colors.js

"use strict";
/**
 * Extract red color out of a color integer:
 *
 * 0x00DEAD -> 0x00
 *
 * @param  {Number} color
 * @return {Number}
 */
function red(color) {
    return color >> 16;
}
/**
 * Extract green out of a color integer:
 *
 * 0x00DEAD -> 0xDE
 *
 * @param  {Number} color
 * @return {Number}
 */
function green(color) {
    return (color >> 8) & 0xff;
}
/**
 * Extract blue color out of a color integer:
 *
 * 0x00DEAD -> 0xAD
 *
 * @param  {Number} color
 * @return {Number}
 */
function blue(color) {
    return color & 0xff;
}
/**
 * Converts an integer containing a color such as 0x00DEAD to a hex
 * string, such as '#00DEAD';
 *
 * @param  {Number} int
 * @return {String}
 */
function intToHex(int) {
    const mask = "#000000";
    const hex = int.toString(16);
    return mask.substring(0, 7 - hex.length) + hex;
}
/**
 * Converts a hex string containing a color such as '#00DEAD' to
 * an integer, such as 0x00DEAD;
 *
 * @param  {Number} num
 * @return {String}
 */
function hexToInt(hex) {
    return parseInt(hex.substring(1), 16);
}
module.exports = {
    red,
    green,
    blue,
    intToHex,
    hexToInt,
};