710 lines
21 KiB
JavaScript
710 lines
21 KiB
JavaScript
;(function(window, undefined){
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"use strict"
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var _valueRanges = {
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rgb: {r: [0, 255], g: [0, 255], b: [0, 255]},
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hsv: {h: [0, 360], s: [0, 100], v: [0, 100]},
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hsl: {h: [0, 360], s: [0, 100], l: [0, 100]},
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cmy: {c: [0, 100], m: [0, 100], y: [0, 100]},
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cmyk: {c: [0, 100], m: [0, 100], y: [0, 100], k: [0, 100]},
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Lab: {L: [0, 100], a: [-128, 127], b: [-128, 127]},
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XYZ: {X: [0, 100], Y: [0, 100], Z: [0, 100]},
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alpha: {alpha: [0, 1]},
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HEX: {HEX: [0, 16777215]} // maybe we don't need this
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},
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_instance = {},
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_colors = {},
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// http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html for more
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XYZMatrix = { // Observer = 2° (CIE 1931), Illuminant = D65
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X: [ 0.4124564, 0.3575761, 0.1804375],
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Y: [ 0.2126729, 0.7151522, 0.0721750],
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Z: [ 0.0193339, 0.1191920, 0.9503041],
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R: [ 3.2404542, -1.5371385, -0.4985314],
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G: [-0.9692660, 1.8760108, 0.0415560],
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B: [ 0.0556434, -0.2040259, 1.0572252]
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},
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grey = {r: 0.298954, g: 0.586434, b: 0.114612}, // CIE-XYZ 1931
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luminance = {r: 0.2126, g: 0.7152, b: 0.0722}, // W3C 2.0
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_math = Math,
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_parseint = parseInt,
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Colors = window.Colors = function(options) {
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this.colors = {RND: {}};
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this.options = {
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color: 'rgba(204, 82, 37, 0.8)', // init value(s)...
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XYZMatrix: XYZMatrix,
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// XYZReference: {},
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grey: grey,
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luminance: luminance,
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valueRanges: _valueRanges
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// customBG: '#808080'
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// convertCallback: undefined,
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// allMixDetails: false
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};
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initInstance(this, options || {});
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},
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initInstance = function(THIS, options) {
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var matrix,
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importColor,
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_options = THIS.options,
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customBG;
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focusInstance(THIS);
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for (var option in options) {
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if (options[option] !== undefined) _options[option] = options[option];
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}
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matrix = _options.XYZMatrix;
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if (!options.XYZReference) _options.XYZReference = {
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X: matrix.X[0] + matrix.X[1] + matrix.X[2],
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Y: matrix.Y[0] + matrix.Y[1] + matrix.Y[2],
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Z: matrix.Z[0] + matrix.Z[1] + matrix.Z[2]
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};
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customBG = _options.customBG;
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_options.customBG = (typeof customBG === 'string') ? ColorConverter.txt2color(customBG).rgb : customBG;
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_colors = setColor(THIS.colors, _options.color, undefined, true); // THIS.colors = _colors =
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},
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focusInstance = function(THIS) {
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if (_instance !== THIS) {
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_instance = THIS;
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_colors = THIS.colors;
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}
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};
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Colors.prototype.setColor = function(newCol, type, alpha) {
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focusInstance(this);
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if (newCol) {
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return setColor(this.colors, newCol, type, undefined, alpha);
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} else {
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if (alpha !== undefined) {
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this.colors.alpha = limitValue(alpha, 0, 1);
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}
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return convertColors(type);
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}
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};
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Colors.prototype.getColor = function(type) {
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var result = this.colors, n = 0;
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if (type) {
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type = type.split('.');
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while (result[type[n]]) {
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result = result[type[n++]];
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}
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if (type.length !== n) {
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result = undefined;
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}
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}
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return result;
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};
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Colors.prototype.setCustomBackground = function(col) { // wild gues,... check again...
