389 lines
8 KiB
JavaScript
389 lines
8 KiB
JavaScript
;(function(root, factory) {
|
|
|
|
// Support AMD
|
|
if (typeof define === 'function' && define.amd) {
|
|
define([], factory);
|
|
|
|
// Support CommonJS
|
|
} else if (typeof exports === 'object') {
|
|
var randomColor = factory();
|
|
|
|
// Support NodeJS & Component, which allow module.exports to be a function
|
|
if (typeof module === 'object' && module && module.exports) {
|
|
exports = module.exports = randomColor;
|
|
}
|
|
|
|
// Support CommonJS 1.1.1 spec
|
|
exports.randomColor = randomColor;
|
|
|
|
// Support vanilla script loading
|
|
} else {
|
|
root.randomColor = factory();
|
|
};
|
|
|
|
}(this, function() {
|
|
|
|
// Seed to get repeatable colors
|
|
var seed = null;
|
|
|
|
// Shared color dictionary
|
|
var colorDictionary = {};
|
|
|
|
// Populate the color dictionary
|
|
loadColorBounds();
|
|
|
|
var randomColor = function(options) {
|
|
if (options.seed && !seed) seed = options.seed;
|
|
options = options || {};
|
|
|
|
var H,S,B;
|
|
|
|
// Check if we need to generate multiple colors
|
|
if (options.count != null) {
|
|
|
|
var totalColors = options.count,
|
|
colors = [];
|
|
|
|
options.count = null;
|
|
|
|
while (totalColors > colors.length) {
|
|
colors.push(randomColor(options));
|
|
}
|
|
|
|
options.count = totalColors;
|
|
|
|
//Keep the seed constant between runs.
|
|
if (options.seed) seed = options.seed;
|
|
|
|
return colors;
|
|
}
|
|
|
|
// First we pick a hue (H)
|
|
H = pickHue(options);
|
|
|
|
// Then use H to determine saturation (S)
|
|
S = pickSaturation(H, options);
|
|
|
|
// Then use S and H to determine brightness (B).
|
|
B = pickBrightness(H, S, options);
|
|
|
|
// Then we return the HSB color in the desired format
|
|
return setFormat([H,S,B], options);
|
|
};
|
|
|
|
function pickHue (options) {
|
|
|
|
var hueRange = getHueRange(options.hue),
|
|
hue = randomWithin(hueRange);
|
|
|
|
// Instead of storing red as two seperate ranges,
|
|
// we group them, using negative numbers
|
|
if (hue < 0) {hue = 360 + hue}
|
|
|
|
return hue;
|
|
|
|
}
|
|
|
|
function pickSaturation (hue, options) {
|
|
|
|
if (options.luminosity === 'random') {
|
|
return randomWithin([0,100]);
|
|
}
|
|
|
|
if (options.hue === 'monochrome') {
|
|
return 0;
|
|
}
|
|
|
|
var saturationRange = getSaturationRange(hue);
|
|
|
|
var sMin = saturationRange[0],
|
|
sMax = saturationRange[1];
|
|
|
|
switch (options.luminosity) {
|
|
|
|
case 'bright':
|
|
sMin = 55;
|
|
break;
|
|
|
|
case 'dark':
|
|
sMin = sMax - 10;
|
|
break;
|
|
|
|
case 'light':
|
|
sMax = 55;
|
|
break;
|
|
}
|
|
|
|
return randomWithin([sMin, sMax]);
|
|
|
|
}
|
|
|
|
function pickBrightness (H, S, options) {
|
|
|
|
var brightness,
|
|
