real3d-portalsite/src/utils/MapHelper/MapHelper.js

import proj4 from "proj4";
import { Notification, MessageBox, Message, Loading } from "element-ui";

const CTservice = axios.create({
  // 超时
  timeout: 60000,
});
// 响应拦截器
CTservice.interceptors.response.use(
  (res) => {
    // 未设置状态码则默认成功状态
    const code = res.data.code || 200;
    // 二进制数据则直接返回
    if (
      res.request.responseType === "blob" ||
      res.request.responseType === "arraybuffer"
    ) {
      return res.data;
    }
    if (code !== 200) {
      Message({
        message: "模型服务获取失败，请检查服务",
        type: "warning",
      });
      return null;
    } else {
      return res;
    }
  },
  (error) => {
    console.log("err" + error);
    Message({
      message: "模型服务获取失败，请检查服务",
      type: "warning",
    });
    return null;
  }
);
export const mapQuery = async (url, queryObj) => {
  let response = await CTservice.post(url, queryObj);
  if (response && response.data.featureCount > 0) {
    return response.data;
  } else {
    return null;
  }
};

/**
 * 墨卡托转经纬度
 * @author
 * @param {*} x
 * @param {*} y
 * @returns [x,y]
 */
export const mercator2lonLat = (x, y) => {
  var obj = proj4(proj4("EPSG:3857"), proj4("EPSG:4326"), [x, y]);
  return obj;
};

/**
 * 经纬度转墨卡托
 * @author
 * @param {*} x
 * @param {*} y
 * @returns [x,y]
 */
export const lonLat2Mercator = (x, y) => {
  var obj = proj4(proj4("EPSG:4326"), proj4("EPSG:3857"), [x, y]);
  return obj;
};

/**
 * 笛卡尔坐标系转WGS84坐标系(经纬度)
 * @author
 * @param {object} point 点,笛卡尔坐标{x:x,y:y,z:z}
 * @returns {object} -lat: lat, lng: lng, alt: alt
 */
export const cartesian3ToWGS84 = (point) => {
  var cartesian3 = new Cesium.Cartesian3(point.x, point.y, point.z);
  var cartographic = Cesium.Cartographic.fromCartesian(cartesian3);
  var lat = Cesium.Math.toDegrees(cartographic.latitude);
  var lng = Cesium.Math.toDegrees(cartographic.longitude);
  var alt = cartographic.height;
  return {
    lat: lat,
    lng: lng,
    alt: alt,
  };
};

/**
 * 对象数组扁平化
 * @param {array} arr 数组
 * @param {string} children
 * @returns
 */
export const flatten = (arr, children = "children") => {
  return arr.reduce((result, item) => {
    return result.concat(
      item,
      Array.isArray(item[children]) ? flatten(item[children], children) : []
    );
  }, []);
};

/**
 * @author
 * @description 设置地下模式状态
 * @param {*} state
 */
export const undergroundMode = (state) => {
  if (state) {
    viewer.scene.globe.globeAlpha = 0;
  } else {
    viewer.scene.globe.globeAlpha = 1;
  }
  // this.scene.undergroundMode = state; //设置开启地下场景
};
/**
 * @namespace   名称：getGroundPoint
 * @description 作用：根据经纬度（或者墨卡托）获取地面三维坐标
 * @param {*} lng 经度，
 * @param {*} lat 纬度，
 * @returns {Cartesian3} 返回笛卡尔坐标
 */
export const getGroundPoint = async (lng, lat, completed) => {
  if (!lng || !lat) return null;
  try {
    debugger;
    let positions = [Cesium.Cartographic.fromDegrees(lng, lat)];
    //如果有dem高程，则取dem高程，如果没有，则地图面高度为0
    if (viewer.terrainProvider) {
      var promise = Cesium.sampleTerrainMostDetailed(
        viewer.terrainProvider,
        positions
      );
      const resultP = await Promise.resolve(promise);
      if (resultP && resultP.length > 0) {
        let myP = new Cesium.Cartesian3.fromDegrees(
          lng,
          lat,
          resultP[0].height
        );
        return myP;
      }
    }
  } catch (error) {
    return null;
  }

  let myP = Cesium.Cartesian3.fromDegrees(lng, lat, 0);
  return myP;
};