const hsv2hsl = function(hue, sat, val) {
|
return [
|
hue,
|
(sat * val / ((hue = (2 - sat) * val) < 1 ? hue : 2 - hue)) || 0,
|
hue / 2
|
];
|
};
|
|
// Need to handle 1.0 as 100%, since once it is a number, there is no difference between it and 1
|
// <http://stackoverflow.com/questions/7422072/javascript-how-to-detect-number-as-a-decimal-including-1-0>
|
const isOnePointZero = function(n) {
|
return typeof n === 'string' && n.indexOf('.') !== -1 && parseFloat(n) === 1;
|
};
|
|
const isPercentage = function(n) {
|
return typeof n === 'string' && n.indexOf('%') !== -1;
|
};
|
|
// Take input from [0, n] and return it as [0, 1]
|
const bound01 = function(value, max) {
|
if (isOnePointZero(value)) value = '100%';
|
|
const processPercent = isPercentage(value);
|
value = Math.min(max, Math.max(0, parseFloat(value)));
|
|
// Automatically convert percentage into number
|
if (processPercent) {
|
value = parseInt(value * max, 10) / 100;
|
}
|
|
// Handle floating point rounding errors
|
if ((Math.abs(value - max) < 0.000001)) {
|
return 1;
|
}
|
|
// Convert into [0, 1] range if it isn't already
|
return (value % max) / parseFloat(max);
|
};
|
|
const INT_HEX_MAP = { 10: 'A', 11: 'B', 12: 'C', 13: 'D', 14: 'E', 15: 'F' };
|
|
const toHex = function({ r, g, b }) {
|
const hexOne = function(value) {
|
value = Math.min(Math.round(value), 255);
|
const high = Math.floor(value / 16);
|
const low = value % 16;
|
return '' + (INT_HEX_MAP[high] || high) + (INT_HEX_MAP[low] || low);
|
};
|
|
if (isNaN(r) || isNaN(g) || isNaN(b)) return '';
|
|
return '#' + hexOne(r) + hexOne(g) + hexOne(b);
|
};
|
|
const HEX_INT_MAP = { A: 10, B: 11, C: 12, D: 13, E: 14, F: 15 };
|
|
const parseHexChannel = function(hex) {
|
if (hex.length === 2) {
|
return (HEX_INT_MAP[hex[0].toUpperCase()] || +hex[0]) * 16 + (HEX_INT_MAP[hex[1].toUpperCase()] || +hex[1]);
|
}
|
|
return HEX_INT_MAP[hex[1].toUpperCase()] || +hex[1];
|
};
|
|
const hsl2hsv = function(hue, sat, light) {
|
sat = sat / 100;
|
light = light / 100;
|
let smin = sat;
|
const lmin = Math.max(light, 0.01);
|
let sv;
|
let v;
|
|
light *= 2;
|
sat *= (light <= 1) ? light : 2 - light;
|
smin *= lmin <= 1 ? lmin : 2 - lmin;
|
v = (light + sat) / 2;
|
sv = light === 0 ? (2 * smin) / (lmin + smin) : (2 * sat) / (light + sat);
|
|
return {
|
h: hue,
|
s: sv * 100,
|
v: v * 100
|
};
|
};
|
|
// `rgbToHsv`
|
// Converts an RGB color value to HSV
|
// *Assumes:* r, g, and b are contained in the set [0, 255] or [0, 1]
|
// *Returns:* { h, s, v } in [0,1]
|
const rgb2hsv = function(r, g, b) {
|
r = bound01(r, 255);
|
g = bound01(g, 255);
|
b = bound01(b, 255);
|
|
const max = Math.max(r, g, b);
|
const min = Math.min(r, g, b);
|
let h, s;
|
let v = max;
|
|
const d = max - min;
|
s = max === 0 ? 0 : d / max;
|
|
if (max === min) {
|
h = 0; // achromatic
|
} else {
|
switch (max) {
|
case r:
|
h = (g - b) / d + (g < b ? 6 : 0);
|
break;
|
case g:
|
h = (b - r) / d + 2;
|
break;
|
case b:
|
h = (r - g) / d + 4;
|
break;
|
}
|
h /= 6;
|
}
|
|
return { h: h * 360, s: s * 100, v: v * 100 };
|
};
|
|
// `hsvToRgb`
|
// Converts an HSV color value to RGB.
