2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2008, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * See files README, COPYING and CREDITS in the root of the source
23 * tree for related information and legal notices. It is expected
24 * that future projects/authors will amend these files as needed.
28 * xy.h: Constants having to do with world locations.
30 * Known contributors to this file:
39 /* Return the number of sectors in the world */
40 #define WORLD_SZ() (WORLD_X * WORLD_Y / 2)
42 /* Fast version of sctoff() for normalized arguments */
43 #define XYOFFSET(x, y) (((y) * WORLD_X + (x)) / 2)
46 (((x) < 0) ? (WORLD_X - 1 - ((-(x) - 1) % WORLD_X)) : ((x) % WORLD_X))
48 (((y) < 0) ? (WORLD_Y - 1 - ((-(y) - 1) % WORLD_Y)) : ((y) % WORLD_Y))
51 coord lx, ly; /* low-range x,y (inclusive) */
52 coord hx, hy; /* high-range x,y (inclusive) */
56 extern char *xyas(coord x, coord y, natid country);
57 extern char *ownxy(struct sctstr *sp);
58 extern coord xrel(struct natstr *np, coord absx);
59 extern coord yrel(struct natstr *np, coord absy);
60 extern void xyrelrange(struct natstr *np, struct range *src,
62 extern void xyabsrange(struct natstr *np, struct range *src,
64 extern coord strtox(char *str, char **end);
65 extern coord strtoy(char *str, char **end);
66 extern coord xabs(struct natstr *np, coord relx);
67 extern coord yabs(struct natstr *np, coord rely);
68 extern coord xnorm(coord x);
69 extern coord ynorm(coord y);
70 extern int xyinrange(coord x, coord y, struct range *rp);