/**
 文件描述：空间分析方法
 创建时间：2024/4/15 9:52
 创建人：Zhaipeixiu
 */

import {getDistance, getElevation} from "@/utils/map/geocomputation.ts";
import {Cartesian3, Viewer} from "cesium";

/**
 * 地形剖面分析数值计算
 * @param viewer 地图Viewer
 * @param start 起点
 * @param end 终点
 * @param interval 线段采样间隔 m为单位
 * @return 从起点至终点剖面线的海拔高度数组
 */
export function elevationProfile(viewer: Viewer, start:Cartesian3, end:Cartesian3, interval: number)
{
 let breakPointsHeight = []
 // 计算首尾点距离 m
 let totalLen = getDistance(start, end) * 1000
 console.log('总距离',totalLen)
 // 获取起点高度
 breakPointsHeight.push(getElevation(viewer, start))
 //断点数量
 let breakNum = Math.floor(totalLen/interval)
 console.log('断点数量',breakNum)
 // 如果采样间隔小于首尾点距离，则获取每个断点的坐标 并获取其高度
 if(breakNum>=1){
  for (let i = 1; i <= breakNum; i++) {
   let breakP = Cartesian3.lerp(start, end, i/breakNum, new Cartesian3())
   breakPointsHeight.push(getElevation(viewer, breakP))

   console.log(`断点${i}高度：`,getElevation(viewer, breakP))
  }
 }
 // 获取终点高度
 breakPointsHeight.push(getElevation(viewer, end))
 return breakPointsHeight
}