|
// *Assumes:* h is contained in [0, 1] or [0, 360] and s and v are contained in [0, 1] or [0, 100]
|
// *Returns:* { r, g, b } in the set [0, 255]
|
const hsv2rgb = function(h, s, v) {
|
h = bound01(h, 360) * 6;
|
s = bound01(s, 100);
|
v = bound01(v, 100);
|
|
const i = Math.floor(h);
|
const f = h - i;
|
const p = v * (1 - s);
|
const q = v * (1 - f * s);
|
const t = v * (1 - (1 - f) * s);
|
const mod = i % 6;
|
const r = [v, q, p, p, t, v][mod];
|
const g = [t, v, v, q, p, p][mod];
|
const b = [p, p, t, v, v, q][mod];
|
|
return {
|
r: Math.round(r * 255),
|
g: Math.round(g * 255),
|
b: Math.round(b * 255)
|
};
|
};
|
|
export default class Color {
|
constructor(options) {
|
this._hue = 0;
|
this._saturation = 100;
|
this._value = 100;
|
this._alpha = 100;
|
|
this.enableAlpha = false;
|
this.format = 'hex';
|
this.value = '';
|
|
options = options || {};
|
|
for (let option in options) {
|
if (options.hasOwnProperty(option)) {
|
this[option] = options[option];
|
}
|
}
|
|
this.doOnChange();
|
}
|
|
set(prop, value) {
|
if (arguments.length === 1 && typeof prop === 'object') {
|
for (let p in prop) {
|
if (prop.hasOwnProperty(p)) {
|
this.set(p, prop[p]);
|
}
|
}
|
|
return;
|
}
|
|
this['_' + prop] = value;
|
this.doOnChange();
|
}
|
|
get(prop) {
|
return this['_' + prop];
|
}
|
|
toRgb() {
|
return hsv2rgb(this._hue, this._saturation, this._value);
|
}
|
|
fromString(value) {
|
if (!value) {
|
this._hue = 0;
|
this._saturation = 100;
|
this._value = 100;
|
|
this.doOnChange();
|
return;
|
}
|
|
const fromHSV = (h, s, v) => {
|
this._hue = Math.max(0, Math.min(360, h));
|
this._saturation = Math.max(0, Math.min(100, s));
|
this._value = Math.max(0, Math.min(100, v));
|
|
this.doOnChange();
|
};
|
|
if (value.indexOf('hsl') !== -1) {
|
const parts = value.replace(/hsla|hsl|\(|\)/gm, '')
|
.split(/\s|,/g).filter((val) => val !== '').map((val, index) => index > 2 ? parseFloat(val) : parseInt(val, 10));
|
|
if (parts.length === 4) {
|
this._alpha = Math.floor(parseFloat(parts[3]) * 100);
|
} else if (parts.length === 3) {
|
this._alpha = 100;
|
}
|
if (parts.length >= 3) {
|
const { h, s, v } = hsl2hsv(parts[0], parts[1], parts[2]);
|
fromHSV(h, s, v);
|
}
|
} else if (value.indexOf('hsv') !== -1) {
|
const parts = value.replace(/hsva|hsv|\(|\)/gm, '')
|
.split(/\s|,/g).filter((val) => val !== '').map((val, index) => index > 2 ? parseFloat(val) : parseInt(val, 10));
|
|
if (parts.length === 4) {
|
this._alpha = Math.floor(parseFloat(parts[3]) * 100);
|
} else if (parts.length === 3) {
|
this._alpha = 100;
|
}
|
if (parts.length >= 3) {
|
