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culori - npm Package Compare versions

Comparing version 0.3.73 to 0.4.0

1337

build/culori.js

@@ -11,3 +11,3 @@ (function (global, factory) {

var defineMode = function defineMode(definition) {
var defineMode = function (definition) {
converters[definition.mode] = Object.assign(converters[definition.mode] || {}, definition.output);

@@ -21,17 +21,11 @@ Object.keys(definition.input || {}).forEach(function (k) {

modes[definition.mode] = definition;
(definition.parsers || []).forEach(function (parser) {
return parsers.push(parser);
});
(definition.parsers || []).forEach(function (parser) { return parsers.push(parser); });
};
var getModeDefinition = function getModeDefinition(mode) {
return modes[mode];
};
var getModeDefinition = function (mode) { return modes[mode]; };
var parse = function parse(color) {
var result = void 0,
i = 0,
len = parsers.length;
var parse = function (color) {
var result, i = 0, len = parsers.length;
while (i < len) {
if ((result = parsers[i++](color)) !== undefined) break;
if ((result = parsers[i++](color)) !== undefined) { break; }
}

@@ -41,47 +35,31 @@ return result;

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) {
return typeof obj;
} : function (obj) {
return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
};
var prepare = function (color, mode) { return color === undefined ?
undefined
: typeof color !== 'object' ?
parse(color)
: color.mode === undefined ?
Object.assign({}, color, {mode: mode})
: color; };
var _extends = Object.assign || function (target) {
for (var i = 1; i < arguments.length; i++) {
var source = arguments[i];
var converter = function (target_mode) {
if ( target_mode === void 0 ) target_mode = 'rgb';
for (var key in source) {
if (Object.prototype.hasOwnProperty.call(source, key)) {
target[key] = source[key];
}
}
}
return target;
};
var prepare = function prepare(color, mode) {
return color === undefined ? undefined : (typeof color === 'undefined' ? 'undefined' : _typeof(color)) !== 'object' ? parse(color) : color.mode === undefined ? _extends({}, color, { mode: mode }) : color;
};
var converter = function converter() {
var target_mode = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 'rgb';
return function (color) {
return (color = prepare(color, target_mode)) !== undefined ?
return function (color) { return (color = prepare(color, target_mode)) !== undefined ?
// if the color's mode corresponds to our target mode
color.mode === target_mode ?
// then just return the color
color
// otherwise check to see if we have a dedicated
// converter for the target mode
: converters[color.mode][target_mode] ?
// and return its result...
converters[color.mode][target_mode](color)
// ...otherwise pass through RGB as an intermediary step.
// if the target mode is RGB...
: target_mode === 'rgb' ?
// just return the RGB
converters[color.mode].rgb(color)
// otherwise convert color.mode -> RGB -> target_mode
: converters.rgb[target_mode](converters[color.mode].rgb(color)) : undefined;
};
color.mode === target_mode ?
// then just return the color
color
// otherwise check to see if we have a dedicated
// converter for the target mode
: converters[color.mode][target_mode] ?
// and return its result...
converters[color.mode][target_mode](color)
// ...otherwise pass through RGB as an intermediary step.
// if the target mode is RGB...
: target_mode === 'rgb' ?
// just return the RGB
converters[color.mode].rgb(color)
// otherwise convert color.mode -> RGB -> target_mode
: converters.rgb[target_mode](converters[color.mode].rgb(color))
: undefined; };
};

@@ -91,24 +69,20 @@

var r = function r(value, precision) {
return Math.round(value * (precision = Math.pow(10, precision))) / precision;
};
var r = function (value, precision) { return Math.round(value * (precision = Math.pow(10, precision))) / precision; };
var round = (function () {
var precision = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 4;
return function (value) {
return typeof value === 'number' ? r(value, precision) : value;
};
});
function round (precision) {
if ( precision === void 0 ) precision = 4;
var clamp = (function (value) {
return Math.round(Math.max(0, Math.min(value, 1)) * 255);
});
return function (value) { return typeof value === 'number' ? r(value, precision) : value; };
}
var rgb = converter('rgb'),
roundAlpha = round(2);
function fixup (value) { return Math.round(Math.max(0, Math.min(value, 1)) * 255); }
var formatter = (function () {
var format = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 'rgb';
return function (c) {
var rgb = converter('rgb');
var roundAlpha = round(2);
function formatter (format) {
if ( format === void 0 ) format = 'rgb';
return function (c) {
var color = rgb(c);

@@ -120,5 +94,5 @@

var r = clamp(color.r);
var b = clamp(color.b);
var g = clamp(color.g);
var r = fixup(color.r);
var g = fixup(color.g);
var b = fixup(color.b);

@@ -132,15 +106,15 @@ if (format === 'hex') {

// opaque color
return 'rgb(' + r + ', ' + g + ', ' + b + ')';
return ("rgb(" + r + ", " + g + ", " + b + ")");
} else {
// transparent color
return 'rgba(' + r + ', ' + g + ', ' + b + ', ' + roundAlpha(c.alpha) + ')';
return ("rgba(" + r + ", " + g + ", " + b + ", " + (roundAlpha(c.alpha)) + ")");
}
}
};
});
}
var zip = (function (colors) {
var mode = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'rgb';
function zip (colors, mode) {
if ( mode === void 0 ) mode = 'rgb';
var channels = getModeDefinition(mode).channels;

@@ -150,18 +124,12 @@ var res = {

};
var _loop = function _loop(i) {
res[channels[i]] = colors.map(function (c) {
return c[channels[i]];
});
var loop = function ( i ) {
res[channels[i]] = colors.map(function (c) { return c[channels[i]]; });
};
for (var i = 0; i < channels.length; i++) {
_loop(i);
}
for (var i = 0; i < channels.length; i++) loop( i );
return res;
});
}
var interpolate = (function (colors) {
var mode = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'rgb';
var interpolations = arguments[2];
function interpolate (colors, mode, interpolations) {
if ( mode === void 0 ) mode = 'rgb';

@@ -174,4 +142,3 @@ var zipped = zip(colors.map(converter(mode)), mode);

t = Math.min(Math.max(0, t), 1);
var res = { mode: mode },
val = void 0;
var res = { mode: mode }, val;
for (var i = 0; i < keys.length; i++) {

@@ -183,4 +150,4 @@ if ((val = interpolations[keys[i]](zipped[keys[i]], t)) !== undefined) {

return res;
};
});
}
}

@@ -199,9 +166,8 @@ /*

var interpolateNumber = (function () {
return function (values) {
function interpolateNumber () { return function (values) {
if (values.length === 2) {
// Linear Number interpolation
// ---------------------------
// If both values are undefined, return undefined

@@ -223,5 +189,10 @@ if (values[0] === undefined && values[1] === undefined) {

// ---------------------------
// If all values are undefined, return undefined
if (values[0] === undefined && values[1] === undefined && values[2] === undefined && values[3] === undefined) {
if (
values[0] === undefined &&
values[1] === undefined &&
values[2] === undefined &&
values[3] === undefined
) {
return undefined;

@@ -245,4 +216,3 @@ }

}
};
});
}; }

@@ -261,9 +231,9 @@ /*

var interpolateAlpha = (function () {
return function (values, t) {
function interpolateAlpha () { return function (values, t) {
if (values.length === 2) {
// Linear Alpha interpolation
// --------------------------
// If both alphas are undefined,

@@ -273,7 +243,12 @@ // or if t is next to the undefined alpha,

// about undefined alpha being 1.
if (values[0] === undefined && values[1] === undefined || values[0] === undefined && t === 0 || values[1] === undefined && t === 1) return undefined;
if (
(values[0] === undefined && values[1] === undefined) ||
(values[0] === undefined && t === 0) ||
(values[1] === undefined && t === 1)
) { return undefined; }
// If at least one alpha is defined,
// assume alpha = 1 for any undefined values.
return [values[0] === undefined ? 1 : values[0], values[1] === undefined ? 1 : values[1]];
return [ values[0] === undefined ? 1 : values[0], values[1] === undefined ? 1 : values[1]];
} else {

@@ -285,3 +260,8 @@

// If all values are undefined, return undefined
if (values[0] === undefined && values[1] === undefined && values[2] === undefined && values[3] === undefined) {
if (
values[0] === undefined &&
values[1] === undefined &&
values[2] === undefined &&
values[3] === undefined
) {
return undefined;

@@ -292,12 +272,7 @@ }

// put alpha = 1 for any undefined values
return values.map(function (v) {
return v === undefined ? 1 : v;
});
return values.map(function (v) { return v === undefined ? 1 : v; });
}
};
});
}; }
var normalizeHue = (function (hue) {
return (hue = hue % 360) < 0 ? hue + 360 : hue;
});
function normalizeHue (hue) { return (hue = hue % 360) < 0 ? hue + 360 : hue; }

@@ -318,6 +293,7 @@ /*

var interpolateHue = (function () {
var shortPath = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : true;
return function (values) {
function interpolateHue (shortPath) {
if ( shortPath === void 0 ) shortPath = true;
return function (values) {
if (values.length === 2) {

@@ -332,3 +308,3 @@

}
// if both hues are defined, interpolate between

@@ -356,12 +332,15 @@ // the start hue and the end hue brought closest

// ------------------------
// If all values are undefined, return undefined
if (values[0] === undefined && values[1] === undefined && values[2] === undefined && values[3] === undefined) {
if (
values[0] === undefined &&
values[1] === undefined &&
values[2] === undefined &&
values[3] === undefined
) {
return undefined;
}
if (shortPath) {
return values.map(function (v) {
return normalizeHue(v);
});
return values.map(function (v) { return normalizeHue(v); });
}

@@ -371,30 +350,31 @@

return values;
}
};
});
}
// todo hue short vs. hue long
// todo normalize hue before and after interpolateHue
var identity = (function (d) {
return d;
});
function identity (d) { return d; }
var interpolateFunctionLinear = (function () {
var normalize = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : identity;
var γ = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
return function (arr, t) {
function interpolateFunctionLinear (normalize, γ) {
if ( normalize === void 0 ) normalize = identity;
if ( γ === void 0 ) γ = 1;
return function (arr, t) {
t = Math.pow(t, γ);
var cls = t * (arr.length - 1),
idx = Math.floor(cls),
a = arr[idx],
b = arr[idx + 1],
t0 = cls - idx;
var cls = t * (arr.length - 1),
idx = Math.floor(cls),
a = arr[idx],
b = arr[idx + 1],
t0 = cls - idx;
var values = normalize([a, b], t0);
return (typeof values === 'undefined' ? 'undefined' : _typeof(values)) === 'object' ? (a = values[0], b = values[1], a + t0 * (b - a)) : values;
return typeof values === 'object' ?
(a = values[0], b = values[1], a + t0 * (b - a)) :
values;
};
});
}

@@ -427,10 +407,15 @@ /*

var bspline = function bspline(Vim2, Vim1, Vi, Vip1, t) {
var bspline = function (Vim2, Vim1, Vi, Vip1, t) {
var t2 = t * t;
var t3 = t2 * t;
return ((1 - 3 * t + 3 * t2 - t3) * Vim2 + (4 - 6 * t2 + 3 * t3) * Vim1 + (1 + 3 * t + 3 * t2 - 3 * t3) * Vi + t3 * Vip1) / 6;
return (
(1 - 3 * t + 3 * t2 - t3) * Vim2 +
(4 - 6 * t2 + 3 * t3) * Vim1 +
(1 + 3 * t + 3 * t2 - 3 * t3) * Vi +
t3 * Vip1
) / 6;
};
var solve = function solve(v) {
var i;
var solve = function (v) {
var i;
var n = v.length - 1;

@@ -440,29 +425,30 @@ var c = new Array(n);

var sol = new Array(n);
c[1] = 1 / 4, _v[1] = (6 * v[1] - v[0]) / 4;
c[1] = 1/4, _v[1] = (6 * v[1] - v[0])/4;
for (i = 2; i < n; ++i) {
c[i] = 1 / (4 - c[i - 1]);
_v[i] = (6 * v[i] - (i == n - 1 ? v[n] : 0) - _v[i - 1]) * c[i];
c[i] = 1 / (4 - c[i-1]);
_v[i] = (6 * v[i] - (i == n-1 ? v[n] : 0) - _v[i-1]) * c[i];
}
sol[0] = v[0];
sol[n] = v[n];
if (n - 1 > 0) {
sol[n - 1] = _v[n - 1];
sol[n-1] = _v[n-1];
}
for (i = n - 2; i > 0; --i) {
sol[i] = _v[i] - c[i] * sol[i + 1];
for (i = n-2; i > 0; --i) {
sol[i] = _v[i] - c[i] * sol[i+1];
}
return sol;
};
var interpolateFunctionSpline = (function () {
var normalize = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : identity;
var method = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'bspline';
var γ = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;
return function (arr, t) {
function interpolateFunctionSpline (normalize, method, γ) {
if ( normalize === void 0 ) normalize = identity;
if ( method === void 0 ) method = 'bspline';
if ( γ === void 0 ) γ = 1;
return function (arr, t) {
t = Math.pow(t, γ);

@@ -478,12 +464,14 @@

var Vim1 = arr[i];
var Vi = arr[i + 1];
var Vi = arr[i+1];
var Vim2 = i > 0 ? arr[i - 1] : 2 * Vim1 - Vi;
var Vip1 = i < classes - 1 ? arr[i + 2] : 2 * Vi - Vim1;
var Vim2 = i > 0 ? arr[i-1] : 2 * Vim1 - Vi;
var Vip1 = i < classes - 1 ? arr[i+2] : 2 * Vi - Vim1;
var v = normalize([Vim2, Vim1, Vi, Vip1]);
return (typeof v === 'undefined' ? 'undefined' : _typeof(v)) === 'object' ? bspline(v[0], v[1], v[2], v[3], (t - i / classes) * classes) : v;
return typeof v === 'object' ?
bspline(v[0], v[1], v[2], v[3], (t - i / classes) * classes)
: v;
};
});
}

@@ -495,28 +483,29 @@ /*

var interpolateFunctionCosine = (function () {
var normalize = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : identity;
var γ = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
return function (arr, t) {
function interpolateFunctionCosine (normalize, γ) {
if ( normalize === void 0 ) normalize = identity;
if ( γ === void 0 ) γ = 1;
return function (arr, t) {
t = Math.pow(t, γ);
var cls = t * (arr.length - 1),
idx = Math.floor(cls),
a = arr[idx],
b = arr[idx + 1],
t0 = cls - idx;
var cls = t * (arr.length - 1),
idx = Math.floor(cls),
a = arr[idx],
b = arr[idx + 1],
t0 = cls - idx;
var values = normalize([a, b], t0);
if ((typeof values === 'undefined' ? 'undefined' : _typeof(values)) === 'object') {
if (typeof values === 'object') {
a = values[0];
b = values[1];
var c = (1 - Math.cos(t0 * Math.PI)) / 2;
return a * (1 - c) + b * c;
return (a * (1 - c) + b * c);
} else {
return values;
}
}
};
});
}
var monotone = function monotone(v0, v1, v2, v3, h, t) {
var monotone = function (v0, v1, v2, v3, h, t) {

@@ -531,10 +520,16 @@ var h2 = h * h;

return (s20 + s31 - 2 * s21) / h2 * t3 + (3 * s21 - 2 * s20 - s31) / h * t2 + s20 * t + v1;
return (
(s20 + s31 - 2 * s21) / h2 * t3 +
(3 * s21 - 2 * s20 - s31) / h * t2 +
s20 * t +
v1
);
};
var interpolateFunctionMonotone = (function () {
var normalize = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : identity;
var γ = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
return function (arr, t) {
function interpolateFunctionMonotone (normalize, γ) {
if ( normalize === void 0 ) normalize = identity;
if ( γ === void 0 ) γ = 1;
return function (arr, t) {
t = Math.pow(t, γ);

@@ -544,3 +539,3 @@

var i = void 0;
var i;
if (t === 1) {

@@ -560,9 +555,10 @@ i = n - 1;

return (typeof v === 'undefined' ? 'undefined' : _typeof(v)) === 'object' ? monotone(v[0], v[1], v[2], v[3], 1 / n, t - i / n) : v;
return typeof v === 'object' ?
monotone(v[0], v[1], v[2], v[3], 1 / n, t - i / n) : v;
};
});
}
var samples = (function () {
var n = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 2;
var γ = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
function samples (n, γ) {
if ( n === void 0 ) n = 2;
if ( γ === void 0 ) γ = 1;

@@ -577,7 +573,84 @@ if (n < 2) {

return res;
});
}
var differenceEuclidean = function differenceEuclidean() {
var mode = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 'rgb';
var rgb$1 = converter('rgb');
function displayable (color) {
var c = rgb$1(color);
return (
c !== undefined &&
c.r >= 0 && c.r <= 1 &&
c.g >= 0 && c.g <= 1 &&
c.b >= 0 && c.b <= 1
);
}
var lch = converter('lch');
var rgb$2 = converter('rgb');
var prepare$1 = function (color) { return color === undefined ?
undefined
: typeof color !== 'object' ?
parse(color)
: color.mode === undefined ?
undefined
: color; };
var clamp_value = function (v) { return Math.max(0, Math.min(v, 1)); };
var clamp_rgb = function (color) {
var c = rgb$2(color);
c.r = clamp_value(c.r);
c.g = clamp_value(c.g);
c.b = clamp_value(c.b);
return c;
};
function clamp (method) {
if ( method === void 0 ) method = 'rgb';
return function (color) {
color = prepare$1(color);
// if the color is undefined or displayable, return it directly
if (color === undefined || displayable(color)) { return color; }
// keep track of color's original mode
var conv = converter(color.mode);
if (method === 'rgb') {
return conv(clamp_rgb(color));
}
// convert to LCh for clamping
color = lch(color);
// try with chroma = 0
var clamped = Object.assign({}, color, {c: 0});
// if not even chroma = 0 is displayable
// fall back to RGB clamping
if (!displayable(clamped)) {
return conv(clamp_rgb(clamped));
}
// By this time we know chroma = 0 is displayable and our current chroma is not.
// Find the displayable chroma through the bisection method.
var start = 0, end = color.c, delta = 0.01;
while (end - start > delta) {
clamped.c = start + (end - start) * 0.5;
if (displayable(clamped)) {
start = clamped.c;
} else {
end = clamped.c;
}
}
return conv(clamped);
};
}
var differenceEuclidean = function (mode) {
if ( mode === void 0 ) mode = 'rgb';
var channels = getModeDefinition(mode).channels;

@@ -588,22 +661,20 @@ var conv = converter(mode);

var ConvSmp = conv(smp);
return Math.sqrt(channels.reduce(function (delta, k) {
return (
// ignore alpha channel in computing the euclidean distance
delta + (k === 'alpha' ? 0 : Math.pow(ConvStd[k] - ConvSmp[k], 2))
);
}, 0));
};
return Math.sqrt(
channels.reduce(
function (delta, k) { return delta + (k === 'alpha' ? 0 : Math.pow(ConvStd[k] - ConvSmp[k], 2)); },
0
)
);
}
};
var differenceCie76 = function differenceCie76() {
return differenceEuclidean('lab');
};
var differenceCie76 = function () { return differenceEuclidean('lab'); };
var differenceCie94 = function differenceCie94() {
var kL = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 1;
var K1 = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0.045;
var K2 = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0.015;
var differenceCie94 = function (kL, K1, K2) {
if ( kL === void 0 ) kL = 1;
if ( K1 === void 0 ) K1 = 0.045;
if ( K2 === void 0 ) K2 = 0.015;
var lab = converter('lab');
return function (std, smp) {

@@ -629,4 +700,8 @@

return Math.sqrt(dL2 / Math.pow(kL, 2) + dC2 / Math.pow(1 + K1 * cStd, 2) + dH2 / Math.pow(1 + K2 * cStd, 2));
};
return Math.sqrt(
dL2 / Math.pow(kL, 2) +
dC2 / Math.pow(1 + K1 * cStd, 2) +
dH2 / Math.pow(1 + K2 * cStd, 2)
);
}
};

@@ -641,6 +716,6 @@

var differenceCiede2000 = function differenceCiede2000() {
var Kl = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 1;
var Kc = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
var Kh = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;
var differenceCiede2000 = function (Kl, Kc, Kh) {
if ( Kl === void 0 ) Kl = 1;
if ( Kc === void 0 ) Kc = 1;
if ( Kh === void 0 ) Kh = 1;

@@ -663,3 +738,3 @@ var lab = converter('lab');

var cAvg = (cStd + cSmp) / 2;
var G = 0.5 * (1 - Math.sqrt(Math.pow(cAvg, 7) / (Math.pow(cAvg, 7) + Math.pow(25, 7))));

