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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
我有一個由geojson點列表組成的mapbox源,此源的每個元素都有一個指向圖標URL的鍵圖標 :
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
});
我想通過他們的圖標變量來表示我的功能,一種方法是添加盡可能多的圖層,因為我有不同的圖標:
map.addLayer({
id: currentLayer,
type: "symbol",
source: "featureCollection",
filter: ["!has", "point_count"],
"layout": {
"icon-image": currentIcon,
"icon-size":1.5
}
});
問題是我有超過200個不同的圖標(在800個觀察中),我真的懷疑創建200個不同的圖層是繪制我的觀察的最有效方式。 特別是當我在用戶點擊某個圖層時觸發某個功能時,我也必須多次定義這樣的功能,因為我有不同的圖標。
您可以而且應該只創建一個圖層。 icon-image
支持數據驅動的樣式,因此您可以使用"icon-image": "{icon}"
。
http://jsbin.com/yofiwizuca/1/edit?html,output
當然,這假設您的樣式中的圖標名為icon1
, icon2',
icon3, based on the values of the
GeoJSON中圖標屬性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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