ok-tools/dist/calculate-distance.js

My personal JS tools and utilities

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.calculateDistance = void 0;
function toRadians(degrees) {
    return degrees / 180 * Math.PI;
}
/**
 * @param a
 * @param b
 * @return number Distance in meters
 */
function calculateDistance(a, b) {
    if (!a || !b || typeof a.lat !== 'number' || typeof a.lng !== 'number' || typeof b.lat !== 'number' || typeof b.lng !== 'number') {
        return NaN;
    }
    var R = 6371e3;
    var lat1 = toRadians(a.lat);
    var lat2 = toRadians(b.lat);
    var deltaLat = (lat2 - lat1);
    var deltaLng = toRadians(b.lng - a.lng);
    var stepA = Math.sin(deltaLat / 2) * Math.sin(deltaLat / 2) +
        Math.cos(lat1) * Math.cos(lat2) *
            Math.sin(deltaLng / 2) * Math.sin(deltaLng / 2);
    var c = 2 * Math.atan2(Math.sqrt(stepA), Math.sqrt(1 - stepA));
    return R * c;
}
exports.calculateDistance = calculateDistance;
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