46 lines
1.3 KiB
JavaScript
46 lines
1.3 KiB
JavaScript
if (typeof(window) === 'undefined') { var tree = require(require('path').join(__dirname, '..', 'less', 'tree')); }
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tree.functions = {
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rgb: function (r, g, b) {
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return this.rgba(r, g, b, 1.0);
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},
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rgba: function (r, g, b, a) {
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var rgb = [r, g, b].map(function (c) { return number(c) }),
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a = number(a);
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return new(tree.Color)(rgb, a);
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},
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hsl: function (h, s, l) {
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return this.hsla(h, s, l, 1.0);
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},
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hsla: function (h, s, l, a) {
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h = number(h); s = number(s);
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l = number(l); a = number(a);
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var m2 = l <= 0.5 ? l * (s + 1) : l + s - l * s;
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var m1 = l * 2 - m2;
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return this.rgba(hue(h + 1/3), hue(h), hue(h - 1/3), a);
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function hue(h) {
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h = h < 0 ? h + 1 : (h > 1 ? h - 1 : h);
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if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
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else if (h * 2 < 1) return m2;
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else if (h * 3 < 2) return m1 + (m2 - m1) * (2/3 - h) * 6;
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else return m1;
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}
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}
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};
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function number(n) {
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if (n instanceof tree.Dimension) {
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return parseFloat(n.value);
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} else if (typeof(n) === 'number') {
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return n;
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} else {
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throw {
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error: "RuntimeError",
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message: "color functions take numbers as parameters"
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};
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}
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}
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