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/* Definitions for directions of the compass.
Copyright (C) 1987, 1988, 1989, 1991, 1992, 1993, 1994, 1996 Stanley T. Shebs.
Xconq 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, or (at your option)
any later version. See the file COPYING. */
/* The terrain model is based on hexes arranged in horizontal rows. This
means that although east and west remain intact, the concepts of north
and south have vanished. */
/* Unfortunately, not all hex-dependent definitions are here. Pathfinding
code has some knowledge of hexes also, as does map generation and
probably parts of the machine player code. */
#define NUMDIRS 6
/* Symbols naming the directions. */
#define NORTHEAST 0
#define EAST 1
#define SOUTHEAST 2
#define SOUTHWEST 3
#define WEST 4
#define NORTHWEST 5
/* String names for the directions. */
#define DIRNAMES { "NE", "E", "SE", "SW", "W", "NW" }
/* Conversions from directions to x,y deltas. */
#define DIRX { 0, 1, 1, 0, -1, -1 }
#define DIRY { 1, 0, -1, -1, 0, 1 }
/* Iteration over the different directions. */
#define for_all_directions(dir) for ((dir) = 0; (dir) < NUMDIRS; ++(dir))
#define for_all_directions_randomly(dir,tmp) \
for ((tmp) = 0, (dir) = xrandom(NUMDIRS); (tmp) < NUMDIRS; ++(tmp), (dir) = ((dir) + 1) % NUMDIRS)
/* Formulas for relative directions. */
#define left_dir(d) (((d) + 5) % NUMDIRS)
#define right_dir(d) (((d) + 1) % NUMDIRS)
#define opposite_dir(d) (((d) + 3) % NUMDIRS)
#define angle_with(d1, d2) \
min((d1 - d2 + NUMDIRS) % NUMDIRS, (d2 - d1 + NUMDIRS) % NUMDIRS)
/* To generate a random direction. */
#define random_dir() (xrandom(NUMDIRS))
extern char *dirnames[];
extern int dirx[], diry[];
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