c - Find compass heading with geo-cordinates -


i find compass head 2 geo location. writing c application. write function like,

double calculateheading(double lat1, double long1, double lat2, double long2) {    double latitude = lat1 - lat2;    double longitude = long1 - long2;    double angle = 0;     printf("\n#################################\n");    printf("lat1: %lf lat2: %lf\n", lat1, lat2);    printf("long1: %lf long2: %lf\n", long1, long2);    printf("lat diff: %lf\n", latitude);    printf("long diff: %lf\n", longitude);    angle = atan2(longitude, latitude);    angle = radianstodegrees(angle);    printf("angle: %lf\n", angle);    printf("#################################\n");    return angle; }

but not works on same location. here passing lat1, long1, lat2, long2 in degree. can me out here?

updated code http://www.movable-type.co.uk/scripts/latlong.html working,

#define degreestoradians(angledegrees) (angledegrees * m_pi / 180.0) #define radianstodegrees(angleradians) (angleradians * 180.0 / m_pi)  double calculateheading(double lat1, double lon1, double lat2, double lon2) {    double lat1_rad = degreestoradians(lat1);    double lat2_rad = degreestoradians(lat2);    double difflon = lon2-lon1;    double dlon = degreestoradians(difflon);    double y = sin(dlon) * cos(lat2_rad);    double x = cos(lat1_rad) * sin(lat2_rad) - sin(lat1_rad) * cos(lat2_rad) * cos(dlon);    double angle = 0;     angle = atan2(y,x);    printf("angle: %lf\n", radianstodegrees(fmod(angle + 360.0, 360.0)));    return angle; } 

angle = atan2(y,x); printf("angle: %lf\n", radianstodegrees(fmod(angle + 360.0, 360.0)));

here have got radian value of angle, adding 360 degrees nonsense. possible corrections:

radianstodegrees(fmod(angle + 2*pi, 2*pi)) or  fmod(radianstodegrees(angle) + 360.0, 360.0)

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