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53 lines
1.8 KiB
JavaScript
53 lines
1.8 KiB
JavaScript
8 years ago
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define(function () {
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var padZero = function (str, len) {
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len = len || 2;
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var zeros = new Array(len).join('0');
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return (zeros + str).slice(-len);
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};
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var invertColor = function (hex) {
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if (hex.indexOf('#') === 0) {
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hex = hex.slice(1);
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}
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// convert 3-digit hex to 6-digits.
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if (hex.length === 3) {
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hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2];
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}
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if (hex.length !== 6) {
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console.error(hex);
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throw new Error('Invalid HEX color.');
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}
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// invert color components
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var r = (255 - parseInt(hex.slice(0, 2), 16)).toString(16),
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g = (255 - parseInt(hex.slice(2, 4), 16)).toString(16),
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b = (255 - parseInt(hex.slice(4, 6), 16)).toString(16);
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// pad each with zeros and return
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return '#' + padZero(r) + padZero(g) + padZero(b);
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};
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var rgb2hex = function (rgb) {
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if (rgb.indexOf('#') === 0) { return rgb; }
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rgb = rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
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var hex = function (x) {
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return ("0" + parseInt(x).toString(16)).slice(-2);
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};
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return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
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};
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var hex2rgba = function (hex, opacity) {
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if (hex.indexOf('#') === 0) {
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hex = hex.slice(1);
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}
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if (hex.length === 3) {
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hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2];
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}
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if (!opacity) { opacity = 1; }
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var r = parseInt(hex.slice(0,2), 16);
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var g = parseInt(hex.slice(2,4), 16);
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var b = parseInt(hex.slice(4,6), 16);
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return 'rgba('+r+', '+g+', '+b+', '+opacity+')';
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};
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return {
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invert: invertColor,
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rgb2hex: rgb2hex,
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hex2rgba: hex2rgba
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};
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});
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