mirror of https://github.com/jkjoy/sunpeiwen.git
62 lines
1.6 KiB
JavaScript
62 lines
1.6 KiB
JavaScript
var utils = require('../utils')
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, nodes = require('../nodes');
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/**
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* Return a `RGBA` from the r,g,b,a channels.
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*
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* Examples:
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*
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* rgba(255,0,0,0.5)
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* // => rgba(255,0,0,0.5)
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*
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* rgba(255,0,0,1)
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* // => #ff0000
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*
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* rgba(#ffcc00, 50%)
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* // rgba(255,204,0,0.5)
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*
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* @param {Unit|RGBA|HSLA} red
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* @param {Unit} green
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* @param {Unit} blue
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* @param {Unit} alpha
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* @return {RGBA}
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* @api public
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*/
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function rgba(red, green, blue, alpha){
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switch (arguments.length) {
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case 1:
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utils.assertColor(red);
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return red.rgba;
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case 2:
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utils.assertColor(red);
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var color = red.rgba;
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utils.assertType(green, 'unit', 'alpha');
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alpha = green.clone();
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if ('%' == alpha.type) alpha.val /= 100;
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return new nodes.RGBA(
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color.r
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, color.g
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, color.b
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, alpha.val);
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default:
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utils.assertType(red, 'unit', 'red');
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utils.assertType(green, 'unit', 'green');
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utils.assertType(blue, 'unit', 'blue');
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utils.assertType(alpha, 'unit', 'alpha');
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var r = '%' == red.type ? Math.round(red.val * 2.55) : red.val
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, g = '%' == green.type ? Math.round(green.val * 2.55) : green.val
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, b = '%' == blue.type ? Math.round(blue.val * 2.55) : blue.val;
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alpha = alpha.clone();
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if (alpha && '%' == alpha.type) alpha.val /= 100;
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return new nodes.RGBA(
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r
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, g
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, b
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, alpha.val);
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}
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}
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rgba.params = ['red', 'green', 'blue', 'alpha'];
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module.exports = rgba;
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