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[英]How to get unique feature properties from geojson source in Mapbox GL JS?
[英]Mapbox GL js, effectively represent a geojson source by a variable icon
我有一个由geojson点列表组成的mapbox源,此源的每个元素都有一个指向图标URL的键图标 :
var featureCollection = {
"type": "FeatureCollection",
"features": [
{
"geometry":{
"type": "Point",
"coordinates": [1,1]
},
"properties": {
"id": 1,
"name": "name1",
"address": "address1",
"icon": "icon1"
}
},
{
"geometry":{
"type": "Point",
"coordinates": [2,2]
},
"properties": {
"id": 2,
"name": "name2",
"address": "address2",
"icon": "icon2"
}
},
{
"geometry":{
"type": "Point",
"coordinates": [3,3]
},
"properties": {
"id": 3,
"name": "name3",
"address": "address3",
"icon": "icon3"
}
},
{
"geometry":{
"type": "Point",
"coordinates": [4,4]
},
"properties": {
"id": 4,
"name": "name4",
"address": "address4",
"icon": "icon1"
}
}
]
}
map.addSource("shops", {
type: "geojson",
data: featureCollection,
cluster: true,
clusterMaxZoom: 14,
clusterRadius: 50
});
我想通过他们的图标变量来表示我的功能,一种方法是添加尽可能多的图层,因为我有不同的图标:
map.addLayer({
id: currentLayer,
type: "symbol",
source: "featureCollection",
filter: ["!has", "point_count"],
"layout": {
"icon-image": currentIcon,
"icon-size":1.5
}
});
问题是我有超过200个不同的图标(在800个观察中),我真的怀疑创建200个不同的图层是绘制我的观察的最有效方式。 特别是当我在用户点击某个图层时触发某个功能时,我也必须多次定义这样的功能,因为我有不同的图标。
您可以而且应该只创建一个图层。 icon-image
支持数据驱动的样式,因此您可以使用"icon-image": "{icon}"
。
http://jsbin.com/yofiwizuca/1/edit?html,output
当然,这假设您的样式中的图标名为icon1
, icon2',
icon3, based on the values of the
GeoJSON中图标属性based on the values of the
。
如果需要操作值,也可以使用https://www.mapbox.com/mapbox-gl-js/style-spec#expressions 。
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