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focusInstance(this); // needed???
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this.options.customBG = (typeof col === 'string') ? ColorConverter.txt2color(col).rgb : col;
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// return setColor(this.colors, this.options.customBG, 'rgb', true); // !!!!RGB
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return setColor(this.colors, undefined, 'rgb'); // just recalculate existing
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};
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Colors.prototype.saveAsBackground = function() { // alpha
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focusInstance(this); // needed???
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// return setColor(this.colors, this.colors.RND.rgb, 'rgb', true);
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return setColor(this.colors, undefined, 'rgb', true);
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};
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Colors.prototype.convertColor = function(color, type) {
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var convert = ColorConverter,
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ranges = _valueRanges,
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types = type.split('2'),
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fromType = types[0],
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toType = types[1],
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test = /(?:RG|HS|CM|LA)/,
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normalizeFrom = test.test(fromType),
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normalizeTo = test.test(toType),
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exceptions = {LAB: 'Lab'},
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normalize = function(color, type, reverse) {
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var result = {},
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Lab = type === 'Lab' ? 1 : 0;
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for (var n in color) { // faster (but bigger) way: if/else outside 2 for loops
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result[n] = reverse ?
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_math.round(color[n] * (Lab || ranges[type][n][1])) :
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color[n] / (Lab || ranges[type][n][1]);
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}
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return result;
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};
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fromType = ranges[fromType] ? fromType : exceptions[fromType] || fromType.toLowerCase();
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toType = ranges[toType] ? toType : exceptions[toType] || toType.toLowerCase();
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if (normalizeFrom && type !== 'RGB2HEX') { // from ABC to abc
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color = normalize(color, fromType);
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}
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color = fromType === toType ? color : ( // same type; returns same/normalized version
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convert[fromType + '2' + toType] ? convert[fromType + '2' + toType](color, true) : // existing converter
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toType === 'HEX' ? convert.RGB2HEX(type === 'RGB2HEX' ? color : normalize(fromType === 'rgb' ? color :
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convert[fromType + '2rgb'](color, true), 'rgb', true)) :
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convert['rgb2' + toType](convert[fromType + '2rgb'](color, true), true) // not in ColorConverter
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);
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if (normalizeTo) { // from abc to ABC
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color = normalize(color, toType, true);
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}
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return color;
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};
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// ------------------------------------------------------ //
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// ---------- Color calculation related stuff ---------- //
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// -------------------------------------------------------//
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function setColor(colors, color, type, save, alpha) { // color only full range
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if (typeof color === 'string') {
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var color = ColorConverter.txt2color(color); // new object
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type = color.type;
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_colors[type] = color[type];
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alpha = alpha !== undefined ? alpha : color.alpha;
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} else if (color) {
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for (var n in color) {
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colors[type][n] = limitValue(color[n] / _valueRanges[type][n][1], 0 , 1);
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}
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}
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if (alpha !== undefined) {
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colors.alpha = limitValue(+alpha, 0, 1);
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}
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return convertColors(type, save ? colors : undefined);
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}
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function saveAsBackground(RGB, rgb, alpha) {
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var grey = _instance.options.grey,
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color = {};
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color.RGB = {r: RGB.r, g: RGB.g, b: RGB.b};
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color.rgb = {r: rgb.r, g: rgb.g, b: rgb.b};
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color.alpha = alpha;
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// color.RGBLuminance = getLuminance(RGB);
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color.equivalentGrey = _math.round(grey.r * RGB.r + grey.g * RGB.g + grey.b * RGB.b);
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color.rgbaMixBlack = mixColors(rgb, {r: 0, g: 0, b: 0}, alpha, 1);
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color.rgbaMixWhite = mixColors(rgb, {r: 1, g: 1, b: 1}, alpha, 1);
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color.rgbaMixBlack.luminance = getLuminance(color.rgbaMixBlack, true);
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color.rgbaMixWhite.luminance = getLuminance(color.rgbaMixWhite, true);
