trigonometry-js/lib/index.js

Trigonometry Formulas

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
require("./numberextensions");
var Geographic;
(function (Geographic) {
    function DistanceBetween(geoCoordinate_1, geoCoordinate_2) {
        var earthRadiusKm = 6371;
        var lat1 = geoCoordinate_1.lat;
        var lat2 = geoCoordinate_2.lat;
        var lon1 = geoCoordinate_1.lng;
        var lon2 = geoCoordinate_2.lng;
        var dLat = (lat2 - lat1) * (Math.PI / 180);
        var dLon = (lon2 - lon1) * (Math.PI / 180);
        lat1 = lat1 * (Math.PI / 180);
        lat2 = lat2 * (Math.PI / 180);
        var a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
            Math.sin(dLon / 2) * Math.sin(dLon / 2) * Math.cos(lat1) * Math.cos(lat2);
        var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
        return earthRadiusKm * c;
    }
    Geographic.DistanceBetween = DistanceBetween;
})(Geographic = exports.Geographic || (exports.Geographic = {}));