Method getWmsInfo

src/openlayers/mapping/WebMap.js:1780–1833

* @private * @function WebMap.prototype.getWmsInfo * @description 获取wms的图层参数。 * @param {Object} layerInfo - 图层信息。

(layerInfo)

   * @param {Object} layerInfo - 图层信息。
   */
  getWmsInfo(layerInfo) {
    let that = this;
    let url = layerInfo.url.trim();
    url += url.indexOf('?') > -1 ? '&SERVICE=WMS&REQUEST=GetCapabilities' : '?SERVICE=WMS&REQUEST=GetCapabilities';
    let options = {
      withCredentials: that.isCredentail(url, layerInfo.proxy),
      withoutFormatSuffix: true
    };

    let promise = new Promise(function (resolve) {
      return FetchRequest.get(that.getRequestUrl(url, layerInfo.proxy), null, options)
        .then(function (response) {
          return response.text();
        })
        .then(async function (capabilitiesText) {
          const format = new WMSCapabilities();
          let capabilities = format.read(capabilitiesText);
          if (capabilities) {
            let layers = capabilities.Capability.Layer.Layer,
              proj = layerInfo.projection;
            layerInfo.subLayers = layerInfo.layers[0];
            layerInfo.version = capabilities.version;
            for (let i = 0; i < layers.length; i++) {
              // 图层名比对
              if (layerInfo.layers[0] === layers[i].name) {
                let layer = layers[i];
                if (layer.bbox[proj]) {
                  let bbox = layer.bbox[proj].bbox;
                  // wmts 130 坐标轴是否反向，目前还无法判断
                  // 后续还需继续完善WKT 增加坐标轴方向值
                  // 目前wkt信息 来自https://epsg.io/
                  // 提供坐标方向值的网站  如：https://www.epsg-registry.org/export.htm?wkt=urn:ogc:def:crs:EPSG::4490
                  if (
                    (layerInfo.version === '1.3.0' && layerInfo.projection === 'EPSG:4326') ||
                    (layerInfo.version === '1.3.0' && layerInfo.projection === 'EPSG:4490')
                  ) {
                    layerInfo.extent = [bbox[1], bbox[0], bbox[3], bbox[2]];
                  } else {
                    layerInfo.extent = bbox;
                  }
                  break;
                }
              }
            }
          }
          resolve();
        })
        .catch(function (error) {
          that.errorCallback && that.errorCallback(error, 'getWMSFaild', that.map);
          resolve();
        });
    });
    return promise;
  }
  /**
   * @private
   * @function WebMap.prototype.getTileUrl