canvas-sketch-util/lib/wrap.js

Utilities for sketching in Canvas, WebGL and generative art

module.exports = wrap;
function wrap (value, from, to) {
  if (typeof from !== 'number' || typeof to !== 'number') {
    throw new TypeError('Must specify "to" and "from" arguments as numbers');
  }
  // algorithm from http://stackoverflow.com/a/5852628/599884
  if (from > to) {
    var t = from;
    from = to;
    to = t;
  }
  var cycle = to - from;
  if (cycle === 0) {
    return to;
  }
  return value - cycle * Math.floor((value - from) / cycle);
}