scrollto-with-animation/lib/easings.js

Animated scroll with requestAnimationFrame. For smooth animate scrollTo defining the easing, running at 60FPS and cross-browser

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = {
  linearTween: function linearTween(t, b, c, d) {
    return c * t / d + b;
  },
  easeInQuad: function easeInQuad(t, b, c, d) {
    t /= d;
    return c * t * t + b;
  },
  easeOutQuad: function easeOutQuad(t, b, c, d) {
    t /= d;
    return -c * t * (t - 2) + b;
  },
  easeInOutQuad: function easeInOutQuad(t, b, c, d) {
    t /= d / 2;
    if (t < 1) return c / 2 * t * t + b;
    t--;
    return -c / 2 * (t * (t - 2) - 1) + b;
  },
  easeInCubic: function easeInCubic(t, b, c, d) {
    t /= d;
    return c * t * t * t + b;
  },
  easeOutCubic: function easeOutCubic(t, b, c, d) {
    t /= d;
    t--;
    return c * (t * t * t + 1) + b;
  },
  easeInOutCubic: function easeInOutCubic(t, b, c, d) {
    t /= d / 2;
    if (t < 1) return c / 2 * t * t * t + b;
    t -= 2;
    return c / 2 * (t * t * t + 2) + b;
  },
  easeInQuart: function easeInQuart(t, b, c, d) {
    t /= d;
    return c * t * t * t * t + b;
  },
  easeOutQuart: function easeOutQuart(t, b, c, d) {
    t /= d;
    t--;
    return -c * (t * t * t * t - 1) + b;
  },
  easeInOutQuart: function easeInOutQuart(t, b, c, d) {
    t /= d / 2;
    if (t < 1) return c / 2 * t * t * t * t + b;
    t -= 2;
    return -c / 2 * (t * t * t * t - 2) + b;
  },
  easeInQuint: function easeInQuint(t, b, c, d) {
    t /= d;
    return c * t * t * t * t * t + b;
  },
  easeOutQuint: function easeOutQuint(t, b, c, d) {
    t /= d;
    t--;
    return c * (t * t * t * t * t + 1) + b;
  },
  easeInOutQuint: function easeInOutQuint(t, b, c, d) {
    t /= d / 2;
    if (t < 1) return c / 2 * t * t * t * t * t + b;
    t -= 2;
    return c / 2 * (t * t * t * t * t + 2) + b;
  },
  easeInSine: function easeInSine(t, b, c, d) {
    return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;
  },
  easeOutSine: function easeOutSine(t, b, c, d) {
    return c * Math.sin(t / d * (Math.PI / 2)) + b;
  },
  easeInOutSine: function easeInOutSine(t, b, c, d) {
    return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;
  },
  easeInExpo: function easeInExpo(t, b, c, d) {
    return c * Math.pow(2, 10 * (t / d - 1)) + b;
  },
  easeOutExpo: function easeOutExpo(t, b, c, d) {
    return c * (-Math.pow(2, -10 * t / d) + 1) + b;
  },
  easeInOutExpo: function easeInOutExpo(t, b, c, d) {
    t /= d / 2;
    if (t < 1) return c / 2 * Math.pow(2, 10 * (t - 1)) + b;
    t--;
    return c / 2 * (-Math.pow(2, -10 * t) + 2) + b;
  },
  easeInCirc: function easeInCirc(t, b, c, d) {
    t /= d;
    return -c * (Math.sqrt(1 - t * t) - 1) + b;
  },
  easeOutCirc: function easeOutCirc(t, b, c, d) {
    t /= d;
    t--;
    return c * Math.sqrt(1 - t * t) + b;
  },
  easeInOutCirc: function easeInOutCirc(t, b, c, d) {
    t /= d / 2;
    if (t < 1) return -c / 2 * (Math.sqrt(1 - t * t) - 1) + b;
    t -= 2;
    return c / 2 * (Math.sqrt(1 - t * t) + 1) + b;
  }
};