geodesic.c File Reference

#include <math.h>
#include <grass/gis.h>
#include "pi.h"

Include dependency graph for geodesic.c:

Go to the source code of this file.

Defines
#define	SWAP(a, b)   temp=a;a=b;b=temp
Functions
int	G_begin_geodesic_equation (double lon1, double lat1, double lon2, double lat2)
double	G_geodesic_lat_from_lon (double lon)

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Define Documentation

#define SWAP	(	a,
		b		)	temp=a;a=b;b=temp

Definition at line 31 of file geodesic.c.

Referenced by G_begin_geodesic_equation(), and G_intersect_line_segments().

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Function Documentation

int G_begin_geodesic_equation	(	double	lon1,
		double	lat1,
		double	lon2,
		double	lat2
	)

Definition at line 39 of file geodesic.c.

References Radians, and SWAP.

double G_geodesic_lat_from_lon

(

double

lon

)

Definition at line 75 of file geodesic.c.

References Degrees, and Radians.