ES6: exports for eacheach easing functions

easingFunctions.js

/*
 * original is skylerspark's easing functions.
 * ref: https://gist.github.com/gre/1650294#gistcomment-3141432
 */

// no easing, no acceleration
export const linear = t => {
  return t
}
// accelerating from zero velocity
export const easeInQuad = t => {
  return t * t
}
// decelerating to zero velocity
export const easeOutQuad = t => {
  return t * (2 - t)
}
// acceleration until halfway, then deceleration
export const easeInOutQuad = t => {
  return t < 0.5 ? 2 * t * t : -1 + (4 - 2 * t) * t
}
// accelerating from zero velocity
export const easeInCubic = t => {
  return t * t * t
}
// decelerating to zero velocity
export const easeOutCubic = t => {
  return --t * t * t + 1
}
// acceleration until halfway, then deceleration
export const easeInOutCubic = t => {
  return t < 0.5 ? 4 * t * t * t : (t - 1) * (2 * t - 2) * (2 * t - 2) + 1
}
// accelerating from zero velocity
export const easeInQuart = t => {
  return t * t * t * t
}
// decelerating to zero velocity
export const easeOutQuart = t => {
  return 1 - --t * t * t * t
}
// acceleration until halfway, then deceleration
export const easeInOutQuart = t => {
  return t < 0.5 ? 8 * t * t * t * t : 1 - 8 * --t * t * t * t
}
// accelerating from zero velocity
export const easeInQuint = t => {
  return t * t * t * t * t
}
// decelerating to zero velocity
export const easeOutQuint = t => {
  return 1 + --t * t * t * t * t
}
// acceleration until halfway, then deceleration
export const easeInOutQuint = t => {
  return t < 0.5 ? 16 * t * t * t * t * t : 1 + 16 * --t * t * t * t * t
}