大部分你想做的事情都可以通过使用Leaflet的实用方法轻松完成。如果您要在像L.Polygon
这样的复杂形状上执行此操作,则需要使用TurfJS之类的东西。
对于L.Circle
,您需要计算圆心与半径之间的距离并进行比较:
var marker = new L.Marker(...),
circle = new L.Circle(...);
var contains = circle.getLatLng().distanceTo(marker.getLatLng()) < circle.getRadius();
< p > 对于 < code > L.Rectangle ,您需要获取其边界对象并使用contains方法:
var marker = new L.Marker(...),
rectangle = new L.Rectangle(...);
var contains = rectangle.getBounds().contains(marker.getLatLng());
对于复杂的多边形,我会使用Turf,但还有其他的库和插件可用。这里是一个使用Turf的inside
方法的示例。它需要一个GeoJSON点和多边形要素作为参数,因此要注意转换:
var marker = new L.Marker(...),
polygon = new L.Polygon(...);
var contains = turf.inside(marker.toGeoJSON(), polygon.toGeoJSON());
您可以将它们包装成每个相应类的便捷方法:
L.Polygon.include({
contains: function (latLng) {
return turf.inside(new L.Marker(latLng).toGeoJSON(), this.toGeoJSON());
}
});
L.Rectangle.include({
contains: function (latLng) {
return this.getBounds().contains(latLng);
}
});
L.Circle.include({
contains: function (latLng) {
return this.getLatLng().distanceTo(latLng) < this.getRadius();
}
});
var marker = new L.Marker(...),
polygon = new L.Polygon(...),
rectangle = new L.Rectangle(...),
circle = new L.Circle(...);
polygon.contains(marker.getLatLng());
rectangle.contains(marker.getLatLng());
circle.contains(marker.getLatLng());
请确认以下翻译是否符合要求:
请注意,如果您实现了多边形方法,则无需使用矩形方法。由于矩形是从多边形扩展的,它将继承该方法。我留下它是为了完整性。
现在迭代标记并进行比较很容易:
map.on(L.Draw.Event.CREATED, function (e) {
markers.eachLayer(function (marker) {
if (!e.layer.contains(marker.getLatLng())) {
marker.remove();
}
});
});
Hope that helps, here's a working snippet:
var map = new L.Map('leaflet', {
'center': [0, 0],
'zoom': 0
});
var markers = new L.LayerGroup().addTo(map);
for (var i = 0; i < 300; i++) {
var marker = new L.Marker([
(Math.random() * (90 - -90) + -90).toFixed(5) * 1,
(Math.random() * (180 - -180) + -180).toFixed(5) * 1
]).addTo(markers);
}
new L.Control.Draw({
draw: {
marker : false,
polygon : true,
polyline : false,
rectangle: true,
circle : {
metric: 'metric'
}
},
edit: false
}).addTo(map);
L.Polygon.include({
contains: function (latLng) {
return turf.inside(new L.Marker(latLng).toGeoJSON(), this.toGeoJSON());
}
});
L.Rectangle.include({
contains: function (latLng) {
return this.getBounds().contains(latLng);
}
});
L.Circle.include({
contains: function (latLng) {
return this.getLatLng().distanceTo(latLng) < this.getRadius();
}
});
map.on(L.Draw.Event.CREATED, function (e) {
markers.eachLayer(function (marker) {
if (!e.layer.contains(marker.getLatLng())) {
marker.remove();
}
});
});
body {
margin: 0;
}
html, body, #leaflet {
height: 100%;
}
<!DOCTYPE html>
<html>
<head>
<title>Leaflet 1.0.3</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link type="text/css" rel="stylesheet" href="//unpkg.com/leaflet@1.0.3/dist/leaflet.css" />
<link type="text/css" rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/leaflet.draw/0.4.9/leaflet.draw.css" />
</head>
<body>
<div id="leaflet"></div>
<script type="application/javascript" src="//unpkg.com/leaflet@1.0.3/dist/leaflet.js"></script>
<script type="application/javascript" src="//cdnjs.cloudflare.com/ajax/libs/leaflet.draw/0.4.9/leaflet.draw.js"></script>
<script type="application/javascript" src="//unpkg.com/@turf/turf@latest/turf.min.js"></script>
</body>
</html>