Method isMvt

src/openlayers/mapping/WebMap.js:4849–4870

* @private * @function WebMap.prototype.isMvt * @description 判断当前能否使用数据服务的mvt上图方式 * @param {string} serviceUrl 数据服务的地址 * @param {string} datasetName 数据服务的数据集名称 * @param {boolean | undefined} proxy 是否带上代理 * @returns {Object} 数据服务的信息

(serviceUrl, datasetName, proxy)

   * @returns {Object} 数据服务的信息
   */
  isMvt(serviceUrl, datasetName, proxy) {
    let that = this;
    return this.getDatasetsInfo(serviceUrl, datasetName).then((info) => {
      //判断是否和底图坐标系一直
      if (info.epsgCode == that.baseProjection.split('EPSG:')[1]) {
        return FetchRequest.get(that.getRequestUrl(`${info.url}/tilefeature.mvt`, proxy), null, {
          withCredentials: that.isCredentail(info.url, proxy)
        })
          .then(function (response) {
            return response.json();
          })
          .then(function (result) {
            info.isMvt = result.error && result.error.code === 400;
            return info;
          })
          .catch(() => {
            return info;
          });
      }
      return info;
    });
  }

  /**
   * @private