@@ -669,18 +744,18 @@

var apSmp = aSmp * (1 + G);
var cpStd = Math.sqrt(apStd * apStd + bStd * bStd);
var cpSmp = Math.sqrt(apSmp * apSmp + bSmp * bSmp);
var hpStd = Math.abs(apStd) + Math.abs(bStd) === 0 ? 0 : Math.atan2(bStd, apStd);
hpStd += (hpStd < 0) * 2 * Math.PI;
hpStd += (hpStd < 0) * 2 * Math.PI;
var hpSmp = Math.abs(apSmp) + Math.abs(bSmp) === 0 ? 0 : Math.atan2(bSmp, apSmp);
hpSmp += (hpSmp < 0) * 2 * Math.PI;
hpSmp += (hpSmp < 0) * 2 * Math.PI;
var dL = lSmp - lStd;
var dC = cpSmp - cpStd;
var dhp = cpStd * cpSmp === 0 ? 0 : hpSmp - hpStd;
dhp -= (dhp > Math.PI) * 2 * Math.PI;
dhp += (dhp < -Math.PI) * 2 * Math.PI;
dhp -= (dhp > Math.PI) * 2 * Math.PI;
dhp += (dhp < -Math.PI) * 2 * Math.PI;

@@ -692,3 +767,3 @@ var dH = 2 * Math.sqrt(cpStd * cpSmp) * Math.sin(dhp / 2);

var hp = void 0;
var hp;
if (cpStd * cpSmp === 0) {

@@ -703,20 +778,31 @@ hp = hpStd + hpSmp;

var Lpm50 = Math.pow(Lp - 50, 2);
var T = 1 - 0.17 * Math.cos(hp - Math.PI / 6) + 0.24 * Math.cos(2 * hp) + 0.32 * Math.cos(3 * hp + Math.PI / 30) - 0.20 * Math.cos(4 * hp - 63 * Math.PI / 180);
var Sl = 1 + 0.015 * Lpm50 / Math.sqrt(20 + Lpm50);
var T = 1 -
0.17 * Math.cos(hp - Math.PI / 6) +
0.24 * Math.cos(2 * hp) +
0.32 * Math.cos(3 * hp + Math.PI / 30) -
0.20 * Math.cos(4 * hp - 63 * Math.PI / 180);
var Sl = 1 + (0.015 * Lpm50) / Math.sqrt(20 + Lpm50);
var Sc = 1 + 0.045 * Cp;
var Sh = 1 + 0.015 * Cp * T;
var deltaTheta = 30 * Math.PI / 180 * Math.exp(-1 * Math.pow((180 / Math.PI * hp - 275)/25, 2));
var Rc = 2 * Math.sqrt(
Math.pow(Cp, 7) / (Math.pow(Cp, 7) + Math.pow(25, 7))
);
var deltaTheta = 30 * Math.PI / 180 * Math.exp(-1 * Math.pow((180 / Math.PI * hp - 275) / 25, 2));
var Rc = 2 * Math.sqrt(Math.pow(Cp, 7) / (Math.pow(Cp, 7) + Math.pow(25, 7)));
var Rt = -1 * Math.sin(2 * deltaTheta) * Rc;
return Math.sqrt(Math.pow(dL / (Kl * Sl), 2) + Math.pow(dC / (Kc * Sc), 2) + Math.pow(dH / (Kh * Sh), 2) + Rt * dC / (Kc * Sc) * dH / (Kh * Sh));
};
return Math.sqrt(
Math.pow(dL / (Kl * Sl), 2) +
Math.pow(dC / (Kc * Sc), 2) +
Math.pow(dH / (Kh * Sh), 2) +
Rt * dC / (Kc * Sc) * dH / (Kh * Sh)
);
}
};
var differenceCmc = function differenceCmc() {
var l = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 1;
var c = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
var differenceCmc = function (l, c) {
if ( l === void 0 ) l = 1;
if ( c === void 0 ) c = 1;

@@ -734,3 +820,3 @@ var lab = converter('lab');

var hStd = Math.atan2(bStd, aStd);
hStd = hStd + 2 * Math.PI * (hStd < 0);
hStd = hStd + 2 * Math.PI * (hStd < 0);

@@ -747,12 +833,21 @@ var lSmp = LabSmp.l;

var F = Math.sqrt(Math.pow(cStd, 4) / (Math.pow(cStd, 4) + 1900));
var T = hStd >= 164 / 180 * Math.PI && hStd <= 345 / 180 * Math.PI ? 0.56 + Math.abs(0.2 * Math.cos(hStd + 168 / 180 * Math.PI)) : 0.36 + Math.abs(0.4 * Math.cos(hStd + 35 / 180 * Math.PI));
var T = hStd >= (164 / 180 * Math.PI) &&
hStd <= (345 / 180 * Math.PI) ?
0.56 + Math.abs(0.2 * Math.cos(hStd + 168 / 180 * Math.PI))
: 0.36 + Math.abs(0.4 * Math.cos(hStd + 35 / 180 * Math.PI));
var Sl = lStd < 16 ? 0.511 : 0.040975 * lStd / (1 + 0.01765 * lStd);
var Sl = lStd < 16 ? 0.511 : ((0.040975 * lStd) / (1 + 0.01765 * lStd));
var Sc = 0.0638 * cStd / (1 + 0.0131 * cStd) + 0.638;
var Sh = Sc * (F * T + 1 - F);
return Math.sqrt(dL2 / Math.pow(l * Sl, 2), dC2 / Math.pow(c * Sc, 2), dH2 / Math.pow(Sh, 2));
return Math.sqrt(
dL2 / Math.pow(l * Sl, 2),
dC2 / Math.pow(c * Sc, 2),
dH2 / Math.pow(Sh, 2)
);
};
};
var differenceDin99o = function () { return differenceEuclidean('dlab'); };
// selects the vantage point

@@ -770,3 +865,3 @@ // currently does so randomly, but this could be optimized

// const vptree = (colors, metric) => {
// let color = select(colors);

@@ -798,18 +893,14 @@ // let dist = median(color, colors, metric);

//
var identity$1 = function identity(d) {
return d;
};
var identity$1 = function (d) { return d; };
var nearest = (function (colors) {
var metric = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : differenceEuclidean();
var accesor = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : identity$1;
function nearest (colors, metric, accesor) {
if ( metric === void 0 ) metric = differenceEuclidean();
if ( accesor === void 0 ) accesor = identity$1;
var arr = colors.map(function (c, idx) {
return { color: accesor(c), i: idx };
});
return function (color) {
var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
var τ = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : Infinity;
var arr = colors.map(function (c, idx) { return ({ color: accesor(c), i: idx }); });
return function (color, n, τ) {
if ( n === void 0 ) n = 1;
if ( τ === void 0 ) τ = Infinity;
if (isFinite(n)) {

@@ -823,16 +914,10 @@ n = Math.max(1, Math.min(n, arr.length - 1));

return arr.sort(function (a, b) {
return a.d - b.d;
}).slice(0, n).filter(function (c) {
return c.d < τ;
}).map(function (c) {
return c.color;
});
};
});
return arr.sort(function (a, b) { return a.d - b.d; }).slice(0, n).filter(function (c) { return c.d < τ; }).map(function (c) { return c.color; });
}
}
var parseNumber = (function (color, len) {
function parseNumber (color, len) {
if (typeof color !== 'number') { return; }
if (typeof color !== 'number') return;
// hex3: #c93 -> #cc9933

@@ -842,5 +927,5 @@ if (len === 3) {

mode: 'rgb',
r: (color >> 8 & 0xF | color >> 4 & 0xF0) / 255,
g: (color >> 4 & 0xF | color & 0xF0) / 255,
b: (color & 0xF | color << 4 & 0xF0) / 255
r: ((color >> 8 & 0xF) | (color >> 4 & 0xF0)) / 255,
g: ((color >> 4 & 0xF) | (color & 0xF0)) / 255,
b: ((color & 0xF) | (color << 4 & 0xF0)) / 255
};

@@ -853,9 +938,9 @@ }

mode: 'rgb',
r: (color >> 12 & 0xF | color >> 8 & 0xF0) / 255,
g: (color >> 8 & 0xF | color >> 4 & 0xF0) / 255,
b: (color >> 4 & 0xF | color & 0xF0) / 255,
alpha: (color & 0xF | color << 4 & 0xF0) / 255
r: ((color >> 12 & 0xF) | (color >> 8 & 0xF0)) / 255,
g: ((color >> 8 & 0xF) | (color >> 4 & 0xF0)) / 255,
b: ((color >> 4 & 0xF) | (color & 0xF0)) / 255,
alpha: ((color & 0xF) | (color << 4 & 0xF0)) / 255
};
}
// hex6: #f0f1f2

@@ -865,4 +950,4 @@ if (len === 6) {

mode: 'rgb',
r: (color >> 16 & 0xFF) / 255,
g: (color >> 8 & 0xFF) / 255,
r: (color >> 16 & 0xFF) / 255,
g: (color >> 8 & 0xFF) / 255,
b: (color & 0xFF) / 255

@@ -876,9 +961,9 @@ };

mode: 'rgb',
r: (color >> 24 & 0xFF) / 255,
g: (color >> 16 & 0xFF) / 255,
b: (color >> 8 & 0xFF) / 255,
r: (color >> 24 & 0xFF) / 255,
g: (color >> 16 & 0xFF) / 255,
b: (color >> 8 & 0xFF) / 255,
alpha: (color & 0xFF) / 255
};
}
});
}

@@ -1006,3 +1091,3 @@ var named = {

// Added in CSS Colors Level 4: https://drafts.csswg.org/css-color/#changes-from-3
rebeccapurple: 0x663399,
rebeccapurple: 0x663399,
red: 0xff0000,

@@ -1040,5 +1125,5 @@ rosybrown: 0xbc8f8f,

// https://drafts.csswg.org/css-color/#transparent-black
var parseNamed = (function (color) {
return typeof color === 'string' && parseNumber(named[color.toLowerCase()], 6) || undefined;
});
function parseNamed (color) {
return (typeof color === 'string' && parseNumber(named[color.toLowerCase()], 6)) || undefined;
}

@@ -1054,7 +1139,7 @@ /*

var num = (/([+-]?\d*\.?\d+(?:[eE][+-]?\d+)?)/ + '').replace(/^\/|\/$/g, ''); // number
var per = num + '%'; // percentage
var alpha = '(?:' + num + '%|' + num + ')'; // alpha-value
var hue = '(?:' + num + '(deg|grad|rad|turn)|' + num + ')'; // hue
var c = '\\s*,\\s*'; // comma
var s = '\\s+'; // space
var per = num + "%"; // percentage
var alpha = "(?:" + num + "%|" + num + ")"; // alpha-value
var hue = "(?:" + num + "(deg|grad|rad|turn)|" + num + ")"; // hue
var c = "\\s*,\\s*"; // comma
var s = "\\s+"; // space

@@ -1066,6 +1151,6 @@

*/
var rgb_num_old = new RegExp('^rgba?\\(\\s*' + num + c + num + c + num + '\\s*(?:,\\s*' + alpha + '\\s*)?\\)$');
var rgb_per_old = new RegExp('^rgba?\\(\\s*' + per + c + per + c + per + '\\s*(?:,\\s*' + alpha + '\\s*)?\\)$');
var rgb_num_new = new RegExp('^rgba?\\(\\s*' + num + s + num + s + num + '\\s*(?:\\/\\s*' + alpha + '\\s*)?\\)$');
var rgb_per_new = new RegExp('^rgba?\\(\\s*' + per + s + per + s + per + '\\s*(?:\\/\\s*' + alpha + '\\s*)?\\)$');
var rgb_num_old = new RegExp(("^rgba?\\(\\s*" + num + c + num + c + num + "\\s*(?:,\\s*" + alpha + "\\s*)?\\)$"));
var rgb_per_old = new RegExp(("^rgba?\\(\\s*" + per + c + per + c + per + "\\s*(?:,\\s*" + alpha + "\\s*)?\\)$"));
var rgb_num_new = new RegExp(("^rgba?\\(\\s*" + num + s + num + s + num + "\\s*(?:\\/\\s*" + alpha + "\\s*)?\\)$"));
var rgb_per_new = new RegExp(("^rgba?\\(\\s*" + per + s + per + s + per + "\\s*(?:\\/\\s*" + alpha + "\\s*)?\\)$"));

@@ -1076,4 +1161,4 @@ /*

*/
var hsl_old = new RegExp('^hsla?\\(\\s*' + hue + c + per + c + per + '\\s*(?:,\\s*' + alpha + '\\s*)?\\)$');
var hsl_new = new RegExp('^hsla?\\(\\s*' + hue + s + per + s + per + '\\s*(?:\\/\\s*' + alpha + '\\s*)?\\)$');
var hsl_old = new RegExp(("^hsla?\\(\\s*" + hue + c + per + c + per + "\\s*(?:,\\s*" + alpha + "\\s*)?\\)$"));
var hsl_new = new RegExp(("^hsla?\\(\\s*" + hue + s + per + s + per + "\\s*(?:\\/\\s*" + alpha + "\\s*)?\\)$"));

@@ -1089,3 +1174,3 @@ /*

*/
var hwb = new RegExp('^hwb\\(\\s*' + hue + s + per + s + per + '\\s*(?:\\/\\s*' + alpha + '\\s*)?\\)$');
var hwb = new RegExp(("^hwb\\(\\s*" + hue + s + per + s + per + "\\s*(?:\\/\\s*" + alpha + "\\s*)?\\)$"));

@@ -1096,4 +1181,4 @@ /*

*/
var lab = new RegExp('^lab\\(\\s*' + num + s + num + s + num + '\\s*(?:\\/\\s*' + alpha + '\\s*)?\\)$');
var lch = new RegExp('^lch\\(\\s*' + num + s + num + s + hue + '\\s*(?:\\/\\s*' + alpha + '\\s*)?\\)$');
var lab = new RegExp(("^lab\\(\\s*" + num + s + num + s + num + "\\s*(?:\\/\\s*" + alpha + "\\s*)?\\)$"));
var lch$1 = new RegExp(("^lch\\(\\s*" + num + s + num + s + hue + "\\s*(?:\\/\\s*" + alpha + "\\s*)?\\)$"));

@@ -1104,27 +1189,26 @@ /*

*/
var gray = new RegExp('^gray\\(\\s*' + num + '()()\\s*(?:\\/\\s*' + alpha + '\\s*)?\\)$');
var gray = new RegExp(("^gray\\(\\s*" + num + "()()\\s*(?:\\/\\s*" + alpha + "\\s*)?\\)$"));
var parseHex = (function (color) {
function parseHex (color) {
var match;
return (match = color.match(hex)) ? parseNumber(parseInt(match[1], 16), match[1].length) : undefined;
});
}
var parseRgb = (function (color) {
function parseRgb (color) {
var match, res;
var match = void 0,
res = void 0;
if (match = color.match(rgb_num_old) || color.match(rgb_num_new)) {
res = {
res = {
mode: 'rgb',
r: match[1] / 255,
g: match[2] / 255,
b: match[3] / 255
r: match[1] / 255,
g: match[2] / 255,
b: match[3] / 255
};
} else if (match = color.match(rgb_per_old) || color.match(rgb_per_new)) {
res = {
res = {
mode: 'rgb',
r: match[1] / 100,
g: match[2] / 100,
b: match[3] / 100
r: match[1] / 100,
g: match[2] / 100,
b: match[3] / 100
};

@@ -1140,9 +1224,7 @@ } else {

}
return res;
});
}
var parseTransparent = (function (c) {
return c === 'transparent' ? parseNumber(0x00000000, 8) : undefined;
});
function parseTransparent (c) { return c === 'transparent' ? parseNumber(0x00000000, 8) : undefined; }

@@ -1152,3 +1234,3 @@ var rgbDef = {

channels: ['r', 'g', 'b', 'alpha'],
parsers: [parseHex, parseRgb, parseNamed, parseTransparent],
parsers: [ parseHex, parseRgb, parseNamed, parseTransparent ],
interpolate: {

@@ -1162,11 +1244,9 @@ r: interpolateFunctionLinear(interpolateNumber()),

var fn = function fn(c) {
return c < 0.04045 ? c / 12.92 : Math.pow((c + 0.055) / 1.055, 2.4);
};
var fn = function (c) { return c < 0.04045 ? c / 12.92 : Math.pow((c + 0.055) / 1.055, 2.4); };
var convertRgbToLrgb = (function (_ref) {
var r = _ref.r,
g = _ref.g,
b = _ref.b,
alpha = _ref.alpha;
function convertRgbToLrgb (ref) {
var r = ref.r;
var g = ref.g;
var b = ref.b;
var alpha = ref.alpha;

@@ -1179,15 +1259,13 @@ var res = {

};
if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}
var fn$1 = function fn(c) {
return c > 0.0031308 ? 1.055 * Math.pow(c, 1 / 2.4) - 0.055 : 12.92 * c;
};
var fn$1 = function (c) { return c > 0.0031308 ? 1.055 * Math.pow(c, 1/2.4) - 0.055 : 12.92 * c; };
var convertLrgbToRgb = (function (_ref) {
var r = _ref.r,
g = _ref.g,
b = _ref.b,
alpha = _ref.alpha;
function convertLrgbToRgb (ref) {
var r = ref.r;
var g = ref.g;
var b = ref.b;
var alpha = ref.alpha;

@@ -1200,5 +1278,5 @@ var res = {

};
if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}

@@ -1210,3 +1288,3 @@ var lrgbDef = {

},
input: {
input: {
rgb: convertRgbToLrgb

@@ -1225,30 +1303,23 @@ },

function convertHslToRgb (_ref) {
var h = _ref.h,
s = _ref.s,
l = _ref.l,
alpha = _ref.alpha;
function convertHslToRgb(ref) {
var h = ref.h;
var s = ref.s;
var l = ref.l;
var alpha = ref.alpha;
h = normalizeHue(h);
var m1 = l + s * (l < 0.5 ? l : 1 - l);
var m2 = m1 - (m1 - l) * 2 * Math.abs(h / 60 % 2 - 1);
var res = void 0;
switch (Math.floor(h / 60)) {
case 0:
res = { r: m1, g: m2, b: 2 * l - m1 };break;
case 1:
res = { r: m2, g: m1, b: 2 * l - m1 };break;
case 2:
res = { r: 2 * l - m1, g: m1, b: m2 };break;
case 3:
res = { r: 2 * l - m1, g: m2, b: m1 };break;
case 4:
res = { r: m2, g: 2 * l - m1, b: m1 };break;
case 5:
res = { r: m1, g: 2 * l - m1, b: m2 };break;
default:
res = { r: 2 * l - m1, g: 2 * l - m1, b: 2 * l - m1 };
var m2 = m1 - (m1 - l) * 2 * Math.abs(h/60 % 2 - 1);
var res;
switch (Math.floor(h/60)) {
case 0: res = { r: m1, g: m2, b: 2 * l - m1 }; break;
case 1: res = { r: m2, g: m1, b: 2 * l - m1 }; break;
case 2: res = { r: 2 * l - m1, g: m1, b: m2 }; break;
case 3: res = { r: 2 * l - m1, g: m2, b: m1 }; break;
case 4: res = { r: m2, g: 2 * l - m1, b: m1 }; break;
case 5: res = { r: m1, g: 2 * l - m1, b: m2 }; break;
default: res = { r: 2 * l - m1, g: 2 * l - m1, b: 2 * l - m1 };
}
res.mode = 'rgb';
if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;

@@ -1259,10 +1330,9 @@ }

function convertRgbToHsl (_ref) {
var r = _ref.r,
g = _ref.g,
b = _ref.b,
alpha = _ref.alpha;
function convertRgbToHsl(ref) {
var r = ref.r;
var g = ref.g;
var b = ref.b;
var alpha = ref.alpha;
var M = Math.max(r, g, b),
m = Math.min(r, g, b);
var M = Math.max(r, g, b), m = Math.min(r, g, b);
var res = {

@@ -1273,24 +1343,20 @@ mode: 'hsl',

};
if (M - m !== 0) res.h = (M === r ? (g - b) / (M - m) + (g < b) * 6 : M === g ? (b - r) / (M - m) + 2 : (r - g) / (M - m) + 4) * 60;
if (alpha !== undefined) res.alpha = alpha;
if (M - m !== 0) { res.h = (M === r ? (g - b) / (M - m) + (g < b) * 6 : M === g ? (b - r) / (M - m) + 2 : (r - g) / (M - m) + 4) * 60; }
if (alpha !== undefined) { res.alpha = alpha; }
return res;
}
var hue$1 = function hue(val, unit) {
var hue$1 = function (val, unit) {
switch (unit) {
case 'deg':
return +val;
case 'rad':
return val / Math.PI * 180;
case 'grad':
return val / 10 * 9;
case 'turn':
return val * 360;
case 'deg': return +val;
case 'rad': return val / Math.PI * 180;
case 'grad': return val / 10 * 9;
case 'turn': return val * 360;
}
};
var parseHsl = (function (color) {
if (typeof color !== 'string') return;
function parseHsl (color) {
if (typeof color !== 'string') { return; }
var match = color.match(hsl_old) || color.match(hsl_new);
if (!match) return;
if (!match) { return; }
var res = {

