You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
28 lines
735 B
28 lines
735 B
var utils = require('../utils'); |
|
|
|
/** |
|
* Adjust HSL `color` `prop` by `amount`. |
|
* |
|
* @param {RGBA|HSLA} color |
|
* @param {String} prop |
|
* @param {Unit} amount |
|
* @return {RGBA} |
|
* @api private |
|
*/ |
|
|
|
module.exports = function adjust(color, prop, amount){ |
|
utils.assertColor(color, 'color'); |
|
utils.assertString(prop, 'prop'); |
|
utils.assertType(amount, 'unit', 'amount'); |
|
var hsl = color.hsla.clone(); |
|
prop = { hue: 'h', saturation: 's', lightness: 'l' }[prop.string]; |
|
if (!prop) throw new Error('invalid adjustment property'); |
|
var val = amount.val; |
|
if ('%' == amount.type){ |
|
val = 'l' == prop && val > 0 |
|
? (100 - hsl[prop]) * val / 100 |
|
: hsl[prop] * (val / 100); |
|
} |
|
hsl[prop] += val; |
|
return hsl.rgba; |
|
};
|
|
|