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if (_instance.options.customBG) {
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color.rgbaMixCustom = mixColors(rgb, _instance.options.customBG, alpha, 1);
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color.rgbaMixCustom.luminance = getLuminance(color.rgbaMixCustom, true);
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_instance.options.customBG.luminance = getLuminance(_instance.options.customBG, true);
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}
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return color;
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}
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function convertColors(type, colorObj) {
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// console.time('convertColors');
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var _Math = _math,
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colors = colorObj || _colors,
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convert = ColorConverter,
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options = _instance.options,
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ranges = _valueRanges,
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RND = colors.RND,
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// type = colorType, // || _mode.type,
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modes, mode = '', from = '', // value = '',
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exceptions = {hsl: 'hsv', cmyk: 'cmy', rgb: type},
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RGB = RND.rgb, SAVE, SMART;
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if (type !== 'alpha') {
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for (var typ in ranges) {
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if (!ranges[typ][typ]) { // no alpha|HEX
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if (type !== typ && typ !== 'XYZ') {
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from = exceptions[typ] || 'rgb';
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colors[typ] = convert[from + '2' + typ](colors[from]);
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}
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if (!RND[typ]) RND[typ] = {};
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modes = colors[typ];
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for(mode in modes) {
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RND[typ][mode] = _Math.round(modes[mode] * (typ === 'Lab' ? 1 : ranges[typ][mode][1]));
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}
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}
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}
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if (type !== 'Lab') {
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delete colors._rgb;
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}
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RGB = RND.rgb;
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colors.HEX = convert.RGB2HEX(RGB);
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colors.equivalentGrey =
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options.grey.r * colors.rgb.r +
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options.grey.g * colors.rgb.g +
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options.grey.b * colors.rgb.b;
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colors.webSave = SAVE = getClosestWebColor(RGB, 51);
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// colors.webSave.HEX = convert.RGB2HEX(colors.webSave);
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colors.webSmart = SMART = getClosestWebColor(RGB, 17);
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// colors.webSmart.HEX = convert.RGB2HEX(colors.webSmart);
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colors.saveColor =
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RGB.r === SAVE.r && RGB.g === SAVE.g && RGB.b === SAVE.b ? 'web save' :
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RGB.r === SMART.r && RGB.g === SMART.g && RGB.b === SMART.b ? 'web smart' : '';
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colors.hueRGB = convert.hue2RGB(colors.hsv.h);
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if (colorObj) {
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colors.background = saveAsBackground(RGB, colors.rgb, colors.alpha);
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}
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} // else RGB = RND.rgb;
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var rgb = colors.rgb, // for better minification...
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alpha = colors.alpha,
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luminance = 'luminance',
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background = colors.background,
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rgbaMixBlack, rgbaMixWhite, rgbaMixCustom,
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rgbaMixBG, rgbaMixBGMixBlack, rgbaMixBGMixWhite, rgbaMixBGMixCustom,
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_mixColors = mixColors,
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_getLuminance = getLuminance,
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_getWCAG2Ratio = getWCAG2Ratio,
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_getHueDelta = getHueDelta;
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rgbaMixBlack = _mixColors(rgb, {r: 0, g: 0, b: 0}, alpha, 1);
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rgbaMixBlack[luminance] = _getLuminance(rgbaMixBlack, true);
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colors.rgbaMixBlack = rgbaMixBlack;
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rgbaMixWhite = _mixColors(rgb, {r: 1, g: 1, b: 1}, alpha, 1);
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rgbaMixWhite[luminance] = _getLuminance(rgbaMixWhite, true);
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colors.rgbaMixWhite = rgbaMixWhite;
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if (options.allMixDetails) {
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rgbaMixBlack.WCAG2Ratio = _getWCAG2Ratio(rgbaMixBlack[luminance], 0);
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rgbaMixWhite.WCAG2Ratio = _getWCAG2Ratio(rgbaMixWhite[luminance], 1);
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if (options.customBG) {
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rgbaMixCustom = _mixColors(rgb, options.customBG, alpha, 1);
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rgbaMixCustom[luminance] = _getLuminance(rgbaMixCustom, true);
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rgbaMixCustom.WCAG2Ratio = _getWCAG2Ratio(rgbaMixCustom[luminance], options.customBG[luminance]);
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colors.rgbaMixCustom = rgbaMixCustom;
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}
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rgbaMixBG = _mixColors(rgb, background.rgb, alpha, background.alpha);
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rgbaMixBG[luminance] = _getLuminance(rgbaMixBG, true); // ?? do we need this?
