Question

我想要一张大的柏林地图，你可以看到多条路线。不幸的是，DirectionsRenderer会缩放到路线，因此您必须再次手动缩小。

如何避免此行为？

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
    }
];

routes.forEach(function(route) {
    new google.maps.DirectionsService().route(route, function(body) {
        var display = new google.maps.DirectionsRenderer();

        display.setMap(map);
        display.setDirections(body);
    });
});

http://jsfiddle.net/H3GE3/2/

Answer 1

使用preserveViewport option of the DirectionsRenderer阻止自动缩放到路线，然后设置您喜欢的视口。

{preserveViewport: true}

或者，如果您愿意，可以计算路线响应边界的并集，并使地图适合该地图。

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

代码段

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"></script>

Answer 2

对于我来说，这对我有用：

  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;
       })

我不必通过setMap方法。

渲染方向时，请勿更改地图中心或缩放级别

2 个答案: