/* diversity-utils.h -
 *
 * Copyright 2007 OpenMoko, Inc.
 * Authored by Chia-I Wu <olv@openmoko.com>
 *
 * 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 _DIVERSITY_UTILS_H_
#define _DIVERSITY_UTILS_H_

#ifndef M_EARTH
#define M_EARTH_RADIUS (6371.0 * 1000.0)
#endif

#ifndef M_PI
#define M_PI (3.14159265358979323846)
#endif

#define DIVERSITY_UNITS(l) ((180.0 * (l) / M_EARTH_RADIUS) / M_PI)

#define DIVERSITY_RECTANGLE_HAVE(rect, px, py)					\
	((rect)->x <= (px) && (rect)->x + (rect)->width  > (px) &&		\
	 (rect)->y <= (py) && (rect)->y + (rect)->height > (py))

#define DIVERSITY_RECTANGLE_CONTAIN(rect1, rect2)				\
	(!((rect2)->x < (rect1)->x     || (rect2)->y < (rect1)->y     ||	\
	   (rect2)->x + (rect2)->width  > (rect1)->x + (rect1)->width ||	\
	   (rect2)->y + (rect2)->height > (rect1)->y + (rect1)->height))

#define DIVERSITY_RECTANGLE_INTERSECT(rect1, rect2)					\
	(DIVERSITY_RECTANGLE_HAVE((rect1), (rect2)->x, (rect2)->y) ||			\
	 DIVERSITY_RECTANGLE_HAVE((rect1), (rect2)->x + (rect2)->width, (rect2)->y) ||	\
	 DIVERSITY_RECTANGLE_HAVE((rect1), (rect2)->x, (rect2)->y + (rect2)->height) ||	\
	 DIVERSITY_RECTANGLE_HAVE((rect1), (rect2)->x + (rect2)->width, (rect2)->y + (rect2)->height))

typedef struct _DiversityRectangle DiversityRectangle;
struct _DiversityRectangle {
	gdouble x, y;
	gdouble width, height;
};

#endif /* _DIVERSITY_UTILS_H_ */