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Obtenir un itinéraire

Vous pouvez obtenir un itinéraire à l'aide de l'API Routes : en envoyant une requête HTTP POST computeRoutes (REST) ou par en appelant la méthode ComputeRoutes (gRPC).

L'exemple suivant montre l'URL d'une requête REST envoyée à computeRoutes méthode:

https://routes.googleapis.com/directions/v2:computeRoutes

Inclure les options de requête dans le fichier JSON corps de la requête. Le corps de la requête contient les emplacements source et de destination, ainsi que d'éventuelles options. que vous souhaitez définir sur l'itinéraire. Pour plus d'informations, consultez la section Spécifier des emplacements et Options d'itinéraire disponibles.

La réponse contient les champs que vous avez spécifiés dans le masque de champ de réponse à l'aide du paramètre d'URL $fields ou des informations field à l'aide de la méthode En-tête HTTP gRPC X-Goog-FieldMask. Pour en savoir plus, consultez Sélectionnez les informations à renvoyer.

Pour obtenir un exemple de requête d'itinéraire en transports en commun, consultez Exemple: Obtenir un itinéraire en transports en commun.

Exemple: Requête de routage HTTP

Le code suivant montre comment construire un corps de requête pour une computeRoutes requête. Dans cet exemple, vous définissez les emplacements source et de destination, également spécifier:

travelMode de DRIVE et itinéraire en voiture tenant compte du trafic.
Langue en-US avec des unités de distance imperial.
Un masque de champ de réponse dans l'en-tête X-Goog-FieldMask qui spécifie pour renvoyer les champs suivants dans la réponse:
- routes.duration
- routes.distanceMeters
- routes.polyline.encodedPolyline

curl -X POST -d '{
  "origin":{
    "location":{
      "latLng":{
        "latitude": 37.419734,
        "longitude": -122.0827784
      }
    }
  },
  "destination":{
    "location":{
      "latLng":{
        "latitude": 37.417670,
        "longitude": -122.079595
      }
    }
  },
  "travelMode": "DRIVE",
  "routingPreference": "TRAFFIC_AWARE",
  "computeAlternativeRoutes": false,
  "routeModifiers": {
    "avoidTolls": false,
    "avoidHighways": false,
    "avoidFerries": false
  },
  "languageCode": "en-US",
  "units": "IMPERIAL"
}' \
-H 'Content-Type: application/json' -H 'X-Goog-Api-Key: YOUR_API_KEY' \
-H 'X-Goog-FieldMask: routes.duration,routes.distanceMeters,routes.polyline.encodedPolyline' \
'https://routes.googleapis.com/directions/v2:computeRoutes'

Exemple: corps de la réponse de route HTTP

L'appel ci-dessus génère la réponse JSON suivante:

{
  "routes": [
    {
      "distanceMeters": 772,
      "duration": "165s",
      "polyline": {
        "encodedPolyline": "ipkcFfichVnP@j@BLoFVwM{E?"
      }
    }
  ]
}

Exemple: Requête gRPC

gRPC est un RPC universel Open Source hautes performances développé par Google. Dans gRPC, une application cliente peut appeler directement sur une application serveur sur une machine différente, comme s'il s'agissait d'une application .

Vous trouverez ci-dessous un exemple de requête gRPC.

Go

package main

import (
  "context"
  "crypto/tls"
  "fmt"
  "log"
  "time"

  routespb "google.golang.org/genproto/googleapis/maps/routing/v2"
  "google.golang.org/genproto/googleapis/type/latlng"
  "google.golang.org/grpc"
  "google.golang.org/grpc/credentials"
  "google.golang.org/grpc/metadata"
)

const (
  fieldMask  = "*"
  apiKey     = "INSERT_API_KEY_HERE"
  serverAddr = "routes.googleapis.com:443"
)

func main() {
  config := tls.Config{}
  conn, err := grpc.Dial(serverAddr,
      grpc.WithTransportCredentials(credentials.NewTLS(&config)))
  if err != nil {
      log.Fatalf("Failed to connect: %v", err)
  }
  defer conn.Close()
  client := routespb.NewRoutesClient(conn)
  ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
  ctx = metadata.AppendToOutgoingContext(ctx, "X-Goog-Api-Key", apiKey)
  ctx = metadata.AppendToOutgoingContext(ctx, "X-Goog-Fieldmask", fieldMask)
  defer cancel()

  // create the origin using a latitude and longitude
  origin := &routespb.Waypoint{
      LocationType: &routespb.Waypoint_Location{
          Location: &routespb.Location{
              LatLng: &latlng.LatLng{
                  Latitude:  37.417670,
                  Longitude: -122.0827784,
              },
          },
      },
  }

