geo-points-and-paths/examples/functions.js

Simple classes to handle and calculate derived properties of geographic points and paths, such as distance etc. Also allows simplification of paths and storage of multiple parameters on the points.

const geoFunctions = require('../index').geoFunctions;
const Point = require('../index').Point;
const data = require('./data');

// all geoFunctions will take Points or Point-like objects
const p1 = new Point({"lat":51.2194,"lng":-3.94915});
const p2 = {"lat":51.2192,"lng":-3.94935};
const p3 = new Point({"lat":51.2392,"lng":-3.95935});

//basic geo functions
console.log(geoFunctions.p2p(p1, p2));      // 26.270488219732563
console.log(geoFunctions.p2l(p1, p3, p2));  // -20.105464375742027

const bearingInDEGS = geoFunctions.bearing(p1, p3)
console.log(bearingInDEGS);                          // 342.1247653798634

console.log(geoFunctions.rads2degs(3.14159));        // 179.9998479605043
console.log(geoFunctions.degs2rads(180));            // 3.141592653589793


// bounding boxes
console.log(geoFunctions.boundingBox([p1, p2, p3])); //{ minLng: -3.95935,maxLng: -3.94915,minLat: 51.2192,maxLat: 51.2392}

const box = {minLat: 51, maxLat: 52, minLng: -1, maxLng: 0};
console.log(geoFunctions.isPointInBox({lat: 50.9999, lng: -0.5}, box));   //false
console.log(geoFunctions.isPointInBox({lat: 51.5001, lng: -0.5}, box));   //true

const coords = data.coords;
// console.log(coords);
console.log(geoFunctions.simplifyPath(coords, 5));
// [
//   { lat: 51.2194, lng: -3.94915 },
//   { lat: 51.219, lng: -3.95043 },
//   { lat: 51.21825, lng: -3.95132 },
//   { lat: 51.21804, lng: -3.95236 },
//   { lat: 51.21808, lng: -3.95372 },
//   { lat: 51.21769, lng: -3.95615 }
// ]