package com.flightfeather.uav.common.utils
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import kotlin.math.PI
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import kotlin.math.cos
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import kotlin.math.sin
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object MapUtil {
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private const val Ea = 6378137 //赤道半径
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private const val Eb = 6356725 //极半径
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/**
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* 根据坐标点、距离和角度，获取另一个坐标
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* @param pos 坐标点(GPS系)
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* @param len 距离（米）
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* @param radian 弧度
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*/
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fun getPointByLen(pos: Pair<Double, Double>, len: Double, radian: Double): Pair<Double, Double> {
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val dx = len * sin(radian)
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val dy = len * cos(radian)
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val ec = Eb + (Ea - Eb) * (90.0 - pos.second) / 90.0
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val ed = ec * cos(pos.second * PI / 180)
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val lng = (dx / ed + pos.first * PI / 180.0) * 180.0 / PI
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val lat = (dy / ec + pos.second * PI / 180.0) * 180.0 / PI
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return Pair(lng, lat)
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}
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}
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