chroma-js
Version:
JavaScript library for color conversions
44 lines (42 loc) • 1.42 kB
JavaScript
import Color from '../Color.js';
import { type } from '../utils/index.js';
Color.prototype.set = function (mc, value, mutate = false) {
const [mode, channel] = mc.split('.');
const src = this[mode]();
if (channel) {
const i = mode.indexOf(channel) - (mode.substr(0, 2) === 'ok' ? 2 : 0);
if (i > -1) {
if (type(value) == 'string') {
switch (value.charAt(0)) {
case '+':
src[i] += +value;
break;
case '-':
src[i] += +value;
break;
case '*':
src[i] *= +value.substr(1);
break;
case '/':
src[i] /= +value.substr(1);
break;
default:
src[i] = +value;
}
} else if (type(value) === 'number') {
src[i] = value;
} else {
throw new Error(`unsupported value for Color.set`);
}
const out = new Color(src, mode);
if (mutate) {
this._rgb = out._rgb;
return this;
}
return out;
}
throw new Error(`unknown channel ${channel} in mode ${mode}`);
} else {
return src;
}
};