@@ -1308,8 +1374,8 @@ mode: 'hsl',

return res;
});
}
var hslDef = {
mode: 'hsl',
output: {
rgb: convertHslToRgb
output: {
rgb: convertHslToRgb
},

@@ -1320,3 +1386,3 @@ input: {

channels: ['h', 's', 'l', 'alpha'],
parsers: [parseHsl],
parsers: [ parseHsl ],
interpolate: {

@@ -1332,29 +1398,22 @@ h: interpolateFunctionLinear(interpolateHue()),

function convertHsvToRgb (_ref) {
var h = _ref.h,
s = _ref.s,
v = _ref.v,
alpha = _ref.alpha;
function convertHsvToRgb(ref) {
var h = ref.h;
var s = ref.s;
var v = ref.v;
var alpha = ref.alpha;
h = normalizeHue(h);
var f = Math.abs(h / 60 % 2 - 1);
var res = void 0;
switch (Math.floor(h / 60)) {
case 0:
res = { r: v, g: v * (1 - s * f), b: v * (1 - s) };break;
case 1:
res = { r: v * (1 - s * f), g: v, b: v * (1 - s) };break;
case 2:
res = { r: v * (1 - s), g: v, b: v * (1 - s * f) };break;
case 3:
res = { r: v * (1 - s), g: v * (1 - s * f), b: v };break;
case 4:
res = { r: v * (1 - s * f), g: v * (1 - s), b: v };break;
case 5:
res = { r: v, g: v * (1 - s), b: v * (1 - s * f) };break;
default:
res = { r: v * (1 - s), g: v * (1 - s), b: v * (1 - s) };
var f = Math.abs(h/60 % 2 - 1);
var res;
switch (Math.floor(h/60)) {
case 0: res = { r: v, g: v * (1 - s * f), b: v * (1 - s) }; break;
case 1: res = { r: v * (1 - s * f), g: v, b: v * (1 - s) }; break;
case 2: res = { r: v * (1 - s), g: v, b: v * (1 - s * f) }; break;
case 3: res = { r: v * (1 - s), g: v * (1 - s * f), b: v }; break;
case 4: res = { r: v * (1 - s * f), g: v * (1 - s), b: v }; break;
case 5: res = { r: v, g: v * (1 - s), b: v * (1 - s * f) }; break;
default: res = { r: v * (1 - s), g: v * (1 - s), b: v * (1 - s) };
}
res.mode = 'rgb';
if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;

@@ -1365,10 +1424,9 @@ }

function convertRgbToHsv (_ref) {
var r = _ref.r,
g = _ref.g,
b = _ref.b,
alpha = _ref.alpha;
function convertRgbToHsv(ref) {
var r = ref.r;
var g = ref.g;
var b = ref.b;
var alpha = ref.alpha;
var M = Math.max(r, g, b),
m = Math.min(r, g, b);
var M = Math.max(r, g, b), m = Math.min(r, g, b);
var res = {

@@ -1379,4 +1437,4 @@ mode: 'hsv',

};
if (M - m !== 0) res.h = (M === r ? (g - b) / (M - m) + (g < b) * 6 : M === g ? (b - r) / (M - m) + 2 : (r - g) / (M - m) + 4) * 60;
if (alpha !== undefined) res.alpha = alpha;
if (M - m !== 0) { res.h = (M === r ? (g - b) / (M - m) + (g < b) * 6 : M === g ? (b - r) / (M - m) + 2 : (r - g) / (M - m) + 4) * 60; }
if (alpha !== undefined) { res.alpha = alpha; }
return res;

@@ -1387,4 +1445,4 @@ }

mode: 'hsv',
output: {
rgb: convertHsvToRgb
output: {
rgb: convertHsvToRgb
},

@@ -1405,51 +1463,51 @@ input: {

function convertHsiToRgb (_ref) {
var h = _ref.h,
s = _ref.s,
i = _ref.i,
alpha = _ref.alpha;
function convertHsiToRgb (ref) {
var h = ref.h;
var s = ref.s;
var i = ref.i;
var alpha = ref.alpha;
h = normalizeHue(h);
var f = Math.abs(h / 60 % 2 - 1);
var res = void 0;
switch (Math.floor(h / 60)) {
case 0:
var f = Math.abs(h/60 % 2 - 1);
var res;
switch (Math.floor(h/60)) {
case 0:
res = {
r: i * (1 + s * (3 / (2 - f) - 1)),
g: i * (1 + s * (3 * (1 - f) / (2 - f) - 1)),
r: i * (1 + s * (3 / (2 - f) - 1)),
g: i * (1 + s * (3 * (1 - f) / (2 - f) - 1)),
b: i * (1 - s)
};
break;
case 1:
case 1:
res = {
r: i * (1 + s * (3 * (1 - f) / (2 - f) - 1)),
g: i * (1 + s * (3 / (2 - f) - 1)),
r: i * (1 + s * (3 * (1 - f) / (2 - f) - 1)),
g: i * (1 + s * (3 / (2 - f) - 1)),
b: i * (1 - s)
};
break;
case 2:
case 2:
res = {
r: i * (1 - s),
g: i * (1 + s * (3 / (2 - f) - 1)),
r: i * (1 - s),
g: i * (1 + s * (3 / (2 - f) - 1)),
b: i * (1 + s * (3 * (1 - f) / (2 - f) - 1))
};
break;
case 3:
case 3:
res = {
r: i * (1 - s),
g: i * (1 + s * (3 * (1 - f) / (2 - f) - 1)),
r: i * (1 - s),
g: i * (1 + s * (3 * (1 - f) / (2 - f) - 1)),
b: i * (1 + s * (3 / (2 - f) - 1))
};
break;
case 4:
case 4:
res = {
r: i * (1 + s * (3 * (1 - f) / (2 - f) - 1)),
g: i * (1 - s),
r: i * (1 + s * (3 * (1 - f) / (2 - f) - 1)),
g: i * (1 - s),
b: i * (1 + s * (3 / (2 - f) - 1))
};
break;
case 5:
case 5:
res = {
r: i * (1 + s * (3 / (2 - f) - 1)),
g: i * (1 - s),
r: i * (1 + s * (3 / (2 - f) - 1)),
g: i * (1 - s),
b: i * (1 + s * (3 * (1 - f) / (2 - f) - 1))

@@ -1463,3 +1521,3 @@ };

res.mode = 'rgb';
if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;

@@ -1470,10 +1528,9 @@ }

function convertRgbToHsi (_ref) {
var r = _ref.r,
g = _ref.g,
b = _ref.b,
alpha = _ref.alpha;
function convertRgbToHsi(ref) {
var r = ref.r;
var g = ref.g;
var b = ref.b;
var alpha = ref.alpha;
var M = Math.max(r, g, b),
m = Math.min(r, g, b);
var M = Math.max(r, g, b), m = Math.min(r, g, b);
var res = {

@@ -1484,4 +1541,4 @@ mode: 'hsi',

};
if (M - m !== 0) res.h = (M === r ? (g - b) / (M - m) + (g < b) * 6 : M === g ? (b - r) / (M - m) + 2 : (r - g) / (M - m) + 4) * 60;
if (alpha !== undefined) res.alpha = alpha;
if (M - m !== 0) { res.h = (M === r ? (g - b) / (M - m) + (g < b) * 6 : M === g ? (b - r) / (M - m) + 2 : (r - g) / (M - m) + 4) * 60; }
if (alpha !== undefined) { res.alpha = alpha; }
return res;

@@ -1492,4 +1549,4 @@ }

mode: 'hsi',
output: {
rgb: convertHsiToRgb
output: {
rgb: convertHsiToRgb
},

@@ -1506,3 +1563,3 @@ input: {

}
};
}

@@ -1519,7 +1576,7 @@ /*

function convertHwbToRgb (_ref) {
var h = _ref.h,
w = _ref.w,
b = _ref.b,
alpha = _ref.alpha;
function convertHwbToRgb (ref) {
var h = ref.h;
var w = ref.w;
var b = ref.b;
var alpha = ref.alpha;

@@ -1529,11 +1586,11 @@ // normalize w + b to 1

var s = w + b;
w /= s;
w /= s;
b /= s;
}
return convertHsvToRgb({
h: h,
s: b === 1 ? 1 : 1 - w / (1 - b),
return convertHsvToRgb({
h: h,
s: b === 1 ? 1 : 1 - w / (1 - b),
v: 1 - b,
alpha: alpha
});
});
}

@@ -1553,3 +1610,3 @@

var hsv = convertRgbToHsv(rgba);
if (hsv === undefined) return undefined;
if (hsv === undefined) { return undefined; }
var res = {

@@ -1560,11 +1617,11 @@ mode: 'hwb',

};
if (hsv.h !== undefined) res.h = hsv.h;
if (hsv.alpha !== undefined) res.alpha = hsv.alpha;
if (hsv.h !== undefined) { res.h = hsv.h; }
if (hsv.alpha !== undefined) { res.alpha = hsv.alpha; }
return res;
}
var parseHwb = (function (color) {
if (typeof color !== 'string') return undefined;
function parseHwb (color) {
if (typeof color !== 'string') { return undefined; }
var match = color.match(hwb);
if (!match) return undefined;
if (!match) { return undefined; }
var res = {

@@ -1576,7 +1633,7 @@ mode: 'hwb',

};
// normalize w + b to at most 1
if (res.w + res.b > 1) {
var s = res.w + res.b;
res.w /= s;
res.w /= s;
res.b /= s;

@@ -1591,8 +1648,8 @@ }

return res;
});
}
var hwbDef = {
mode: 'hwb',
output: {
rgb: convertHwbToRgb
output: {
rgb: convertHwbToRgb
},

@@ -1603,3 +1660,3 @@ input: {

channels: ['h', 'w', 'b', 'alpha'],
parsers: [parseHwb],
parsers: [ parseHwb ],
interpolate: {

@@ -1622,19 +1679,17 @@ h: interpolateFunctionLinear(interpolateHue()),

var Zn = 0.82521;
var k = Math.pow(29, 3) / Math.pow(3, 3);
var e = Math.pow(6, 3) / Math.pow(29, 3);
var fn$2 = function fn(v) {
return Math.pow(v, 3) > e ? Math.pow(v, 3) : (116 * v - 16) / k;
};
var fn$2 = function (v) { return Math.pow(v, 3) > e ? Math.pow(v, 3) : (116 * v - 16) / k; };
var convertLabToXyz = (function (_ref) {
var l = _ref.l,
a = _ref.a,
b = _ref.b;
function convertLabToXyz (ref) {
var l = ref.l;
var a = ref.a;
var b = ref.b;
var fy = (l + 16) / 116;
var fx = a / 500 + fy;
var fz = fy - b / 200;
var fx = a / 500 + fy;
var fz = fy - b / 200;

@@ -1646,3 +1701,3 @@ return {

};
});
}

@@ -1657,19 +1712,20 @@ /*

var convertXyzToRgb = (function (_ref) {
var x = _ref.x,
y = _ref.y,
z = _ref.z;
function convertXyzToRgb (ref) {
var x = ref.x;
var y = ref.y;
var z = ref.z;
return convertLrgbToRgb({
r: x * 3.1338561 - y * 1.6168667 - 0.4906146 * z,
g: x * -0.9787684 + y * 1.9161415 + 0.0334540 * z,
b: x * 0.0719453 - y * 0.2289914 + 1.4052427 * z
});
r: x * 3.1338561 - y * 1.6168667 - 0.4906146 * z,
g: x * -0.9787684 + y * 1.9161415 + 0.0334540 * z,
b: x * 0.0719453 - y * 0.2289914 + 1.4052427 * z
});
}
var convertLabToRgb = (function (lab) {
function convertLabToRgb (lab) {
var res = convertXyzToRgb(convertLabToXyz(lab));
res.mode = 'rgb';
if (lab.alpha !== undefined) res.alpha = lab.alpha;
if (lab.alpha !== undefined) { res.alpha = lab.alpha; }
return res;
});
}

@@ -1685,8 +1741,7 @@ /*

var convertRgbToXyz = (function (rgb) {
var _convertRgbToLrgb = convertRgbToLrgb(rgb),
r = _convertRgbToLrgb.r,
g = _convertRgbToLrgb.g,
b = _convertRgbToLrgb.b;
function convertRgbToXyz (rgb) {
var ref = convertRgbToLrgb(rgb);
var r = ref.r;
var g = ref.g;
var b = ref.b;
return {

@@ -1697,29 +1752,27 @@ x: 0.4360747 * r + 0.3850649 * g + 0.1430804 * b,

};
});
}
var f = function f(value) {
return value > e ? Math.cbrt(value) : (k * value + 16) / 116;
};
var f = function (value) { return value > e ? Math.cbrt(value) : (k * value + 16) / 116; };
var convertXyzToLab = (function (_ref) {
var x = _ref.x,
y = _ref.y,
z = _ref.z;
function convertXyzToLab (ref) {
var x = ref.x;
var y = ref.y;
var z = ref.z;
var f0 = f(x / Xn);
var f1 = f(y / Yn);
var f2 = f(z / Zn);
var f0 = f(x/Xn);
var f1 = f(y/Yn);
var f2 = f(z/Zn);
return {
mode: 'lab',
l: 116 * f1 - 16,
l: (116 * f1) - 16,
a: 500 * (f0 - f1),
b: 200 * (f1 - f2)
};
});
}
var convertRgbToLab = (function (rgb) {
function convertRgbToLab (rgb) {
var res = convertXyzToLab(convertRgbToXyz(rgb));
// Fixes achromatic RGB colors having a _slight_ chroma due to floating-point errors

@@ -1731,11 +1784,10 @@ // and approximated computations in sRGB <-> CIELab.

}
if (rgb.alpha !== undefined) res.alpha = rgb.alpha;
if (rgb.alpha !== undefined) { res.alpha = rgb.alpha; }
return res;
});
}
var parseLab = (function (color) {
if (typeof color !== 'string') return undefined;
function parseLab (color) {
if (typeof color !== 'string') { return undefined; }
var match = void 0,
res = void 0;
var match, res;

@@ -1767,8 +1819,8 @@ if (match = color.match(lab)) {

return res;
});
}
var labDef = {
mode: 'lab',
output: {
rgb: convertLabToRgb
output: {
rgb: convertLabToRgb
},

@@ -1779,3 +1831,3 @@ input: {

channels: ['l', 'a', 'b', 'alpha'],
parsers: [parseLab],
parsers: [ parseLab ],
interpolate: {

@@ -1794,7 +1846,7 @@ l: interpolateFunctionLinear(interpolateNumber()),

*/
var convertLabToLch = (function (_ref) {
var l = _ref.l,
a = _ref.a,
b = _ref.b,
alpha = _ref.alpha;
function convertLabToLch (ref) {
var l = ref.l;
var a = ref.a;
var b = ref.b;
var alpha = ref.alpha;

@@ -1807,6 +1859,6 @@ var c = Math.sqrt(a * a + b * b);

};
if (c) res.h = normalizeHue(Math.atan2(b, a) * 180 / Math.PI);
if (alpha !== undefined) res.alpha = alpha;
if (c) { res.h = normalizeHue(Math.atan2(b, a) * 180 / Math.PI); }
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}

@@ -1818,7 +1870,7 @@ /*

*/
var convertLchToLab = (function (_ref) {
var l = _ref.l,
c = _ref.c,
h = _ref.h,
alpha = _ref.alpha;
function convertLchToLab (ref) {
var l = ref.l;
var c = ref.c;
var h = ref.h;
var alpha = ref.alpha;

@@ -1828,23 +1880,19 @@ var res = {

l: l,
a: c === 0 ? 0 : c * Math.cos(h / 180 * Math.PI),
b: c === 0 ? 0 : c * Math.sin(h / 180 * Math.PI)
a: c === 0 ? 0 : c * Math.cos( h / 180 * Math.PI ),
b: c === 0 ? 0 : c * Math.sin( h / 180 * Math.PI )
};
if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}
var convertLchToRgb = (function (c) {
return convertLabToRgb(convertLchToLab(c));
});
function convertLchToRgb (c) { return convertLabToRgb(convertLchToLab(c)); }
var convertRgbToLch = (function (c) {
return convertLabToLch(convertRgbToLab(c));
});
function convertRgbToLch (c) { return convertLabToLch(convertRgbToLab(c)); }
var parseLch = (function (color) {
function parseLch (color) {
if (typeof color !== 'string') return undefined;
var match = color.match(lch);
if (typeof color !== 'string') { return undefined; }
var match = color.match(lch$1);
if (!match) {

@@ -1866,5 +1914,5 @@ return undefined;

}
return res;
});
}

@@ -1877,3 +1925,3 @@ var lchDef = {

},
input: {
input: {
rgb: convertRgbToLch,

@@ -1883,3 +1931,3 @@ lch: convertLabToLch

channels: ['l', 'c', 'h', 'alpha'],
parsers: [parseLch],
parsers: [ parseLch ],
interpolate: {

@@ -1893,3 +1941,7 @@ h: interpolateFunctionLinear(interpolateHue()),

var M = [-0.14861, 1.78277, -0.29227, -0.90649, 1.97294, 0];
var M = [
-0.14861, 1.78277,
-0.29227, -0.90649,
1.97294, 0
];

@@ -1916,7 +1968,7 @@ var degToRad = Math.PI / 180;

var convertRgbToCubehelix = (function (_ref) {
var r = _ref.r,
g = _ref.g,
b = _ref.b,
alpha = _ref.alpha;
function convertRgbToCubehelix (ref) {
var r = ref.r;
var g = ref.g;
var b = ref.b;
var alpha = ref.alpha;

@@ -1928,19 +1980,19 @@

var res = {
var res = {
mode: 'cubehelix',
l: l,
s: l === 0 || l === 1 ? undefined : Math.sqrt(x * x + y * y) / (M[4] * l * (1 - l))
s: (l === 0 || l === 1) ? undefined : Math.sqrt(x * x + y * y) / (M[4] * l * (1 - l))
};
if (res.s) res.h = Math.atan2(y, x) * radToDeg - 120;
if (alpha !== undefined) res.alpha = alpha;
if (res.s) { res.h = Math.atan2(y, x) * radToDeg - 120; }
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}
var convertCubehelixToRgb = (function (_ref) {
var h = _ref.h,
s = _ref.s,
l = _ref.l,
alpha = _ref.alpha;
function convertCubehelixToRgb (ref) {
var h = ref.h;
var s = ref.s;
var l = ref.l;
var alpha = ref.alpha;

@@ -1950,3 +2002,3 @@ var res = { mode: 'rgb' };

h = (h === undefined ? 0 : h + 120) * degToRad;
var amp = s === undefined ? 0 : s * l * (1 - l);

@@ -1961,5 +2013,5 @@

if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}

@@ -2016,7 +2068,7 @@ /*

var convertDlabToDlch = (function (_ref) {
var l = _ref.l,
a = _ref.a,
b = _ref.b,
alpha = _ref.alpha;
function convertDlabToDlch (ref) {
var l = ref.l;
var a = ref.a;
var b = ref.b;
var alpha = ref.alpha;

@@ -2029,6 +2081,6 @@ var c = Math.sqrt(a * a + b * b);

};
if (c) res.h = normalizeHue(Math.atan2(b, a) * 180 / Math.PI);
if (alpha !== undefined) res.alpha = alpha;
if (c) { res.h = normalizeHue(Math.atan2(b, a) * 180 / Math.PI); }
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}

@@ -2040,3 +2092,3 @@ var kE = 1;

var sinθ = Math.sin(θ);
var factor = 100 / Math.log(139 / 100); // ~ 303.67
var factor = 100/Math.log(139/100); // ~ 303.67

@@ -2048,7 +2100,7 @@ /*

var convertDlchToLab = (function (_ref) {
var l = _ref.l,
c = _ref.c,
h = _ref.h,
alpha = _ref.alpha;
function convertDlchToLab (ref) {
var l = ref.l;
var c = ref.c;
var h = ref.h;
var alpha = ref.alpha;

@@ -2067,16 +2119,12 @@

var f = G * Math.sin(h / 180 * Math.PI - θ);
res.a = e * cosθ - f / 0.83 * sinθ;
res.b = e * sinθ + f / 0.83 * cosθ;
res.a = e * cosθ - (f / 0.83) * sinθ;
res.b = e * sinθ + (f / 0.83) * cosθ;
}
if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}
var convertDlabToLab = (function (c) {
return convertDlchToLab(convertDlabToDlch(c));
});
function convertDlabToLab (c) { return convertDlchToLab(convertDlabToDlch(c)); }
var convertDlabToRgb = (function (c) {
return convertLabToRgb(convertDlabToLab(c));
});
function convertDlabToRgb (c) { return convertLabToRgb(convertDlabToLab(c)); }

@@ -2087,7 +2135,7 @@ /*

var convertLabToDlch = (function (_ref) {
var l = _ref.l,
a = _ref.a,
b = _ref.b,
alpha = _ref.alpha;
function convertLabToDlch (ref) {
var l = ref.l;
var a = ref.a;
var b = ref.b;
var alpha = ref.alpha;