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colors.rgbaMixBG = rgbaMixBG;
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rgbaMixBGMixBlack = _mixColors(rgb, background.rgbaMixBlack, alpha, 1);
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rgbaMixBGMixBlack[luminance] = _getLuminance(rgbaMixBGMixBlack, true);
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rgbaMixBGMixBlack.WCAG2Ratio = _getWCAG2Ratio(rgbaMixBGMixBlack[luminance],
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background.rgbaMixBlack[luminance]);
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/* ------ */
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rgbaMixBGMixBlack.luminanceDelta = _Math.abs(
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rgbaMixBGMixBlack[luminance] - background.rgbaMixBlack[luminance]);
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rgbaMixBGMixBlack.hueDelta = _getHueDelta(background.rgbaMixBlack, rgbaMixBGMixBlack, true);
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/* ------ */
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colors.rgbaMixBGMixBlack = rgbaMixBGMixBlack;
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rgbaMixBGMixWhite = _mixColors(rgb, background.rgbaMixWhite, alpha, 1);
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rgbaMixBGMixWhite[luminance] = _getLuminance(rgbaMixBGMixWhite, true);
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rgbaMixBGMixWhite.WCAG2Ratio = _getWCAG2Ratio(rgbaMixBGMixWhite[luminance],
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background.rgbaMixWhite[luminance]);
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/* ------ */
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rgbaMixBGMixWhite.luminanceDelta = _Math.abs(
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rgbaMixBGMixWhite[luminance] - background.rgbaMixWhite[luminance]);
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rgbaMixBGMixWhite.hueDelta = _getHueDelta(background.rgbaMixWhite, rgbaMixBGMixWhite, true);
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/* ------ */
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colors.rgbaMixBGMixWhite = rgbaMixBGMixWhite;
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}
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if (options.customBG) {
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rgbaMixBGMixCustom = _mixColors(rgb, background.rgbaMixCustom, alpha, 1);
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rgbaMixBGMixCustom[luminance] = _getLuminance(rgbaMixBGMixCustom, true);
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rgbaMixBGMixCustom.WCAG2Ratio = _getWCAG2Ratio(rgbaMixBGMixCustom[luminance],
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background.rgbaMixCustom[luminance]);
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colors.rgbaMixBGMixCustom = rgbaMixBGMixCustom;
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/* ------ */
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rgbaMixBGMixCustom.luminanceDelta = _Math.abs(
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rgbaMixBGMixCustom[luminance] - background.rgbaMixCustom[luminance]);
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rgbaMixBGMixCustom.hueDelta = _getHueDelta(background.rgbaMixCustom, rgbaMixBGMixCustom, true);
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/* ------ */
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}
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colors.RGBLuminance = _getLuminance(RGB);
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colors.HUELuminance = _getLuminance(colors.hueRGB);
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// renderVars.readyToRender = true;
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if (options.convertCallback) {
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options.convertCallback(colors, type); //, convert); //, _mode);
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}
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// console.timeEnd('convertColors')
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// if (colorObj)
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return colors;
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}
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// ------------------------------------------------------ //
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// ------------------ color conversion ------------------ //
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// -------------------------------------------------------//
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var ColorConverter = {
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txt2color: function(txt) {
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var color = {},
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parts = txt.replace(/(?:#|\)|%)/g, '').split('('),
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values = (parts[1] || '').split(/,\s*/),
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type = parts[1] ? parts[0].substr(0, 3) : 'rgb',
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m = '';
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color.type = type;
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color[type] = {};
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if (parts[1]) {
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for (var n = 3; n--; ) {
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m = type[n] || type.charAt(n); // IE7
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color[type][m] = +values[n] / _valueRanges[type][m][1];
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}
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} else {
