Method createRangeSource

src/openlayers/mapping/WebMap.js:3715–3727

* @private * @function WebMap.prototype.createRangeSource * @description 创建分段专题图的图层source * @param {Object} parameters- 图层信息 * @param {Array} features - 所以的feature集合 * @returns {Object} 图层source

(parameters, features)

   * @returns {Object} 图层source
   */
  async createRangeSource(parameters, features) {
    //找到合适的专题字段
    let styleGroup = await this.getRangeStyleGroup(parameters, features);
    if (styleGroup) {
      return {
        style: parameters.style,
        themeField: parameters.themeSetting.themeField,
        styleGroups: styleGroup
      };
    } else {
      return false;
    }
  }

  /**
   * @private