source: trip-planner-front/node_modules/stylus/lib/functions/adjust.js@ fa375fe

Last change on this file since fa375fe was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 788 bytes
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1var utils = require('../utils');
2
3/**
4 * Adjust HSL `color` `prop` by `amount`.
5 *
6 * @param {RGBA|HSLA} color
7 * @param {String} prop
8 * @param {Unit} amount
9 * @return {RGBA}
10 * @api private
11 */
12
13function adjust(color, prop, amount){
14 utils.assertColor(color, 'color');
15 utils.assertString(prop, 'prop');
16 utils.assertType(amount, 'unit', 'amount');
17 var hsl = color.hsla.clone();
18 prop = { hue: 'h', saturation: 's', lightness: 'l' }[prop.string];
19 if (!prop) throw new Error('invalid adjustment property');
20 var val = amount.val;
21 if ('%' == amount.type){
22 val = 'l' == prop && val > 0
23 ? (100 - hsl[prop]) * val / 100
24 : hsl[prop] * (val / 100);
25 }
26 hsl[prop] += val;
27 return hsl.rgba;
28};
29adjust.params = ['color', 'prop', 'amount'];
30module.exports = adjust;
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