@webilix/helper-library/dist/lib/helpers/geo.js

JavaScript/TypeScript programming helper library.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.GEO = void 0;
function coordinates() {
    return new Promise((resolve, reject) => {
        try {
            if (!navigator || !navigator.geolocation) {
                reject('Geolocation is not supported by this browser.');
                return;
            }
            navigator.geolocation.getCurrentPosition((response) => resolve({
                latitude: response.coords.latitude,
                longitude: response.coords.longitude,
            }), (err) => reject(err.message));
        }
        catch (e) {
            reject(e.message || 'navigator is not defined');
        }
    });
}
function distance(from, to) {
    const R = 6371e3; // metres
    const φ1 = (from.latitude * Math.PI) / 180; // φ, λ in radians
    const φ2 = (to.latitude * Math.PI) / 180;
    const Δφ = ((to.latitude - from.latitude) * Math.PI) / 180;
    const Δλ = ((to.longitude - from.longitude) * Math.PI) / 180;
    const a = Math.sin(Δφ / 2) * Math.sin(Δφ / 2) + Math.cos(φ1) * Math.cos(φ2) * Math.sin(Δλ / 2) * Math.sin(Δλ / 2);
    const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
    return Math.round(R * c); // in metres
}
function routeLength(route) {
    const parts = [];
    route.forEach((coordinates, index) => {
        if (index === 0)
            return;
        const from = route[index - 1];
        const to = coordinates;
        parts.push({ from, to, length: distance(from, to) });
    });
    return {
        length: parts.reduce((sum, p) => sum + p.length, 0),
        parts,
    };
}
exports.GEO = {
    coordinates,
    distance,
    routeLength,
};
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