fromHSV(parts[0], parts[1], parts[2]);
|
}
|
} else if (value.indexOf('rgb') !== -1) {
|
const parts = value.replace(/rgba|rgb|\(|\)/gm, '')
|
.split(/\s|,/g).filter((val) => val !== '').map((val, index) => index > 2 ? parseFloat(val) : parseInt(val, 10));
|
|
if (parts.length === 4) {
|
this._alpha = Math.floor(parseFloat(parts[3]) * 100);
|
} else if (parts.length === 3) {
|
this._alpha = 100;
|
}
|
if (parts.length >= 3) {
|
const { h, s, v } = rgb2hsv(parts[0], parts[1], parts[2]);
|
fromHSV(h, s, v);
|
}
|
} else if (value.indexOf('#') !== -1) {
|
const hex = value.replace('#', '').trim();
|
if (!/^(?:[0-9a-fA-F]{3}){1,2}|[0-9a-fA-F]{8}$/.test(hex)) return;
|
let r, g, b;
|
|
if (hex.length === 3) {
|
r = parseHexChannel(hex[0] + hex[0]);
|
g = parseHexChannel(hex[1] + hex[1]);
|
b = parseHexChannel(hex[2] + hex[2]);
|
} else if (hex.length === 6 || hex.length === 8) {
|
r = parseHexChannel(hex.substring(0, 2));
|
g = parseHexChannel(hex.substring(2, 4));
|
b = parseHexChannel(hex.substring(4, 6));
|
}
|
|
if (hex.length === 8) {
|
this._alpha = Math.floor(parseHexChannel(hex.substring(6)) / 255 * 100);
|
} else if (hex.length === 3 || hex.length === 6) {
|
this._alpha = 100;
|
}
|
|
const { h, s, v } = rgb2hsv(r, g, b);
|
fromHSV(h, s, v);
|
}
|
}
|
|
compare(color) {
|
return Math.abs(color._hue - this._hue) < 2 &&
|
Math.abs(color._saturation - this._saturation) < 1 &&
|
Math.abs(color._value - this._value) < 1 &&
|
Math.abs(color._alpha - this._alpha) < 1;
|
}
|
|
doOnChange() {
|
const { _hue, _saturation, _value, _alpha, format } = this;
|
|
if (this.enableAlpha) {
|
switch (format) {
|
case 'hsl':
|
const hsl = hsv2hsl(_hue, _saturation / 100, _value / 100);
|
this.value = `hsla(${ _hue }, ${ Math.round(hsl[1] * 100) }%, ${ Math.round(hsl[2] * 100) }%, ${ _alpha / 100})`;
|
break;
|
case 'hsv':
|
this.value = `hsva(${ _hue }, ${ Math.round(_saturation) }%, ${ Math.round(_value) }%, ${ _alpha / 100})`;
|
break;
|
default:
|
const { r, g, b } = hsv2rgb(_hue, _saturation, _value);
|
this.value = `rgba(${r}, ${g}, ${b}, ${ _alpha / 100 })`;
|
}
|
} else {
|
switch (format) {
|
case 'hsl':
|
const hsl = hsv2hsl(_hue, _saturation / 100, _value / 100);
|
this.value = `hsl(${ _hue }, ${ Math.round(hsl[1] * 100) }%, ${ Math.round(hsl[2] * 100) }%)`;
|
break;
|
case 'hsv':
|
this.value = `hsv(${ _hue }, ${ Math.round(_saturation) }%, ${ Math.round(_value) }%)`;
|
break;
|
case 'rgb':
|
const { r, g, b } = hsv2rgb(_hue, _saturation, _value);
|
this.value = `rgb(${r}, ${g}, ${b})`;
|
break;
|
default:
|
this.value = toHex(hsv2rgb(_hue, _saturation, _value));
|
}
|
}
|
}
|
};
|
