In case I ever need it: Color tracker for secret click-detection mirror canvases

tracking-colors.js

var hash = require('string-hash');

function TrackingColors() {
  var idsForColors = {};
  return {
    getTrackingColorForId,
    getIdForTrackingColor
  };

  function getTrackingColorForId(id) {
    var colorString = '#' + hash(id).toString(16);
    idsForColors[colorString] = id;
    return colorString;
  }

  function getIdForTrackingColor(colorString) {
    return idsForColors[colorString];
  }
}

module.exports = TrackingColors;