2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2000, 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)
61 if (str == 0 || *str == 0) {
62 if ((str = getstring("(sects)? ", buf)) == 0)
69 wr.width = wr.height = 0;
70 switch (sarg_type(str)) {
72 if (!sarg_area(str, &range))
74 snxtsct_area(np, &range);
77 if (!sarg_range(str, &cx, &cy, &dist))
79 snxtsct_dist(np, cx, cy, dist);
82 /* fake "all" by doing a world-sized area query */
83 snxtsct_area(np, &wr);
88 if (player->condarg == 0)
91 while ((cp = nstr_comp(np->cond, &np->ncond, EF_SECTOR, cp)) && *cp) ;
98 snxtsct_all(struct nstr_sect *np)
100 struct range worldrange;
102 worldrange.lx = -WORLD_X / 2;
103 worldrange.ly = -WORLD_Y / 2;
104 worldrange.hx = WORLD_X / 2;
105 worldrange.hy = WORLD_Y / 2;
106 worldrange.width = worldrange.height = 0;
107 snxtsct_area(np, &worldrange);
111 snxtsct_area(register struct nstr_sect *np, struct range *range)
113 memset(np, 0, sizeof(*np));
118 np->x = np->range.lx - 1;
119 np->y = np->range.ly;
122 xysize_range(&np->range);
123 ef_zapcache(EF_SECTOR);
127 snxtsct_rewind(struct nstr_sect *np)
129 np->x = np->range.lx - 1;
130 np->y = np->range.ly;
134 ef_zapcache(EF_SECTOR);
138 snxtsct_dist(register struct nstr_sect *np, coord cx, coord cy, int dist)
140 memset(np, 0, sizeof(*np));
141 xydist_range(cx, cy, dist, &np->range);
148 np->x = np->range.lx - 1;
149 np->y = np->range.ly;
153 /* This function is now done elsewhere. */
154 /* It was not doing the right thing when the world was small */
155 xysize_range(&np->range);
157 ef_zapcache(EF_SECTOR);
161 xysize_range(register struct range *rp)
163 if (rp->lx >= rp->hx)
164 rp->width = WORLD_X + rp->hx - rp->lx;
166 rp->width = rp->hx - rp->lx;
168 /* This is a necessary check for small, hitech worlds. */
169 if (rp->width > WORLD_X)
172 if (rp->ly >= rp->hy)
173 rp->height = WORLD_Y + rp->hy - rp->ly;
175 rp->height = rp->hy - rp->ly;
177 /* This is a necessary check for small, hitech worlds. */
178 if (rp->height > WORLD_Y)
179 rp->height = WORLD_Y;
183 /* This is called also called in snxtitem.c */
185 xydist_range(coord x, coord y, register int dist, struct range *rp)
187 if (dist < WORLD_X / 4) {
188 rp->lx = xnorm((coord)(x - 2 * dist));
189 rp->hx = xnorm((coord)(x + 2 * dist) + 1);
190 rp->width = 4 * dist + 1;
192 /* Range is larger than the world */
193 /* Make sure we get lx in the right place. */
194 rp->lx = xnorm((coord)(x - WORLD_X / 2));
195 rp->hx = xnorm((coord)(rp->lx + WORLD_X - 1));
199 if (dist < WORLD_Y / 2) {
200 rp->ly = ynorm((coord)(y - dist));
201 rp->hy = ynorm((coord)(y + dist) + 1);
202 rp->height = 2 * dist + 1;
204 /* Range is larger than the world */
205 rp->ly = ynorm((coord)(y - WORLD_Y / 2));
206 rp->hy = ynorm((coord)(rp->ly + WORLD_Y - 1));
207 rp->height = WORLD_Y;