Function registerBackInOut

velocity.js:3482–3494

(name, amount)

      }]);
  }
  function registerBackInOut(name, amount) {
      amount *= 1.525;
      registerEasing([name, function (percentComplete, startValue, endValue) {
          if (percentComplete === 0) {
              return startValue;
          }
          if (percentComplete === 1) {
              return endValue;
          }
          percentComplete *= 2;
          return (percentComplete < 1 ? Math.pow(percentComplete, 2) * ((amount + 1) * percentComplete - amount) : Math.pow(percentComplete - 2, 2) * ((amount + 1) * (percentComplete - 2) + amount) + 2) * 0.5 * (endValue - startValue);
      }]);
  }
  registerBackIn("easeInBack", 1.7);
  registerBackOut("easeOutBack", 1.7);
  registerBackInOut("easeInOutBack", 1.7);