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color.rgb = ColorConverter.HEX2rgb(parts[0]);
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}
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// color.color = color[type];
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color.alpha = values[3] ? +values[3] : 1;
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return color;
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},
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RGB2HEX: function(RGB) {
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return (
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(RGB.r < 16 ? '0' : '') + RGB.r.toString(16) +
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(RGB.g < 16 ? '0' : '') + RGB.g.toString(16) +
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(RGB.b < 16 ? '0' : '') + RGB.b.toString(16)
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).toUpperCase();
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},
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HEX2rgb: function(HEX) {
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var _parseInt = _parseint;
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HEX = HEX.split(''); // IE7
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return {
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r: _parseInt(HEX[0] + HEX[HEX[3] ? 1 : 0], 16) / 255,
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g: _parseInt(HEX[HEX[3] ? 2 : 1] + (HEX[3] || HEX[1]), 16) / 255,
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b: _parseInt((HEX[4] || HEX[2]) + (HEX[5] || HEX[2]), 16) / 255
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};
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},
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hue2RGB: function(hue) {
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var _Math = _math,
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h = hue * 6,
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mod = ~~h % 6, // Math.floor(h) -> faster in most browsers
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i = h === 6 ? 0 : (h - mod);
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return {
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r: _Math.round([1, 1 - i, 0, 0, i, 1][mod] * 255),
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g: _Math.round([i, 1, 1, 1 - i, 0, 0][mod] * 255),
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b: _Math.round([0, 0, i, 1, 1, 1 - i][mod] * 255)
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};
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},
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// ------------------------ HSV ------------------------ //
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rgb2hsv: function(rgb) { // faster
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var _Math = _math,
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r = rgb.r,
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g = rgb.g,
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b = rgb.b,
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k = 0, chroma, min, s;
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if (g < b) {
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g = b + (b = g, 0);
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k = -1;
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}
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min = b;
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if (r < g) {
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r = g + (g = r, 0);
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k = -2 / 6 - k;
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min = _Math.min(g, b); // g < b ? g : b; ???
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}
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chroma = r - min;
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s = r ? (chroma / r) : 0;
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return {
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h: s < 1e-15 ? ((_colors && _colors.hsl && _colors.hsl.h) || 0) :
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chroma ? _Math.abs(k + (g - b) / (6 * chroma)) : 0,
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s: r ? (chroma / r) : ((_colors && _colors.hsv && _colors.hsv.s) || 0), // ??_colors.hsv.s || 0
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v: r
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};
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},
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hsv2rgb: function(hsv) {
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var h = hsv.h * 6,
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s = hsv.s,
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v = hsv.v,
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i = ~~h, // Math.floor(h) -> faster in most browsers
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f = h - i,
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p = v * (1 - s),
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q = v * (1 - f * s),
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t = v * (1 - (1 - f) * s),
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mod = i % 6;
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return {
|
||
r: [v, q, p, p, t, v][mod],
|
||
g: [t, v, v, q, p, p][mod],
|
||
b: [p, p, t, v, v, q][mod]
|
||
};
|
||
},
|
||
|
||
// ------------------------ HSL ------------------------ //
|
||
|
||
hsv2hsl: function(hsv) {
|
||
var l = (2 - hsv.s) * hsv.v,
|
||
s = hsv.s * hsv.v;
|
||
|
||
s = !hsv.s ? 0 : l < 1 ? (l ? s / l : 0) : s / (2 - l);
|
||
|
||
return {
|
||
h: hsv.h,
|
||
s: !hsv.v && !s ? ((_colors && _colors.hsl && _colors.hsl.s) || 0) : s, // ???
