2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2006, 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 the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
23 * related information and legal notices. It is expected that any future
24 * projects/authors will amend these files as needed.
28 * xy.h: Constants having to do with world locations.
30 * Known contributors to this file:
40 /* Used to calculate an offset into an array. Used for
41 dynamically sizing the world. */
42 #define XYOFFSET(x, y) ((y * WORLD_X) + x)
44 #define XNORM(x) (((x)<0) ? ((WORLD_X-(-(x)%WORLD_X))%WORLD_X) : ((x)%WORLD_X))
45 #define YNORM(y) (((y)<0) ? ((WORLD_Y-(-(y)%WORLD_Y))%WORLD_Y) : ((y)%WORLD_Y))
48 coord lx; /* low-range x,y */
50 coord hx; /* high-range x,y */
52 int width; /* range width, height */
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);