如何在Openlayers 3中创建KML时保留Polygon的样式？

Question

当我将功能写入KML。它不包括功能的样式。一个similiar question被问的OpenLayers 2.我想要的OpenLayers 3.下面的代码是用于编写功能KML文件

var drfeatures = drawLayerSource.getFeatures(); 
var format = new ol.format.KML(); 
var kml = format.writeFeatures(drfeatures, {featureProjection:'EPSG:3857'}); 

Answer 1

你可以只添加样式对象到ol.format.KML代码（） ;

var source = new ol.source.Vector({ 
    url: 'city.kml', 
    format: new ol.format.KML({ 
     projection: 'EPSG:3857', 
     extractStyles: false 
    }) 
}); 

function styleFunction(feature) { 
    var style = new ol.style.Style({ 
     stroke: new ol.style.Stroke({ 
     color: 'red', 
     width: 4 
     }) 
    }) 
    return [style]; 
} 

var layer = new ol.layer.Vector({ 
    source: source, 
    style: styleFunction 
}); 
map.addLayer(layer);