Method createUniqueLayer

src/openlayers/mapping/WebMap.js:3508–3528

* @private * @function WebMap.prototype.createUniqueLayer * @description 获取当前字段对应的最大值，用于计算权重 * @param {Object} layerInfo - 图层信息 * @param {Array} features - 所有feature结合

(layerInfo, features)

   * @param {Array} features - 所有feature结合
   */
  async createUniqueLayer(layerInfo, features) {
    let styleSource = await this.createUniqueSource(layerInfo, features);
    let layer = new olLayer.Vector({
      styleSource: styleSource,
      source: new Vector({
        features: layerInfo.filterCondition ? this.getFiterFeatures(layerInfo.filterCondition, features) : features,
        wrapX: false
      })
    });
    layer.setStyle((feature) => {
      let styleSource = layer.get('styleSource');
      let labelField = styleSource.themeField;
      let label = feature.get('attributes')[labelField];
      let styleGroup = styleSource.styleGroups.find((item) => {
        return item.value === label;
      });
      return styleGroup.olStyle;
    });

    return layer;
  }

  /**
   * @private