@@ -2107,11 +2155,11 @@ var e = a * cosθ + b * sinθ;

if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}
var convertDlchToDlab = (function (_ref) {
var l = _ref.l,
c = _ref.c,
h = _ref.h,
alpha = _ref.alpha;
function convertDlchToDlab (ref) {
var l = ref.l;
var c = ref.c;
var h = ref.h;
var alpha = ref.alpha;

@@ -2124,17 +2172,13 @@ var res = {

};
if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}
var convertLabToDlab = (function (c) {
return convertDlchToDlab(convertLabToDlch(c));
});
function convertLabToDlab (c) { return convertDlchToDlab(convertLabToDlch(c)); }
var convertRgbToDlab = (function (c) {
return convertLabToDlab(convertRgbToLab(c));
});
function convertRgbToDlab (c) { return convertLabToDlab(convertRgbToLab(c)); }
var dlabDef = {
mode: 'dlab',
output: {
output: {
lab: convertDlabToLab,

@@ -2156,13 +2200,9 @@ rgb: convertDlabToRgb

var convertDlchToRgb = (function (c) {
return convertLabToRgb(convertDlchToLab(c));
});
function convertDlchToRgb (c) { return convertLabToRgb(convertDlchToLab(c)); }
var convertRgbToDlch = (function (c) {
return convertLabToDlch(convertRgbToLab(c));
});
function convertRgbToDlch (c) { return convertLabToDlch(convertRgbToLab(c)); }
var dlchDef = {
mode: 'dlch',
output: {
output: {
lab: convertDlchToLab,

@@ -2198,3 +2238,3 @@ dlab: convertDlchToDlab,

var rgb$1 = converter('rgb');
var rgb$3 = converter('rgb');
var lrgb = converter('lrgb');

@@ -2206,3 +2246,3 @@ var hsl = converter('hsl');

var lab$1 = converter('lab');
var lch$1 = converter('lch');
var lch$2 = converter('lch');
var cubehelix = converter('cubehelix');

@@ -2212,3 +2252,3 @@ var dlab = converter('dlab');

var culori = rgb$1;
var culori = rgb$3;

@@ -2220,5 +2260,5 @@ var methods = /*#__PURE__*/Object.freeze({

hwb: hwb$1,
rgb: rgb$1,
rgb: rgb$3,
lab: lab$1,
lch: lch$1,
lch: lch$2,
lrgb: lrgb,

@@ -2246,3 +2286,6 @@ cubehelix: cubehelix,

differenceCmc: differenceCmc,
differenceDin99o: differenceDin99o,
nearest: nearest,
displayable: displayable,
clamp: clamp,
defineMode: defineMode,

@@ -2249,0 +2292,0 @@ getModeDefinition: getModeDefinition,

2

build/culori.min.js

@@ -1,1 +0,1 @@

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a=(Math.exp(.0435*o*Ri*$i)-1)/.075,d=a*Math.cos(t/180*Math.PI-Oi),v=a*Math.sin(t/180*Math.PI-Oi);e.a=d*zi-v/.83*Ci,e.b=d*Ci+v/.83*zi}return void 0!==n&&(e.alpha=n),e}function Di(i){return Ai(Ei(i))}function Li(i){var r=i.l,o=i.a,t=i.b,n=i.alpha,e=o*zi+t*Ci,a=.83*(t*zi-o*Ci),d=Math.sqrt(e*e+a*a),v={mode:"dlch",l:Fi/$i*Math.log(1+.0039*r),c:Math.log(1+.075*d)/(.0435*Ri*$i)};return v.c&&(v.h=(Math.atan2(a,e)+Oi)/Math.PI*180),void 0!==n&&(v.alpha=n),v}function Ni(i){var r=i.l,o=i.c,t=i.h,n=i.alpha,e={mode:"dlab",l:r,a:0===o?0:o*Math.cos(t/180*Math.PI),b:0===o?0:o*Math.sin(t/180*Math.PI)};return void 0!==n&&(e.alpha=n),e}function Si(i){return Ni(Li(i))}var Hi={mode:"dlab",output:{lab:Di,rgb:function(i){return si(Di(i))}},input:{lab:Si,rgb:function(i){return Si(bi(i))}},channels:["l","a","b","alpha"],interpolate:{l:g(function(i){if(2===i.length){if(void 0===i[0]&&void 0===i[1])return;return void 0!==i[0]&&void 0!==i[1]?i:void 0===i[0]?i[1]:i[0]}if(void 0!==i[0]||void 0!==i[1]||void 0!==i[2]||void 0!==i[3])return i}),a:g(function(i){if(2===i.length){if(void 0===i[0]&&void 0===i[1])return;return void 0!==i[0]&&void 0!==i[1]?i:void 0===i[0]?i[1]:i[0]}if(void 0!==i[0]||void 0!==i[1]||void 0!==i[2]||void 0!==i[3])return i}),b:g(function(i){if(2===i.length){if(void 0===i[0]&&void 0===i[1])return;return void 0!==i[0]&&void 0!==i[1]?i:void 0===i[0]?i[1]:i[0]}if(void 0!==i[0]||void 0!==i[1]||void 0!==i[2]||void 0!==i[3])return i}),alpha:g(function(i,r){if(2===i.length){if(void 0===i[0]&&void 0===i[1]||void 0===i[0]&&0===r||void 0===i[1]&&1===r)return;return[void 0===i[0]?1:i[0],void 0===i[1]?1:i[1]]}if(void 0!==i[0]||void 0!==i[1]||void 0!==i[2]||void 0!==i[3])return i.map(function(i){return void 0===i?1:i})})}};var Bi={mode:"dlch",output:{lab:Ai,dlab:Ni,rgb:function(i){return si(Ai(i))}},input:{lab:Li,dlab:Ei,rgb:function(i){return Li(bi(i))}},channels:["l","c","h","alpha"],interpolate:{l:g(function(i){if(2===i.length){if(void 0===i[0]&&void 0===i[1])return;return void 0!==i[0]&&void 0!==i[1]?i:void 0===i[0]?i[1]:i[0]}if(void 0!==i[0]||void 0!==i[1]||void 0!==i[2]||void 0!==i[3])return i}),c:g(function(i){if(2===i.length){if(void 0===i[0]&&void 0===i[1])return;return void 0!==i[0]&&void 0!==i[1]?i:void 0===i[0]?i[1]:i[0]}if(void 0!==i[0]||void 0!==i[1]||void 0!==i[2]||void 0!==i[3])return i}),h:g(p()),alpha:g(function(i,r){if(2===i.length){if(void 0===i[0]&&void 0===i[1]||void 0===i[0]&&0===r||void 0===i[1]&&1===r)return;return[void 0===i[0]?1:i[0],void 0===i[1]?1:i[1]]}if(void 0!==i[0]||void 0!==i[1]||void 0!==i[2]||void 0!==i[3])return i.map(function(i){return void 0===i?1:i})})}};t(W),t(ii),t(oi),t(ei),t(ai),t(di),t(gi),t(wi),t(ji),t(Hi),t(Bi);var Gi=a("rgb"),Ji=a("lrgb"),Ki=a("hsl"),Qi=a("hsv"),Ti=a("hsi"),Ui=a("hwb"),Vi=a("lab"),Wi=a("lch"),Xi=a("cubehelix"),Yi=a("dlab"),Zi=a("dlch"),_i=Gi,ir=Object.freeze({hsl:Ki,hsv:Qi,hsi:Ti,hwb:Ui,rgb:Gi,lab:Vi,lch:Wi,lrgb:Ji,cubehelix:Xi,dlab:Yi,dlch:Zi,formatter:function(i){return void 0===i&&(i="rgb"),function(r){var o=h(r);if(void 0!==o){var t=u(o.r),n=u(o.g),e=u(o.b);return"hex"===i?"#"+(1<<24|t<<16|n<<8|e).toString(16).slice(1):"rgb"===i?void 0===r.alpha||1===r.alpha?"rgb("+t+", "+n+", "+e+")":"rgba("+t+", "+n+", "+e+", "+l(r.alpha)+")":void 0}}},converter:a,round:v,parse:e,interpolate:function(i,r,o){void 0===r&&(r="rgb");var t=function(i,r){void 0===r&&(r="rgb");for(var o=n(r).channels,t={mode:r},e=function(r){t[o[r]]=i.map(function(i){return i[o[r]]})},a=0;a<o.length;a++)e(a);return t}(i.map(a(r)),r);o=Object.assign({},n(r).interpolate,o);var e=Object.keys(o);return function(i){i=Math.min(Math.max(0,i),1);for(var n,a={mode:r},d=0;d<e.length;d++)void 0!==(n=o[e[d]](t[e[d]],i))&&(a[e[d]]=n);return a}},interpolateNumber:f,interpolateAlpha:c,interpolateHue:p,interpolateFunctionLinear:g,interpolateFunctionSpline:function(i,r,o){return void 0===i&&(i=b),void 0===r&&(r="bspline"),void 0===o&&(o=1),function(t,n){n=Math.pow(n,o);var e=t.length-1,a=1===n?e-1:Math.floor(n*e);"natural"===r&&(t=m(t));var d=t[a],v=t[a+1],u=a>0?t[a-1]:2*d-v,h=a<e-1?t[a+2]:2*v-d,l=i([u,d,v,h]);return"object"==typeof l?M(l[0],l[1],l[2],l[3],(n-a/e)*e):l}},interpolateFunctionCosine:function(i,r){return void 0===i&&(i=b),void 0===r&&(r=1),function(o,t){var n=(t=Math.pow(t,r))*(o.length-1),e=Math.floor(n),a=o[e],d=o[e+1],v=n-e,u=i([a,d],v);if("object"==typeof u){a=u[0],d=u[1];var h=(1-Math.cos(v*Math.PI))/2;return a*(1-h)+d*h}return u}},interpolateFunctionMonotone:function(i,r){return void 0===i&&(i=b),void 0===r&&(r=1),function(o,t){t=Math.pow(t,r);var n,e=o.length-1;1===t?(n=e-1,t=1):n=Math.floor(t*e);var a=o[n],d=o[n+1],v=n>0?o[n-1]:2*a-d,u=n<e-1?o[n+2]:2*d-a,h=i([v,a,d,u]);return"object"==typeof h?w(h[0],h[1],h[2],h[3],1/e,t-n/e):h}},samples:function(i,r){if(void 0===i&&(i=2),void 0===r&&(r=1),i<2)return i<1?[]:[Math.pow(.5,r)];for(var o=[],t=0;t<i;t++)o.push(Math.pow(t/(i-1),r));return o},differenceEuclidean:E,differenceCie76:function(){return E("lab")},differenceCie94:function(i,r,o){void 0===i&&(i=1),void 0===r&&(r=.045),void 0===o&&(o=.015);var t=a("lab");return function(n,e){var a=t(n),d=t(e),v=a.l,u=a.a,h=a.b,l=Math.sqrt(u*u+h*h),f=d.l,c=d.a,s=d.b,p=Math.sqrt(c*c+s*s),b=Math.pow(v-f,2),g=Math.pow(l-p,2),M=Math.pow(u-c,2)+Math.pow(h-s,2)-g;return Math.sqrt(b/Math.pow(i,2)+g/Math.pow(1+r*l,2)+M/Math.pow(1+o*l,2))}},differenceCiede2000:function(i,r,o){void 0===i&&(i=1),void 0===r&&(r=1),void 0===o&&(o=1);var t=a("lab");return function(n,e){var a=t(n),d=t(e),v=a.l,u=a.a,h=a.b,l=Math.sqrt(u*u+h*h),f=d.l,c=d.a,s=d.b,p=(l+Math.sqrt(c*c+s*s))/2,b=.5*(1-Math.sqrt(Math.pow(p,7)/(Math.pow(p,7)+Math.pow(25,7)))),g=u*(1+b),M=c*(1+b),m=Math.sqrt(g*g+h*h),w=Math.sqrt(M*M+s*s),y=Math.abs(g)+Math.abs(h)===0?0:Math.atan2(h,g);y+=2*(y<0)*Math.PI;var k=Math.abs(M)+Math.abs(s)===0?0:Math.atan2(s,M);k+=2*(k<0)*Math.PI;var x=f-v,I=w-m,P=m*w==0?0:k-y;P-=2*(P>Math.PI)*Math.PI,P+=2*(P<-Math.PI)*Math.PI;var q,j=2*Math.sqrt(m*w)*Math.sin(P/2),E=(v+f)/2,$=(m+w)/2;m*w==0?q=y+k:(q=(y+k)/2,q-=(Math.abs(y-k)>Math.PI)*Math.PI,q+=2*(q<0)*Math.PI);var R=Math.pow(E-50,2),O=1-.17*Math.cos(q-Math.PI/6)+.24*Math.cos(2*q)+.32*Math.cos(3*q+Math.PI/30)-.2*Math.cos(4*q-63*Math.PI/180),z=1+.015*R/Math.sqrt(20+R),C=1+.045*$,F=1+.015*$*O,A=30*Math.PI/180*Math.exp(-1*Math.pow((180/Math.PI*q-275)/25,2)),D=2*Math.sqrt(Math.pow($,7)/(Math.pow($,7)+Math.pow(25,7))),L=-1*Math.sin(2*A)*D;return Math.sqrt(Math.pow(x/(i*z),2)+Math.pow(I/(r*C),2)+Math.pow(j/(o*F),2)+L*I/(r*C)*j/(o*F))}},differenceCmc:function(i,r){void 0===i&&(i=1),void 0===r&&(r=1);var o=a("lab");return function(t,n){var e=o(t),a=o(n),d=e.l,v=e.a,u=e.b,h=Math.sqrt(v*v+u*u),l=Math.atan2(u,v);l+=2*Math.PI*(l<0);var f=a.l,c=a.a,s=a.b,p=Math.sqrt(c*c+s*s),b=Math.pow(d-f,2),g=Math.pow(h-p,2),M=Math.pow(v-c,2)+Math.pow(u-s,2)-g,m=Math.sqrt(Math.pow(h,4)/(Math.pow(h,4)+1900)),w=l>=164/180*Math.PI&&l<=345/180*Math.PI?.56+Math.abs(.2*Math.cos(l+168/180*Math.PI)):.36+Math.abs(.4*Math.cos(l+35/180*Math.PI)),y=d<16?.511:.040975*d/(1+.01765*d),k=.0638*h/(1+.0131*h)+.638,x=k*(m*w+1-m);return Math.sqrt(b/Math.pow(i*y,2),g/Math.pow(r*k,2),M/Math.pow(x,2))}},differenceDin99o:function(){return E("dlab")},nearest:function(i,r,o){void 0===r&&(r=E()),void 0===o&&(o=$);var t=i.map(function(i,r){return{color:o(i),i:r}});return function(i,o,n){return void 0===o&&(o=1),void 0===n&&(n=1/0),isFinite(o)&&(o=Math.max(1,Math.min(o,t.length-1))),t.forEach(function(o){o.d=r(i,o.color)}),t.sort(function(i,r){return i.d-r.d}).slice(0,o).filter(function(i){return i.d<n}).map(function(i){return i.color})}},displayable:k,clamp:function(i){return void 0===i&&(i="rgb"),function(r){if(void 0===(r=P(r))||k(r))return r;var o=a(r.mode);if("rgb"===i)return o(j(r));r=x(r);var t=Object.assign({},r,{c:0});if(!k(t))return o(j(t));for(var n=0,e=r.c;e-n>.01;)t.c=n+.5*(e-n),k(t)?n=t.c:e=t.c;return o(t)}},defineMode:t,getModeDefinition:n,colorsNamed:O,default:_i});return Object.assign(_i,ir),_i});

1332

build/index.js

@@ -5,3 +5,3 @@ var converters = {};

var defineMode = function defineMode(definition) {
var defineMode = function (definition) {
converters[definition.mode] = Object.assign(converters[definition.mode] || {}, definition.output);

@@ -15,17 +15,11 @@ Object.keys(definition.input || {}).forEach(function (k) {

modes[definition.mode] = definition;
(definition.parsers || []).forEach(function (parser) {
return parsers.push(parser);
});
(definition.parsers || []).forEach(function (parser) { return parsers.push(parser); });
};
var getModeDefinition = function getModeDefinition(mode) {
return modes[mode];
};
var getModeDefinition = function (mode) { return modes[mode]; };
var parse = function parse(color) {
var result = void 0,
i = 0,
len = parsers.length;
var parse = function (color) {
var result, i = 0, len = parsers.length;
while (i < len) {
if ((result = parsers[i++](color)) !== undefined) break;
if ((result = parsers[i++](color)) !== undefined) { break; }
}

@@ -35,47 +29,31 @@ return result;

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) {
return typeof obj;
} : function (obj) {
return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
};
var prepare = function (color, mode) { return color === undefined ?
undefined
: typeof color !== 'object' ?
parse(color)
: color.mode === undefined ?
Object.assign({}, color, {mode: mode})
: color; };
var _extends = Object.assign || function (target) {
for (var i = 1; i < arguments.length; i++) {
var source = arguments[i];
var converter = function (target_mode) {
if ( target_mode === void 0 ) target_mode = 'rgb';
for (var key in source) {
if (Object.prototype.hasOwnProperty.call(source, key)) {
target[key] = source[key];
}
}
}
return target;
};
var prepare = function prepare(color, mode) {
return color === undefined ? undefined : (typeof color === 'undefined' ? 'undefined' : _typeof(color)) !== 'object' ? parse(color) : color.mode === undefined ? _extends({}, color, { mode: mode }) : color;
};
var converter = function converter() {
var target_mode = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 'rgb';
return function (color) {
return (color = prepare(color, target_mode)) !== undefined ?
return function (color) { return (color = prepare(color, target_mode)) !== undefined ?
// if the color's mode corresponds to our target mode
color.mode === target_mode ?
// then just return the color
color
// otherwise check to see if we have a dedicated
// converter for the target mode
: converters[color.mode][target_mode] ?
// and return its result...
converters[color.mode][target_mode](color)
// ...otherwise pass through RGB as an intermediary step.
// if the target mode is RGB...
: target_mode === 'rgb' ?
// just return the RGB
converters[color.mode].rgb(color)
// otherwise convert color.mode -> RGB -> target_mode
: converters.rgb[target_mode](converters[color.mode].rgb(color)) : undefined;
};
color.mode === target_mode ?
// then just return the color
color
// otherwise check to see if we have a dedicated
// converter for the target mode
: converters[color.mode][target_mode] ?
// and return its result...
converters[color.mode][target_mode](color)
// ...otherwise pass through RGB as an intermediary step.
// if the target mode is RGB...
: target_mode === 'rgb' ?
// just return the RGB
converters[color.mode].rgb(color)
// otherwise convert color.mode -> RGB -> target_mode
: converters.rgb[target_mode](converters[color.mode].rgb(color))
: undefined; };
};

@@ -85,24 +63,20 @@

var r = function r(value, precision) {
return Math.round(value * (precision = Math.pow(10, precision))) / precision;
};
var r = function (value, precision) { return Math.round(value * (precision = Math.pow(10, precision))) / precision; };
var round = (function () {
var precision = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 4;
return function (value) {
return typeof value === 'number' ? r(value, precision) : value;
};
});
function round (precision) {
if ( precision === void 0 ) precision = 4;
var clamp = (function (value) {
return Math.round(Math.max(0, Math.min(value, 1)) * 255);
});
return function (value) { return typeof value === 'number' ? r(value, precision) : value; };
}
var rgb = converter('rgb'),
roundAlpha = round(2);
function fixup (value) { return Math.round(Math.max(0, Math.min(value, 1)) * 255); }
var formatter = (function () {
var format = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 'rgb';
return function (c) {
var rgb = converter('rgb');
var roundAlpha = round(2);
function formatter (format) {
if ( format === void 0 ) format = 'rgb';
return function (c) {
var color = rgb(c);

@@ -114,5 +88,5 @@

var r = clamp(color.r);
var b = clamp(color.b);
var g = clamp(color.g);
var r = fixup(color.r);
var g = fixup(color.g);
var b = fixup(color.b);

@@ -126,15 +100,15 @@ if (format === 'hex') {

// opaque color
return 'rgb(' + r + ', ' + g + ', ' + b + ')';
return ("rgb(" + r + ", " + g + ", " + b + ")");
} else {
// transparent color
return 'rgba(' + r + ', ' + g + ', ' + b + ', ' + roundAlpha(c.alpha) + ')';
return ("rgba(" + r + ", " + g + ", " + b + ", " + (roundAlpha(c.alpha)) + ")");
}
}
};
});
}
var zip = (function (colors) {
var mode = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'rgb';
function zip (colors, mode) {
if ( mode === void 0 ) mode = 'rgb';
var channels = getModeDefinition(mode).channels;

@@ -144,18 +118,12 @@ var res = {

};
var _loop = function _loop(i) {
res[channels[i]] = colors.map(function (c) {
return c[channels[i]];
});
var loop = function ( i ) {
res[channels[i]] = colors.map(function (c) { return c[channels[i]]; });
};
for (var i = 0; i < channels.length; i++) {
_loop(i);
}
for (var i = 0; i < channels.length; i++) loop( i );
return res;
});
}
var interpolate = (function (colors) {
var mode = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'rgb';
var interpolations = arguments[2];
function interpolate (colors, mode, interpolations) {
if ( mode === void 0 ) mode = 'rgb';

