如何在Google Maps JS API中获取仍包含一组纬度/经度坐标的最小LatLngBounds？ [英] How can I get the smallest LatLngBounds that still contains a set of Lat/Long Coordinates in Google Maps JS API?
问题描述
我需要在地图上绘制一组坐标以响应用户的选择，当它发生时，我想平移地图以关注这组点。我怎样才能找到包含所有坐标的最小边界框（LatLngBounds）？
除 Stack Overflow post @Crescent Fresh （使用v2 API）时，您希望使用的方法是 LatLngBounds.extend（） 。
下面是一个完整的示例，使用 v3 API ：
<！DOCTYPE html>
< html>
< head>
< meta http-equiv =content-typecontent =text / html; charset = UTF-8/>
< title> Google地图LatLngBounds.extend（）演示< / title>
< script src =http://maps.google.com/maps/api/js?sensor=false
type =text / javascript>< / script>
< / head>
< body>
< div id =mapstyle =width：400px; height：300px;>< / div>
< script type =text / javascript>
var map = new google.maps.Map（document.getElementById（'map'），{$ b $ mapTypeId：google.maps.MapTypeId.TERRAIN
}）;
var markerBounds = new google.maps.LatLngBounds（）;
var randomPoint，i;
（i = 0; i <10; i ++）{
//在东北美洲生成10个随机点
randomPoint = new google.maps.LatLng（39.00 +（Math.random（） - 0.5）* 20，
-77.00 +（Math.random（） - 0.5）* 20）;
//为每个随机点绘制一个标记
new google.maps.Marker（{
position：randomPoint，
map：map
}） ;
//用每个随机点扩展markerBounds。
markerBounds.extend（randomPoint）;
}
//在结尾处，markerBounds将是包含
//的最小边界框//我们的10个随机点
//最后我们可以调用Map.fitBounds（）方法将地图设置为适合
//我们的markerBounds
map.fitBounds（markerBounds）;
< / script>
< / body>
< / html>
截图：
I need to plot a set of coordinates on the map in response to a user selection, and when it happens, I'd like to pan the map to focus on that set of points. How can I find the smallest bounding box (LatLngBounds) that contains all of the coordinates?
In addition to the Stack Overflow post which @Crescent Fresh pointed to above (which is using the v2 API), the method you'd want to use is the LatLngBounds.extend().
Here's a complete example, using the v3 API:
<!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 America
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>
Screenshot:
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