# all files / ol/ easing.js

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     goog.provide('ol.easing');

    /**
     * Start slow and speed up.
     * @param {number} t Input between 0 and 1.
     * @return {number} Output between 0 and 1.
     * @api
     */
    ol.easing.easeIn = function(t) {
      return Math.pow(t, 3);
    };

    /**
     * Start fast and slow down.
     * @param {number} t Input between 0 and 1.
     * @return {number} Output between 0 and 1.
     * @api
     */
    ol.easing.easeOut = function(t) {
      return 1 - ol.easing.easeIn(1 - t);
    };

    /**
     * Start slow, speed up, and then slow down again.
     * @param {number} t Input between 0 and 1.
     * @return {number} Output between 0 and 1.
     * @api
     */
    ol.easing.inAndOut = function(t) {
      return 3 * t * t - 2 * t * t * t;
    };

    /**
     * Maintain a constant speed over time.
     * @param {number} t Input between 0 and 1.
     * @return {number} Output between 0 and 1.
     * @api
     */
    ol.easing.linear = function(t) {
      return t;
    };

    /**
     * Start slow, speed up, and at the very end slow down again.  This has the
     * same general behavior as {@link ol.easing.inAndOut}, but the final slowdown
     * is delayed.
     * @param {number} t Input between 0 and 1.
     * @return {number} Output between 0 and 1.
     * @api
     */
    ol.easing.upAndDown = function(t) {
      if (t < 0.5) {
        return ol.easing.inAndOut(2 * t);
      } else {
        return 1 - ol.easing.inAndOut(2 * (t - 0.5));
      }
    };