使用 Leaflet.js 和 OSM 时仅显示美国

问题描述

我正在使用 Leaflet.js 和 OSM 图块来创建地图，但我只希望看到美国大陆，而不是整个世界.这可能吗?

I'm using leaflet.js and OSM tiles to create a map, but I'd only like the continental United States to be viewable, not the entire world. Is that possible?

我正在像这样加载地图:

I'm loading the map like this:

var map = L.map('map').setView([39.82, -98.58], 5);

L.tileLayer('http://{s}.basemaps.cartocdn.com/dark_all/{z}/{x}/{y}.png', {
    attribution: '...',
    maxZoom: 18
}).addTo(map);

推荐答案

这是可能的，而且很容易做到.首先，您需要美国大陆边界框(最外边缘)的坐标.你可以用谷歌搜索它们，我在这里找到它们:http://isithackday.com/geoplanet-explorer/index.php?woeid=24865672 您需要西南和东北坐标来创建边界对象:

That's possible and easy to do. First of you'll need the coordinates for the bounding box (the outermost edges) of the continental united states. You can just google them, i found them here: http://isithackday.com/geoplanet-explorer/index.php?woeid=24865672 You need the southwest and northeast coordinates to create a bounds object:

var maxBounds = L.latLngBounds(
    L.latLng(5.499550, -167.276413), //Southwest
    L.latLng(83.162102, -52.233040)  //Northeast
);

或者您可以使用简写版本，即嵌套数组:

Or you can go for the shorthand version, a nested array:

var maxBounds = [
    [5.499550, -167.276413], //Southwest
    [83.162102, -52.233040]  //Northeast
];

现在您可以通过两种方式在地图上设置它们，初始化时，使用 maxBounds 选项和 L.MapfitBounds 方法>

Now you can set those on your map in two ways, upon initialization, using the maxBounds option and the fitBounds method of L.Map

L.map('map', {
    'center': [0, 0],
    'zoom': 0
    'maxBounds': maxBounds
}).fitBounds(maxBounds);

这是一个关于 Plunker 的工作示例:http://plnkr.co/edit/eEsxeh?p=预览

Here's a working example on Plunker: http://plnkr.co/edit/eEsxeh?p=preview

或者当您的地图已经初始化时，您可以使用 L.Map 的 setMaxBounds 方法和 fitBounds 方法.(假设您的地图已分配给变量 map):

Or when your map is already initialized you can use the setMaxBounds method and the fitBounds method of L.Map. (assuming your map is assigned to variable map):

map.setMaxBounds(maxBounds);
map.fitBounds(maxBounds);

这是一个关于 Plunker 的工作示例:http://plnkr.co/edit/HJKk0O?p=预览

Here's a working example on Plunker: http://plnkr.co/edit/HJKk0O?p=preview

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