@@ -168,4 +136,3 @@ var zipped = zip(colors.map(converter(mode)), mode);

t = Math.min(Math.max(0, t), 1);
var res = { mode: mode },
val = void 0;
var res = { mode: mode }, val;
for (var i = 0; i < keys.length; i++) {

@@ -177,4 +144,4 @@ if ((val = interpolations[keys[i]](zipped[keys[i]], t)) !== undefined) {

return res;
};
});
}
}

@@ -193,9 +160,8 @@ /*

var interpolateNumber = (function () {
return function (values) {
function interpolateNumber () { return function (values) {
if (values.length === 2) {
// Linear Number interpolation
// ---------------------------
// If both values are undefined, return undefined

@@ -217,5 +183,10 @@ if (values[0] === undefined && values[1] === undefined) {

// ---------------------------
// If all values are undefined, return undefined
if (values[0] === undefined && values[1] === undefined && values[2] === undefined && values[3] === undefined) {
if (
values[0] === undefined &&
values[1] === undefined &&
values[2] === undefined &&
values[3] === undefined
) {
return undefined;

@@ -239,4 +210,3 @@ }

}
};
});
}; }

@@ -255,9 +225,9 @@ /*

var interpolateAlpha = (function () {
return function (values, t) {
function interpolateAlpha () { return function (values, t) {
if (values.length === 2) {
// Linear Alpha interpolation
// --------------------------
// If both alphas are undefined,

@@ -267,7 +237,12 @@ // or if t is next to the undefined alpha,

// about undefined alpha being 1.
if (values[0] === undefined && values[1] === undefined || values[0] === undefined && t === 0 || values[1] === undefined && t === 1) return undefined;
if (
(values[0] === undefined && values[1] === undefined) ||
(values[0] === undefined && t === 0) ||
(values[1] === undefined && t === 1)
) { return undefined; }
// If at least one alpha is defined,
// assume alpha = 1 for any undefined values.
return [values[0] === undefined ? 1 : values[0], values[1] === undefined ? 1 : values[1]];
return [ values[0] === undefined ? 1 : values[0], values[1] === undefined ? 1 : values[1]];
} else {

@@ -279,3 +254,8 @@

// If all values are undefined, return undefined
if (values[0] === undefined && values[1] === undefined && values[2] === undefined && values[3] === undefined) {
if (
values[0] === undefined &&
values[1] === undefined &&
values[2] === undefined &&
values[3] === undefined
) {
return undefined;

@@ -286,12 +266,7 @@ }

// put alpha = 1 for any undefined values
return values.map(function (v) {
return v === undefined ? 1 : v;
});
return values.map(function (v) { return v === undefined ? 1 : v; });
}
};
});
}; }
var normalizeHue = (function (hue) {
return (hue = hue % 360) < 0 ? hue + 360 : hue;
});
function normalizeHue (hue) { return (hue = hue % 360) < 0 ? hue + 360 : hue; }

@@ -312,6 +287,7 @@ /*

var interpolateHue = (function () {
var shortPath = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : true;
return function (values) {
function interpolateHue (shortPath) {
if ( shortPath === void 0 ) shortPath = true;
return function (values) {
if (values.length === 2) {

@@ -326,3 +302,3 @@

}
// if both hues are defined, interpolate between

@@ -350,12 +326,15 @@ // the start hue and the end hue brought closest

// ------------------------
// If all values are undefined, return undefined
if (values[0] === undefined && values[1] === undefined && values[2] === undefined && values[3] === undefined) {
if (
values[0] === undefined &&
values[1] === undefined &&
values[2] === undefined &&
values[3] === undefined
) {
return undefined;
}
if (shortPath) {
return values.map(function (v) {
return normalizeHue(v);
});
return values.map(function (v) { return normalizeHue(v); });
}

@@ -365,30 +344,31 @@

return values;
}
};
});
}
// todo hue short vs. hue long
// todo normalize hue before and after interpolateHue
var identity = (function (d) {
return d;
});
function identity (d) { return d; }
var interpolateFunctionLinear = (function () {
var normalize = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : identity;
var γ = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
return function (arr, t) {
function interpolateFunctionLinear (normalize, γ) {
if ( normalize === void 0 ) normalize = identity;
if ( γ === void 0 ) γ = 1;
return function (arr, t) {
t = Math.pow(t, γ);
var cls = t * (arr.length - 1),
idx = Math.floor(cls),
a = arr[idx],
b = arr[idx + 1],
t0 = cls - idx;
var cls = t * (arr.length - 1),
idx = Math.floor(cls),
a = arr[idx],
b = arr[idx + 1],
t0 = cls - idx;
var values = normalize([a, b], t0);
return (typeof values === 'undefined' ? 'undefined' : _typeof(values)) === 'object' ? (a = values[0], b = values[1], a + t0 * (b - a)) : values;
return typeof values === 'object' ?
(a = values[0], b = values[1], a + t0 * (b - a)) :
values;
};
});
}

@@ -421,10 +401,15 @@ /*

var bspline = function bspline(Vim2, Vim1, Vi, Vip1, t) {
var bspline = function (Vim2, Vim1, Vi, Vip1, t) {
var t2 = t * t;
var t3 = t2 * t;
return ((1 - 3 * t + 3 * t2 - t3) * Vim2 + (4 - 6 * t2 + 3 * t3) * Vim1 + (1 + 3 * t + 3 * t2 - 3 * t3) * Vi + t3 * Vip1) / 6;
return (
(1 - 3 * t + 3 * t2 - t3) * Vim2 +
(4 - 6 * t2 + 3 * t3) * Vim1 +
(1 + 3 * t + 3 * t2 - 3 * t3) * Vi +
t3 * Vip1
) / 6;
};
var solve = function solve(v) {
var i;
var solve = function (v) {
var i;
var n = v.length - 1;

@@ -434,29 +419,30 @@ var c = new Array(n);

var sol = new Array(n);
c[1] = 1 / 4, _v[1] = (6 * v[1] - v[0]) / 4;
c[1] = 1/4, _v[1] = (6 * v[1] - v[0])/4;
for (i = 2; i < n; ++i) {
c[i] = 1 / (4 - c[i - 1]);
_v[i] = (6 * v[i] - (i == n - 1 ? v[n] : 0) - _v[i - 1]) * c[i];
c[i] = 1 / (4 - c[i-1]);
_v[i] = (6 * v[i] - (i == n-1 ? v[n] : 0) - _v[i-1]) * c[i];
}
sol[0] = v[0];
sol[n] = v[n];
if (n - 1 > 0) {
sol[n - 1] = _v[n - 1];
sol[n-1] = _v[n-1];
}
for (i = n - 2; i > 0; --i) {
sol[i] = _v[i] - c[i] * sol[i + 1];
for (i = n-2; i > 0; --i) {
sol[i] = _v[i] - c[i] * sol[i+1];
}
return sol;
};
var interpolateFunctionSpline = (function () {
var normalize = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : identity;
var method = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'bspline';
var γ = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;
return function (arr, t) {
function interpolateFunctionSpline (normalize, method, γ) {
if ( normalize === void 0 ) normalize = identity;
if ( method === void 0 ) method = 'bspline';
if ( γ === void 0 ) γ = 1;
return function (arr, t) {
t = Math.pow(t, γ);

@@ -472,12 +458,14 @@

var Vim1 = arr[i];
var Vi = arr[i + 1];
var Vi = arr[i+1];
var Vim2 = i > 0 ? arr[i - 1] : 2 * Vim1 - Vi;
var Vip1 = i < classes - 1 ? arr[i + 2] : 2 * Vi - Vim1;
var Vim2 = i > 0 ? arr[i-1] : 2 * Vim1 - Vi;
var Vip1 = i < classes - 1 ? arr[i+2] : 2 * Vi - Vim1;
var v = normalize([Vim2, Vim1, Vi, Vip1]);
return (typeof v === 'undefined' ? 'undefined' : _typeof(v)) === 'object' ? bspline(v[0], v[1], v[2], v[3], (t - i / classes) * classes) : v;
return typeof v === 'object' ?
bspline(v[0], v[1], v[2], v[3], (t - i / classes) * classes)
: v;
};
});
}

@@ -489,28 +477,29 @@ /*

var interpolateFunctionCosine = (function () {
var normalize = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : identity;
var γ = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
return function (arr, t) {
function interpolateFunctionCosine (normalize, γ) {
if ( normalize === void 0 ) normalize = identity;
if ( γ === void 0 ) γ = 1;
return function (arr, t) {
t = Math.pow(t, γ);
var cls = t * (arr.length - 1),
idx = Math.floor(cls),
a = arr[idx],
b = arr[idx + 1],
t0 = cls - idx;
var cls = t * (arr.length - 1),
idx = Math.floor(cls),
a = arr[idx],
b = arr[idx + 1],
t0 = cls - idx;
var values = normalize([a, b], t0);
if ((typeof values === 'undefined' ? 'undefined' : _typeof(values)) === 'object') {
if (typeof values === 'object') {
a = values[0];
b = values[1];
var c = (1 - Math.cos(t0 * Math.PI)) / 2;
return a * (1 - c) + b * c;
return (a * (1 - c) + b * c);
} else {
return values;
}
}
};
});
}
var monotone = function monotone(v0, v1, v2, v3, h, t) {
var monotone = function (v0, v1, v2, v3, h, t) {

@@ -525,10 +514,16 @@ var h2 = h * h;

return (s20 + s31 - 2 * s21) / h2 * t3 + (3 * s21 - 2 * s20 - s31) / h * t2 + s20 * t + v1;
return (
(s20 + s31 - 2 * s21) / h2 * t3 +
(3 * s21 - 2 * s20 - s31) / h * t2 +
s20 * t +
v1
);
};
var interpolateFunctionMonotone = (function () {
var normalize = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : identity;
var γ = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
return function (arr, t) {
function interpolateFunctionMonotone (normalize, γ) {
if ( normalize === void 0 ) normalize = identity;
if ( γ === void 0 ) γ = 1;
return function (arr, t) {
t = Math.pow(t, γ);

@@ -538,3 +533,3 @@

var i = void 0;
var i;
if (t === 1) {

@@ -554,9 +549,10 @@ i = n - 1;

return (typeof v === 'undefined' ? 'undefined' : _typeof(v)) === 'object' ? monotone(v[0], v[1], v[2], v[3], 1 / n, t - i / n) : v;
return typeof v === 'object' ?
monotone(v[0], v[1], v[2], v[3], 1 / n, t - i / n) : v;
};
});
}
var samples = (function () {
var n = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 2;
var γ = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
function samples (n, γ) {
if ( n === void 0 ) n = 2;
if ( γ === void 0 ) γ = 1;

@@ -571,7 +567,84 @@ if (n < 2) {

return res;
});
}
var differenceEuclidean = function differenceEuclidean() {
var mode = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 'rgb';
var rgb$1 = converter('rgb');
function displayable (color) {
var c = rgb$1(color);
return (
c !== undefined &&
c.r >= 0 && c.r <= 1 &&
c.g >= 0 && c.g <= 1 &&
c.b >= 0 && c.b <= 1
);
}
var lch = converter('lch');
var rgb$2 = converter('rgb');
var prepare$1 = function (color) { return color === undefined ?
undefined
: typeof color !== 'object' ?
parse(color)
: color.mode === undefined ?
undefined
: color; };
var clamp_value = function (v) { return Math.max(0, Math.min(v, 1)); };
var clamp_rgb = function (color) {
var c = rgb$2(color);
c.r = clamp_value(c.r);
c.g = clamp_value(c.g);
c.b = clamp_value(c.b);
return c;
};
function clamp (method) {
if ( method === void 0 ) method = 'rgb';
return function (color) {
color = prepare$1(color);
// if the color is undefined or displayable, return it directly
if (color === undefined || displayable(color)) { return color; }
// keep track of color's original mode
var conv = converter(color.mode);
if (method === 'rgb') {
return conv(clamp_rgb(color));
}
// convert to LCh for clamping
color = lch(color);
// try with chroma = 0
var clamped = Object.assign({}, color, {c: 0});
// if not even chroma = 0 is displayable
// fall back to RGB clamping
if (!displayable(clamped)) {
return conv(clamp_rgb(clamped));
}
// By this time we know chroma = 0 is displayable and our current chroma is not.
// Find the displayable chroma through the bisection method.
var start = 0, end = color.c, delta = 0.01;
while (end - start > delta) {
clamped.c = start + (end - start) * 0.5;
if (displayable(clamped)) {
start = clamped.c;
} else {
end = clamped.c;
}
}
return conv(clamped);
};
}
var differenceEuclidean = function (mode) {
if ( mode === void 0 ) mode = 'rgb';
var channels = getModeDefinition(mode).channels;

@@ -582,22 +655,20 @@ var conv = converter(mode);

var ConvSmp = conv(smp);
return Math.sqrt(channels.reduce(function (delta, k) {
return (
// ignore alpha channel in computing the euclidean distance
delta + (k === 'alpha' ? 0 : Math.pow(ConvStd[k] - ConvSmp[k], 2))
);
}, 0));
};
return Math.sqrt(
channels.reduce(
function (delta, k) { return delta + (k === 'alpha' ? 0 : Math.pow(ConvStd[k] - ConvSmp[k], 2)); },
0
)
);
}
};
var differenceCie76 = function differenceCie76() {
return differenceEuclidean('lab');
};
var differenceCie76 = function () { return differenceEuclidean('lab'); };
var differenceCie94 = function differenceCie94() {
var kL = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 1;
var K1 = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0.045;
var K2 = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0.015;
var differenceCie94 = function (kL, K1, K2) {
if ( kL === void 0 ) kL = 1;
if ( K1 === void 0 ) K1 = 0.045;
if ( K2 === void 0 ) K2 = 0.015;
var lab = converter('lab');
return function (std, smp) {

@@ -623,4 +694,8 @@

return Math.sqrt(dL2 / Math.pow(kL, 2) + dC2 / Math.pow(1 + K1 * cStd, 2) + dH2 / Math.pow(1 + K2 * cStd, 2));
};
return Math.sqrt(
dL2 / Math.pow(kL, 2) +
dC2 / Math.pow(1 + K1 * cStd, 2) +
dH2 / Math.pow(1 + K2 * cStd, 2)
);
}
};

@@ -635,6 +710,6 @@

var differenceCiede2000 = function differenceCiede2000() {
var Kl = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 1;
var Kc = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
var Kh = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;
var differenceCiede2000 = function (Kl, Kc, Kh) {
if ( Kl === void 0 ) Kl = 1;
if ( Kc === void 0 ) Kc = 1;
if ( Kh === void 0 ) Kh = 1;

@@ -657,3 +732,3 @@ var lab = converter('lab');

var cAvg = (cStd + cSmp) / 2;
var G = 0.5 * (1 - Math.sqrt(Math.pow(cAvg, 7) / (Math.pow(cAvg, 7) + Math.pow(25, 7))));

@@ -663,18 +738,18 @@

var apSmp = aSmp * (1 + G);
var cpStd = Math.sqrt(apStd * apStd + bStd * bStd);
var cpSmp = Math.sqrt(apSmp * apSmp + bSmp * bSmp);
var hpStd = Math.abs(apStd) + Math.abs(bStd) === 0 ? 0 : Math.atan2(bStd, apStd);
hpStd += (hpStd < 0) * 2 * Math.PI;
hpStd += (hpStd < 0) * 2 * Math.PI;
var hpSmp = Math.abs(apSmp) + Math.abs(bSmp) === 0 ? 0 : Math.atan2(bSmp, apSmp);
hpSmp += (hpSmp < 0) * 2 * Math.PI;
hpSmp += (hpSmp < 0) * 2 * Math.PI;
var dL = lSmp - lStd;
var dC = cpSmp - cpStd;
var dhp = cpStd * cpSmp === 0 ? 0 : hpSmp - hpStd;
dhp -= (dhp > Math.PI) * 2 * Math.PI;
dhp += (dhp < -Math.PI) * 2 * Math.PI;
dhp -= (dhp > Math.PI) * 2 * Math.PI;
dhp += (dhp < -Math.PI) * 2 * Math.PI;

@@ -686,3 +761,3 @@ var dH = 2 * Math.sqrt(cpStd * cpSmp) * Math.sin(dhp / 2);

var hp = void 0;
var hp;
if (cpStd * cpSmp === 0) {

@@ -697,20 +772,31 @@ hp = hpStd + hpSmp;

var Lpm50 = Math.pow(Lp - 50, 2);
var T = 1 - 0.17 * Math.cos(hp - Math.PI / 6) + 0.24 * Math.cos(2 * hp) + 0.32 * Math.cos(3 * hp + Math.PI / 30) - 0.20 * Math.cos(4 * hp - 63 * Math.PI / 180);
var Sl = 1 + 0.015 * Lpm50 / Math.sqrt(20 + Lpm50);
var T = 1 -
0.17 * Math.cos(hp - Math.PI / 6) +
0.24 * Math.cos(2 * hp) +
0.32 * Math.cos(3 * hp + Math.PI / 30) -
0.20 * Math.cos(4 * hp - 63 * Math.PI / 180);
var Sl = 1 + (0.015 * Lpm50) / Math.sqrt(20 + Lpm50);
var Sc = 1 + 0.045 * Cp;
var Sh = 1 + 0.015 * Cp * T;
var deltaTheta = 30 * Math.PI / 180 * Math.exp(-1 * Math.pow((180 / Math.PI * hp - 275)/25, 2));
var Rc = 2 * Math.sqrt(
Math.pow(Cp, 7) / (Math.pow(Cp, 7) + Math.pow(25, 7))
);
var deltaTheta = 30 * Math.PI / 180 * Math.exp(-1 * Math.pow((180 / Math.PI * hp - 275) / 25, 2));
var Rc = 2 * Math.sqrt(Math.pow(Cp, 7) / (Math.pow(Cp, 7) + Math.pow(25, 7)));
var Rt = -1 * Math.sin(2 * deltaTheta) * Rc;
return Math.sqrt(Math.pow(dL / (Kl * Sl), 2) + Math.pow(dC / (Kc * Sc), 2) + Math.pow(dH / (Kh * Sh), 2) + Rt * dC / (Kc * Sc) * dH / (Kh * Sh));
};
return Math.sqrt(
Math.pow(dL / (Kl * Sl), 2) +
Math.pow(dC / (Kc * Sc), 2) +
Math.pow(dH / (Kh * Sh), 2) +
Rt * dC / (Kc * Sc) * dH / (Kh * Sh)
);
}
};
var differenceCmc = function differenceCmc() {
var l = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 1;
var c = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
var differenceCmc = function (l, c) {
if ( l === void 0 ) l = 1;
if ( c === void 0 ) c = 1;

@@ -728,3 +814,3 @@ var lab = converter('lab');

var hStd = Math.atan2(bStd, aStd);
hStd = hStd + 2 * Math.PI * (hStd < 0);
hStd = hStd + 2 * Math.PI * (hStd < 0);

@@ -741,12 +827,21 @@ var lSmp = LabSmp.l;

var F = Math.sqrt(Math.pow(cStd, 4) / (Math.pow(cStd, 4) + 1900));
var T = hStd >= 164 / 180 * Math.PI && hStd <= 345 / 180 * Math.PI ? 0.56 + Math.abs(0.2 * Math.cos(hStd + 168 / 180 * Math.PI)) : 0.36 + Math.abs(0.4 * Math.cos(hStd + 35 / 180 * Math.PI));
var T = hStd >= (164 / 180 * Math.PI) &&
hStd <= (345 / 180 * Math.PI) ?
0.56 + Math.abs(0.2 * Math.cos(hStd + 168 / 180 * Math.PI))
: 0.36 + Math.abs(0.4 * Math.cos(hStd + 35 / 180 * Math.PI));
var Sl = lStd < 16 ? 0.511 : 0.040975 * lStd / (1 + 0.01765 * lStd);
var Sl = lStd < 16 ? 0.511 : ((0.040975 * lStd) / (1 + 0.01765 * lStd));
var Sc = 0.0638 * cStd / (1 + 0.0131 * cStd) + 0.638;
var Sh = Sc * (F * T + 1 - F);
return Math.sqrt(dL2 / Math.pow(l * Sl, 2), dC2 / Math.pow(c * Sc, 2), dH2 / Math.pow(Sh, 2));
return Math.sqrt(
dL2 / Math.pow(l * Sl, 2),
dC2 / Math.pow(c * Sc, 2),
dH2 / Math.pow(Sh, 2)
);
};
};
var differenceDin99o = function () { return differenceEuclidean('dlab'); };
// selects the vantage point

@@ -764,3 +859,3 @@ // currently does so randomly, but this could be optimized

// const vptree = (colors, metric) => {
// let color = select(colors);