bMin = getMinimumBrightness(H, S),
|
|
bMax = 100;
|
|
|
|
switch (options.luminosity) {
|
|
|
|
case 'dark':
|
|
bMax = bMin + 20;
|
|
break;
|
|
|
|
case 'light':
|
|
bMin = (bMax + bMin)/2;
|
|
break;
|
|
|
|
case 'random':
|
|
bMin = 0;
|
|
bMax = 100;
|
|
break;
|
|
}
|
|
|
|
return randomWithin([bMin, bMax]);
|
|
|
|
}
|
|
|
|
function setFormat (hsv, options) {
|
|
|
|
switch (options.format) {
|
|
|
|
case 'hsvArray':
|
|
return hsv;
|
|
|
|
case 'hslArray':
|
|
return HSVtoHSL(hsv);
|
|
|
|
case 'hsl':
|
|
var hsl = HSVtoHSL(hsv);
|
|
return 'hsl('+hsl[0]+', '+hsl[1]+'%, '+hsl[2]+'%)';
|
|
|
|
case 'rgbArray':
|
|
return HSVtoRGB(hsv);
|
|
|
|
case 'rgb':
|
|
var rgb = HSVtoRGB(hsv);
|
|
return 'rgb(' + rgb.join(', ') + ')';
|
|
|
|
default:
|
|
return HSVtoHex(hsv);
|
|
}
|
|
|
|
}
|
|
|
|
function getMinimumBrightness(H, S) {
|
|
|
|
var lowerBounds = getColorInfo(H).lowerBounds;
|
|
|
|
for (var i = 0; i < lowerBounds.length - 1; i++) {
|
|
|
|
var s1 = lowerBounds[i][0],
|
|
v1 = lowerBounds[i][1];
|
|
|
|
var s2 = lowerBounds[i+1][0],
|
|
v2 = lowerBounds[i+1][1];
|
|
|
|
if (S >= s1 && S <= s2) {
|
|
|
|
var m = (v2 - v1)/(s2 - s1),
|
|
b = v1 - m*s1;
|
|
|
|
return m*S + b;
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
function getHueRange (colorInput) {
|
|
|
|
if (typeof parseInt(colorInput) === 'number') {
|
|
|
|
var number = parseInt(colorInput);
|
|
|
|
if (number < 360 && number > 0) {
|
|
return [number, number];
|
|
}
|
|
|
|
}
|
|
|
|
if (typeof colorInput === 'string') {
|
|
|
|
if (colorDictionary[colorInput]) {
|
|
var color = colorDictionary[colorInput];
|
|
if (color.hueRange) {return color.hueRange}
|
|
}
|
|
}
|
|
|
|
return [0,360];
|
|
|
|
}
|
|
|
|
function getSaturationRange (hue) {
|
|
return getColorInfo(hue).saturationRange;
|
|
}
|
|
|
|
function getColorInfo (hue) {
|
|
|
|
// Maps red colors to make picking hue easier
|
|
if (hue >= 334 && hue <= 360) {
|
|
hue-= 360;
|
|
}
|
|
|
|
for (var colorName in colorDictionary) {
|
|
var color = colorDictionary[colorName];
|
|
if (color.hueRange &&
|
|
hue >= color.hueRange[0] &&
|
|
hue <= color.hueRange[1]) {
|
|
return colorDictionary[colorName];
|
|
}
|
|
} return 'Color not found';
|
|
}
|
|
|
|
function randomWithin (range) {
|
|
if (seed == null) {
|
|
return Math.floor(range[0] + Math.random()*(range[1] + 1 - range[0]));
|
|
} else {
|
|
//Seeded random algorithm from http://indiegamr.com/generate-repeatable-random-numbers-in-js/
|
|
var max = range[1] || 1;
|
|
var min = range[0] || 0;
|
|
seed = (seed * 9301 + 49297) % 233280;
|
|
var rnd = seed / 233280.0;
|
|
return Math.floor(min + rnd * (max - min));
|
|
}
|
|
}
|
|
|
|
function HSVtoHex (hsv){
|
|
|
|
var rgb = HSVtoRGB(hsv);
|
|
|
|
