Waypoints and custom routes

Planning a route may involve locations beyond the origin and destination. These can be used in two different ways:

• Adding Waypoints to a route. These can be stops along the way, or places that the user wants to pass by during the journey.
• Constructing a custom route from a polyline (defined as a list of supporting points). This allows users to import routes from another source or reconstruct driven paths.

Waypoints

In a more advanced navigation experience, the user may want to provide more locations through which the route should be calculated. These optional intermediate locations are known as waypoints.

The maximum allowed number of waypoints is 150.

Waypoints are defined using an array of ItineraryPoints, which is stored in the waypoints property of the Itinerary type. The Itinerary type is stored in the itinerary property of RoutePlanningOptions. Each ItineraryPoint includes: - an id property, used to synchronize between the waypoints in the input to planning (RoutePlanningOptions) and those in the output (Route). - a place property of the type Place, which includes the place’s coordinates (CLLocationCoordinate2D), plus its name and address if they are supplied.

There are two options for defining waypoints while creating RoutePlanningOptions: with just its coordinates or with detailed data as well.

To define a waypoint using only its coordinates:

.

To define a waypoint using its coordinates, address, and name:

1let amsterdamCoordinate = CLLocationCoordinate2DMake(52.3764527, 4.9062047)
2let berlinCoordinate = CLLocationCoordinate2DMake(52.5069751, 13.3631919)
3let hagueCoordinate = CLLocationCoordinate2DMake(52.078663, 4.288788)
4let hagueAddress = Address(
5    streetNumber: "70",
6    streetName: "De Perponcherstraat",
7    municipality: "Den Haag",
8    postalCode: "2518 SW",
9    country: "The Netherlands"
10)
11let haguePlace = Place(coordinate: hagueCoordinate, name: "Den Haag", address: hagueAddress)
12
13let itinerary = Itinerary(
14    origin: .init(coordinate: amsterdamCoordinate),
15    destination: .init(coordinate: berlinCoordinate),
16    waypoints: [.init(place: haguePlace)]
17)
18
19let options: RoutePlanningOptions
20do {
21    options = try .init(itinerary: itinerary)
22} catch {
23    print("Invalid planning options: \(error.localizedDescription)")
24    return
25}

RoutePlanningOptions accepts waypoints inside the Itinerary as a list of ItineraryPoint.

An ItineraryPoint can be created with a single coordinate:

let point = ItineraryPoint(coordinate: .init(latitude: 0, longitude: 1))

There is also an initializer for offering the full Place model:

let point = ItineraryPoint(place: myPlaceObject)

Route planning returns a Route array. Waypoints are included in the Route in the order they are specified in the Itinerary of the RoutePlanningOptions. When planning a route, each waypoint results in an extra leg in the response.

The Route also contains routePoints, which is array of RoutePoint. This array includes values of types Origin, Destination and Waypoint (for respective points of route). Waypoints from this array can be accessed via the waypoints property of Route.

Custom routes

The user may want to import a custom polyline and reconstruct a route based on it. The supportingPoints parameter is used for this:

• The provided sequence of supporting points is used as input for route reconstruction.
• The routeLegOptions of the RoutePlanningOptions accepts the supporting points per leg.
  • The number of items in the routeLegOptions array must match the number of legs of the route as specified by the Itinerary.
• Alternative routes are calculated using the origin point, potential waypoints, and destination point as specified by the Itinerary.
• If both minDeviationDistance and minDeviationTime are set to zero, the origin and destination points are expected to be at (or very near) the beginning and end of the reference route.
• The reference route may contain road closures, which are ignored for the calculation of travel time and traffic delay for the reference route.
• When using the Waypoints, it is essential to set the routeProgressEngine to StandaloneRouteProgressEngine for precise route progress calculation.

1let amsterdamCoordinate = CLLocationCoordinate2DMake(52.3764527, 4.9062047)
2let berlinCoordinate = CLLocationCoordinate2DMake(52.5069751, 13.3631919)
3let supportingPoints = loadSupportingPointsFromFile()
4let routeLegOptions = supportingPoints.map { RouteLegOptions(supportingPoints: $0) }
5let itinerary = Itinerary(
6    origin: .init(coordinate: amsterdamCoordinate),
7    destination: .init(coordinate: berlinCoordinate)
8)
9
10let options: RoutePlanningOptions
11do {
12    options = try .init(
13        itinerary: itinerary,
14        alternativeRoutesOptions: .init(
15            maxAlternatives: 1,
16            minDeviationDistance: .tt.meters(100),
17            minDeviationTime: .tt.seconds(10)
18        ),
19        routeLegOptions: routeLegOptions
20    )
21} catch {
22    print("Invalid planning options: \(error.localizedDescription)")
23    return
24}