  // create the destination using a latitude and longitude
  destination := &routespb.Waypoint{
      LocationType: &routespb.Waypoint_Location{
          Location: &routespb.Location{
              LatLng: &latlng.LatLng{
                  Latitude:  37.417670,
                  Longitude: -122.079595,
              },
          },
      },
  }
  req := &routespb.ComputeRoutesRequest{
      Origin:                   origin,
      Destination:              destination,
      TravelMode:               routespb.RouteTravelMode_DRIVE,
      RoutingPreference:        routespb.RoutingPreference_TRAFFIC_AWARE,
      ComputeAlternativeRoutes: true,
      Units:                    routespb.Units_METRIC,
      RouteModifiers: &routespb.RouteModifiers{
          AvoidTolls:    false,
          AvoidHighways: true,
          AvoidFerries:  true,
      },
      PolylineQuality: routespb.PolylineQuality_OVERVIEW,
  }

  // execute rpc
  resp, err := client.ComputeRoutes(ctx, req)

  if err != nil {
      // "rpc error: code = InvalidArgument desc = Request contains an invalid
      // argument" may indicate that your project lacks access to Routes
      log.Fatal(err)
  }

  fmt.Printf("Response: %v", resp)

}

Java


package com.example;

import com.google.maps.routing.v2.*;
import com.google.type.LatLng;
import io.grpc.CallOptions;
import io.grpc.Channel;
import io.grpc.ClientCall;
import io.grpc.ClientInterceptor;
import io.grpc.ClientInterceptors;
import io.grpc.ForwardingClientCall;
import io.grpc.Metadata;
import io.grpc.MethodDescriptor;
import io.grpc.StatusRuntimeException;
import io.grpc.netty.NettyChannelBuilder;
import java.util.Iterator;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;

public class RoutesClient {
   // For more detail on inserting API keys, see:
   // https://cloud.google.com/endpoints/docs/grpc/restricting-api-access-with-api-keys#java
   // For more detail on system parameters (such as FieldMask), see:
   // https://cloud.google.com/apis/docs/system-parameters
   private static final class RoutesInterceptor implements ClientInterceptor {
       private final String apiKey;
       private static final Logger logger = Logger.getLogger(RoutesInterceptor.class.getName());
       private static Metadata.Key<String> API_KEY_HEADER = Metadata.Key.of("x-goog-api-key",
               Metadata.ASCII_STRING_MARSHALLER);
       private static Metadata.Key<String> FIELD_MASK_HEADER = Metadata.Key.of("x-goog-fieldmask",
               Metadata.ASCII_STRING_MARSHALLER);

       public RoutesInterceptor(String apiKey) {
           this.apiKey = apiKey;
       }

       @Override
       public <ReqT, RespT> ClientCall<ReqT, RespT> interceptCall(MethodDescriptor<ReqT, RespT> method,
               CallOptions callOptions, Channel next) {
           logger.info("Intercepted " + method.getFullMethodName());
           ClientCall<ReqT, RespT> call = next.newCall(method, callOptions);
           call = new ForwardingClientCall.SimpleForwardingClientCall<ReqT, RespT>(call) {
               @Override
               public void start(Listener<RespT> responseListener, Metadata headers) {
                   headers.put(API_KEY_HEADER, apiKey);
                   // Note that setting the field mask to * is OK for testing, but discouraged in
                   // production.
                   // For example, for ComputeRoutes, set the field mask to
                   // "routes.distanceMeters,routes.duration,routes.polyline.encodedPolyline"
                   // in order to get the route distances, durations, and encoded polylines.
                   headers.put(FIELD_MASK_HEADER, "*");
                   super.start(responseListener, headers);
               }
           };
           return call;
       }
   }

   private static final Logger logger = Logger.getLogger(RoutesClient.class.getName());
   private final RoutesGrpc.RoutesBlockingStub blockingStub;

   public RoutesClient(Channel channel) {
       blockingStub = RoutesGrpc.newBlockingStub(channel);
   }

   public static Waypoint createWaypointForLatLng(double lat, double lng) {
       return Waypoint.newBuilder()
               .setLocation(Location.newBuilder().setLatLng(LatLng.newBuilder().setLatitude(lat).setLongitude(lng)))
               .build();
   }