function componentToHex(c) {
|
|
var hex = c.toString(16);
|
|
return hex.length == 1 ? "0" + hex : hex;
|
|
}
|
|
|
|
var hex = "#" + componentToHex(rgb[0]) + componentToHex(rgb[1]) + componentToHex(rgb[2]);
|
|
|
|
return hex;
|
|
|
|
}
|
|
|
|
function defineColor (name, hueRange, lowerBounds) {
|
|
|
|
var sMin = lowerBounds[0][0],
|
|
sMax = lowerBounds[lowerBounds.length - 1][0],
|
|
|
|
bMin = lowerBounds[lowerBounds.length - 1][1],
|
|
bMax = lowerBounds[0][1];
|
|
|
|
colorDictionary[name] = {
|
|
hueRange: hueRange,
|
|
lowerBounds: lowerBounds,
|
|
saturationRange: [sMin, sMax],
|
|
brightnessRange: [bMin, bMax]
|
|
};
|
|
|
|
}
|
|
|
|
function loadColorBounds () {
|
|
|
|
defineColor(
|
|
'monochrome',
|
|
null,
|
|
[[0,0],[100,0]]
|
|
);
|
|
|
|
defineColor(
|
|
'red',
|
|
[-26,18],
|
|
[[20,100],[30,92],[40,89],[50,85],[60,78],[70,70],[80,60],[90,55],[100,50]]
|
|
);
|
|
|
|
defineColor(
|
|
'orange',
|
|
[19,46],
|
|
[[20,100],[30,93],[40,88],[50,86],[60,85],[70,70],[100,70]]
|
|
);
|
|
|
|
defineColor(
|
|
'yellow',
|
|
[47,62],
|
|
[[25,100],[40,94],[50,89],[60,86],[70,84],[80,82],[90,80],[100,75]]
|
|
);
|
|
|
|
defineColor(
|
|
'green',
|
|
[63,178],
|
|
[[30,100],[40,90],[50,85],[60,81],[70,74],[80,64],[90,50],[100,40]]
|
|
);
|
|
|
|
defineColor(
|
|
'blue',
|
|
[179, 257],
|
|
[[20,100],[30,86],[40,80],[50,74],[60,60],[70,52],[80,44],[90,39],[100,35]]
|
|
);
|
|
|
|
defineColor(
|
|
'purple',
|
|
[258, 282],
|
|
[[20,100],[30,87],[40,79],[50,70],[60,65],[70,59],[80,52],[90,45],[100,42]]
|
|
);
|
|
|
|
defineColor(
|
|
'pink',
|
|
[283, 334],
|
|
[[20,100],[30,90],[40,86],[60,84],[80,80],[90,75],[100,73]]
|
|
);
|
|
|
|
}
|
|
|
|
function HSVtoRGB (hsv) {
|
|
|
|
// this doesn't work for the values of 0 and 360
|
|
// here's the hacky fix
|
|
var h = hsv[0];
|
|
if (h === 0) {h = 1}
|
|
if (h === 360) {h = 359}
|
|
|
|
// Rebase the h,s,v values
|
|
h = h/360;
|
|
var s = hsv[1]/100,
|
|
v = hsv[2]/100;
|
|
|
|
var h_i = Math.floor(h*6),
|
|
f = h * 6 - h_i,
|
|
p = v * (1 - s),
|
|
q = v * (1 - f*s),
|
|
t = v * (1 - (1 - f)*s),
|
|
r = 256,
|
|
g = 256,
|
|
b = 256;
|
|
|
|
switch(h_i) {
|
|
case 0: r = v, g = t, b = p; break;
|
|
case 1: r = q, g = v, b = p; break;
|
|
case 2: r = p, g = v, b = t; break;
|
|
case 3: r = p, g = q, b = v; break;
|
|
case 4: r = t, g = p, b = v; break;
|
|
case 5: r = v, g = p, b = q; break;
|
|
}
|
|
var result = [Math.floor(r*255), Math.floor(g*255), Math.floor(b*255)];
|
|
return result;
|
|
}
|
|
|
|
function HSVtoHSL (hsv) {
|
|
var h = hsv[0],
|
|
s = hsv[1]/100,
|
|
v = hsv[2]/100,
|
|
k = (2-s)*v;
|
|
|
|
return [
|
|
h,
|
|
Math.round(s*v / (k<1 ? k : 2-k) * 10000) / 100,
|
|
k/2 * 100
|
|
];
|
|
}
|
|
|
|
return randomColor;
|
|
}));
|