tweenkle/es/easing/Expo.js

Lightweight tweening library for all your tweening and animation needs.

export var In = function In(time, beginningValue, changeValue, duration) {
  return time === 0 ? beginningValue : changeValue * Math.pow(2, 10 * (time / duration - 1)) + beginningValue;
};
export var Out = function Out(time, beginningValue, changeValue, duration) {
  return time === duration ? beginningValue + changeValue : changeValue * (-Math.pow(2, -10 * time / duration) + 1) + beginningValue;
};
export var InOut = function InOut(time, beginningValue, changeValue, duration) {
  if (time === 0) {
    return beginningValue;
  }

  if (time === duration) {
    return beginningValue + changeValue;
  }

  if ((time /= duration / 2) < 1) {
    return changeValue / 2 * Math.pow(2, 10 * (time - 1)) + beginningValue;
  }

  return changeValue / 2 * (-Math.pow(2, -10 * --time) + 2) + beginningValue;
};
export default {
  In: In,
  Out: Out,
  InOut: InOut
};