/*
 *   GRacer
 *
 *   Copyright (C) 1999 Takashi Matsuda <matsu@users.sourceforge.net>
 *
 * 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 02111-1307
 * USA
 */

#ifndef __GRACER_ANGLE_H__
#define __GRACER_ANGLE_H__

#define DEG(a)  (180.0 / M_PI * (a))
#define RAD(a)  (M_PI / 180.0 * (a))

#ifdef __cplusplus
extern "C" {
#endif
#if 0
}
#endif

/* angle is represented as degree */

double gr_angle_add_deg (double deg1, double deg2);
#define gr_angle_sub_deg(deg1,deg2)	gr_angle_add_deg((deg1),-(deg2))

/* angle is represented as radian */

double gr_angle_add_rad (double rad1, double rad2);
#define gr_angle_sub_rad(rad1,rad2)	gr_angle_add_rad((rad1),-(rad2))

#ifdef __cplusplus
}
#endif

#endif /* __GRACER_ANGLE_H__ */