/// <summary>
/// Computes an overview of the driving route between two points using
/// the Google Directions API.
/// </summary>
/// <exception cref="ApplicationException">Thrown if the Google Maps service
/// does not return a route for any reason.</exception>
/// <returns>The route info.</returns>
/// <param name="apiKey">Google API key.</param>
/// <param name="origin">Origin.</param>
/// <param name="destination">Destination.</param>
/// <param name="waypoints">Waypoints to visit.</param>
public static async Task <RouteInfo> ComputeApproximateDrivingInfo(
string apiKey,
GeoCoordinates origin,
GeoCoordinates destination,
params GeoCoordinates[] waypoints)
{
DirectionRequest request = new DirectionRequest
{
Origin = origin.ToGoogleLatLng(),
Destination = destination.ToGoogleLatLng(),
Mode = TravelMode.driving,
Waypoints = waypoints.Length == 0 ?
null : new List <Location>(waypoints.Select(pt => new LatLng(pt.Latitude, pt.Longitude)))
};
DirectionRoute route = await GetRouteOrThrow(apiKey, request);
return(new RouteInfo(
route.OverviewPolyline.ToGeoPolyline(),
TimeSpan.FromSeconds(
route.Legs.Sum(leg => leg.Duration.Value))));
}
