C library for Geodesics  2.1
inverse.c
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1 /**
2  * @file inverse.c
3  * @brief A test program for geod_inverse()
4  **********************************************************************/
5 
6 #include <stdio.h>
7 #include "geodesic.h"
8 
9 #if defined(_MSC_VER)
10 /* Squelch warnings about scanf */
11 # pragma warning (disable: 4996)
12 #endif
13 
14 /**
15  * A simple program to solve the inverse geodesic problem.
16  *
17  * This program reads in lines with lat1, lon1, lat2, lon2 and prints out lines
18  * with azi1, azi2, s12 (for the WGS84 ellipsoid).
19  **********************************************************************/
20 
21 int main() {
22  double a = 6378137, f = 1/298.257223563; /* WGS84 */
23  double lat1, lon1, azi1, lat2, lon2, azi2, s12;
24  struct geod_geodesic g;
25 
26  geod_init(&g, a, f);
27  while (scanf("%lf %lf %lf %lf", &lat1, &lon1, &lat2, &lon2) == 4) {
28  geod_inverse(&g, lat1, lon1, lat2, lon2, &s12, &azi1, &azi2);
29  printf("%.15f %.15f %.10f\n", azi1, azi2, s12);
30  }
31  return 0;
32 }
API for the geodesic routines in C.
void GEOD_DLL geod_init(struct geod_geodesic *g, double a, double f)
void GEOD_DLL geod_inverse(const struct geod_geodesic *g, double lat1, double lon1, double lat2, double lon2, double *ps12, double *pazi1, double *pazi2)
int main()
Definition: inverse.c:21
double f
Definition: geodesic.h:88
double a
Definition: geodesic.h:87