Mapbox 为 featureLayer 设置图标

Question

我在为要素图层设置图标时遇到了一些问题。我不断收到 layer.setIcon is not a function 和类似的错误。如何更改该图层的图标样式？

 var layer = L.mapbox.featureLayer()
            .loadURL(attrs.geoJsonSource)
            .addTo(map);

        layer.on('ready', function() {
            this.eachLayer(function(layer){
                layer.setIcon(L.mapbox.marker.icon({
                    'marker-color': '#8834bb',
                    'marker-size': 'large',
                    'marker-symbol': 'restaurant'
                }))
            });
            map.fitBounds(featureLayer.getBounds());
        });

Answer 1

您可以使用简单样式规范来设置 geojson 的样式。看起来这需要在将其添加到要素层之前发生。您可以尝试运行 eachLayer 而不是 for 循环，然后将该层添加到另一个要素层，一旦 geojson 具有您想要的 style/icons 。这是从原来的example修改而来的。或者您可以使用 Leaflet pointToLayer 函数，如下所示。

var key = 'your key here'
L.mapbox.accessToken = key;
var map = L.mapbox.map('map')
  .setView([37.8, -96], 3);

var geojson = [
  {
    type: 'Feature',
    geometry: {
      type: 'Point',
      coordinates: [-77.031952, 38.913184]
    },
    properties: {
      title: 'Title'
    }
  }
 ];
//Option A - set the properties of the geojson using the simple style spec supported in mapbox.js for mapbox feature layers

/*for(i = 0; i < geojson.length; i++) {
  geojson[i].properties['marker-color'] = '#63b6e5';
  geojson[i].properties['marker-size'] = 'large';
  geojson[i].properties['marker-symbol'] = 'rocket';
}*/

//Option B - use the native leaflet function for points - very simple and extendable to other icon plugins
var features = L.geoJson(geojson, { 
  pointToLayer: function(feature, latlng){
    return new L.marker(latlng, {
      icon: L.mapbox.marker.icon({
        'marker-color': '#00f',
        'marker-symbol': 'star'
        })
    })
  }
 }).addTo(map);

body { margin:0; padding:0; }
    .map { position:absolute; top:0; bottom:0; width:100%; }

<script src="https://api.mapbox.com/mapbox.js/v2.4.0/mapbox.js"></script>
<link href='https://api.mapbox.com/mapbox.js/v2.4.0/mapbox.css' rel='stylesheet' />
<div id='map' class='map'></div>

Answer 2

您可以查看 https://www.mapbox.com/mapbox.js/example/v1.0.0/custom-marker/ and http://leafletjs.com/examples/custom-icons/ 以获取更多信息，但显然您可能满足您的需要：

使用您自己的图标样式。（第一）

and/or

使用 geoJSON 文件图标样式。（第二）

代码：

var map = L.mapbox.map('map', 'mapbox.streets').setView([40, -74.50], 9);
var layer = L.mapbox.featureLayer().addTo(map);

layer.on('layeradd', function(e) {
    var marker = e.layer,feature = marker.feature;

    // TWO POSSIBILITIES

    // FIRST // your own method to define how icon will be rendered   
    marker.setIcon(L.mapbox.marker.icon({
        'marker-color': '#8834bb',
        'marker-size': 'large',
        'marker-symbol': 'restaurant' 
    }));

    // SECOND // use json directly to define how icon will be rendered   
    //marker.setIcon(L.mapbox.marker.icon(feature.properties.icon));
});

layer.setGeoJSON(geoJson);

假设 geoJSON 文件如下所示：

var geoJson = [{
    "type": "Feature",
    "geometry": {
        "type": "Point",
        "coordinates": [-75.00, 40]
    },
    "properties": {
        "title": "Small astronaut",
        "icon": {
            'marker-color': '#0034bb',
            'marker-size': 'large',
            'marker-symbol': 'restaurant' 
        }
    }
}, {
    "type": "Feature",
    "geometry": {
        "type": "Point",
        "coordinates": [-74.00, 40]
    },
    "properties": {
        "title": "Big astronaut",
        "icon": {
            'marker-color': '#8834bb',
            'marker-size': 'large',
            'marker-symbol': 'restaurant' 
        }
    }
}];

Answer 3

我不确定为什么，但是 none 提议的解决方案对我有用。相反，我必须遍历图层的各个层。

        layer.on('layeradd', function(e) {
            var marker = e.layer, feature = marker.feature;
            e.layer.getLayers().forEach(function(marker) {
                marker.setIcon(L.mapbox.marker.icon({
                    'marker-color': '#8834bb',
                    'marker-size': 'large',
                    'marker-symbol': 'restaurant'
                }));
            })
        });

Mapbox 为 featureLayer 设置图标

Mapbox set icon for featureLayer

leaflet

mapbox