@@ -792,18 +887,14 @@ // let dist = median(color, colors, metric);

//
var identity$1 = function identity(d) {
return d;
};
var identity$1 = function (d) { return d; };
var nearest = (function (colors) {
var metric = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : differenceEuclidean();
var accesor = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : identity$1;
function nearest (colors, metric, accesor) {
if ( metric === void 0 ) metric = differenceEuclidean();
if ( accesor === void 0 ) accesor = identity$1;
var arr = colors.map(function (c, idx) {
return { color: accesor(c), i: idx };
});
return function (color) {
var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
var τ = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : Infinity;
var arr = colors.map(function (c, idx) { return ({ color: accesor(c), i: idx }); });
return function (color, n, τ) {
if ( n === void 0 ) n = 1;
if ( τ === void 0 ) τ = Infinity;
if (isFinite(n)) {

@@ -817,16 +908,10 @@ n = Math.max(1, Math.min(n, arr.length - 1));

return arr.sort(function (a, b) {
return a.d - b.d;
}).slice(0, n).filter(function (c) {
return c.d < τ;
}).map(function (c) {
return c.color;
});
};
});
return arr.sort(function (a, b) { return a.d - b.d; }).slice(0, n).filter(function (c) { return c.d < τ; }).map(function (c) { return c.color; });
}
}
var parseNumber = (function (color, len) {
function parseNumber (color, len) {
if (typeof color !== 'number') { return; }
if (typeof color !== 'number') return;
// hex3: #c93 -> #cc9933

@@ -836,5 +921,5 @@ if (len === 3) {

mode: 'rgb',
r: (color >> 8 & 0xF | color >> 4 & 0xF0) / 255,
g: (color >> 4 & 0xF | color & 0xF0) / 255,
b: (color & 0xF | color << 4 & 0xF0) / 255
r: ((color >> 8 & 0xF) | (color >> 4 & 0xF0)) / 255,
g: ((color >> 4 & 0xF) | (color & 0xF0)) / 255,
b: ((color & 0xF) | (color << 4 & 0xF0)) / 255
};

@@ -847,9 +932,9 @@ }

mode: 'rgb',
r: (color >> 12 & 0xF | color >> 8 & 0xF0) / 255,
g: (color >> 8 & 0xF | color >> 4 & 0xF0) / 255,
b: (color >> 4 & 0xF | color & 0xF0) / 255,
alpha: (color & 0xF | color << 4 & 0xF0) / 255
r: ((color >> 12 & 0xF) | (color >> 8 & 0xF0)) / 255,
g: ((color >> 8 & 0xF) | (color >> 4 & 0xF0)) / 255,
b: ((color >> 4 & 0xF) | (color & 0xF0)) / 255,
alpha: ((color & 0xF) | (color << 4 & 0xF0)) / 255
};
}
// hex6: #f0f1f2

@@ -859,4 +944,4 @@ if (len === 6) {

mode: 'rgb',
r: (color >> 16 & 0xFF) / 255,
g: (color >> 8 & 0xFF) / 255,
r: (color >> 16 & 0xFF) / 255,
g: (color >> 8 & 0xFF) / 255,
b: (color & 0xFF) / 255

@@ -870,9 +955,9 @@ };

mode: 'rgb',
r: (color >> 24 & 0xFF) / 255,
g: (color >> 16 & 0xFF) / 255,
b: (color >> 8 & 0xFF) / 255,
r: (color >> 24 & 0xFF) / 255,
g: (color >> 16 & 0xFF) / 255,
b: (color >> 8 & 0xFF) / 255,
alpha: (color & 0xFF) / 255
};
}
});
}

@@ -1000,3 +1085,3 @@ var named = {

// Added in CSS Colors Level 4: https://drafts.csswg.org/css-color/#changes-from-3
rebeccapurple: 0x663399,
rebeccapurple: 0x663399,
red: 0xff0000,

@@ -1034,5 +1119,5 @@ rosybrown: 0xbc8f8f,

// https://drafts.csswg.org/css-color/#transparent-black
var parseNamed = (function (color) {
return typeof color === 'string' && parseNumber(named[color.toLowerCase()], 6) || undefined;
});
function parseNamed (color) {
return (typeof color === 'string' && parseNumber(named[color.toLowerCase()], 6)) || undefined;
}

@@ -1048,7 +1133,7 @@ /*

var num = (/([+-]?\d*\.?\d+(?:[eE][+-]?\d+)?)/ + '').replace(/^\/|\/$/g, ''); // number
var per = num + '%'; // percentage
var alpha = '(?:' + num + '%|' + num + ')'; // alpha-value
var hue = '(?:' + num + '(deg|grad|rad|turn)|' + num + ')'; // hue
var c = '\\s*,\\s*'; // comma
var s = '\\s+'; // space
var per = num + "%"; // percentage
var alpha = "(?:" + num + "%|" + num + ")"; // alpha-value
var hue = "(?:" + num + "(deg|grad|rad|turn)|" + num + ")"; // hue
var c = "\\s*,\\s*"; // comma
var s = "\\s+"; // space

@@ -1060,6 +1145,6 @@

*/
var rgb_num_old = new RegExp('^rgba?\\(\\s*' + num + c + num + c + num + '\\s*(?:,\\s*' + alpha + '\\s*)?\\)$');
var rgb_per_old = new RegExp('^rgba?\\(\\s*' + per + c + per + c + per + '\\s*(?:,\\s*' + alpha + '\\s*)?\\)$');
var rgb_num_new = new RegExp('^rgba?\\(\\s*' + num + s + num + s + num + '\\s*(?:\\/\\s*' + alpha + '\\s*)?\\)$');
var rgb_per_new = new RegExp('^rgba?\\(\\s*' + per + s + per + s + per + '\\s*(?:\\/\\s*' + alpha + '\\s*)?\\)$');
var rgb_num_old = new RegExp(("^rgba?\\(\\s*" + num + c + num + c + num + "\\s*(?:,\\s*" + alpha + "\\s*)?\\)$"));
var rgb_per_old = new RegExp(("^rgba?\\(\\s*" + per + c + per + c + per + "\\s*(?:,\\s*" + alpha + "\\s*)?\\)$"));
var rgb_num_new = new RegExp(("^rgba?\\(\\s*" + num + s + num + s + num + "\\s*(?:\\/\\s*" + alpha + "\\s*)?\\)$"));
var rgb_per_new = new RegExp(("^rgba?\\(\\s*" + per + s + per + s + per + "\\s*(?:\\/\\s*" + alpha + "\\s*)?\\)$"));

@@ -1070,4 +1155,4 @@ /*

*/
var hsl_old = new RegExp('^hsla?\\(\\s*' + hue + c + per + c + per + '\\s*(?:,\\s*' + alpha + '\\s*)?\\)$');
var hsl_new = new RegExp('^hsla?\\(\\s*' + hue + s + per + s + per + '\\s*(?:\\/\\s*' + alpha + '\\s*)?\\)$');
var hsl_old = new RegExp(("^hsla?\\(\\s*" + hue + c + per + c + per + "\\s*(?:,\\s*" + alpha + "\\s*)?\\)$"));
var hsl_new = new RegExp(("^hsla?\\(\\s*" + hue + s + per + s + per + "\\s*(?:\\/\\s*" + alpha + "\\s*)?\\)$"));

@@ -1083,3 +1168,3 @@ /*

*/
var hwb = new RegExp('^hwb\\(\\s*' + hue + s + per + s + per + '\\s*(?:\\/\\s*' + alpha + '\\s*)?\\)$');
var hwb = new RegExp(("^hwb\\(\\s*" + hue + s + per + s + per + "\\s*(?:\\/\\s*" + alpha + "\\s*)?\\)$"));

@@ -1090,4 +1175,4 @@ /*

*/
var lab = new RegExp('^lab\\(\\s*' + num + s + num + s + num + '\\s*(?:\\/\\s*' + alpha + '\\s*)?\\)$');
var lch = new RegExp('^lch\\(\\s*' + num + s + num + s + hue + '\\s*(?:\\/\\s*' + alpha + '\\s*)?\\)$');
var lab = new RegExp(("^lab\\(\\s*" + num + s + num + s + num + "\\s*(?:\\/\\s*" + alpha + "\\s*)?\\)$"));
var lch$1 = new RegExp(("^lch\\(\\s*" + num + s + num + s + hue + "\\s*(?:\\/\\s*" + alpha + "\\s*)?\\)$"));

@@ -1098,27 +1183,26 @@ /*

*/
var gray = new RegExp('^gray\\(\\s*' + num + '()()\\s*(?:\\/\\s*' + alpha + '\\s*)?\\)$');
var gray = new RegExp(("^gray\\(\\s*" + num + "()()\\s*(?:\\/\\s*" + alpha + "\\s*)?\\)$"));
var parseHex = (function (color) {
function parseHex (color) {
var match;
return (match = color.match(hex)) ? parseNumber(parseInt(match[1], 16), match[1].length) : undefined;
});
}
var parseRgb = (function (color) {
function parseRgb (color) {
var match, res;
var match = void 0,
res = void 0;
if (match = color.match(rgb_num_old) || color.match(rgb_num_new)) {
res = {
res = {
mode: 'rgb',
r: match[1] / 255,
g: match[2] / 255,
b: match[3] / 255
r: match[1] / 255,
g: match[2] / 255,
b: match[3] / 255
};
} else if (match = color.match(rgb_per_old) || color.match(rgb_per_new)) {
res = {
res = {
mode: 'rgb',
r: match[1] / 100,
g: match[2] / 100,
b: match[3] / 100
r: match[1] / 100,
g: match[2] / 100,
b: match[3] / 100
};

@@ -1134,9 +1218,7 @@ } else {

}
return res;
});
}
var parseTransparent = (function (c) {
return c === 'transparent' ? parseNumber(0x00000000, 8) : undefined;
});
function parseTransparent (c) { return c === 'transparent' ? parseNumber(0x00000000, 8) : undefined; }

@@ -1146,3 +1228,3 @@ var rgbDef = {

channels: ['r', 'g', 'b', 'alpha'],
parsers: [parseHex, parseRgb, parseNamed, parseTransparent],
parsers: [ parseHex, parseRgb, parseNamed, parseTransparent ],
interpolate: {

@@ -1156,11 +1238,9 @@ r: interpolateFunctionLinear(interpolateNumber()),

var fn = function fn(c) {
return c < 0.04045 ? c / 12.92 : Math.pow((c + 0.055) / 1.055, 2.4);
};
var fn = function (c) { return c < 0.04045 ? c / 12.92 : Math.pow((c + 0.055) / 1.055, 2.4); };
var convertRgbToLrgb = (function (_ref) {
var r = _ref.r,
g = _ref.g,
b = _ref.b,
alpha = _ref.alpha;
function convertRgbToLrgb (ref) {
var r = ref.r;
var g = ref.g;
var b = ref.b;
var alpha = ref.alpha;

@@ -1173,15 +1253,13 @@ var res = {

};
if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}
var fn$1 = function fn(c) {
return c > 0.0031308 ? 1.055 * Math.pow(c, 1 / 2.4) - 0.055 : 12.92 * c;
};
var fn$1 = function (c) { return c > 0.0031308 ? 1.055 * Math.pow(c, 1/2.4) - 0.055 : 12.92 * c; };
var convertLrgbToRgb = (function (_ref) {
var r = _ref.r,
g = _ref.g,
b = _ref.b,
alpha = _ref.alpha;
function convertLrgbToRgb (ref) {
var r = ref.r;
var g = ref.g;
var b = ref.b;
var alpha = ref.alpha;

@@ -1194,5 +1272,5 @@ var res = {

};
if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}

@@ -1204,3 +1282,3 @@ var lrgbDef = {

},
input: {
input: {
rgb: convertRgbToLrgb

@@ -1219,30 +1297,23 @@ },

function convertHslToRgb (_ref) {
var h = _ref.h,
s = _ref.s,
l = _ref.l,
alpha = _ref.alpha;
function convertHslToRgb(ref) {
var h = ref.h;
var s = ref.s;
var l = ref.l;
var alpha = ref.alpha;
h = normalizeHue(h);
var m1 = l + s * (l < 0.5 ? l : 1 - l);
var m2 = m1 - (m1 - l) * 2 * Math.abs(h / 60 % 2 - 1);
var res = void 0;
switch (Math.floor(h / 60)) {
case 0:
res = { r: m1, g: m2, b: 2 * l - m1 };break;
case 1:
res = { r: m2, g: m1, b: 2 * l - m1 };break;
case 2:
res = { r: 2 * l - m1, g: m1, b: m2 };break;
case 3:
res = { r: 2 * l - m1, g: m2, b: m1 };break;
case 4:
res = { r: m2, g: 2 * l - m1, b: m1 };break;
case 5:
res = { r: m1, g: 2 * l - m1, b: m2 };break;
default:
res = { r: 2 * l - m1, g: 2 * l - m1, b: 2 * l - m1 };
var m2 = m1 - (m1 - l) * 2 * Math.abs(h/60 % 2 - 1);
var res;
switch (Math.floor(h/60)) {
case 0: res = { r: m1, g: m2, b: 2 * l - m1 }; break;
case 1: res = { r: m2, g: m1, b: 2 * l - m1 }; break;
case 2: res = { r: 2 * l - m1, g: m1, b: m2 }; break;
case 3: res = { r: 2 * l - m1, g: m2, b: m1 }; break;
case 4: res = { r: m2, g: 2 * l - m1, b: m1 }; break;
case 5: res = { r: m1, g: 2 * l - m1, b: m2 }; break;
default: res = { r: 2 * l - m1, g: 2 * l - m1, b: 2 * l - m1 };
}
res.mode = 'rgb';
if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;

@@ -1253,10 +1324,9 @@ }

function convertRgbToHsl (_ref) {
var r = _ref.r,
g = _ref.g,
b = _ref.b,
alpha = _ref.alpha;
function convertRgbToHsl(ref) {
var r = ref.r;
var g = ref.g;
var b = ref.b;
var alpha = ref.alpha;
var M = Math.max(r, g, b),
m = Math.min(r, g, b);
var M = Math.max(r, g, b), m = Math.min(r, g, b);
var res = {

@@ -1267,24 +1337,20 @@ mode: 'hsl',

};
if (M - m !== 0) res.h = (M === r ? (g - b) / (M - m) + (g < b) * 6 : M === g ? (b - r) / (M - m) + 2 : (r - g) / (M - m) + 4) * 60;
if (alpha !== undefined) res.alpha = alpha;
if (M - m !== 0) { res.h = (M === r ? (g - b) / (M - m) + (g < b) * 6 : M === g ? (b - r) / (M - m) + 2 : (r - g) / (M - m) + 4) * 60; }
if (alpha !== undefined) { res.alpha = alpha; }
return res;
}
var hue$1 = function hue(val, unit) {
var hue$1 = function (val, unit) {
switch (unit) {
case 'deg':
return +val;
case 'rad':
return val / Math.PI * 180;
case 'grad':
return val / 10 * 9;
case 'turn':
return val * 360;
case 'deg': return +val;
case 'rad': return val / Math.PI * 180;
case 'grad': return val / 10 * 9;
case 'turn': return val * 360;
}
};
var parseHsl = (function (color) {
if (typeof color !== 'string') return;
function parseHsl (color) {
if (typeof color !== 'string') { return; }
var match = color.match(hsl_old) || color.match(hsl_new);
if (!match) return;
if (!match) { return; }
var res = {

@@ -1302,8 +1368,8 @@ mode: 'hsl',

return res;
});
}
var hslDef = {
mode: 'hsl',
output: {
rgb: convertHslToRgb
output: {
rgb: convertHslToRgb
},

@@ -1314,3 +1380,3 @@ input: {

channels: ['h', 's', 'l', 'alpha'],
parsers: [parseHsl],
parsers: [ parseHsl ],
interpolate: {

@@ -1326,29 +1392,22 @@ h: interpolateFunctionLinear(interpolateHue()),

function convertHsvToRgb (_ref) {
var h = _ref.h,
s = _ref.s,
v = _ref.v,
alpha = _ref.alpha;
function convertHsvToRgb(ref) {
var h = ref.h;
var s = ref.s;
var v = ref.v;
var alpha = ref.alpha;
h = normalizeHue(h);
var f = Math.abs(h / 60 % 2 - 1);
var res = void 0;
switch (Math.floor(h / 60)) {
case 0:
res = { r: v, g: v * (1 - s * f), b: v * (1 - s) };break;
case 1:
res = { r: v * (1 - s * f), g: v, b: v * (1 - s) };break;
case 2:
res = { r: v * (1 - s), g: v, b: v * (1 - s * f) };break;
case 3:
res = { r: v * (1 - s), g: v * (1 - s * f), b: v };break;
case 4:
res = { r: v * (1 - s * f), g: v * (1 - s), b: v };break;
case 5:
res = { r: v, g: v * (1 - s), b: v * (1 - s * f) };break;
default:
res = { r: v * (1 - s), g: v * (1 - s), b: v * (1 - s) };
var f = Math.abs(h/60 % 2 - 1);
var res;
switch (Math.floor(h/60)) {
case 0: res = { r: v, g: v * (1 - s * f), b: v * (1 - s) }; break;
case 1: res = { r: v * (1 - s * f), g: v, b: v * (1 - s) }; break;
case 2: res = { r: v * (1 - s), g: v, b: v * (1 - s * f) }; break;
case 3: res = { r: v * (1 - s), g: v * (1 - s * f), b: v }; break;
case 4: res = { r: v * (1 - s * f), g: v * (1 - s), b: v }; break;
case 5: res = { r: v, g: v * (1 - s), b: v * (1 - s * f) }; break;
default: res = { r: v * (1 - s), g: v * (1 - s), b: v * (1 - s) };
}
res.mode = 'rgb';
if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;

@@ -1359,10 +1418,9 @@ }

function convertRgbToHsv (_ref) {
var r = _ref.r,
g = _ref.g,
b = _ref.b,
alpha = _ref.alpha;
function convertRgbToHsv(ref) {
var r = ref.r;
var g = ref.g;
var b = ref.b;
var alpha = ref.alpha;
var M = Math.max(r, g, b),
m = Math.min(r, g, b);
var M = Math.max(r, g, b), m = Math.min(r, g, b);
var res = {

@@ -1373,4 +1431,4 @@ mode: 'hsv',

};
if (M - m !== 0) res.h = (M === r ? (g - b) / (M - m) + (g < b) * 6 : M === g ? (b - r) / (M - m) + 2 : (r - g) / (M - m) + 4) * 60;
if (alpha !== undefined) res.alpha = alpha;
if (M - m !== 0) { res.h = (M === r ? (g - b) / (M - m) + (g < b) * 6 : M === g ? (b - r) / (M - m) + 2 : (r - g) / (M - m) + 4) * 60; }
if (alpha !== undefined) { res.alpha = alpha; }
return res;

@@ -1381,4 +1439,4 @@ }

mode: 'hsv',
output: {
rgb: convertHsvToRgb
output: {
rgb: convertHsvToRgb
},

@@ -1399,51 +1457,51 @@ input: {

function convertHsiToRgb (_ref) {
var h = _ref.h,
s = _ref.s,
i = _ref.i,
alpha = _ref.alpha;
function convertHsiToRgb (ref) {
var h = ref.h;
var s = ref.s;
var i = ref.i;
var alpha = ref.alpha;
h = normalizeHue(h);
var f = Math.abs(h / 60 % 2 - 1);
var res = void 0;
switch (Math.floor(h / 60)) {
case 0:
var f = Math.abs(h/60 % 2 - 1);
var res;
switch (Math.floor(h/60)) {
case 0:
res = {
r: i * (1 + s * (3 / (2 - f) - 1)),
g: i * (1 + s * (3 * (1 - f) / (2 - f) - 1)),
r: i * (1 + s * (3 / (2 - f) - 1)),
g: i * (1 + s * (3 * (1 - f) / (2 - f) - 1)),
b: i * (1 - s)
};
break;
case 1:
case 1:
res = {
r: i * (1 + s * (3 * (1 - f) / (2 - f) - 1)),
g: i * (1 + s * (3 / (2 - f) - 1)),
r: i * (1 + s * (3 * (1 - f) / (2 - f) - 1)),
g: i * (1 + s * (3 / (2 - f) - 1)),
b: i * (1 - s)
};
break;
case 2:
case 2:
res = {
r: i * (1 - s),
g: i * (1 + s * (3 / (2 - f) - 1)),
r: i * (1 - s),
g: i * (1 + s * (3 / (2 - f) - 1)),
b: i * (1 + s * (3 * (1 - f) / (2 - f) - 1))
};
break;
case 3:
case 3:
res = {
r: i * (1 - s),
g: i * (1 + s * (3 * (1 - f) / (2 - f) - 1)),
r: i * (1 - s),
g: i * (1 + s * (3 * (1 - f) / (2 - f) - 1)),
b: i * (1 + s * (3 / (2 - f) - 1))
};
break;
case 4:
case 4:
res = {
r: i * (1 + s * (3 * (1 - f) / (2 - f) - 1)),
g: i * (1 - s),
r: i * (1 + s * (3 * (1 - f) / (2 - f) - 1)),
g: i * (1 - s),
b: i * (1 + s * (3 / (2 - f) - 1))
};
break;
case 5:
case 5:
res = {
r: i * (1 + s * (3 / (2 - f) - 1)),
g: i * (1 - s),
r: i * (1 + s * (3 / (2 - f) - 1)),
g: i * (1 - s),
b: i * (1 + s * (3 * (1 - f) / (2 - f) - 1))