   public void computeRoutes() {
       ComputeRoutesRequest request = ComputeRoutesRequest.newBuilder()
               .setOrigin(createWaypointForLatLng(37.420761, -122.081356))
               .setDestination(createWaypointForLatLng(37.420999, -122.086894)).setTravelMode(RouteTravelMode.DRIVE)
               .setRoutingPreference(RoutingPreference.TRAFFIC_AWARE).setComputeAlternativeRoutes(true)
               .setRouteModifiers(
                       RouteModifiers.newBuilder().setAvoidTolls(false).setAvoidHighways(true).setAvoidFerries(true))
               .setPolylineQuality(PolylineQuality.OVERVIEW).build();
       ComputeRoutesResponse response;
       try {
           logger.info("About to send request: " + request.toString());
           response = blockingStub.withDeadlineAfter(2000, TimeUnit.MILLISECONDS).computeRoutes(request);
       } catch (StatusRuntimeException e) {
           logger.log(Level.WARNING, "RPC failed: {0}", e.getStatus());
           return;
       }
       logger.info("Response: " + response.toString());
   }

   public void computeRouteMatrix() {
       ComputeRouteMatrixRequest request = ComputeRouteMatrixRequest.newBuilder()
               .addOrigins(RouteMatrixOrigin.newBuilder().setWaypoint(createWaypointForLatLng(37.420761, -122.081356))
                       .setRouteModifiers(RouteModifiers.newBuilder().setAvoidTolls(false).setAvoidHighways(true)
                               .setAvoidFerries(true)))
               .addOrigins(RouteMatrixOrigin.newBuilder().setWaypoint(createWaypointForLatLng(37.403184, -122.097371)))
               .addDestinations(RouteMatrixDestination.newBuilder()
                       .setWaypoint(createWaypointForLatLng(37.420999, -122.086894)))
               .addDestinations(RouteMatrixDestination.newBuilder()
                       .setWaypoint(createWaypointForLatLng(37.383047, -122.044651)))
               .setTravelMode(RouteTravelMode.DRIVE).setRoutingPreference(RoutingPreference.TRAFFIC_AWARE).build();
       Iterator<RouteMatrixElement> elements;
       try {
           logger.info("About to send request: " + request.toString());
           elements = blockingStub.withDeadlineAfter(2000, TimeUnit.MILLISECONDS).computeRouteMatrix(request);
       } catch (StatusRuntimeException e) {
           logger.log(Level.WARNING, "RPC failed: {0}", e.getStatus());
           return;
       }

       while (elements.hasNext()) {
           logger.info("Element response: " + elements.next().toString());
       }
   }

   public static void main(String[] args) throws Exception {
       String apiKey = System.getenv("INSERT_API_KEY_HERE");

       // The standard TLS port is 443
       Channel channel = NettyChannelBuilder.forAddress("routes.googleapis.com", 443).build();
       channel = ClientInterceptors.intercept(channel, new RoutesInterceptor(apiKey));

       RoutesClient client = new RoutesClient(channel);
       client.computeRoutes();
       client.computeRouteMatrix();
   }
}

C#

Pour obtenir un exemple avec C#, consultez Google.Maps.Routing.V2.

Node.js

const protoPath = "YOUR_PROTO_PATH";
const grpc = require("@grpc/grpc-js");
const protoLoader = require("@grpc/proto-loader");
const packageDefinition = protoLoader.loadSync(protoPath, {
  keepCase: true,
  longs: String,
  enums: String,
  defaults: true,
  oneofs: true,
});
const protoDescriptor =
  grpc.loadPackageDefinition(packageDefinition).google.maps.routing.v2;
const metadata = new grpc.Metadata();
const host = "routes.googleapis.com:443";
const apiKey = "YOUR_API_KEY";
const fieldMask = "*";
let ComputeRoutesRequest = {
  origin: {
    location: {
      lat_lng: {
        latitude: -37.816,
        longitude: 144.964,
      },
    },
  },
  destination: {
    location: {
      lat_lng: {
        latitude: -37.815,
        longitude: 144.966,
      },
    },
  },
  routing_preference: "TRAFFIC_AWARE",
  travel_mode: "DRIVE",
};
const ssl_creds = grpc.credentials.createSsl();
const call_creds = grpc.credentials.createFromMetadataGenerator(
  function (args, callback) {
    metadata.set("X-Goog-Api-Key", apiKey);
    metadata.set("X-Goog-Fieldmask", fieldMask);
    metadata.set("Content-Type", "application/json");
    callback(null, metadata);
  },
);
const credentials = grpc.credentials.combineChannelCredentials(
  ssl_creds,
  call_creds,
);
const client = new protoDescriptor.Routes(host, credentials);
client.ComputeRoutes(ComputeRoutesRequest, (error, response) => {
  if (error) {
    console.log(error);
    return;
  } else if (response) {
    console.log(response);
  }
});