89 lines
2.6 KiB
JavaScript
89 lines
2.6 KiB
JavaScript
if (typeof(require) !== 'undefined') { var tree = require('less/tree') }
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//
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// RGB Colors - #ff0014, #eee
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//
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tree.Color = function Color(rgb, a) {
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//
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// The end goal here, is to parse the arguments
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// into an integer triplet, such as `128, 255, 0`
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//
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// This facilitates operations and conversions.
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//
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if (Array.isArray(rgb)) {
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this.rgb = rgb;
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this.alpha = a;
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} else if (rgb.length == 6) {
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this.rgb = rgb.match(/.{2}/g).map(function (c) {
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return parseInt(c, 16);
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});
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} else {
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this.rgb = rgb.split('').map(function (c) {
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return parseInt(c + c, 16);
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});
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}
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};
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tree.Color.prototype = {
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eval: function () { return this },
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//
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// If we have some transparency, the only way to represent it
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// is via `rgba`. Otherwise, we use the hex representation,
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// which has better compatibility with older browsers.
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// Values are capped between `0` and `255`, rounded and zero-padded.
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//
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toCSS: function () {
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if (this.alpha && this.alpha < 1.0) {
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return "rgba(" + this.rgb.concat(this.alpha).join(', ') + ")";
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} else {
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return '#' + this.rgb.map(function (i) {
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i = Math.round(i);
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i = (i > 255 ? 255 : (i < 0 ? 0 : i)).toString(16);
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return i.length === 1 ? '0' + i : i;
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}).join('');
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}
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},
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//
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// Operations have to be done per-channel, if not,
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// channels will spill onto each other. Once we have
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// our result, in the form of an integer triplet,
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// we create a new Color node to hold the result.
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//
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operate: function (op, other) {
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var result = [];
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if (! (other instanceof tree.Color)) {
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other = other.toColor();
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}
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for (var c = 0; c < 3; c++) {
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result[c] = tree.operate(op, this.rgb[c], other.rgb[c]);
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}
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return new(tree.Color)(result);
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},
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toHSL: function () {
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var r = this.rgb[0] / 255,
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g = this.rgb[1] / 255,
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b = this.rgb[2] / 255;
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var max = Math.max(r, g, b), min = Math.min(r, g, b);
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var h, s, l = (max + min) / 2, d = max - min;
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if (max === min) {
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h = s = 0;
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} else {
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s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
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switch (max) {
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case r: h = (g - b) / d + (g < b ? 6 : 0); break;
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case g: h = (b - r) / d + 2; break;
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case b: h = (r - g) / d + 4; break;
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}
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h /= 6;
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}
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return { h: h * 360, s: s, l: l };
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}
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};
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