GCSGUI/src/utils/map/coordinate.ts

/*
 * @Author: cbwu 504-wuchengbo@htsdfp.com
 * @Date: 2024-03-22 09:11:54
 * @LastEditors: cbwu
 * @LastEditTime: 2024-03-26 13:33:42
 * @Description: 坐标系转化
 */
import { Cartesian2, Viewer, Math, Cartographic } from 'cesium'
import type {coordPoint} from '@/utils/map/geometry.ts'

/**
 * 屏幕坐标转笛卡尔坐标
 * @param viewer
 * @param windowPosition :屏幕二维坐标
 * @returns :笛卡尔坐标
 */
function cartesian2ToCartesian3(viewer: Viewer, windowPosition: Cartesian2) {
  const ray = viewer.camera.getPickRay(windowPosition)
  if (ray != undefined) {
    return viewer.scene.globe.pick(ray, viewer.scene)
  } else return undefined
}
/**
 * 屏幕坐标转地理坐标
 * @param viewer
 * @param windowPosition :屏幕坐标
 * @returns :WGS84坐标
 */
function cartesian2ToWGS84(viewer: Viewer, windowPosition: Cartesian2) {
  const cartesian3 = cartesian2ToCartesian3(viewer, windowPosition)
  if (cartesian3 != undefined) {
    const cartographic = Cartographic.fromCartesian(cartesian3)
    const lon = Math.toDegrees(cartographic.longitude) // 经度
    const lat = Math.toDegrees(cartographic.latitude) // 纬度
    const alt = cartographic.height // 高度
    return [lon, lat, alt]
  } else return []
}

/**
 * 十进制经纬度转度分秒。
 * @param lon 经度
 * @param lat 纬度
 * @constructor
 */
function DecimalDegree2DMS_Point(lon: number, lat: number): coordPoint {
  let coord_dms : coordPoint = {
    lon: '',
    lat: ''
  }
  coord_dms.lon = DecimalDegree2DMS(lon)
  coord_dms.lat = DecimalDegree2DMS(lat)
  return coord_dms
}

function DecimalDegree2DMS(decimal_var: number|string): string {
  if(!decimal_var.toString().includes('.'))
    return decimal_var.toString() + '°0\'0\'\''
  let decimalStr = decimal_var.toString().split('.')
  let degreeStr = decimalStr[0]
  if (decimalStr[1]){
    let minutes = Number(decimalStr[1]) * 60 / 1000   //十进制度默认显示小数点后3位
    if(!minutes.toString().includes('.'))
      return degreeStr + '°'+ minutes.toString() +'\'0\'\''
    let minuteSecondsStr = minutes.toString().split('.')
    if (minuteSecondsStr[1]){
      let secondStr = (Number(minuteSecondsStr[1]) * 60).toFixed(0)
      return degreeStr + '°'+ minuteSecondsStr[0] +'\'' + secondStr.slice(0,2) + '\'\''
    }
  }
  return ''
}
export { cartesian2ToCartesian3, cartesian2ToWGS84, DecimalDegree2DMS_Point }