2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2004, 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 * snxtsct.c: Arrange sector selection using either distance or area
30 * Known contributors to this file:
42 #include "prototypes.h"
46 * setup the nstr_sect structure for sector selection.
47 * can select on either NS_ALL, NS_AREA, or NS_RANGE
48 * iterate thru the "condarg" string looking
49 * for arguments to compile into the nstr.
52 snxtsct(register struct nstr_sect *np, s_char *str)
60 if (str == 0 || *str == 0) {
61 if ((str = getstring("(sects)? ", buf)) == 0)
68 wr.width = wr.height = 0;
69 switch (sarg_type(str)) {
71 if (!sarg_area(str, &range))
73 snxtsct_area(np, &range);
76 if (!sarg_range(str, &cx, &cy, &dist))
78 snxtsct_dist(np, cx, cy, dist);
81 /* fake "all" by doing a world-sized area query */
82 snxtsct_area(np, &wr);
87 if (player->condarg == 0)
89 n = nstr_comp(np->cond, sizeof(np->cond) / sizeof(*np->cond),
90 EF_SECTOR, player->condarg);
91 np->ncond = n >= 0 ? n : 0;
96 snxtsct_all(struct nstr_sect *np)
98 struct range worldrange;
100 worldrange.lx = -WORLD_X / 2;
101 worldrange.ly = -WORLD_Y / 2;
102 worldrange.hx = WORLD_X / 2;
103 worldrange.hy = WORLD_Y / 2;
104 worldrange.width = worldrange.height = 0;
105 snxtsct_area(np, &worldrange);
109 snxtsct_area(register struct nstr_sect *np, struct range *range)
111 memset(np, 0, sizeof(*np));
116 np->x = np->range.lx - 1;
117 np->y = np->range.ly;
120 xysize_range(&np->range);
121 ef_zapcache(EF_SECTOR);
125 snxtsct_rewind(struct nstr_sect *np)
127 np->x = np->range.lx - 1;
128 np->y = np->range.ly;
132 ef_zapcache(EF_SECTOR);
136 snxtsct_dist(register struct nstr_sect *np, coord cx, coord cy, int dist)
138 memset(np, 0, sizeof(*np));
139 xydist_range(cx, cy, dist, &np->range);
146 np->x = np->range.lx - 1;
147 np->y = np->range.ly;
151 /* This function is now done elsewhere. */
152 /* It was not doing the right thing when the world was small */
153 xysize_range(&np->range);
155 ef_zapcache(EF_SECTOR);
159 xysize_range(register struct range *rp)
161 if (rp->lx >= rp->hx)
162 rp->width = WORLD_X + rp->hx - rp->lx;
164 rp->width = rp->hx - rp->lx;
166 /* This is a necessary check for small, hitech worlds. */
167 if (rp->width > WORLD_X)
170 if (rp->ly >= rp->hy)
171 rp->height = WORLD_Y + rp->hy - rp->ly;
173 rp->height = rp->hy - rp->ly;
175 /* This is a necessary check for small, hitech worlds. */
176 if (rp->height > WORLD_Y)
177 rp->height = WORLD_Y;
181 /* This is called also called in snxtitem.c */
183 xydist_range(coord x, coord y, register int dist, struct range *rp)
185 if (dist < WORLD_X / 4) {
186 rp->lx = xnorm((coord)(x - 2 * dist));
187 rp->hx = xnorm((coord)(x + 2 * dist) + 1);
188 rp->width = 4 * dist + 1;
190 /* Range is larger than the world */
191 /* Make sure we get lx in the right place. */
192 rp->lx = xnorm((coord)(x - WORLD_X / 2));
193 rp->hx = xnorm((coord)(rp->lx + WORLD_X - 1));
197 if (dist < WORLD_Y / 2) {
198 rp->ly = ynorm((coord)(y - dist));
199 rp->hy = ynorm((coord)(y + dist) + 1);
200 rp->height = 2 * dist + 1;
202 /* Range is larger than the world */
203 rp->ly = ynorm((coord)(y - WORLD_Y / 2));
204 rp->hy = ynorm((coord)(rp->ly + WORLD_Y - 1));
205 rp->height = WORLD_Y;