Google Maps API V3: comment montrer la direction d'un point A au point B (Ligne Bleue)?

Utiliser Javascript

J'ai créé une démo de travail qui montre comment utiliser le service Google Maps API Directions en Javascript via un

• DirectionsService objet pour envoyer et recevoir des demandes de direction
• DirectionsRenderer objet pour rendre l'itinéraire retourné sur la carte

function initMap() {
  var pointA = new google.maps.LatLng(51.7519, -1.2578),
    pointB = new google.maps.LatLng(50.8429, -0.1313),
    myOptions = {
      zoom: 7,
      center: pointA
    },
    map = new google.maps.Map(document.getElementById('map-canvas'), myOptions),
    // Instantiate a directions service.
    directionsService = new google.maps.DirectionsService,
    directionsDisplay = new google.maps.DirectionsRenderer({
      map: map
    }),
    markerA = new google.maps.Marker({
      position: pointA,
      title: "point A",
      label: "A",
      map: map
    }),
    markerB = new google.maps.Marker({
      position: pointB,
      title: "point B",
      label: "B",
      map: map
    });

  // get route from A to B
  calculateAndDisplayRoute(directionsService, directionsDisplay, pointA, pointB);

}



function calculateAndDisplayRoute(directionsService, directionsDisplay, pointA, pointB) {
  directionsService.route({
    origin: pointA,
    destination: pointB,
    travelMode: google.maps.TravelMode.DRIVING
  }, function(response, status) {
    if (status == google.maps.DirectionsStatus.OK) {
      directionsDisplay.setDirections(response);
    } else {
      window.alert('Directions request failed due to ' + status);
    }
  });
}

initMap();

    html,
    body {
      height: 100%;
      margin: 0;
      padding: 0;
    }
    #map-canvas {
      height: 100%;
      width: 100%;
    }

<script src="https://maps.googleapis.com/maps/api/js?sensor=false"></script>

<div id="map-canvas"></div>

Aussi sur Jsfiddle: http://jsfiddle.net/user2314737/u9no8te4/

Utilisation Des Services Web Google Maps

Vous pouvez utiliser les services Web utilisation D'une API_KEY émettant une requête comme ceci:

Https://maps.googleapis.com/maps/api/directions/json?origin=Toronto&destination=Montreal&key=API_KEY

Un API_KEY peut être obtenu dans la console Google Developer avec un quota de 2500 requêtes gratuites / jour.

Une requête peut renvoyer des résultats JSON ou XML qui peuvent être utilisés pour dessiner un chemin sur une carte.

La documentation officielle pour les services Web utilisant L'API Google Maps Directions sont ici

Dans votre cas, voici une implémentation utilisant directions service .

function displayRoute() {

    var start = new google.maps.LatLng(28.694004, 77.110291);
    var end = new google.maps.LatLng(28.72082, 77.107241);

    var directionsDisplay = new google.maps.DirectionsRenderer();// also, constructor can get "DirectionsRendererOptions" object
    directionsDisplay.setMap(map); // map should be already initialized.

    var request = {
        origin : start,
        destination : end,
        travelMode : google.maps.TravelMode.DRIVING
    };
    var directionsService = new google.maps.DirectionsService(); 
    directionsService.route(request, function(response, status) {
        if (status == google.maps.DirectionsStatus.OK) {
            directionsDisplay.setDirections(response);
        }
    });
}

Utilisez l'API directions .

Faire un appel ajax c'est à dire

https://maps.googleapis.com/maps/api/directions/json?parameters

Puis analysez la réponse

  // First Initiate your map. Tie it to some ID in the HTML eg. 'MyMapID'
  var map = new google.maps.Map(
    document.getElementById('MyMapID'),
    {
      center: {
        lat: Some.latitude,
        lng: Some.longitude
      }
    }
  );
  // Create a new directionsService object.
  var directionsService = new google.maps.DirectionsService;
    directionsService.route({
      origin: origin.latitude +','+ origin.longitude,
      destination: destination.latitude +','+ destination.longitude,
      travelMode: 'DRIVING',
    }, function(response, status) {
      if (status === google.maps.DirectionsStatus.OK) {
        var directionsDisplay = new google.maps.DirectionsRenderer({
          suppressMarkers: true,
          map: map,
          directions: response,
          draggable: false,
          suppressPolylines: true, 
          // IF YOU SET `suppressPolylines` TO FALSE, THE LINE WILL BE
          // AUTOMATICALLY DRAWN FOR YOU.
        });

        // IF YOU WISH TO APPLY USER ACTIONS TO YOUR LINE YOU NEED TO CREATE A 
        // `polyLine` OBJECT BY LOOPING THROUGH THE RESPONSE ROUTES AND CREATING A 
        // LIST
        pathPoints = response.routes[0].overview_path.map(function (location) {
          return {lat: location.lat(), lng: location.lng()};
        });

        var assumedPath = new google.maps.Polyline({
         path: pathPoints, //APPLY LIST TO PATH
         geodesic: true,
         strokeColor: '#708090',
         strokeOpacity: 0.7,
         strokeWeight: 2.5
       });

       assumedPath.setMap(map); // Set the path object to the map