Do not change map center or zoom level when rendering directions

Question

I want to have a large map of berlin from which you see multiple routes. Unfortunately a DirectionsRenderer zooms to the route so you have to manually zoom out again.

Answer 1

Use the preserveViewport option of the DirectionsRenderer to prevent the automatic zoom to the route, then set the viewport you like.

{preserveViewport: true}

Or if you want, calculate the union of the bounds of the directions responses, and fit the map to that.

var bounds = new google.maps.LatLngBounds();
routes.forEach(function(route) {
    new google.maps.DirectionsService().route(route, function(body) {
        var display = new google.maps.DirectionsRenderer({preserveViewport: true});

        display.setMap(map);
        display.setDirections(body);
        bounds.union(body.routes[0].bounds);
        map.fitBounds(bounds);
    });
});

proof of concept fiddle

code snippet:

var $canvas = document.querySelector('#map');

var map = new google.maps.Map($canvas, {
  center: new google.maps.LatLng(52.46004869999999, 13.37898690),
  mapTypeId: google.maps.MapTypeId.ROADMAP,
  zoom: 14
});

var routes = [{
    origin: new google.maps.LatLng(52.459281, 13.356367),
    destination: new google.maps.LatLng(52.455833, 13.322948),
    travelMode: google.maps.TravelMode.BICYCLING
  },
  {
    origin: new google.maps.LatLng(52.597621, 13.430536),
    destination: new google.maps.LatLng(52.5918799, 13.2832929),
    travelMode: google.maps.TravelMode.BICYCLING
  }
];
var bounds = new google.maps.LatLngBounds();
routes.forEach(function(route) {
  new google.maps.DirectionsService().route(route, function(body) {
    var display = new google.maps.DirectionsRenderer({
      preserveViewport: true
    });

    display.setMap(map);
    display.setDirections(body);
    bounds.union(body.routes[0].bounds);
    map.fitBounds(bounds);
  });
});

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

<div id="map"></div>
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>

Answer 2

In my case, this worked for me:

  let directionsService = new google.maps.DirectionsService();
        // always pass the `preserveViewport` to maintain the zoom ratio when using directionsRenderer
       let directionsRenderer = new google.maps.DirectionsRenderer({map:this.map,preserveViewport: true});
        //store the request state in an object ` use 'google.maps.TravelMode.DRIVING' instead of 'DRIVING'`
        var request = {
          origin: {query:start},
          destination: {query:end},
          travelMode: google.maps.TravelMode.DRIVING,
        };
        directionsService.route(request, function (response, status) {
         directionsRenderer.setDirections(response);
          // const route = request.routes;
       })

i didn't have to pass the setMap method.