Method createRankStyleSource

src/openlayers/mapping/WebMap.js:4262–4267

* @private * @function WebMap.prototype.createRankSymbolLayer * @description 创建等级符号图层的source * @param {Object} parameters - 图层信息 * @param {Array} features - 添加到图层上的features * @param {string} featureType - feature的类型 * @returns {Object} styleGroups

(parameters, features, featureType)

   * @returns {Object} styleGroups
   */
  async createRankStyleSource(parameters, features, featureType) {
    let themeSetting = parameters.themeSetting,
      themeField = themeSetting.themeField;
    let styleGroups = await this.getRankStyleGroup(themeField, features, parameters, featureType);
    return styleGroups ? { parameters, styleGroups } : false;
  }
  /**
   * @private
   * @function WebMap.prototype.getRankStyleGroup