|
||
l: l / 2
|
||
};
|
||
},
|
||
|
||
rgb2hsl: function(rgb, dependent) { // not used in Color
|
||
var hsv = ColorConverter.rgb2hsv(rgb);
|
||
|
||
return ColorConverter.hsv2hsl(dependent ? hsv : (_colors.hsv = hsv));
|
||
},
|
||
|
||
hsl2rgb: function(hsl) {
|
||
var h = hsl.h * 6,
|
||
s = hsl.s,
|
||
l = hsl.l,
|
||
v = l < 0.5 ? l * (1 + s) : (l + s) - (s * l),
|
||
m = l + l - v,
|
||
sv = v ? ((v - m) / v) : 0,
|
||
sextant = ~~h, // Math.floor(h) -> faster in most browsers
|
||
fract = h - sextant,
|
||
vsf = v * sv * fract,
|
||
t = m + vsf,
|
||
q = v - vsf,
|
||
mod = sextant % 6;
|
||
|
||
return {
|
||
r: [v, q, m, m, t, v][mod],
|
||
g: [t, v, v, q, m, m][mod],
|
||
b: [m, m, t, v, v, q][mod]
|
||
};
|
||
},
|
||
|
||
// ------------------------ CMYK ------------------------ //
|
||
// Quote from Wikipedia:
|
||
// "Since RGB and CMYK spaces are both device-dependent spaces, there is no
|
||
// simple or general conversion formula that converts between them.
|
||
// Conversions are generally done through color management systems, using
|
||
// color profiles that describe the spaces being converted. Nevertheless, the
|
||
// conversions cannot be exact, since these spaces have very different gamuts."
|
||
// Translation: the following are just simple RGB to CMY(K) and visa versa conversion functions.
|
||
|
||
rgb2cmy: function(rgb) {
|
||
return {
|
||
c: 1 - rgb.r,
|
||
m: 1 - rgb.g,
|
||
y: 1 - rgb.b
|
||
};
|
||
},
|
||
|
||
cmy2cmyk: function(cmy) {
|
||
var _Math = _math,
|
||
k = _Math.min(_Math.min(cmy.c, cmy.m), cmy.y),
|
||
t = 1 - k || 1e-20;
|
||
|
||
return { // regular
|
||
c: (cmy.c - k) / t,
|
||
m: (cmy.m - k) / t,
|
||
y: (cmy.y - k) / t,
|
||
k: k
|
||
};
|
||
},
|
||
|
||
cmyk2cmy: function(cmyk) {
|
||
var k = cmyk.k;
|
||
|
||
return { // regular
|
||
c: cmyk.c * (1 - k) + k,
|
||
m: cmyk.m * (1 - k) + k,
|
||
y: cmyk.y * (1 - k) + k
|
||
};
|
||
},
|
||
|
||
cmy2rgb: function(cmy) {
|
||
return {
|
||
r: 1 - cmy.c,
|
||
g: 1 - cmy.m,
|
||
b: 1 - cmy.y
|
||
};
|
||
},
|
||
|
||
rgb2cmyk: function(rgb, dependent) {
|
||
var cmy = ColorConverter.rgb2cmy(rgb); // doppelt??
|
||
|
||
return ColorConverter.cmy2cmyk(dependent ? cmy : (_colors.cmy = cmy));
|
||
},
|
||
|
||
cmyk2rgb: function(cmyk, dependent) {
|
||
var cmy = ColorConverter.cmyk2cmy(cmyk); // doppelt??
