Angular Gmaps Directions service.

gmaps-directions.js

/**
 * Initialize Directions Service
 *
 * @param {Object} origin - The latitude & longitude of origin point
 */
function _InitializeGmapsDirections(origin) {

    // Set map zoom base on markers
    var _SetMapZoom = function (positionList) {

        var bounds = new google.maps.LatLngBounds();
        var map = vm.gmaps.control.getGMap();

        for (var i = 0, limit = positionList.length; i < limit; ++i) {
            bounds.extend(new google.maps.LatLng(positionList[i].latitude, positionList[i].longitude));
        }

        // Fit the markers on the map.
        map.fitBounds(bounds);

    };

    var destination = angular.copy(vm.branch.Location);
    var directionsService = new google.maps.DirectionsService();
    var directionsDisplay = new google.maps.DirectionsRenderer();
        directionsDisplay.setOptions({ suppressMarkers: true });
        directionsDisplay.setMap(vm.gmaps.control.getGMap());

    var request = {
        origin: origin.latitude + ',' + origin.longitude,
        destination: destination.latitude + ',' + destination.longitude,
        travelMode: google.maps.TravelMode.DRIVING,
        unitSystem: google.maps.UnitSystem.METRIC
    };

    direction = {
        saddr: request.origin,
        daddr: request.destination
    };

    // Request direction in Gmaps API
    directionsService.route(request, function (response, status) {

        console.log('Done');

        // If a route is found then render on map.
        // Else, display hearing centre on map.
        if (status === google.maps.DirectionsStatus.OK) {
            _SetMarker(origin, 'origin');
            _SetMarker(destination, 'destination');

            directionsDisplay.setDirections(response);
            _SetMapZoom([origin, destination]);
        } else {
            console.info('No direction(s) found for this location.');
            _SetMarker(vm.branch.Location, 'destination');
        }

    });

    vm.isMapRendered = true;

}