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/**
文件描述：空间分析方法
创建时间：
创建人：
*/
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
}