我不熟悉传单,正在尝试在点击地图时圈出地图。我需要如下条件:
- 圆圈在地图上点击时从一个点移动到另一个点(如果圆圈已经存在并且只有一个圆圈)
- 直接放大圆圈的位置
然而,我有以下问题:
- 圆增加
- 当按下另一个点时,圆圈先消失,然后出现在前一个点和最近一个点
- 不要放大圆圈的位置
这个问题有解决办法吗?
<!DOCTYPE html>
<html>
<head>
<title>Leaflet Polygons</title>
<link rel = "stylesheet" href = "http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css"/>
<script src = "http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js"></script>
</head>
<body>
<div id = "map" style = "width: 900px; height: 580px"></div>
<script>
// Creating map options
var mapOptions = {
center: [16.506174, 80.648015],
zoom: 11
}
var groupCircle = L.featureGroup();
var map = new L.map('map', mapOptions); // Creating a map object
// Creating a Layer object
var layer = new L.TileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png');
map.addLayer(layer); // Adding layer to the map
map.on("click", function(e){
if(map.hasLayer(groupCircle)){
map.removeLayer(groupCircle)
}else{
new L.Circle([e.latlng.lat, e.latlng.lng], 5000).addTo(groupCircle);
map.addLayer(groupCircle)
}
})
</script>
</body>
</html>
- 圆圈会增加,因为你只删除了featureGroup层,而没有删除featureGroup的内容。可按以下步骤重新启动:
map.removeLayer(groupCircle)
groupCircle = L.featureGroup();
- 可在重新启动后直接添加
if(map.hasLayer(groupCircle)){
//Start
map.removeLayer(groupCircle)
groupCircle = L.featureGroup();
new L.Circle([e.latlng.lat, e.latlng.lng], 5000).addTo(groupCircle);
map.addLayer(groupCircle)
//End
}else{
new L.Circle([e.latlng.lat, e.latlng.lng], 5000).addTo(groupCircle);
map.addLayer(groupCircle)
}
- 可以添加setView"命令:
map.setView([e.latlng.lat, e.latlng.lng], 11); //11 = zoom level
完整代码:
<!DOCTYPE html>
<html>
<head>
<title>Leaflet Polygons</title>
<link rel = "stylesheet" href = "http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css"/>
<script src = "http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js"></script>
</head>
<body>
<div id = "map" style = "width: 900px; height: 580px"></div>
<script>
// Creating map options
var mapOptions = {
center: [16.506174, 80.648015],
zoom: 11
}
var groupCircle = L.featureGroup();
var map = new L.map('map', mapOptions); // Creating a map object
// Creating a Layer object
var layer = new L.TileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png');
map.addLayer(layer); // Adding layer to the map
map.on("click", function(e){
map.setView([e.latlng.lat, e.latlng.lng], 11); //11 = zoom level
if(map.hasLayer(groupCircle)){
//Start
map.removeLayer(groupCircle)
groupCircle = L.featureGroup();
new L.Circle([e.latlng.lat, e.latlng.lng], 5000).addTo(groupCircle);
map.addLayer(groupCircle)
//End
}else{
new L.Circle([e.latlng.lat, e.latlng.lng], 5000).addTo(groupCircle);
map.addLayer(groupCircle)
}
})
</script>
</body>
</html>