Function getVectorTileCRSExtent

src/mapboxgl/mapping/InitMap.js:135–148

* @private * @function getVectorTileCRSExtent * @description 获取矢量瓦片坐标系范围。 * @param {string} vectorStyleUrl - 矢量瓦片 style json 服务地址。 * @param {string} restMapUrl - 矢量瓦片 rest 地图服务地址。 * @returns {Object}

(vectorStyleUrl, restMapUrl)

 * @returns {Object}
 */
async function getVectorTileCRSExtent(vectorStyleUrl, restMapUrl) {
  try {
    const vectorStyleDataRes = await FetchRequest.get(vectorStyleUrl);
    const vectorStyleData = await vectorStyleDataRes.json();
    if (vectorStyleData.metadata && vectorStyleData.metadata.indexbounds) {
      return { extent: vectorStyleData.metadata.indexbounds };
    }
    const vectorExtentDataRes = await FetchRequest.get(Util.urlPathAppend(restMapUrl, 'prjCoordSys/projection/extent.json'));
    const vectorExtentData = await vectorExtentDataRes.json();
    return { extent: vectorExtentData, center: vectorStyleData.center };
  } catch (error) {
    return { extent: [] };
  }
}

/**
 * @private