Last change
on this file since 571e0df was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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[6a3a178] | 1 | var nodes = require('../nodes')
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| 2 | , rgba = require('./rgba');
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| 3 |
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| 4 | /**
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| 5 | * Return the alpha component of the given `color`,
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| 6 | * or set the alpha component to the optional second `value` argument.
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| 7 | *
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| 8 | * Examples:
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| 9 | *
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| 10 | * alpha(#fff)
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| 11 | * // => 1
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| 12 | *
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| 13 | * alpha(rgba(0,0,0,0.3))
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| 14 | * // => 0.3
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| 15 | *
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| 16 | * alpha(#fff, 0.5)
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| 17 | * // => rgba(255,255,255,0.5)
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| 18 | *
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| 19 | * @param {RGBA|HSLA} color
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| 20 | * @param {Unit} [value]
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| 21 | * @return {Unit|RGBA}
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| 22 | * @api public
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| 23 | */
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| 24 |
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| 25 | function alpha(color, value){
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| 26 | color = color.rgba;
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| 27 | if (value) {
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| 28 | return rgba(
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| 29 | new nodes.Unit(color.r),
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| 30 | new nodes.Unit(color.g),
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| 31 | new nodes.Unit(color.b),
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| 32 | value
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| 33 | );
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| 34 | }
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| 35 | return new nodes.Unit(color.a, '');
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| 36 | };
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| 37 | alpha.params = ['color', 'value'];
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| 38 | module.exports = alpha;
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