[英]Converting OpenLayers Polygon to GeoJSON with different projection
[英]Openlayers 6 - Show Geojson Label on polygon
請我在 openlayers 上工作,我不能將屬性值用作我的 GeoJSON 矢量文件的 label。
我想在我的 GeoJSON 文件中將屬性“osmid”中的文本顯示為 label。
這是我的代碼
var map = new ol.Map ({//carte
target: 'map',
layers: [mapquest, bingmaps, stamen],
controls: ol.control.defaults().extend([
new ol.control.ScaleLine(),//affichage de l'échelle
new ol.control.ZoomSlider(),//affichage de la barre de zoom
new ol.control.FullScreen() //affichage en plein écran
]),
renderer: 'canvas',
view: view
});
// ajouter un stle pour la couche batiment
var styleBatiment = new ol.style.Fill({
color : [187, 165, 41, 0.52] // couleur en rgba
});
var strokeBatiment = new ol.style.Stroke({
color : [121, 38, 255, 0.97], // couleur en rgba
width : 1,
});
var textBatiment = new ol.style.Text({
font: '12px Calibri,sans-serif',
fill: new ol.style.Fill({
color: '#000'
}),
stroke: new ol.style.Stroke({
color: '#fff',
width: 3
}),
text: '1'
});
var batimentstyle = new ol.style.Style({
fill : styleBatiment,
stroke : strokeBatiment,
text : textBatiment
});
// ajouter une couche vecteur : batiments
const building = new ol.layer.VectorImage({
source : new ol.source.Vector({
url:'./data/building.geojson',
format: new ol.format.GeoJSON()
}),
visible : true,
title : 'Batiments',
style : batimentstyle
});
map.addLayer(building);`
我的 Geojson 文件如下所示:
{
"type": "FeatureCollection",
"name": "building",
"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },
"features": [
{ "type": "Feature", "properties": { "osm_id": 86944868, "name": null, "type": "semidetached_hou" }, "geometry": { "type": "MultiPolygon", "coordinates": [ [ [ [ 2.0568994, 48.93285799998651 ], [ 2.0569538, 48.932929999986484 ], [ 2.0569832, 48.932920099986482 ], [ 2.0569749, 48.932909099986489 ], [ 2.0570069, 48.932898299986483 ], [ 2.0569589, 48.932837599986492 ], [ 2.0568994, 48.93285799998651 ] ] ] ] } },
{ "type": "Feature", "properties": { "osm_id": 86944890, "name": null, "type": "detached" }, "geometry": { "type": "MultiPolygon", "coordinates": [ [ [ [ 2.0577999, 48.933744699986484 ], [ 2.0578716, 48.933812699986483 ], [ 2.0579672, 48.933769099986492 ], [ 2.0578954, 48.933701199986487 ], [ 2.0577999, 48.933744699986484 ] ] ] ] } },
您需要使用樣式 function 將樣式中的文本設置為功能屬性的值
style : function(feature) {
batimentstyle.getText().setText(feature.get('osm_id'));
return batimentstyle;
}
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