@@ -1457,3 +1515,3 @@ };

res.mode = 'rgb';
if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;

@@ -1464,10 +1522,9 @@ }

function convertRgbToHsi (_ref) {
var r = _ref.r,
g = _ref.g,
b = _ref.b,
alpha = _ref.alpha;
function convertRgbToHsi(ref) {
var r = ref.r;
var g = ref.g;
var b = ref.b;
var alpha = ref.alpha;
var M = Math.max(r, g, b),
m = Math.min(r, g, b);
var M = Math.max(r, g, b), m = Math.min(r, g, b);
var res = {

@@ -1478,4 +1535,4 @@ mode: 'hsi',

};
if (M - m !== 0) res.h = (M === r ? (g - b) / (M - m) + (g < b) * 6 : M === g ? (b - r) / (M - m) + 2 : (r - g) / (M - m) + 4) * 60;
if (alpha !== undefined) res.alpha = alpha;
if (M - m !== 0) { res.h = (M === r ? (g - b) / (M - m) + (g < b) * 6 : M === g ? (b - r) / (M - m) + 2 : (r - g) / (M - m) + 4) * 60; }
if (alpha !== undefined) { res.alpha = alpha; }
return res;

@@ -1486,4 +1543,4 @@ }

mode: 'hsi',
output: {
rgb: convertHsiToRgb
output: {
rgb: convertHsiToRgb
},

@@ -1500,3 +1557,3 @@ input: {

}
};
}

@@ -1513,7 +1570,7 @@ /*

function convertHwbToRgb (_ref) {
var h = _ref.h,
w = _ref.w,
b = _ref.b,
alpha = _ref.alpha;
function convertHwbToRgb (ref) {
var h = ref.h;
var w = ref.w;
var b = ref.b;
var alpha = ref.alpha;

@@ -1523,11 +1580,11 @@ // normalize w + b to 1

var s = w + b;
w /= s;
w /= s;
b /= s;
}
return convertHsvToRgb({
h: h,
s: b === 1 ? 1 : 1 - w / (1 - b),
return convertHsvToRgb({
h: h,
s: b === 1 ? 1 : 1 - w / (1 - b),
v: 1 - b,
alpha: alpha
});
});
}

@@ -1547,3 +1604,3 @@

var hsv = convertRgbToHsv(rgba);
if (hsv === undefined) return undefined;
if (hsv === undefined) { return undefined; }
var res = {

@@ -1554,11 +1611,11 @@ mode: 'hwb',

};
if (hsv.h !== undefined) res.h = hsv.h;
if (hsv.alpha !== undefined) res.alpha = hsv.alpha;
if (hsv.h !== undefined) { res.h = hsv.h; }
if (hsv.alpha !== undefined) { res.alpha = hsv.alpha; }
return res;
}
var parseHwb = (function (color) {
if (typeof color !== 'string') return undefined;
function parseHwb (color) {
if (typeof color !== 'string') { return undefined; }
var match = color.match(hwb);
if (!match) return undefined;
if (!match) { return undefined; }
var res = {

@@ -1570,7 +1627,7 @@ mode: 'hwb',

};
// normalize w + b to at most 1
if (res.w + res.b > 1) {
var s = res.w + res.b;
res.w /= s;
res.w /= s;
res.b /= s;

@@ -1585,8 +1642,8 @@ }

return res;
});
}
var hwbDef = {
mode: 'hwb',
output: {
rgb: convertHwbToRgb
output: {
rgb: convertHwbToRgb
},

@@ -1597,3 +1654,3 @@ input: {

channels: ['h', 'w', 'b', 'alpha'],
parsers: [parseHwb],
parsers: [ parseHwb ],
interpolate: {

@@ -1616,19 +1673,17 @@ h: interpolateFunctionLinear(interpolateHue()),

var Zn = 0.82521;
var k = Math.pow(29, 3) / Math.pow(3, 3);
var e = Math.pow(6, 3) / Math.pow(29, 3);
var fn$2 = function fn(v) {
return Math.pow(v, 3) > e ? Math.pow(v, 3) : (116 * v - 16) / k;
};
var fn$2 = function (v) { return Math.pow(v, 3) > e ? Math.pow(v, 3) : (116 * v - 16) / k; };
var convertLabToXyz = (function (_ref) {
var l = _ref.l,
a = _ref.a,
b = _ref.b;
function convertLabToXyz (ref) {
var l = ref.l;
var a = ref.a;
var b = ref.b;
var fy = (l + 16) / 116;
var fx = a / 500 + fy;
var fz = fy - b / 200;
var fx = a / 500 + fy;
var fz = fy - b / 200;

@@ -1640,3 +1695,3 @@ return {

};
});
}

@@ -1651,19 +1706,20 @@ /*

var convertXyzToRgb = (function (_ref) {
var x = _ref.x,
y = _ref.y,
z = _ref.z;
function convertXyzToRgb (ref) {
var x = ref.x;
var y = ref.y;
var z = ref.z;
return convertLrgbToRgb({
r: x * 3.1338561 - y * 1.6168667 - 0.4906146 * z,
g: x * -0.9787684 + y * 1.9161415 + 0.0334540 * z,
b: x * 0.0719453 - y * 0.2289914 + 1.4052427 * z
});
r: x * 3.1338561 - y * 1.6168667 - 0.4906146 * z,
g: x * -0.9787684 + y * 1.9161415 + 0.0334540 * z,
b: x * 0.0719453 - y * 0.2289914 + 1.4052427 * z
});
}
var convertLabToRgb = (function (lab) {
function convertLabToRgb (lab) {
var res = convertXyzToRgb(convertLabToXyz(lab));
res.mode = 'rgb';
if (lab.alpha !== undefined) res.alpha = lab.alpha;
if (lab.alpha !== undefined) { res.alpha = lab.alpha; }
return res;
});
}

@@ -1679,8 +1735,7 @@ /*

var convertRgbToXyz = (function (rgb) {
var _convertRgbToLrgb = convertRgbToLrgb(rgb),
r = _convertRgbToLrgb.r,
g = _convertRgbToLrgb.g,
b = _convertRgbToLrgb.b;
function convertRgbToXyz (rgb) {
var ref = convertRgbToLrgb(rgb);
var r = ref.r;
var g = ref.g;
var b = ref.b;
return {

@@ -1691,29 +1746,27 @@ x: 0.4360747 * r + 0.3850649 * g + 0.1430804 * b,

};
});
}
var f = function f(value) {
return value > e ? Math.cbrt(value) : (k * value + 16) / 116;
};
var f = function (value) { return value > e ? Math.cbrt(value) : (k * value + 16) / 116; };
var convertXyzToLab = (function (_ref) {
var x = _ref.x,
y = _ref.y,
z = _ref.z;
function convertXyzToLab (ref) {
var x = ref.x;
var y = ref.y;
var z = ref.z;
var f0 = f(x / Xn);
var f1 = f(y / Yn);
var f2 = f(z / Zn);
var f0 = f(x/Xn);
var f1 = f(y/Yn);
var f2 = f(z/Zn);
return {
mode: 'lab',
l: 116 * f1 - 16,
l: (116 * f1) - 16,
a: 500 * (f0 - f1),
b: 200 * (f1 - f2)
};
});
}
var convertRgbToLab = (function (rgb) {
function convertRgbToLab (rgb) {
var res = convertXyzToLab(convertRgbToXyz(rgb));
// Fixes achromatic RGB colors having a _slight_ chroma due to floating-point errors

@@ -1725,11 +1778,10 @@ // and approximated computations in sRGB <-> CIELab.

}
if (rgb.alpha !== undefined) res.alpha = rgb.alpha;
if (rgb.alpha !== undefined) { res.alpha = rgb.alpha; }
return res;
});
}
var parseLab = (function (color) {
if (typeof color !== 'string') return undefined;
function parseLab (color) {
if (typeof color !== 'string') { return undefined; }
var match = void 0,
res = void 0;
var match, res;

@@ -1761,8 +1813,8 @@ if (match = color.match(lab)) {

return res;
});
}
var labDef = {
mode: 'lab',
output: {
rgb: convertLabToRgb
output: {
rgb: convertLabToRgb
},

@@ -1773,3 +1825,3 @@ input: {

channels: ['l', 'a', 'b', 'alpha'],
parsers: [parseLab],
parsers: [ parseLab ],
interpolate: {

@@ -1788,7 +1840,7 @@ l: interpolateFunctionLinear(interpolateNumber()),

*/
var convertLabToLch = (function (_ref) {
var l = _ref.l,
a = _ref.a,
b = _ref.b,
alpha = _ref.alpha;
function convertLabToLch (ref) {
var l = ref.l;
var a = ref.a;
var b = ref.b;
var alpha = ref.alpha;

@@ -1801,6 +1853,6 @@ var c = Math.sqrt(a * a + b * b);

};
if (c) res.h = normalizeHue(Math.atan2(b, a) * 180 / Math.PI);
if (alpha !== undefined) res.alpha = alpha;
if (c) { res.h = normalizeHue(Math.atan2(b, a) * 180 / Math.PI); }
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}

@@ -1812,7 +1864,7 @@ /*

*/
var convertLchToLab = (function (_ref) {
var l = _ref.l,
c = _ref.c,
h = _ref.h,
alpha = _ref.alpha;
function convertLchToLab (ref) {
var l = ref.l;
var c = ref.c;
var h = ref.h;
var alpha = ref.alpha;

@@ -1822,23 +1874,19 @@ var res = {

l: l,
a: c === 0 ? 0 : c * Math.cos(h / 180 * Math.PI),
b: c === 0 ? 0 : c * Math.sin(h / 180 * Math.PI)
a: c === 0 ? 0 : c * Math.cos( h / 180 * Math.PI ),
b: c === 0 ? 0 : c * Math.sin( h / 180 * Math.PI )
};
if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}
var convertLchToRgb = (function (c) {
return convertLabToRgb(convertLchToLab(c));
});
function convertLchToRgb (c) { return convertLabToRgb(convertLchToLab(c)); }
var convertRgbToLch = (function (c) {
return convertLabToLch(convertRgbToLab(c));
});
function convertRgbToLch (c) { return convertLabToLch(convertRgbToLab(c)); }
var parseLch = (function (color) {
function parseLch (color) {
if (typeof color !== 'string') return undefined;
var match = color.match(lch);
if (typeof color !== 'string') { return undefined; }
var match = color.match(lch$1);
if (!match) {

@@ -1860,5 +1908,5 @@ return undefined;

}
return res;
});
}

@@ -1871,3 +1919,3 @@ var lchDef = {

},
input: {
input: {
rgb: convertRgbToLch,

@@ -1877,3 +1925,3 @@ lch: convertLabToLch

channels: ['l', 'c', 'h', 'alpha'],
parsers: [parseLch],
parsers: [ parseLch ],
interpolate: {

@@ -1887,3 +1935,7 @@ h: interpolateFunctionLinear(interpolateHue()),

var M = [-0.14861, 1.78277, -0.29227, -0.90649, 1.97294, 0];
var M = [
-0.14861, 1.78277,
-0.29227, -0.90649,
1.97294, 0
];

@@ -1910,7 +1962,7 @@ var degToRad = Math.PI / 180;

var convertRgbToCubehelix = (function (_ref) {
var r = _ref.r,
g = _ref.g,
b = _ref.b,
alpha = _ref.alpha;
function convertRgbToCubehelix (ref) {
var r = ref.r;
var g = ref.g;
var b = ref.b;
var alpha = ref.alpha;

@@ -1922,19 +1974,19 @@

var res = {
var res = {
mode: 'cubehelix',
l: l,
s: l === 0 || l === 1 ? undefined : Math.sqrt(x * x + y * y) / (M[4] * l * (1 - l))
s: (l === 0 || l === 1) ? undefined : Math.sqrt(x * x + y * y) / (M[4] * l * (1 - l))
};
if (res.s) res.h = Math.atan2(y, x) * radToDeg - 120;
if (alpha !== undefined) res.alpha = alpha;
if (res.s) { res.h = Math.atan2(y, x) * radToDeg - 120; }
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}
var convertCubehelixToRgb = (function (_ref) {
var h = _ref.h,
s = _ref.s,
l = _ref.l,
alpha = _ref.alpha;
function convertCubehelixToRgb (ref) {
var h = ref.h;
var s = ref.s;
var l = ref.l;
var alpha = ref.alpha;

@@ -1944,3 +1996,3 @@ var res = { mode: 'rgb' };

h = (h === undefined ? 0 : h + 120) * degToRad;
var amp = s === undefined ? 0 : s * l * (1 - l);

@@ -1955,5 +2007,5 @@

if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}

@@ -2010,7 +2062,7 @@ /*

var convertDlabToDlch = (function (_ref) {
var l = _ref.l,
a = _ref.a,
b = _ref.b,
alpha = _ref.alpha;
function convertDlabToDlch (ref) {
var l = ref.l;
var a = ref.a;
var b = ref.b;
var alpha = ref.alpha;

@@ -2023,6 +2075,6 @@ var c = Math.sqrt(a * a + b * b);

};
if (c) res.h = normalizeHue(Math.atan2(b, a) * 180 / Math.PI);
if (alpha !== undefined) res.alpha = alpha;
if (c) { res.h = normalizeHue(Math.atan2(b, a) * 180 / Math.PI); }
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}

@@ -2034,3 +2086,3 @@ var kE = 1;

var sinθ = Math.sin(θ);
var factor = 100 / Math.log(139 / 100); // ~ 303.67
var factor = 100/Math.log(139/100); // ~ 303.67

@@ -2042,7 +2094,7 @@ /*

var convertDlchToLab = (function (_ref) {
var l = _ref.l,
c = _ref.c,
h = _ref.h,
alpha = _ref.alpha;
function convertDlchToLab (ref) {
var l = ref.l;
var c = ref.c;
var h = ref.h;
var alpha = ref.alpha;

@@ -2061,16 +2113,12 @@

var f = G * Math.sin(h / 180 * Math.PI - θ);
res.a = e * cosθ - f / 0.83 * sinθ;
res.b = e * sinθ + f / 0.83 * cosθ;
res.a = e * cosθ - (f / 0.83) * sinθ;
res.b = e * sinθ + (f / 0.83) * cosθ;
}
if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}
var convertDlabToLab = (function (c) {
return convertDlchToLab(convertDlabToDlch(c));
});
function convertDlabToLab (c) { return convertDlchToLab(convertDlabToDlch(c)); }
var convertDlabToRgb = (function (c) {
return convertLabToRgb(convertDlabToLab(c));
});
function convertDlabToRgb (c) { return convertLabToRgb(convertDlabToLab(c)); }

@@ -2081,7 +2129,7 @@ /*

var convertLabToDlch = (function (_ref) {
var l = _ref.l,
a = _ref.a,
b = _ref.b,
alpha = _ref.alpha;
function convertLabToDlch (ref) {
var l = ref.l;
var a = ref.a;
var b = ref.b;
var alpha = ref.alpha;

@@ -2101,11 +2149,11 @@ var e = a * cosθ + b * sinθ;

if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}
var convertDlchToDlab = (function (_ref) {
var l = _ref.l,
c = _ref.c,
h = _ref.h,
alpha = _ref.alpha;
function convertDlchToDlab (ref) {
var l = ref.l;
var c = ref.c;
var h = ref.h;
var alpha = ref.alpha;

@@ -2118,17 +2166,13 @@ var res = {

};
if (alpha !== undefined) res.alpha = alpha;
if (alpha !== undefined) { res.alpha = alpha; }
return res;
});
}
var convertLabToDlab = (function (c) {
return convertDlchToDlab(convertLabToDlch(c));
});
function convertLabToDlab (c) { return convertDlchToDlab(convertLabToDlch(c)); }
var convertRgbToDlab = (function (c) {
return convertLabToDlab(convertRgbToLab(c));
});
function convertRgbToDlab (c) { return convertLabToDlab(convertRgbToLab(c)); }
var dlabDef = {
mode: 'dlab',
output: {
output: {
lab: convertDlabToLab,

@@ -2150,13 +2194,9 @@ rgb: convertDlabToRgb

var convertDlchToRgb = (function (c) {
return convertLabToRgb(convertDlchToLab(c));
});
function convertDlchToRgb (c) { return convertLabToRgb(convertDlchToLab(c)); }
var convertRgbToDlch = (function (c) {
return convertLabToDlch(convertRgbToLab(c));
});
function convertRgbToDlch (c) { return convertLabToDlch(convertRgbToLab(c)); }
var dlchDef = {
mode: 'dlch',
output: {
output: {
lab: convertDlchToLab,

@@ -2192,3 +2232,3 @@ dlab: convertDlchToDlab,

var rgb$1 = converter('rgb');
var rgb$3 = converter('rgb');
var lrgb = converter('lrgb');

@@ -2200,3 +2240,3 @@ var hsl = converter('hsl');

var lab$1 = converter('lab');
var lch$1 = converter('lch');
var lch$2 = converter('lch');
var cubehelix = converter('cubehelix');

@@ -2206,5 +2246,5 @@ var dlab = converter('dlab');

var culori = rgb$1;
var culori = rgb$3;
export default culori;
export { hsl, hsv, hsi, hwb$1 as hwb, rgb$1 as rgb, lab$1 as lab, lch$1 as lch, lrgb, cubehelix, dlab, dlch, formatter, converter, round, parse, interpolate, interpolateNumber, interpolateAlpha, interpolateHue, interpolateFunctionLinear, interpolateFunctionSpline, interpolateFunctionCosine, interpolateFunctionMonotone, samples, differenceEuclidean, differenceCie76, differenceCie94, differenceCiede2000, differenceCmc, nearest, defineMode, getModeDefinition, named as colorsNamed };
export { hsl, hsv, hsi, hwb$1 as hwb, rgb$3 as rgb, lab$1 as lab, lch$2 as lch, lrgb, cubehelix, dlab, dlch, formatter, converter, round, parse, interpolate, interpolateNumber, interpolateAlpha, interpolateHue, interpolateFunctionLinear, interpolateFunctionSpline, interpolateFunctionCosine, interpolateFunctionMonotone, samples, differenceEuclidean, differenceCie76, differenceCie94, differenceCiede2000, differenceCmc, differenceDin99o, nearest, displayable, clamp, defineMode, getModeDefinition, named as colorsNamed };

8

package.json
{
"name": "culori",
"version": "0.3.73",
"version": "0.4.0",
"main": "build/culori.js",

@@ -14,9 +14,5 @@ "module": "build/index.js",

"devDependencies": {
"babel-core": "^6.26.0",
"babel-plugin-transform-object-rest-spread": "^6.26.0",
"babel-preset-es2015-rollup": "^3.0.0",
"mathjs": "^4.0.1",
"nyc": "^11.6.0",
"rollup": "^0.57.1",
"rollup-plugin-babel": "^3.0.3",
"rollup-plugin-buble": "^0.19.2",
"rollup-plugin-uglify": "^3.0.0",

