/*
Great Circle utility functions
Copyright (C) 2002-2014 Robert Lipe, robertlipe+source@gpsbabel.org
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111 USA
*/
#ifndef GRTCIRC_H
#define GRTCIRC_H
double gcdist(double lat1, double lon1, double lat2, double lon2);
double heading(double lat1, double lon1, double lat2, double lon2);
double heading_true_degrees(double lat1, double lon1, double lat2, double lon2);
double linedistprj(double lat1, double lon1,
double lat2, double lon2,
double lat3, double lon3,
double* prjlat, double* prjlon,
double* frac);
double linedist(double lat1, double lon1,
double lat2, double lon2,
double lat3, double lon3);
double radtometers(double rads);
double radtomiles(double rads);
void linepart(double lat1, double lon1,
double lat2, double lon2,
double frac,
double* reslat, double* reslon);
/* Degrees to radians */
#define DEG(x) ((x)*180.0/M_PI)
/* Radians to degrees */
#define RAD(x) ((x)*M_PI/180.0)
#endif