, g, b) {
r = bound01(r, 255);
g = bound01(g, 255);
b = bound01(b, 255);
var max = mathMax(r, g, b), min = mathMin(r, g, b);
var h, w = min, B = 1 - max;
if(max == min) {
h = 0; // achromatic
}
else {
var d = max - min;
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, w: w, b: B };
}
// `hwbToRgb`
// Converts an HWB color value to RGB.
// *Assumes:* h is contained in [0, 1] or [0, 360] and w and b are contained in [0, 1] or [0, 100]
// *Returns:* { r, g, b } in the set [0, 255]
function hwbToRgb(h, w, B) {
w = bound01(w, 100);
B = bound01(B, 100);
var v = 1 - B,
s = v === 0 ? 0 : (1 - w / v);
return hsvToRgb(h, convertToPercentage(s), convertToPercentage(v));
}
// `rgbToXyz`
// Convert an RGB color to XYZ
// *Assumes* r, g, and b are contained in the set [0, 255]
// *Returns:* { x, y, z } in [0, 1]
function rgbToXyz(r, g, b) {
var x, y, z,
M = matrix.rgbxyz,
handleRgb = function (v) {
v = bound01(v, 255);
return (v > 0.04045) ? Math.pow((v + 0.055) / 1.055, 2.4) : v / 12.92;
};
r = handleRgb(r);
g = handleRgb(g);
b = handleRgb(b);
x = (r * M.x[0] + g * M.x[1] + b * M.x[2]);
y = (r * M.y[0] + g * M.y[1] + b * M.y[2]);
z = (r * M.z[0] + g * M.z[1] + b * M.z[2]);
return { x: x, y: y, z: z };
}
// `xyzToRgb`
// Converts an XYZ color value to RGB.
// *Assumes:* x, y and z are contained in [0, 1] or [0, 100]
// *Returns:* { r, g, b } in the set [0, 255]
function xyzToRgb(x, y, z) {
x = bound01(x, 100);
y = bound01(y, 100);
z = bound01(z, 100);
var M = matrix.rgbxyz,
r = x * M.r[0] + y * M.r[1] + z * M.r[2],
g = x * M.g[0] + y * M.g[1] + z * M.g[2],
b = x * M.b[0] + y * M.b[1] + z * M.b[2],
handleRgb = function (v) {
v = v > 0.0031308 ? 1.055 * Math.pow(v, 1 / 2.4) - 0.055 : 12.92 * v;
return v > 1 ? 1 : v < 0 ? 0 : v;
};
return {
r: handleRgb(r) * 255,
g: handleRgb(g) * 255,
b: handleRgb(b) * 255
};
}
// `rgbToLab`
// Convert an RGB color to LAB
// *Assumes* r, g, and b are contained in the set [0, 255]
// *Returns:* { l } in [0, 100] and { a, b } in [-110, 110]
function rgbToLab(r, g, b) {
var M = matrix.rgbxyz,
handleXyz = function (v, arr) {
v = v / arr.reduce(function (p, c) { return p + c; }, 0);
return (v > 0.008856) ? Math.pow(v, 1 / 3) : v * 7.787037 + 16 / 116;
},
xyz = rgbToXyz(r, g, b),
x = handleXyz(xyz.x, M.x),
y = handleXyz(xyz.y, M.y),
z = handleXyz(xyz.z, M.z);
return { l: y * 116 - 16, a: 500 * (x - y), b: 200 * (y - z) };
}
// `labToRgb`
// Converts an LAB color value to RGB.
// *Assumes:* l is contained in [0, 100], a and b are contained in [-110, 110]
// *Returns:* { r, g, b } in the set [0, 255]
function labToRgb(l, a, b) {
l = parseFloat(l);
a = parseFloat(a);
b = parseFloat(b);
var M = matrix.rgbxyz,
y = (l + 16) / 116,
x = a / 500 + y,
z = y - b / 200,
handleXyz = function (v, arr) {
return (Math.pow(v, 3) > 0.008856 ? Math.pow(v, 3) : (v - 16 / 116) / 7.787037) * arr.reduce(function (p, c) { return p + c; }, 0);
};
return xyzToRgb(handleXyz(x, M.x) * 100, handleXyz(y, M.y) * 100, handleXyz(z, M.z) * 100);
}
// `rgbToNcol`
// Convert an RGB color to NCol (initiative from W3Schools)
// *Assumes* r, g, and b are contained in the set [0, 255]
// *Returns:* { n } in [RYGCBM][0, 99] { w, b } in [0, 1]
function rgbToNcol(r, g, b) {
var hwb = rgbToHwb(r, g, b),
ncol = ["r", "y", "g", "c", "b", "m"];
var h = mathRound(hwb.h * 600),
w = hwb.w,
B = hwb.b,
R = h % 100,
n = ncol[(h - R) / 100] + R;
return { n: n.toUpperCase(), w: w, b: B };
}
// `ncolToRgb`
// Converts an NCol color value to RGB.
// *Assumes:* n is contained in [RYGCBM][0, 99] and w and b are contained in [0, 1] or [0, 100]
// *Returns:* { r, g, b } in the set [0, 255]
function ncolToRgb(n, w, B) {
n = n.toLowerCase();
var h = ((["r", "y", "g", "c", "b", "m"].indexOf(n[0]) * 100 + parseFloat(n.slice(1))) * 0.6) % 360;
return hwbToRgb(h, w, B);
}
// Natural Color System.
// Thanks to w3color.js for some of the basics here.
// <https://www.w3schools.com/lib/w3color.js>
// *CAUTION:* NCS has no offical conversion formula at this moment.
// Values returned are NOT accurate and may not even exist in the system.
// Functions below only try to find the nearest and possible value.
// Check the official website to learn more about NCS.
// <https://ncscolour.com/>
// `ncsToString`
// Format NCS string.
// *Assumes:* s and c are contained in [0, 100] and n is contained in [RYGBN]([0, 99][RYGB])
// *Returns:* NCS standard value
function ncsToString(s, c, n) {
s = bound01(convertToPercentage(s), 100);
c = bound01(convertToPercentage(c), 100);
return "S " + ("00" + mathRound(s * 100)).slice(-2) + ("00" + mathRound(c * 100)).slice(-2) + "-" + n.toUpperCase();
}
// `ncsToRgb`
// *CAUTION:* The function below might not return expected value. For detail, please check [here](#section-36).
// Converts an NCS color value to RGB.
// *Assumes:* s and c are contained in [0, 1] or [0, 100] and n is contained in [RYGBN]([0, 99][RYGB])
// *Returns:* { r, g, b } in the set [0, 255]
function ncsToRgb(s, c, n) {
if (tinycolor.hasOwnProperty("library")) {
var code = ncsToString(s, c, n);
if (code in tinycolor.library.ncs) {
return tinycolor(tinycolor.library.ncs[code]).toRgb();
}
}
n = n.toLowerCase();
s = bound01(s, 100);
c = bound01(c, 100);
function processValue(value, factor, black) {
var final = value * factor * (1 - black);
return final > 1 ? 1 : final < 0 ? 0 : final;
}
var match = matchers.NCS_HUE_MATCH.exec(n).filter(function (v) { return typeof v !== "undefined"; }),
n1 = match[1], p = 0,
r = 0,
g = 0,
b = 0,