@daredrop/react-scroll/modules/mixins/smooth.js

A scroll component for React.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = {
  /*
   * https://github.com/oblador/angular-scroll (duScrollDefaultEasing)
   */
  defaultEasing: function defaultEasing(x) {
    if (x < 0.5) {
      return Math.pow(x * 2, 2) / 2;
    }
    return 1 - Math.pow((1 - x) * 2, 2) / 2;
  },
  /*
   * https://gist.github.com/gre/1650294
   */
  // no easing, no acceleration
  linear: function linear(x) {
    return x;
  },
  // accelerating from zero velocity
  easeInQuad: function easeInQuad(x) {
    return x * x;
  },
  // decelerating to zero velocity
  easeOutQuad: function easeOutQuad(x) {
    return x * (2 - x);
  },
  // acceleration until halfway, then deceleration
  easeInOutQuad: function easeInOutQuad(x) {
    return x < .5 ? 2 * x * x : -1 + (4 - 2 * x) * x;
  },
  // accelerating from zero velocity 
  easeInCubic: function easeInCubic(x) {
    return x * x * x;
  },
  // decelerating to zero velocity π
  easeOutCubic: function easeOutCubic(x) {
    return --x * x * x + 1;
  },
  // acceleration until halfway, then deceleration 
  easeInOutCubic: function easeInOutCubic(x) {
    return x < .5 ? 4 * x * x * x : (x - 1) * (2 * x - 2) * (2 * x - 2) + 1;
  },
  // accelerating from zero velocity 
  easeInQuart: function easeInQuart(x) {
    return x * x * x * x;
  },
  // decelerating to zero velocity 
  easeOutQuart: function easeOutQuart(x) {
    return 1 - --x * x * x * x;
  },
  // acceleration until halfway, then deceleration
  easeInOutQuart: function easeInOutQuart(x) {
    return x < .5 ? 8 * x * x * x * x : 1 - 8 * --x * x * x * x;
  },
  // accelerating from zero velocity
  easeInQuint: function easeInQuint(x) {
    return x * x * x * x * x;
  },
  // decelerating to zero velocity
  easeOutQuint: function easeOutQuint(x) {
    return 1 + --x * x * x * x * x;
  },
  // acceleration until halfway, then deceleration 
  easeInOutQuint: function easeInOutQuint(x) {
    return x < .5 ? 16 * x * x * x * x * x : 1 + 16 * --x * x * x * x * x;
  }
};