如何在谷歌地图中设置缩放级别

时间:2012-07-12 14:36:58

标签: javascript google-maps google-maps-api-3

以下是我通过提供纬度和经度为谷歌地图添加标记而编写的代码。问题是我得到了一个非常高度缩放的谷歌地图。我已经尝试将缩放级别设置为1,但这对高度缩放的地图没有影响。

 <script src="http://maps.google.com/maps/api/js?v=3&sensor=false" type="text/javascript"></script>
     <script type="text/javascript">
        var icon = new google.maps.MarkerImage("http://maps.google.com/mapfiles/ms/micons/blue.png",new google.maps.Size(32, 32), new google.maps.Point(0, 0),new google.maps.Point(16, 32));
        var center = null;
        var map = null;
        var currentPopup;
        var bounds = new google.maps.LatLngBounds();
        function addMarker(lat, lng, info) {
            var pt = new google.maps.LatLng(lat, lng);
            bounds.extend(pt);
            var marker = new google.maps.Marker({
                position: pt,
                icon: icon,
                map: map
            });
            var popup = new google.maps.InfoWindow({
                content: info,
                maxWidth: 300
            });
            google.maps.event.addListener(marker, "click", function() {
                if (currentPopup != null) {
                    currentPopup.close();
                    currentPopup = null;
                }
                popup.open(map, marker);
                currentPopup = popup;
            });
            google.maps.event.addListener(popup, "closeclick", function() {
                map.panTo(center);
                currentPopup = null;
            });
        }
        function initMap() {
            map = new google.maps.Map(document.getElementById("map"), {
            center: new google.maps.LatLng(0, 0),
            zoom: 1,
            mapTypeId: google.maps.MapTypeId.ROADMAP,
            mapTypeControl: false,
            mapTypeControlOptions: {
                style: google.maps.MapTypeControlStyle.HORIZONTAL_BAR
            },
            navigationControl: true,
            navigationControlOptions: {
                style: google.maps.NavigationControlStyle.SMALL
            }
        });
        addMarker(27.703402,85.311668,'New Road');
        center = bounds.getCenter();
        map.fitBounds(bounds);

        }
</script>
</head>
<body onload="initMap()" style="margin:0px; border:0px; padding:0px;">
<div id="map"></div>
</body>
</html>

如何降低此案例的缩放级别?

6 个答案:

答案 0 :(得分:97)

下面的代码是缩放地图以适合指定的范围:

addMarker(27.703402,85.311668,'New Road');
center = bounds.getCenter();
map.fitBounds(bounds);

如果您只有1个标记并将其添加到边界,则会产生最接近的缩放:

function addMarker(lat, lng, info) {
  var pt = new google.maps.LatLng(lat, lng);
  bounds.extend(pt);
}

如果您跟踪已“添加”到地图的标记数量(或扩展边界),则只能在该数字大于1时调用fitBounds。我通常将标记推入一个数组(供以后使用)并测试该数组的长度。

如果您只有一个标记,请不要使用fitBounds。使用标记位置和所需的缩放级别调用setCentersetZoom

function addMarker(lat, lng, info) {
  var pt = new google.maps.LatLng(lat, lng);
  map.setCenter(pt);
  map.setZoom(your desired zoom);
}

答案 1 :(得分:16)

答案 2 :(得分:12)

要将地图缩放两级,只需添加此小行代码即可 map.setZoom(map.getZoom() + 2);

答案 3 :(得分:12)

您要查找的是每个缩放级别的比例。数字以米为单位。使用这些:

20:1128.497220

19:2256.994440

18:4513.988880

17:9027.977761

16:18055.955520

15:36111.911040

14:72223.822090

13:144447.644200

12:288895.288400

11:577790.576700

10:1155581.153000

9:2311162.307000

8:4622324.614000

7:9244649.227000

6:18489298.450000

5:36978596.910000

4:73957193.820000

3:147914387.600000

2:295828775.300000

1:591657550.500000

答案 4 :(得分:5)

这是我使用的功能:

var map =  new google.maps.Map(document.getElementById('map'), {
            center: new google.maps.LatLng(52.2, 5),
            mapTypeId: google.maps.MapTypeId.ROADMAP,
            zoom: 7
        });

function zoomTo(level) {
        google.maps.event.addListener(map, 'zoom_changed', function () {
            zoomChangeBoundsListener = google.maps.event.addListener(map, 'bounds_changed', function (event) {
                if (this.getZoom() > level && this.initialZoom == true) {
                    this.setZoom(level);
                    this.initialZoom = false;
                }
                google.maps.event.removeListener(zoomChangeBoundsListener);
            });
        });
    }

答案 5 :(得分:0)

这些方法对我有用,可能对任何人都有用: MapOptions interface

设置最小缩放: mMap.setMinZoomPreference(N);

设置最大变焦: mMap.setMaxZoomPreference(N);

其中N可以等于:

20:1128.497220

19:2256.999440

18:4513.998880

17:9029.79771

16:18055.955520

15:36111.911040

14:72223.822090

13:144447.644200

12:288895.288400

11:577790.576700

10:1155581.153000

9:2311162.307000

8:4622324.614000

7:9244649.227000

6:18489298.450000

5:36978596.910000

4:73957193.820000

3:147914387.600000

2:295828775.300000

1:591657550.500000