渲染方向时,请勿更改地图中心或缩放级别

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.

我该如何避免这种行为？

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DirectionsRenderer的preserveViewport选项阻止自动缩放到路径,然后设置您喜欢的视口.

{preserveViewport: true}

或者,如果需要,计算方向响应边界的并集,并使地图适合该方法.

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);
    });
});

概念证明小提琴

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>