server/aspnetapp/wwwroot/lib/swiper/src/components/controller/controller.js

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/* eslint no-bitwise: ["error", { "allow": [">>"] }] */
import Swiper from '../core/core-class';
import Utils from '../../utils/utils';

const Controller = {
  LinearSpline: function LinearSpline(x, y) {
    const binarySearch = (function search() {
      let maxIndex;
      let minIndex;
      let guess;
      return (array, val) => {
        minIndex = -1;
        maxIndex = array.length;
        while (maxIndex - minIndex > 1) {
          guess = maxIndex + minIndex >> 1;
          if (array[guess] <= val) {
            minIndex = guess;
          } else {
            maxIndex = guess;
          }
        }
        return maxIndex;
      };
    }());
    this.x = x;
    this.y = y;
    this.lastIndex = x.length - 1;
    // Given an x value (x2), return the expected y2 value:
    // (x1,y1) is the known point before given value,
    // (x3,y3) is the known point after given value.
    let i1;
    let i3;

    this.interpolate = function interpolate(x2) {
      if (!x2) return 0;

      // Get the indexes of x1 and x3 (the array indexes before and after given x2):
      i3 = binarySearch(this.x, x2);
      i1 = i3 - 1;

      // We have our indexes i1 & i3, so we can calculate already:
      // y2 := ((x2−x1) × (y3−y1)) ÷ (x3−x1) + y1
      return (((x2 - this.x[i1]) * (this.y[i3] - this.y[i1])) / (this.x[i3] - this.x[i1])) + this.y[i1];
    };
    return this;
  },
  // xxx: for now i will just save one spline function to to
  getInterpolateFunction(c) {
    const swiper = this;
    if (!swiper.controller.spline) {
      swiper.controller.spline = swiper.params.loop
        ? new Controller.LinearSpline(swiper.slidesGrid, c.slidesGrid)
        : new Controller.LinearSpline(swiper.snapGrid, c.snapGrid);
    }
  },
  setTranslate(setTranslate, byController) {
    const swiper = this;
    const controlled = swiper.controller.control;
    let multiplier;
    let controlledTranslate;