pure-color/convert/rgb2hex.js

Pure functions for color conversion and parsing

var clamp = require("../util/clamp");

function componentToHex(c) {
  var value = Math.round(clamp(c, 0, 255));
  var hex   = value.toString(16);

  return hex.length == 1 ? "0" + hex : hex;
}

function rgb2hex(rgb) {
  var alpha = rgb.length === 4 ? componentToHex(rgb[3] * 255) : "";

  return "#" + componentToHex(rgb[0]) + componentToHex(rgb[1]) + componentToHex(rgb[2]) + alpha;
}

module.exports = rgb2hex;