我使用Leaflet绘制OpenStreetMap并使用自定义图标标记
附加它var mymap = L.map('mapid').setView([x, y], 13);
L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token={accessToken}', {
attribution: 'Map data © <a href="http://openstreetmap.org">OpenStreetMap</a> contributors, <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, Imagery © <a href="http://mapbox.com">Mapbox</a>',
maxZoom: 18,
id: ID,
accessToken: accessToken
}).addTo(mymap);
var busIcon = new L.Icon({
iconUrl: 'images/marker/bus.png',
// shadowUrl: 'images/leaflet/marker-shadow.png',
iconSize: [12, 12],
iconAnchor: [12, 41],
popupAnchor: [1, -34],
// shadowSize: [41, 41]
});
var marker = L.marker([x, y],{icon:busIcon}).addTo(mymap);
mymap.on('zoomed', function() {
var currentZoom = mymap.getZoom();
busIcon = new L.Icon({
iconUrl: 'images/marker/bus.png',
iconSize: [mymap.getZoom*2, mymap.getZoom*2],
iconAnchor: [12, 41],
popupAnchor: [1, -34],
});
marker.setIcon(busIcon);
});
现在我想根据缩放级别调整标记图标的大小。我上面的代码有问题。我该怎么办?如果marker是CircleMaker
,那么我可以轻松处理setRadius
函数。但在这种情况下,标记是一个自定义图标,我尝试如上,但失败了。如何解决?
答案 0 :(得分:2)
正如YaFred所说,有一些拼写错误,例如mymap.getZoom
,但mymap.getZoom()
也应该是className
我对这个老问题做了一个新答案,提出了一个更有效的解决方案。您可以在图标中添加zoomend
(请参阅leaflet documentation)。
这意味着我们可以通过CSS编辑图标的高度和宽度!在var newzoom = '' + (2*(mymap.getZoom())) +'px';
$('#mapid .YourClassName').css({'width':newzoom,'height':newzoom});
函数中,只需调用此JQuery:
class test {
let myDispatchGroup = DispatchGroup()
func receive () {
myDispatchGroup.enter()
var inputBuffer = Array<UInt8>(repeating: 0, count: BUFFER_MAX);
let bytesRead = self.inputStream.read(&inputBuffer, maxLength: BUFFER_MAX);
if(bytesRead > 0){
let string = convertToString(byteArray: inputBuffer, length: bytesRead);
myDispatchGroup.leave()
}
myDispatchGroup.notify(queue: DispatchQueue.main) {
// Call if previous is finished
CommandHandler.convert(string);
}
}
对于大量标记,这将显着提高您的性能,如此stackoverflow问题中所述: Leaflet custom icon resize on zoom. Performance icon vs divicon
答案 1 :(得分:1)
你有一个错字:缩放应该是zoomend
map.on('zoomend', function() {
});
http://plnkr.co/edit/72ywrO8pgmmxLW6Y8mcL?p=preview
除此之外,我会创建并保持图标不受zoomend回调的影响。
实际上,每次缩放变化时,您的代码都会创建一个图标。