Google地图以最小缩放范围进行绑定 [英] Google Maps bounds on minimal zoom
问题描述
我有一个简单的Google地图填充整个页面。
以下是一个示例：
I have a simple Google Map that fill the whole page. Here is a sample:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>Google Maps JavaScript API v3 Example: Marker Animations</title>
<link href="http://code.google.com/apis/maps/documentation/javascript/examples/default.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
var stockholm = new google.maps.LatLng(59.32522, 18.07002);
var map;
function initialize() {
var mapOptions = {
zoom: 0,
mapTypeId: google.maps.MapTypeId.ROADMAP,
center: stockholm
};
map = new google.maps.Map(document.getElementById("map_canvas"),
mapOptions);
google.maps.event.addListener(map, 'idle', function() {
var b = map.getBounds();
document.getElementById("bounds").innerText = b.getSouthWest().lng() + ", " + b.getNorthEast().lng();
});
}
</script>
</head>
<body onload="initialize()">
<div id="map_canvas" style="width: 100%; height: 100%;">map div</div>
<div id="bounds" style="left: 100px; top: 0px; width: 300px; height: 30px; position: absolute; background-color: #a0a0a0;"></div>
</body>
</html>
在MINIMUM缩放级别，当您可以看到多个世界地图时，我预计经度界限为-180 - 180，但实际上我不明白。我的期望错了，为什么？
At MINIMUM zoom level, when you can see several world maps, I expect longitude bounds to be -180 - 180, but in real I don't get it. Is my expectation wrong and why?
在实际应用程序中，我有一个服务器端代码，根据当前地图边界从数据库中提取标记。 b
In real application I have a server-side code that fetches markers from database depending on current map bounds.
推荐答案
边界将在窗口边界报告lat和lng - 即使地图已经包装了几次。所以，窗口右下角的lat，lng会是一个点，左上角是另一个点。
The bounds will report the lat and lng at the bounds of the window - even if the map has wrapped a few times. So what ever the lat,lng of the bottom right of your window will be one point, and the upper left will be the other.
我有同样的问题，我最终做的是创建一个90,180到-90，-180的世界范围，然后看看它是否适合
I had this same issue and what I ended up doing was creating a World bounds that was 90, 180 to -90, -180 and then seeing if that fit in the window.
var ne = new google.maps.LatLng(90, 180);
var sw = new google.maps.LatLng(-90, -180)
var world = new google.maps.LatLngBounds(ne, sw);
var fetchbounds;
if(map.getBounds().contains(ne) && map.getBounds().contains(sw)){
fetchBounds = world;
}else{
fetchBounds = map.getBounds();
}
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