|
||
|
||
return ColorConverter.cmy2rgb(dependent ? cmy : (_colors.cmy = cmy));
|
||
},
|
||
|
||
// ------------------------ LAB ------------------------ //
|
||
|
||
XYZ2rgb: function(XYZ, skip) {
|
||
var _Math = _math,
|
||
M = _instance.options.XYZMatrix,
|
||
X = XYZ.X,
|
||
Y = XYZ.Y,
|
||
Z = XYZ.Z,
|
||
r = X * M.R[0] + Y * M.R[1] + Z * M.R[2],
|
||
g = X * M.G[0] + Y * M.G[1] + Z * M.G[2],
|
||
b = X * M.B[0] + Y * M.B[1] + Z * M.B[2],
|
||
N = 1 / 2.4;
|
||
|
||
M = 0.0031308;
|
||
|
||
r = (r > M ? 1.055 * _Math.pow(r, N) - 0.055 : 12.92 * r);
|
||
g = (g > M ? 1.055 * _Math.pow(g, N) - 0.055 : 12.92 * g);
|
||
b = (b > M ? 1.055 * _Math.pow(b, N) - 0.055 : 12.92 * b);
|
||
|
||
if (!skip) { // out of gammut
|
||
_colors._rgb = {r: r, g: g, b: b};
|
||
}
|
||
|
||
return {
|
||
r: limitValue(r, 0, 1),
|
||
g: limitValue(g, 0, 1),
|
||
b: limitValue(b, 0, 1)
|
||
};
|
||
},
|
||
|
||
rgb2XYZ: function(rgb) {
|
||
var _Math = _math,
|
||
M = _instance.options.XYZMatrix,
|
||
r = rgb.r,
|
||
g = rgb.g,
|
||
b = rgb.b,
|
||
N = 0.04045;
|
||
|
||
r = (r > N ? _Math.pow((r + 0.055) / 1.055, 2.4) : r / 12.92);
|
||
g = (g > N ? _Math.pow((g + 0.055) / 1.055, 2.4) : g / 12.92);
|
||
b = (b > N ? _Math.pow((b + 0.055) / 1.055, 2.4) : b / 12.92);
|
||
|
||
return {
|
||
X: r * M.X[0] + g * M.X[1] + b * M.X[2],
|
||
Y: r * M.Y[0] + g * M.Y[1] + b * M.Y[2],
|
||
Z: r * M.Z[0] + g * M.Z[1] + b * M.Z[2]
|
||
};
|
||
},
|
||
|
||
XYZ2Lab: function(XYZ) {
|
||
var _Math = _math,
|
||
R = _instance.options.XYZReference,
|
||
X = XYZ.X / R.X,
|
||
Y = XYZ.Y / R.Y,
|
||
Z = XYZ.Z / R.Z,
|
||
N = 16 / 116, M = 1 / 3, K = 0.008856, L = 7.787037;
|
||
|
||
X = X > K ? _Math.pow(X, M) : (L * X) + N;
|
||
Y = Y > K ? _Math.pow(Y, M) : (L * Y) + N;
|
||
Z = Z > K ? _Math.pow(Z, M) : (L * Z) + N;
|
||
|
||
return {
|
||
L: (116 * Y) - 16,
|
||
a: 500 * (X - Y),
|
||
b: 200 * (Y - Z)
|
||
};
|
||
},
|
||
|
||
Lab2XYZ: function(Lab) {
|
||
var _Math = _math,
|
||
R = _instance.options.XYZReference,
|
||
Y = (Lab.L + 16) / 116,
|
||
X = Lab.a / 500 + Y,
|
||
Z = Y - Lab.b / 200,
|
||
X3 = _Math.pow(X, 3),
|
||
Y3 = _Math.pow(Y, 3),
|
||
Z3 = _Math.pow(Z, 3),
|
||
N = 16 / 116, K = 0.008856, L = 7.787037;
|
||
|
||
return {
|
||
X: (X3 > K ? X3 : (X - N) / L) * R.X,
|
||
Y: (Y3 > K ? Y3 : (Y - N) / L) * R.Y,
|
||
Z: (Z3 > K ? Z3 : (Z - N) / L) * R.Z
|
||
};
|
||
},
|
||
|
||
rgb2Lab: function(rgb, dependent) {
|
||
var XYZ = ColorConverter.rgb2XYZ(rgb);
