根据标记缩放和居中Google地图(JavaScript API V3)

时间:2010-08-19 10:24:35

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

我认为标题已经足够了,我甚至不知道如何为V2和V1 API做到这一点:/

谢谢:)

4 个答案:

答案 0 :(得分:74)

正如其他答案所示,fitBounds()方法应该可以解决问题。

考虑以下示例,它将在美国东北部生成10个随机点,并应用fitBounds()方法:

<!DOCTYPE html>
<html> 
<head> 
   <meta http-equiv="content-type" content="text/html; charset=UTF-8"/> 
   <title>Google Maps LatLngBounds.extend() Demo</title> 
   <script src="http://maps.google.com/maps/api/js?sensor=false" 
           type="text/javascript"></script> 
</head> 
<body> 
   <div id="map" style="width: 400px; height: 300px;"></div> 

   <script type="text/javascript"> 

   var map = new google.maps.Map(document.getElementById('map'), { 
     mapTypeId: google.maps.MapTypeId.TERRAIN
   });

   var markerBounds = new google.maps.LatLngBounds();

   var randomPoint, i;

   for (i = 0; i < 10; i++) {
     // Generate 10 random points within North East USA
     randomPoint = new google.maps.LatLng( 39.00 + (Math.random() - 0.5) * 20, 
                                          -77.00 + (Math.random() - 0.5) * 20);

     // Draw a marker for each random point
     new google.maps.Marker({
       position: randomPoint, 
       map: map
     });

     // Extend markerBounds with each random point.
     markerBounds.extend(randomPoint);
   }

   // At the end markerBounds will be the smallest bounding box to contain
   // our 10 random points

   // Finally we can call the Map.fitBounds() method to set the map to fit
   // our markerBounds
   map.fitBounds(markerBounds);

   </script> 
</body> 
</html>

多次刷新此示例,没有标记出现在视口之外:

fitBounds demo

答案 1 :(得分:7)

这是方法:

map.fitBounds(bounds);
map.setCenter(bounds.getCenter());

bounds是坐标(标记)的数组。每次放置标记时都会执行以下操作:

bounds.extend(currLatLng);

答案 2 :(得分:1)

中心缩放取决于单个标记

var myCenter=new google.maps.LatLng(38.8106813,-89.9600172);
var map;
var marker;
var mapProp;
function initialize()
{
    mapProp = {
        center:myCenter,
        zoom:8,
        mapTypeId:google.maps.MapTypeId.ROADMAP
    };

    map=new google.maps.Map(document.getElementById("map"),mapProp);

    marker=new google.maps.Marker({
        position:myCenter,
        animation:google.maps.Animation.BOUNCE,
        title:"400 St. Louis Street Edwardsville, IL 62025"
    });

    marker.setMap(map);
    google.maps.event.addListener(map, "zoom_changed", function() {
        map.setCenter(myCenter);
    });
}

google.maps.event.addDomListener(window, 'load', initialize);

答案 3 :(得分:0)

计算右缩放以显示所有标记并非易事。但是有一个函数:GMap.fitBounds() - 你定义一个边界(例如,你所有标记坐标的最极端点)并相应地设置地图。参见例如fitbounds() in Google maps api V3 does not fit bounds(答案!)是一个很好的例子。