atriusmaps-node-sdk/dist/cjs/src/utils/geodesy.js

This project provides an API to Atrius Personal Wayfinder maps within a Node environment. See the README.md for more information

'use strict';

const toRadians = (d) => d * Math.PI / 180;
function distance(lat1, lng1, lat2, lng2) {
  const R = 6371e3;
  const \u03C61 = toRadians(lat1);
  const \u03C62 = toRadians(lat2);
  const \u0394\u03C6 = toRadians(lat2 - lat1);
  const \u0394\u03BB = toRadians(lng2 - lng1);
  const a = Math.sin(\u0394\u03C6 / 2) * Math.sin(\u0394\u03C6 / 2) + Math.cos(\u03C61) * Math.cos(\u03C62) * Math.sin(\u0394\u03BB / 2) * Math.sin(\u0394\u03BB / 2);
  const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
  return R * c;
}
function bearingToDirection(deg, T) {
  const names = [
    T("wayfinder:north"),
    // 0
    T("wayfinder:northeast"),
    // 45
    T("wayfinder:east"),
    // 90
    T("wayfinder:southeast"),
    // 135
    T("wayfinder:south"),
    // 180 / -180
    T("wayfinder:southwest"),
    // -135
    T("wayfinder:west"),
    // -90
    T("wayfinder:northwest")
    // -45
  ];
  const d = (deg + 180) % 360 - 180;
  const index = Math.round(d / 45);
  return names[(index + 8) % 8];
}

exports.bearingToDirection = bearingToDirection;
exports.distance = distance;
exports.toRadians = toRadians;