easing.js

import { Easing } from 'react-native';

const EASING_FUNCTIONS = {
  // Standard CSS easings

  linear: Easing.linear,
  ease: Easing.bezier(0.25, 0.1, 0.25, 1),
  'ease-in': Easing.bezier(0.42, 0, 1, 1),
  'ease-out': Easing.bezier(0, 0, 0.58, 1),
  'ease-in-out': Easing.bezier(0.42, 0, 0.58, 1),

  // Penner Equations - http://matthewlein.com/ceaser/ & http://easings.net

  'ease-in-cubic': Easing.bezier(0.55, 0.055, 0.675, 0.19),
  'ease-out-cubic': Easing.bezier(0.215, 0.61, 0.355, 1.0),
  'ease-in-out-cubic': Easing.bezier(0.645, 0.045, 0.355, 1.0),

  'ease-in-circ': Easing.bezier(0.6, 0.04, 0.98, 0.335),
  'ease-out-circ': Easing.bezier(0.075, 0.82, 0.165, 1.0),
  'ease-in-out-circ': Easing.bezier(0.785, 0.135, 0.15, 0.86),

  'ease-in-expo': Easing.bezier(0.95, 0.05, 0.795, 0.035),
  'ease-out-expo': Easing.bezier(0.19, 1.0, 0.22, 1.0),
  'ease-in-out-expo': Easing.bezier(1.0, 0.0, 0.0, 1.0),

  'ease-in-quad': Easing.bezier(0.55, 0.085, 0.68, 0.53),
  'ease-out-quad': Easing.bezier(0.25, 0.46, 0.45, 0.94),
  'ease-in-out-quad': Easing.bezier(0.455, 0.03, 0.515, 0.955),

  'ease-in-quart': Easing.bezier(0.895, 0.03, 0.685, 0.22),
  'ease-out-quart': Easing.bezier(0.165, 0.84, 0.44, 1.0),
  'ease-in-out-quart': Easing.bezier(0.77, 0.0, 0.175, 1.0),

  'ease-in-quint': Easing.bezier(0.755, 0.05, 0.855, 0.06),
  'ease-out-quint': Easing.bezier(0.23, 1.0, 0.32, 1.0),
  'ease-in-out-quint': Easing.bezier(0.86, 0.0, 0.07, 1.0),

  'ease-in-sine': Easing.bezier(0.47, 0.0, 0.745, 0.715),
  'ease-out-sine': Easing.bezier(0.39, 0.575, 0.565, 1.0),
  'ease-in-out-sine': Easing.bezier(0.445, 0.05, 0.55, 0.95),

  'ease-in-back': Easing.bezier(0.6, -0.28, 0.735, 0.045),
  'ease-out-back': Easing.bezier(0.175, 0.885, 0.32, 1.275),
  'ease-in-out-back': Easing.bezier(0.68, -0.55, 0.265, 1.55),
};

export default EASING_FUNCTIONS;