无论如何要在单层上指定特征的 z 顺序？

Question

我正在使用具有三个特征的单层并且想指定 z 顺序但无论如何都不起作用。

根据我的理解，功能是按照我添加的相同顺序绘制，所以我尝试以相反的顺序添加，但它对我不起作用。

添加功能的代码

var features=[];
jQuery.each(data.route, function (key, val) 
{
  var localfeature = new ol.Feature({ geometry: objGeoJSON.readGeometry(JSON.parse(val.simpleRoute)).transform('EPSG:4326', 'EPSG:3857') });
  localfeature.set("rtype", "R" + (key + 1));
  features.push(localfeature);
});
currentRoute.routingSource.addFeatures(features);

层的样式函数

//function to apply color based on rtype attribute.
function styleFunction(feature, resolution) {
  var level = feature.get('rtype');
  if (!level || !RouteType[level]) {
    return [defaultStyle];
  }
  if (!styleCache[level]) {
    styleCache[level] = new ol.style.Style({
      stroke: new ol.style.Stroke({
        color: RouteType[level],
        width: 4
      })
    });
  }
  // at this point, the style for the current level is in the cache
  // so return it (as an array!)
  return [styleCache[level]];
}

Answer 1

我终于找到了解决方案，这是将重新排列特征的最终样式函数 z-index。

`

    //function to apply color based on rtype attribute.
    function styleFunction(feature, resolution) {
      var level = feature.get('rtype');
      if (!level || !RouteType[level]) {
        return [defaultStyle];
      }
      if (!styleCache[level]) {
        styleCache[level] = new ol.style.Style({
          stroke: new ol.style.Stroke({
            color: RouteType[level],
            width: 4
          }),
          zIndex: zIndexValue
        });
      }
  // at this point, the style for the current level is in the cache
  // so return it (as an array!)
  return [styleCache[level]];
}`

您可以在此处查看示例 http://bl.ocks.org/wboykinm/cc509eb2763ca1ba9293

无论如何要在单层上指定特征的 z 顺序？

Is there anyway to specify z-order of feature on single layer?

javascript

openlayers-3