Method createRangeLayer

src/openlayers/mapping/WebMap.js:3673–3705

* @private * @function WebMap.prototype.createRangeLayer * @description 创建分段图层 * @param {Object} layerInfo- 图层信息 * @param {Array} features - 所有feature结合 * @returns {ol.layer.Vector} 单值图层

(layerInfo, features)

   * @returns {ol.layer.Vector} 单值图层
   */
  async createRangeLayer(layerInfo, features) {
    //这里获取styleGroup要用所以的feature
    let styleSource = await this.createRangeSource(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');
      if (styleSource) {
        let labelField = styleSource.themeField;
        let value = Number(feature.get('attributes')[labelField.trim()]);
        let styleGroups = styleSource.styleGroups;
        for (let i = 0; i < styleGroups.length; i++) {
          if (i === 0) {
            if (value >= styleGroups[i].start && value <= styleGroups[i].end) {
              return styleGroups[i].olStyle;
            }
          } else {
            if (value > styleGroups[i].start && value <= styleGroups[i].end) {
              return styleGroups[i].olStyle;
            }
          }
        }
      }
    });

    return layer;
  }

  /**
   * @private