その他の交通機能

func enableTrafficVisualization() {    
    do {
        // Set the traffic flow refresh period to 5 * 60 seconds (5 minutes).
        // If MapFeatures.trafficFlow is disabled, no requests are made.
        //
        // Note: This code initiates periodic calls to the HERE Traffic backend. Depending on your contract,
        // each call may be charged separately. It is the application's responsibility to decide how
        // often this code should be executed.
        try MapContentSettings.setTrafficRefreshPeriod(5 * 60.0)
    } catch let error as MapContentSettings.TrafficRefreshPeriodError {
        print("TrafficRefreshPeriodError: \(error)")
    } catch {
        print("An unexpected error occurred: \(error)")
    }

    // Once these layers are added to the map, they will be automatically updated while panning the map.
    mapView.mapScene.enableFeatures([MapFeatures.trafficFlow : MapFeatureModes.trafficFlowWithFreeFlow])
    // MapFeatures.trafficIncidents renders traffic icons and lines to indicate the location of incidents.
    mapView.mapScene.enableFeatures([MapFeatures.trafficIncidents: MapFeatureModes.defaultMode])
}

mapView.mapScene.disableFeatures([MapFeatures.trafficFlow, MapFeatures.trafficIncidents])

// Conforming to TapDelegate protocol.
func onTap(origin: Point2D) {
    // Can be nil when the map was tilted and the sky was tapped.
    if let touchGeoCoords = mapView.viewToGeoCoordinates(viewCoordinates: origin) {
        tappedGeoCoordinates = touchGeoCoords

        // Pick incidents that are shown in trafficIncidents.
        pickTrafficIncident(touchPointInPixels: origin)
    }
}

// Traffic incidents can only be picked, when trafficIncidents is visible.
func pickTrafficIncident(touchPointInPixels: Point2D) {
    let originInPixels = Point2D(x: touchPointInPixels.x, y: touchPointInPixels.y)
    let sizeInPixels = Size2D(width: 1, height: 1)
    let rectangle = Rectangle2D(origin: originInPixels, size: sizeInPixels)

    mapView.pickMapContent(inside: rectangle, completion: onPickMapContent)
}

// MapViewBase.PickMapContentHandler to receive picked map content.
func onPickMapContent(mapContentResult: PickMapContentResult?) {
    if mapContentResult == nil {
        // An error occurred while performing the pick operation.
        return
    }

    let trafficIncidents = mapContentResult!.trafficIncidents
    if trafficIncidents.count == 0 {
        print("No traffic incident found at picked location")
    } else {
        print("Picked at least one incident.")
        let firstIncident = trafficIncidents.first!
        showDialog(title: "Traffic incident picked:", message: "Type: \(firstIncident.type.rawValue)")

        // Find more details by looking up the ID via TrafficEngine.
        findIncidentByID(firstIncident.originalId)
    }

    // Optionally, look for more map content like embedded POIs.
}

func findIncidentByID(_ originalId: String) {
    let trafficIncidentsLookupOptions = TrafficIncidentLookupOptions()
    // Optionally, specify a language:
    // the language of the country where the incident occurs is used.
    // trafficIncidentsLookupOptions.languageCode = LanguageCode.EN_US
    trafficEngine.lookupIncident(with: originalId,
                                 lookupOptions: trafficIncidentsLookupOptions,
                                 completion: onTrafficIncidentCompletion)
}

// TrafficIncidentCompletionHandler to receive traffic incidents from ID.
func onTrafficIncidentCompletion(trafficQueryError: TrafficQueryError?, trafficIncident: TrafficIncident?) {
    if trafficQueryError == nil {
        print("Fetched TrafficIncident from lookup request." +
                " Description: " + trafficIncident!.description.text)
    } else {
        showDialog(title: "TrafficLookupError:", message: trafficQueryError.debugDescription)
    }
}