// Copyright 2019 github.com. All rights reserved.
// Use of this source code is governed by github.com.

package util

import "math"

// GeoBaidu2Gaode 将百度转为高德的经纬度坐标
//  输入：百度的纬经度, 纬度lat，经度lon
//  输出：高德的纬经度, 纬度，经度
func GeoBaidu2Gaode(lat float64, lon float64) (float64, float64) {
	PI := 3.14159265358979324 * 3000.0 / 180.0
	x := lon - 0.0065
	y := lat - 0.006
	z := math.Sqrt(x*x+y*y) - 0.00002*math.Sin(y*PI)
	theta := math.Atan2(y, x) - 0.000003*math.Cos(x*PI)

	return z * math.Sin(theta), z * math.Cos(theta)
}