text: ﻿var IR = IR || {};
  
  (function (IR) {
      IR.Tween = {
          linear: function (t, b, c, d) {
              return b + t / d * c;
          },
          easeInQuad: function (t, b, c, d) {
              return c * (t /= d) * t + b;
          },
          easeOutQuad: function (t, b, c, d) {
              return -c * (t /= d) * (t - 2) + b;
          },
          easeInOutQuad: function (t, b, c, d) {
              if ((t /= d / 2) < 1) return c / 2 * t * t + b;
              return -c / 2 * ((--t) * (t - 2) - 1) + b;
          },
          easeInCubic: function (t, b, c, d) {
              return c * (t /= d) * t * t + b;
          },
          easeOutCubic: function (t, b, c, d) {
              return c * ((t = t / d - 1) * t * t + 1) + b;
          },
          easeInOutCubic: function (t, b, c, d) {
              if ((t /= d / 2) < 1) return c / 2 * t * t * t + b;
              return c / 2 * ((t -= 2) * t * t + 2) + b;
          },
          easeInQuart: function (t, b, c, d) {
              return c * (t /= d) * t * t * t + b;
          },
          easeOutQuart: function (t, b, c, d) {
              return -c * ((t = t / d - 1) * t * t * t - 1) + b;
          },
          easeInOutQuart: function (t, b, c, d) {
              if ((t /= d / 2) < 1) return c / 2 * t * t * t * t + b;
              return -c / 2 * ((t -= 2) * t * t * t - 2) + b;
          },
          easeInQuint: function (t, b, c, d) {
              return c * (t /= d) * t * t * t * t + b;
          },
          easeOutQuint: function (t, b, c, d) {
              return c * ((t = t / d - 1) * t * t * t * t + 1) + b;
          },
          easeInOutQuint: function (t, b, c, d) {
              if ((t /= d / 2) < 1) return c / 2 * t * t * t * t * t + b;
              return c / 2 * ((t -= 2) * t * t * t * t + 2) + b;
          },
          easeInSine: function (t, b, c, d) {
              return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;
          },
          easeOutSine: function (t, b, c, d) {
              return c * Math.sin(t / d * (Math.PI / 2)) + b;
          },
          easeInOutSine: function (t, b, c, d) {
              return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;
          },
          easeInExpo: function (t, b, c, d) {
              return (t == 0) ? b : c * Math.pow(2, 10 * (t / d - 1)) + b;
          },
          easeOutExpo: function (t, b, c, d) {
              return (t == d) ? b + c : c * (-Math.pow(2, -10 * t / d) + 1) + b;
          },
          easeInOutExpo: function (t, b, c, d) {
              if (t == 0) return b;
              if (t == d) return b + c;
              if ((t /= d / 2) < 1) return c / 2 * Math.pow(2, 10 * (t - 1)) + b;
              return c / 2 * (-Math.pow(2, -10 * --t) + 2) + b;
          },
          easeInCirc: function (t, b, c, d) {
              return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;
          },
          easeOutCirc: function (t, b, c, d) {
              return c * Math.sqrt(1 - (t = t / d - 1) * t) + b;
          },
          easeInOutCirc: function (t, b, c, d) {
              if ((t /= d / 2) < 1) return -c / 2 * (Math.sqrt(1 - t * t) - 1) + b;
              return c / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1) + b;
          },
          easeInElastic: function (t, b, c, d) {
              var s = 1.70158; var p = 0; var a = c;
              if (t == 0) return b; if ((t /= d) == 1) return b + c; if (!p) p = d * .3;
              if (a < Math.abs(c)) { a = c; var s = p / 4; }
              else var s = p / (2 * Math.PI) * Math.asin(c / a);
              return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
          },
          easeOutElastic: function (t, b, c, d) {
              var s = 1.70158; var p = 0; var a = c;
              if (t == 0) return b; if ((t /= d) == 1) return b + c; if (!p) p = d * .3;
              if (a < Math.abs(c)) { a = c; var s = p / 4; }
              else var s = p / (2 * Math.PI) * Math.asin(c / a);
              return a * Math.pow(2, -10 * t) * Math.sin((t * d - s) * (2 * Math.PI) / p) + c + b;
          },
          easeInOutElastic: function (t, b, c, d) {
              var s = 1.70158; var p = 0; var a = c;
              if (t == 0) return b; if ((t /= d / 2) == 2) return b + c; if (!p) p = d * (.3 * 1.5);
              if (a < Math.abs(c)) { a = c; var s = p / 4; }
              else var s = p / (2 * Math.PI) * Math.asin(c / a);
              if (t < 1) return -.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
              return a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p) * .5 + c + b;
          },
          easeInBack: function (t, b, c, d, s) {
              if (s == undefined) s = 1.70158;
              return c * (t /= d) * t * ((s + 1) * t - s) + b;
          },
          easeOutBack: function (t, b, c, d, s) {
              if (s == undefined) s = 1.70158;
              return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
          },
          easeInOutBack: function (t, b, c, d, s) {
              if (s == undefined) s = 1.70158;
              if ((t /= d / 2) < 1) return c / 2 * (t * t * (((s *= (1.525)) + 1) * t - s)) + b;
              return c / 2 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2) + b;
          },
          easeInBounce: function (t, b, c, d) {
              return c - this.easeOutBounce(d - t, 0, c, d) + b;
          },
          easeOutBounce: function (t, b, c, d) {
              if ((t /= d) < (1 / 2.75)) {
                  return c * (7.5625 * t * t) + b;
              } else if (t < (2 / 2.75)) {
                  return c * (7.5625 * (t -= (1.5 / 2.75)) * t + .75) + b;
              } else if (t < (2.5 / 2.75)) {
                  return c * (7.5625 * (t -= (2.25 / 2.75)) * t + .9375) + b;
              } else {
                  return c * (7.5625 * (t -= (2.625 / 2.75)) * t + .984375) + b;
              }
          },
          easeInOutBounce: function (t, b, c, d) {
              if (t < d / 2) return this.easeInBounce(t * 2, 0, c, d) * .5 + b;
              return this.easeOutBounce(t * 2 - d, 0, c, d) * .5 + c * .5 + b;
          }
  
      }
  })(IR);