如何以米为单位创建LatLng点周围的LatLngBounds？

Question

我想在X米的中心点（LatLng）周围创建一个正方形（LatLngBounds）。

Answer 1

使用L.LatLng.toBounds() method，例如，

var center = L.latLng(40,-3); 
var bounds = center.toBounds(500); 

或

var bounds = L.latLng(40,-3).toBounds(500) 

Answer 2

下列溶液演示如何得出这样一个正方形：通过在具有半径点画圆

• 计算边界以米
• 平局指定 正方形使用圆圈边界

例

function drawSquare(map, center, properties, sideLengthInMeters){ 
    var circle = L.circle(center, sideLengthInMeters/2).addTo(map); 
    var bounds = circle.getBounds(); 
    map.removeLayer(circle); //hide circle 
    var rect = L.rectangle(bounds, properties).addTo(map); 
    return rect; 
} 

演示

var center = [59.33,18.02]; 
 

 
// Create the map 
 
var map = L.map('map').setView(center, 10); 
 

 
// Set up the OSM layer 
 
L.tileLayer(
 
     'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', 
 
     { maxZoom: 18 }).addTo(map); 
 

 
    
 
L.marker(center).addTo(map); 
 

 
var sideInMeters = 10000; 
 
drawSquare(map,center,{ color: 'blue', weight: 1 }, sideInMeters); 
 

 

 
function drawSquare(map, center, properties, sideLengthInMeters){ 
 
    var circle = L.circle(center, sideLengthInMeters/2).addTo(map); 
 
    var bounds = circle.getBounds(); 
 
    map.removeLayer(circle); //hide circle 
 
    var rect = L.rectangle(bounds, properties).addTo(map); 
 
    return rect; 
 
}

#map { 
 
    height: 400px; 
 
}

<script type="text/javascript" src="//code.jquery.com/jquery-1.9.1.js"></script> 
 
<link rel="stylesheet" href="https://unpkg.com/leaflet@1.0.1/dist/leaflet.css" /> 
 
<script src="https://unpkg.com/leaflet@1.0.1/dist/leaflet.js"></script> 
 
<link rel="stylesheet" type="text/css" href="style.css"> 
 
<script type="text/javascript" src="app.js"></script> 
 
<div id="map"></div>