text: 'use strict';
  
  // Originally from https://gist.github.com/gre/1650294
  
  /*
   * Easing Functions - inspired from http://gizma.com/easing/
   * only considering the t value for the range [0, 1] => [0, 1]
   */
  var EasingFunctions = {
    // no easing, no acceleration
    linear: function (t) { return t },
    // accelerating from zero velocity
    easeInQuad: function (t) { return t*t },
    // decelerating to zero velocity
    easeOutQuad: function (t) { return t*(2-t) },
    // acceleration until halfway, then deceleration
    easeInOutQuad: function (t) { return t<.5 ? 2*t*t : -1+(4-2*t)*t },
    // accelerating from zero velocity 
    easeInCubic: function (t) { return t*t*t },
    // decelerating to zero velocity 
    easeOutCubic: function (t) { return (--t)*t*t+1 },
    // acceleration until halfway, then deceleration 
    easeInOutCubic: function (t) { return t<.5 ? 4*t*t*t : (t-1)*(2*t-2)*(2*t-2)+1 },
    // accelerating from zero velocity 
    easeInQuart: function (t) { return t*t*t*t },
    // decelerating to zero velocity 
    easeOutQuart: function (t) { return 1-(--t)*t*t*t },
    // acceleration until halfway, then deceleration
    easeInOutQuart: function (t) { return t<.5 ? 8*t*t*t*t : 1-8*(--t)*t*t*t },
    // accelerating from zero velocity
    easeInQuint: function (t) { return t*t*t*t*t },
    // decelerating to zero velocity
    easeOutQuint: function (t) { return 1+(--t)*t*t*t*t },
    // acceleration until halfway, then deceleration 
    easeInOutQuint: function (t) { return t<.5 ? 16*t*t*t*t*t : 1+16*(--t)*t*t*t*t },
    
    // step
    step: function(t) { return t<.5 ? 0 : 1 }
  };
  
  module.exports = EasingFunctions;