|
||
|
||
return ColorConverter.XYZ2Lab(dependent ? XYZ : (_colors.XYZ = XYZ));
|
||
},
|
||
|
||
Lab2rgb: function(Lab, dependent) {
|
||
var XYZ = ColorConverter.Lab2XYZ(Lab);
|
||
|
||
return ColorConverter.XYZ2rgb(dependent ? XYZ : (_colors.XYZ = XYZ), dependent);
|
||
}
|
||
};
|
||
|
||
// ------------------------------------------------------ //
|
||
// ------------------ helper functions ------------------ //
|
||
// -------------------------------------------------------//
|
||
|
||
function getClosestWebColor(RGB, val) {
|
||
var out = {},
|
||
tmp = 0,
|
||
half = val / 2;
|
||
|
||
for (var n in RGB) {
|
||
tmp = RGB[n] % val; // 51 = 'web save', 17 = 'web smart'
|
||
out[n] = RGB[n] + (tmp > half ? val - tmp : -tmp);
|
||
}
|
||
return out;
|
||
}
|
||
|
||
function getHueDelta(rgb1, rgb2, nominal) {
|
||
var _Math = _math;
|
||
|
||
return (_Math.max(rgb1.r - rgb2.r, rgb2.r - rgb1.r) +
|
||
_Math.max(rgb1.g - rgb2.g, rgb2.g - rgb1.g) +
|
||
_Math.max(rgb1.b - rgb2.b, rgb2.b - rgb1.b)) * (nominal ? 255 : 1) / 765;
|
||
}
|
||
|
||
function getLuminance(rgb, normalized) {
|
||
var div = normalized ? 1 : 255,
|
||
RGB = [rgb.r / div, rgb.g / div, rgb.b / div],
|
||
luminance = _instance.options.luminance;
|
||
|
||
for (var i = RGB.length; i--; ) {
|
||
RGB[i] = RGB[i] <= 0.03928 ? RGB[i] / 12.92 : _math.pow(((RGB[i] + 0.055) / 1.055), 2.4);
|
||
}
|
||
return ((luminance.r * RGB[0]) + (luminance.g * RGB[1]) + (luminance.b * RGB[2]));
|
||
}
|
||
|
||
function mixColors(topColor, bottomColor, topAlpha, bottomAlpha) {
|
||
var newColor = {},
|
||
alphaTop = (topAlpha !== undefined ? topAlpha : 1),
|
||
alphaBottom = (bottomAlpha !== undefined ? bottomAlpha : 1),
|
||
alpha = alphaTop + alphaBottom * (1 - alphaTop); // 1 - (1 - alphaTop) * (1 - alphaBottom);
|
||
|
||
for(var n in topColor) {
|
||
newColor[n] = (topColor[n] * alphaTop + bottomColor[n] * alphaBottom * (1 - alphaTop)) / alpha;
|
||
}
|
||
newColor.a = alpha;
|
||
return newColor;
|
||
}
|
||
|
||
function getWCAG2Ratio(lum1, lum2) {
|
||
var ratio = 1;
|
||
|
||
if (lum1 >= lum2) {
|
||
ratio = (lum1 + 0.05) / (lum2 + 0.05);
|
||
} else {
|
||
ratio = (lum2 + 0.05) / (lum1 + 0.05);
|
||
}
|
||
return _math.round(ratio * 100) / 100;
|
||
}
|
||
|
||
function limitValue(value, min, max) {
|
||
// return Math.max(min, Math.min(max, value)); // faster??
|
||
return (value > max ? max : value < min ? min : value);
|
||
}
|
||
})(window); |