Method createRankSymbolLayer

src/openlayers/mapping/WebMap.js:4230–4252

* @private * @function WebMap.prototype.createRankSymbolLayer * @description 创建等级符号图层 * @param {Object} layerInfo - 图层信息 * @param {Array} features - 添加到图层上的features * @returns {ol.layer.Vector} 矢量图层

(layerInfo, features)

   * @returns {ol.layer.Vector} 矢量图层
   */
  async createRankSymbolLayer(layerInfo, features) {
    let styleSource = await this.createRankStyleSource(layerInfo, features, layerInfo.featureType);
    let layer = new olLayer.Vector({
      styleSource,
      source: new Vector({
        features: layerInfo.filterCondition ? this.getFiterFeatures(layerInfo.filterCondition, features) : features,
        wrapX: false
      }),
      renderMode: 'image'
    });
    layer.setStyle((feature) => {
      let styleSource = layer.get('styleSource');
      let themeField = styleSource.parameters.themeSetting.themeField;
      let value = Number(feature.get('attributes')[themeField]);
      let styleGroups = styleSource.styleGroups;
      for (let i = 0, len = styleGroups.length; i < len; i++) {
        if (value >= styleGroups[i].start && value < styleGroups[i].end) {
          return styleSource.styleGroups[i].olStyle;
        }
      }
    });
    return layer;
  }
  /**
   * @private
   * @function WebMap.prototype.createRankSymbolLayer