nearest-periodic-value/dist/nearest-periodic-value.js

Find the nearest value of a discrete periodic function, given a point.

(function (global, factory) {
  typeof exports === "object" && typeof module !== "undefined" ? module.exports = factory() : typeof define === "function" && define.amd ? define(factory) : global.nearestPeriodicValue = factory();
})(this, function () {
  "use strict";

  /*jshint -W018 */

  function nearestPeriodicValue(point, value, period) {
    var relation = (value - point) / period;

    // We're equidistant from the nearest point if the
    // distance from the point is a half-integer value
    // of our period.
    var equidistant = !(relation % 0.5) && relation % 1;

    // If we're equidistant, then we add a period to
    // ensure that we always pick the value in front
    var mod = equidistant ? period : 0;

    // Adjust our value by an amount given by the closest #
    // of periods contained in the distance between the point
    // and the value
    return mod + (value - period * Math.round(relation));
  }

  var nearest_periodic_value = nearestPeriodicValue;

  return nearest_periodic_value;
});
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