36 lines
706 B
JavaScript
36 lines
706 B
JavaScript
var nodes = require('../nodes')
|
|
, rgba = require('./rgba');
|
|
|
|
/**
|
|
* Return the alpha component of the given `color`,
|
|
* or set the alpha component to the optional second `value` argument.
|
|
*
|
|
* Examples:
|
|
*
|
|
* alpha(#fff)
|
|
* // => 1
|
|
*
|
|
* alpha(rgba(0,0,0,0.3))
|
|
* // => 0.3
|
|
*
|
|
* alpha(#fff, 0.5)
|
|
* // => rgba(255,255,255,0.5)
|
|
*
|
|
* @param {RGBA|HSLA} color
|
|
* @param {Unit} [value]
|
|
* @return {Unit|RGBA}
|
|
* @api public
|
|
*/
|
|
|
|
module.exports = function alpha(color, value){
|
|
color = color.rgba;
|
|
if (value) {
|
|
return rgba(
|
|
new nodes.Unit(color.r),
|
|
new nodes.Unit(color.g),
|
|
new nodes.Unit(color.b),
|
|
value
|
|
);
|
|
}
|
|
return new nodes.Unit(color.a, '');
|
|
};
|