2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2011, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure, Markus Armbruster
6 * Empire 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 3 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, see <http://www.gnu.org/licenses/>.
21 * See files README, COPYING and CREDITS in the root of the source
22 * tree for related information and legal notices. It is expected
23 * that future projects/authors will amend these files as needed.
27 * path.h: Definitions for directions, paths, etc.
29 * Known contributors to this file:
30 * Markus Armbruster, 2005-2011
39 /* direction indices */
56 enum p_mode { /* How to find path to destination */
58 P_FLYING, /* use BestAirPath() */
59 P_SAILING /* use BestShipPath() */
62 /* src/lib/global/dir.c */
63 extern signed char dirindex['z'-'a'+1];
64 extern int diroff[DIR_MAP+1][2];
65 extern char dirch[DIR_MAP+2];
66 extern char *routech[DIR_LAST+1];
68 /* src/lib/common/bestpath.c */
69 extern char *bestownedpath(char *, char *, int, int, int, int, int);
71 /* src/lib/common/findpath.c */
72 extern void path_find_from(coord, coord, natid, int);
73 extern double path_find_to(coord, coord);
74 extern double path_find(coord, coord, coord, coord, natid, int);
75 extern size_t path_find_route(char *, size_t, coord, coord, coord, coord);
77 /* src/lib/common/path.c */
78 extern void bp_enable_cachepath(void);
79 extern void bp_disable_cachepath(void);
80 extern void bp_clear_cachepath(void);
81 extern char *BestDistPath(char *, struct sctstr *, struct sctstr *,
83 extern char *BestLandPath(char *, struct sctstr *, struct sctstr *,
85 extern char *BestShipPath(char *, int, int, int, int, int);
86 extern char *BestAirPath(char *, int, int, int, int);
87 extern double pathcost(struct sctstr *, char *, int);
89 /* src/lib/subs/paths.c */
90 extern char *getpath(char *, char *, coord, coord, int, int, enum p_mode);
91 extern double fcost(struct sctstr *, natid);
92 extern double ncost(struct sctstr *, natid);
93 extern double pathtoxy(char *, coord *, coord *,
94 double (*)(struct sctstr *, natid));
95 extern int chkdir(char, int, int);
96 extern int diridx(char);
97 extern void direrr(char *, char *, char *);
98 extern void pathrange(coord, coord, char *, int, struct range *);
100 extern double sector_mcost(struct sctstr *, int);
101 extern double speed_factor(double, int);
103 #define MAX_PATH_LEN 1024