#pragma once
#ifndef _LOCATION_TOOL_H_
#define _LOCATION_TOOL_H_

#include <stddef.h>

#ifndef PI
//#define PI 3.14159265358979323846
#endif // !PI

#ifndef EARTH_RADIUS	
#define EARTH_RADIUS   6371008.8	
#endif

typedef struct DoublePair {
	double x;
	double y;
} DoublePair;
typedef DoublePair PlaneCoordinate;

typedef struct LatLng{
	double lat;
	double lon;
} LatLng_t;

typedef struct DoublePairList{
	double *x;
	double *y;
	size_t length;
} DoublePairList;
typedef struct LocationList{
	double *lat;
	double *lon;
	size_t length;
} LocationList;

LatLng     ProjPointOfLatLng(LatLng point, LatLng linePointA, LatLng linePointB);
DoublePair ProjPoint(DoublePair point, DoublePair linePointA, DoublePair linePointB);

//PlaneCoordinate WGS84_XYZ(const LatLng lla);
double          CalculateDistance(LatLng pointA, LatLng pointB);

#endif // !_LOCATION_TOOL_H_