@@ -23,0 +19,0 @@ "tap-spec": "^4.1.1",

331

README.md

@@ -0,41 +1,330 @@

# Culori
<figure style='text-align: center'>
<img src='./.github/man-rainbow.jpg' width='400'/>
<figcaption style='font-size: 0.8em'>“Man before a rainbow” (ca. 1700) — <a href='https://www.rijksmuseum.nl/en/collection/RP-P-1896-A-19368-1803'>Rijksmuseum</a>, via <a href='https://publicdomainreview.org'>The Public Domain Review</a>.</figcaption>
<img src='https://github.com/danburzo/culori/.github/man-rainbow.jpg' width='400'/>
<figcaption style='font-size: 0.8em'>“Man before a rainbow” (ca. 1700) — <a href='https://www.rijksmuseum.nl/en/collection/RP-P-1896-A-19368-1803'>Rijksmuseum</a>, via <a href='https://publicdomainreview.org'>The Public Domain Review</a>.</figcaption>
</figure>
# Culori
⚠ _Until __v1.0.0__ the API is a work-in-progress and will be changing quite a bit._
Culori is a general-purpose color library for JavaScript. It incorporates, and extends, ideas from Mike Bostock's [D3.js](https://github.com/d3) and Gregor Aisch's [chroma.js](https://github.com/gka/chroma.js).
_(⚠ Until I realease __v1.0.0__ you can assume the API will be changing quite a bit, until I find an adequate expression.)_
__Color Spaces__. Culori supports all the formats defined in the [CSS Colors Level 4][css4-colors]: [Named colors][css4-named-colors], [Hex colors](https://drafts.csswg.org/css-color/#hex-notation) (3 to 8 digits), [RGB](https://drafts.csswg.org/css-color/#rgb-functions), [HSL](https://drafts.csswg.org/css-color/#the-hsl-notation), [HWB](https://drafts.csswg.org/css-color/#the-hwb-notation), [Lab and LCh](https://drafts.csswg.org/css-color/#lab-colors), and [Grays](https://drafts.csswg.org/css-color/#grays). Additionally, the [Linear RGB](https://en.wikipedia.org/wiki/SRGB#The_sRGB_transfer_function_(%22gamma%22)), [HSV](https://en.wikipedia.org/wiki/HSL_and_HSV) (also known as HSB), [HSI](https://en.wikipedia.org/wiki/HSL_and_HSV), and [Cubehelix](https://www.mrao.cam.ac.uk/%7Edag/CUBEHELIX/) color spaces are supported.
### Color Spaces
__Color Differences__. Culori can compute [color differences](https://en.wikipedia.org/wiki/Color_difference) with either a simple Euclidean distance or the CIELAB Delta E* metric as formulated by CIE76, CIE94, CIEDE2000 and CMC l:c (1984). They're also available [as a D3 plugin](https://github.com/danburzo/d3-color-difference). It can also find the closest N colors from a set of colors based on any of these differences.
Culori supports all the formats defined in the [CSS Colors Level 4][css4-colors]: [Named colors][css4-named-colors], [Hex colors](https://drafts.csswg.org/css-color/#hex-notation) (3 to 8 digits), [RGB](https://drafts.csswg.org/css-color/#rgb-functions), [HSL](https://drafts.csswg.org/css-color/#the-hsl-notation), [HWB](https://drafts.csswg.org/css-color/#the-hwb-notation), [Lab and LCh](https://drafts.csswg.org/css-color/#lab-colors), and [Grays](https://drafts.csswg.org/css-color/#grays). Additionally, the [Linear RGB](https://en.wikipedia.org/wiki/SRGB#The_sRGB_transfer_function_(%22gamma%22)), [HSV](https://en.wikipedia.org/wiki/HSL_and_HSV) (also known as HSB), [HSI](https://en.wikipedia.org/wiki/HSL_and_HSV), and [Cubehelix](https://www.mrao.cam.ac.uk/%7Edag/CUBEHELIX/) color spaces are supported.
## Foreword
### Color Differences
If you're thinking _Do we really need another JavaScript color library?_, I hear you. Reader, for the most part, we don't. Mike Bostock's [d3-color](https://github.com/d3/d3-color), and Gregor Aisch's [chroma.js](https://github.com/gka/chroma.js) are two robust libraries that provide most of what you need for working with colors on the web<sup>1</sup>. I'll admit Culori<sup>2</sup> is foremost a reflection of my own curiousity in understanding color spaces at a deeper level. But it also ended up a fairly fast, and fairly comprehensive, toolkit for manipulating colors — and with an implementation that has certain advantages.
Culori can compute [color differences](https://en.wikipedia.org/wiki/Color_difference) with either a simple Euclidean distance or the CIELAB Delta E* metric as formulated by CIE76, CIE94, CIEDE2000 and CMC l:c (1984). They're also available [as a D3 plugin](https://github.com/danburzo/d3-color-difference).
The _alpha_ channel which governs a color's opacity is treated differently than in other libaries, in that we don't equate an _undefined_ alpha with an alpha of 1. The hex string <kbd>#ff0000</kbd> _should_ eventually be interpreted as a fully-opaque red color, but at the color-manipulation level we want to draw the distinction between <kbd>#ff0000</kbd> and <kbd>#ff0000ff</kbd>, which has an explicit alpha channel.
It can also find the closest N colors from a set of colors based on any of these differences.
When developing the API, I tried to balance brevity, convenience and flexibility. It ended up a more-or-less functional API, i.e. a collection of functions you can pipe data through. It's not as readable as a fluent API where you chain methods, but it's much more flexible, I think.
## Documentation
---
* [Getting Started with Culori](./docs/tutorial.md)
* [Culori Recipes](./docs/recipes.md)
* [Extending Culori](./docs/extending.md)
* [API Reference](./docs/api.md)
* [Benchmarks](./docs/benchmarks.md)
* [Further Reading](./docs/readings.md)
<sup>1</sup> Other popular libraries you may want to look at are [TinyColor](https://github.com/bgrins/TinyColor) by [Brian Grinstead](http://briangrinstead.com), [color](https://github.com/Qix-/color) by Heather Arthur, [color.js](https://github.com/brehaut/color-js) by Andrew Brehaut et al, and [chromatist](https://github.com/jrus/chromatist) by [Jacob Rus](http://www.hcs.harvard.edu/~jrus/).
## About the project
<sup>2</sup> from the Romanian word for ‘colors’.
Culori is written by [Dan Burzo](http://danburzo.ro) and is released under the [MIT License](./LICENSE).
## Getting Started
It builds upon the ideas of two thoroughly documented and time-tested projects: [d3-color](https://github.com/d3/d3-color) and [d3-interpolate](https://github.com/d3/d3-interpolate) by [Mike Bostock](https://bost.ocks.org/mike/), and [chroma.js](https://github.com/gka/chroma.js) by [Gregor Aisch](https://driven-by-data.net/).
TODO
You may also want to look at [TinyColor](https://github.com/bgrins/TinyColor) by [Brian Grinstead](http://briangrinstead.com), [color](https://github.com/Qix-/color) by [Heather Arthur](https://github.com/Qix-/), and [color.js](https://github.com/brehaut/color-js) by Andrew Brehaut et al.
## API Reference
* [Color representation](#color-representation)
* [A note on the API](#a-note-on-the-api)
* [Basics methods](#basic-methods)
* [Interpolation](#interpolation)
* [Difference](#difference)
### Color representation
Culori does not have a _Color_ class. Instead, it uses plain objects to represent colors:
```js
// A color in the RGB space
{
mode: 'rgb',
r: 0.1,
g: 0.2,
b: 1,
alpha: 1
}
```
The object needs to have a `mode` property that identifies the color space, and values for each channel in that particular color space. See the [Color Spaces](#color-spaces) section for the channels expected of each color space. Optionally, the `alpha` property is used for the color's alpha channel.
### A note on the API
TODO explain Functional style and its benefits.
### Basic methods
<a name="culoriParse" href="#culoriParse">#</a> culori.__parse__(_string_) → _color_ or _undefined_ [<>](https://github.com/danburzo/culori/blob/master/src/parse.js "Source")
Parses a string and returns the corresponding _color_. The color will be in the matching color space, e.g. RGB for hex strings, HSL for `hsl(…, …, …)` strings, et cetera. If no built-in parsers can match the string, the function will return _undefined_.
```js
// named colors
culori.parse('red'); // ⇒ { r: 1, g: 0, b: 0, mode: 'rgb' }
// hex strings
culori.parse('#ff0000'); // ⇒ { r: 1, g: 0, b: 0, mode: 'rgb' }
// HSL color
culori.parse('hsl(60 50% 10% / 100%)'); // ⇒ { h: 60, s: 0.5, b: 0.1, alpha: 1, mode: 'hsl' }
// Lab color
culori.parse('lab(100 -50 50)'); // ⇒ { l: 100, a: -50, b: 50, mode: 'lab' }
```
<a name="culoriConverter" href="#culoriConverter">#</a> culori.__converter__(_mode = "rgb"_) → _function (color or String)_ [<>](https://github.com/danburzo/culori/blob/master/src/converter.js "Source")
Returns a function that can then convert any color to the _mode_ color space:
```js
var rgb = culori.converter('rgb');
rgb('#f0f0f0'); // ⇒ { "mode": "rgb", "r": 0.4980392156862745, "g": 0.4980392156862745, "b": 0.4980392156862745 }
```
Converters accept either strings (which will be parsed with `culori.parse`) or color objects. If the `mode` key is absent from the color, it's assumed to be in the converter's color space.
The available modes (color spaces) are listed below. Each color space has a convenience method for converting to that color space.
Mode | For | Shortcut
---- | --- | --------
`rgb` | RGB color space | __culori__( _color_ ) and culori.__rgb__( _color_ )
`hsl` | HSL color space | culori.__hsl__(_color_)
`hsv` | HSV color space | culori.__hsv__(_color_)
`hsi` | HSI color space | culori.__hsi__(_color_)
`hwb` | HWB color space | culori.__hwb__(_color_)
`lab` | Lab color space | culori.__lab__(_color_)
`lch` | LCh color space | culori.__lch__(_color_)
`lrgb`| Linearized RGB color space | culori.__lrgb__(_color_)
`cubehelix` | Cubehelix color space | culori.__cubehelix__(_color_)
`dlab` | DIN99o Lab color space | culori.__dlab__(_color_)
`dlch` | DIN99o LCh color space | culori.__dlch__(_color_)
<a name="culoriFormatter" href="#culoriFormatter">#</a> culori.__formatter__(_format = 'rgb'_) → _function (color)_ [<>](https://github.com/danburzo/culori/blob/master/src/formatter.js "Source")
Returns a formatter function that can transform colors to useful string representations.
```js
let hex = culori.formatter('hex');
hex('red'); // ⇒ "#ff0000"
```
Available formats:
Format | Description
------ | -----------
`hex` | Returns the hex string for a color
`rgb` | Returns the `rgb(…)` / `rgba(…)` string for a color
<a name="culoriDisplayable" href="#culoriDisplayable">#</a> culori.__displayable__(_color_ or _String_) [<>](https://github.com/danburzo/culori/blob/master/src/displayable.js "Source")
For some color spaces — particularly Lab and LCh — not all colors that can be expressed can be displayed on-screen. This function lets you check whether a particular color fits inside the sRGB gamut, i.e. that its `r`, `g`, and `b` channels are in the interval `[0, 1]`.
```js
culori.displayable('red'); // ⇒ true
culori.displayable('rgb(300 255 255)'); // ⇒ false
```
<a name="culoriClamp" href="#culoriClamp">#</a> culori.__clamp__(_method = 'rgb'_) → _function (color)_ [<>](https://github.com/danburzo/culori/blob/master/src/clamp.js "Source")
Returns a function which you can then use to retreive a representation of any color that's displayable on the screen, i.e. fits within the sRGB gamut. There are two available methods:
* `method = 'rgb'` clamps the `r`, `g`, `b` channel values of the color's RGB representation to the interval `[0, 1]`;
* `method = 'lch'` converts the color to the LCh space and finds the largest Chroma channel value that's displayable for the given Lightness and Hue; if not even the achromatic version (Chroma = 0) of the LCh color is displayable, it falls back to the `rgb` method.
```js
culori.clamp('lch')('lch(50 120 5)'); // ⇒ { mode: 'lch', l: 50, c: 77.48291015625, h: 5 }
```
<a name="culoriRound" href="#culoriRound">#</a> culori.__round__(_n = 8_) [<>](https://github.com/danburzo/culori/blob/master/src/round.js "Source")
A (rather miscellaneous) utility that returns a function with which to round numbers to at most _n_ digits of precision.
```js
let approximate = culori.round(4);
approximate(0.38393993); // => 0.3839
```
### Interpolation
<a name="culoriInterpolate" href="#culoriInterpolate">#</a> culori.__interpolate__(_colors_, _mode = "rgb"_) [<>](https://github.com/danburzo/culori/blob/master/src/interpolate/interpolate.js "Source")
Returns an interpolator between an array of colors in the _mode_ color space.
<a name="culoriSamples" href="#culoriSamples">#</a> culori.__samples__(_n = 2_, _γ = 1_) [<>](https://github.com/danburzo/culori/blob/master/src/samples.js "Source")
Returns an array of _n_ equally-spaced samples from the `[0, 1]` range, with `0` and `1` at the ends. The function also accepts a _γ_ (gamma) parameter which will map each value _t_ to _t_<sup>γ</sup>.
```js
culori.samples(3); // => [0, 0.5, 1]
culori.samples(5); // => [0, 0.25, 0.5, 0.75, 1]
```
The samples are useful for [culori.interpolate()](#culoriInterpolate) to generate color scales:
```js
let grays = culori.interpolate(['#fff', '#000']);
samples(5).map(grays);
```
#### Interpolation functions
<a name="culoriInterpolateFunctionLinear" href="#culoriInterpolateFunctionLinear">#</a> culori.__interpolateFunctionLinear__ [<>](https://github.com/danburzo/culori/blob/master/src/interpolate/interpolateFunctionLinear.js "Source")
<a name="culoriInterpolateFunctionSpline" href="#culoriInterpolateFunctionSpline">#</a> culori.__interpolateFunctionSpline__ [<>](https://github.com/danburzo/culori/blob/master/src/interpolate/interpolateFunctionSpline.js "Source")
<a name="culoriInterpolateFunctionMonotone" href="#culoriInterpolateFunctionMonotone">#</a> culori.__interpolateFunctionMonotone__ [<>](https://github.com/danburzo/culori/blob/master/src/interpolate/interpolateFunctionMonotone.js "Source")
<a name="culoriInterpolateFunctionCosine" href="#culoriInterpolateFunctionCosine">#</a> culori.__interpolateFunctionCosine__ [<>](https://github.com/danburzo/culori/blob/master/src/interpolate/interpolateFunctionCosine.js "Source")
#### Interpolation modes
<a name="culoriInterpolateNumber" href="#culoriInterpolateNumber">#</a> culori.__interpolateNumber__ [<>](https://github.com/danburzo/culori/blob/master/src/interpolate/interpolateNumber.js "Source")
<a name="culoriInterpolateHue" href="#culoriInterpolateHue">#</a> culori.__interpolateHue__ [<>](https://github.com/danburzo/culori/blob/master/src/interpolate/interpolateHue.js "Source")
<a name="culoriInterpolateNumber" href="#culoriInterpolateNumber">#</a> culori.__interpolateAlpha__ [<>](https://github.com/danburzo/culori/blob/master/src/interpolate/interpolateNumber.js "Source")
### Difference
These methods are concerned to finding the [distance between two colors](https://en.wikipedia.org/wiki/Color_difference) based on various formulas. Each of these formulas will return a _function (colorA, colorB)_ that lets you measure the distance between two colors. Also available as a separate [d3 plugin](https://github.com/danburzo/d3-color-difference).
<a name="culoriDifferenceEuclidean" href="#culoriDifferenceEuclidean">#</a> culori.__differenceEuclidean__(_mode = 'rgb'_) [<>](https://github.com/danburzo/culori/blob/master/src/difference.js "Source")
Returns a [Euclidean distance](https://en.wikipedia.org/wiki/Color_difference#Euclidean) function in a certain color space.
<a name="culoriDifferenceCie76" href="#culoriDifferenceCie76">#</a> culori.__differenceCie76__() [<>](https://github.com/danburzo/culori/blob/master/src/difference.js "Source")
Computes the [CIE76][CIE76] ΔE\*<sub>ab</sub> color difference between the colors _a_ and _b_. The computation is done in the Lab color space and it is analogous to [culori.differenceEuclidean('lab')](#culoriDifferenceEuclidean).
<a name="culoriDifferenceCie94" href="#culoriDifferenceCie94">#</a> culori.__differenceCie94__(_kL = 1_, _K1 = 0.045_, _K2 = 0.015_) [<>](https://github.com/danburzo/culori/blob/master/src/difference.js "Source")
Computes the [CIE94][CIE94] ΔE\*<sub>94</sub> color difference between the colors _a_ and _b_. The computation is done in the Lab color space.
<a name="culoriDifferenceCiede2000" href="#culoriDifferenceCiede2000">#</a> culori.__differenceCiede2000__(_Kl = 1_, _Kc = 1_, _Kh = 1_) [<>](https://github.com/danburzo/culori/blob/master/src/difference.js "Source")
Computes the [CIEDE2000][CIEDE2000] ΔE\*<sub>00</sub> color difference between the colors _a_ and _b_ as implemented by [G. Sharma](http://www2.ece.rochester.edu/~gsharma/ciede2000/). The computation is done in the Lab color space.
Returns a [CIEDE2000](https://en.wikipedia.org/wiki/Color_difference#CIEDE2000) Delta E* function.
<a name="culoriDifferenceCmc" href="#culoriDifferenceCmc">#</a> culori.__differenceCmc__() [<>](https://github.com/danburzo/culori/blob/master/src/difference.js "Source")
Computes the [CMC l:c (1984)][CMC] ΔE\*<sub>CMC</sub> color difference between the colors _a_ and _b_. The computation is done in the Lab color space.
_Note:_ ΔE\*<sub>CMC</sub> is not considered a metric since it's not symmetrical, i.e. the distance from _a_ to _b_ is not always equal to the distance from _b_ to _a_. Therefore it cannot be reliably used with [culori.nearest()](#culoriNearest).
<a name="culoriDifferenceDin99o" href="#culoriDifferenceDin99o">#</a> culori.__differenceDin99o__() [<>](https://github.com/danburzo/culori/blob/master/src/difference.js "Source")
Computes the [DIN99o][DIN99oDE] ΔE\*<sub>99o</sub> color difference between the colors _a_ and _b_. The computation is done in the [DIN99o][DIN99o] color space.
#### Nearest color(s)
<a name="culoriNearest" href="#culoriNearest">#</a> culori.__nearest__(_colors_, _metric = differenceEuclidean()_, _accessor = identity_) → _function(color, n = 1, τ = Infinity)_ [<>](https://github.com/danburzo/culori/blob/master/src/nearest.js "Source")
For a given _metric_ color difference formula, and an array of _colors_, returns a function with which you can find _n_ colors nearest to _color_, with a maximum distance of _τ_.
Pass _n = Infinity_ to get all colors in the array with a maximum distance of _τ_.
## Color Spaces
TODO
### HSL
The figure above shows a slice of the HSL color space for a particular hue:
<img src='./.github/hsl-spectrum.png' width='200'/>
### HSV
The figure above shows a slice of the HSV color space for a particular hue:
<img src='./.github/hsv-spectrum.png' width='200'/>
### HSI
The figure above shows a slice of the HSI color space for a particular hue:
<img src='./.github/hsi-spectrum.png' width='200'/>
## Culori Recipes
#### Relative luminance of a color
The [relative luminance](https://en.wikipedia.org/wiki/Relative_luminance) of a color is defined as:
```js
L = 0.2126 * R + 0.7152 * G + 0.0722 * B
```
Where R, G, and B are the components from the LRGB color space.
To compute it in Culori:
```js
function luminance(color) {
let c = culori.lrgb(color);
return 0.2126 * c.r + 0.7152 * c.g + 0.0722 * c.b;
}
```
__Note:__ The WCAG defines the luminance using a [deprecated value](https://github.com/w3c/wcag/issues/236#issuecomment-379526596) for converting sRGB to LRGB. If you'd like a strict implementation, you'll need to write your own sRGB → LRGB conversion.
#### Contrast ratio
Using the `luminance()` function above, the `contrast()` ratio is simply the ratio between the luminances of two colors, with the values shifted by 0.05 to avoid division by zero when comparing against black.
```js
function contrast(colorA, colorB) {
let L1 = luminance(colorA);
let L2 = luminance(colorB);
return (L1 + 0.05) / (L2 + 0.05);
}
```
## Extending Culori
TODO
## See also
These libraries extend Culori:
* [culori-scales](https://github.com/danburzo/culori-scales) — color scales (ColorBrewer, matplotlib, etc.)
* [culori-names](https://github.com/danburzo/culori-names) — more color names
## Further reading
* [HSL and HSV](https://en.wikipedia.org/wiki/HSL_and_HSV) on Wikipedia
* [CSS Color Module Level 4][css4-colors]
* [CSSOM standard serialization](https://drafts.csswg.org/cssom/#serialize-a-css-component-value)
## Colophon
* _Author_ [Dan Burzo](http://danburzo.ro)
* _License_ [MIT](./LICENSE)
* _Inspired by_ [d3-color](https://github.com/d3/d3-color), [d3-interpolate](https://github.com/d3/d3-interpolate), [chroma.js](https://github.com/gka/chroma.js)
* _Dependencies_ none
* _Bundled with_ [rollup](https://github.com/rollup/rollup), [buble](https://github.com/Rich-Harris/buble)
* _Tested with_ [tape](https://github.com/substack/tape)
[css4-colors]: https://drafts.csswg.org/css-color/
[css4-named-colors]: https://drafts.csswg.org/css-color/#named-colors
[css4-named-colors]: https://drafts.csswg.org/css-color/#named-colors
[CIE76]: https://en.wikipedia.org/wiki/Color_difference#CIE76
[CIE94]: https://en.wikipedia.org/wiki/Color_difference#CIE94
[CIEDE2000]: https://en.wikipedia.org/wiki/Color_difference#CIEDE2000
[CMC]: https://en.wikipedia.org/wiki/Color_difference#CMC_l:c_(1984)
[DIN99o]: https://de.wikipedia.org/wiki/DIN99-Farbraum
[DIN99oDE]: https://de.wikipedia.org/wiki/DIN99-Farbraum#Farbabstandsformel
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