2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2007, 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 /* Used to calculate an offset into an array. Used for
40 dynamically sizing the world. */
41 #define XYOFFSET(x, y) (((y) * WORLD_X) + (x))
44 (((x) < 0) ? ((WORLD_X - (-(x) % WORLD_X)) % WORLD_X) : ((x) % WORLD_X))
46 (((y) < 0) ? ((WORLD_Y - (-(y) % WORLD_Y)) % WORLD_Y) : ((y) % WORLD_Y))
49 coord lx; /* low-range x,y */
51 coord hx; /* high-range x,y */
53 int width; /* range width, height */
57 extern char *xyas(coord x, coord y, natid country);
58 extern char *ownxy(struct sctstr *sp);
59 extern coord xrel(struct natstr *np, coord absx);
60 extern coord yrel(struct natstr *np, coord absy);
61 extern void xyrelrange(struct natstr *np, struct range *src,
63 extern void xyabsrange(struct natstr *np, struct range *src,
65 extern coord strtox(char *str, char **end);
66 extern coord strtoy(char *str, char **end);
67 extern coord xabs(struct natstr *np, coord relx);
68 extern coord yabs(struct natstr *np, coord rely);
69 extern coord xnorm(coord x);
70 extern coord ynorm(coord y);
71 extern int xyinrange(coord x, coord y, struct range *rp);