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76 lines
2.3 KiB
JavaScript
76 lines
2.3 KiB
JavaScript
var Color = function () {};
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/**
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* Convert a Scratch decimal color to a hex string, #RRGGBB.
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* @param {number} decimal RGB color as a decimal.
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* @return {string} RGB color as #RRGGBB hex string.
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*/
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Color.decimalToHex = function (decimal) {
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if (decimal < 0) {
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decimal += 0xFFFFFF + 1;
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}
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var hex = Number(decimal).toString(16);
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hex = '#' + '000000'.substr(0, 6 - hex.length) + hex;
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return hex;
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};
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/**
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* Convert a Scratch decimal color to an RGB color object.
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* @param {number} decimal RGB color as decimal.
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* @returns {Object} {r: R, g: G, b: B}, values between 0-255
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*/
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Color.decimalToRgb = function (decimal) {
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var r = (decimal >> 16) & 0xFF;
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var g = (decimal >> 8) & 0xFF;
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var b = decimal & 0xFF;
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return {r: r, g: g, b: b};
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};
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/**
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* Convert a hex color (e.g., F00, #03F, #0033FF) to an RGB color object.
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* CC-BY-SA Tim Down:
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* https://stackoverflow.com/questions/5623838/rgb-to-hex-and-hex-to-rgb
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* @param {!string} hex Hex representation of the color.
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* @return {Object} {r: R, g: G, b: B}, 0-255, or null.
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*/
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Color.hexToRgb = function (hex) {
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var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
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hex = hex.replace(shorthandRegex, function (m, r, g, b) {
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return r + r + g + g + b + b;
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});
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var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
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return result ? {
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r: parseInt(result[1], 16),
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g: parseInt(result[2], 16),
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b: parseInt(result[3], 16)
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} : null;
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};
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/**
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* Convert an RGB color object to a hex color.
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* @param {Object} rgb {r: R, g: G, b: B}, values between 0-255.
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* @return {!string} Hex representation of the color.
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*/
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Color.rgbToHex = function (rgb) {
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return Color.decimalToHex(Color.rgbToDecimal(rgb));
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};
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/**
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* Convert an RGB color object to a Scratch decimal color.
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* @param {Object} rgb {r: R, g: G, b: B}, values between 0-255.
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* @return {!number} Number representing the color.
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*/
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Color.rgbToDecimal = function (rgb) {
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return (rgb.r << 16) + (rgb.g << 8) + rgb.b;
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};
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/**
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* Convert a hex color (e.g., F00, #03F, #0033FF) to a decimal color number.
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* @param {!string} hex Hex representation of the color.
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* @return {!number} Number representing the color.
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*/
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Color.hexToDecimal = function (hex) {
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return Color.rgbToDecimal(Color.hexToRgb(hex));
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};
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module.exports = Color;
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