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_subs.c: arrange sector selection using either distance or area
30 * Known contributors to this file:
34 * XXX we can *almost* treat sectors as items, but not quite.
35 * Items are retrieved using id's, and sectors still use x,y.
48 snxtsct_all(struct nstr_sect *np)
50 struct range worldrange;
52 worldrange.lx = -WORLD_X/2;
53 worldrange.ly = -WORLD_Y/2;
54 worldrange.hx = WORLD_X/2;
55 worldrange.hy = WORLD_Y/2;
56 worldrange.width = worldrange.height = 0;
57 snxtsct_area(np, &worldrange);
61 snxtsct_area(register struct nstr_sect *np, struct range *range)
63 bzero((s_char *)np, sizeof(*np));
68 np->x = np->range.lx - 1;
72 xysize_range(&np->range);
73 ef_zapcache(EF_SECTOR);
77 snxtsct_rewind(struct nstr_sect *np)
79 np->x = np->range.lx - 1;
84 ef_zapcache(EF_SECTOR);
88 snxtsct_dist(register struct nstr_sect *np, coord cx, coord cy, int dist)
90 bzero((s_char *)np, sizeof(*np));
91 xydist_range(cx, cy, dist, &np->range);
98 np->x = np->range.lx - 1;
103 /* This function is now done elsewhere. */
104 /* It was not doing the right thing when the world was small */
105 xysize_range(&np->range);
107 ef_zapcache(EF_SECTOR);
111 xysize_range(register struct range *rp)
113 if (rp->lx >= rp->hx)
114 rp->width = WORLD_X + rp->hx - rp->lx;
116 rp->width = rp->hx - rp->lx;
118 /* This is a necessary check for small, hitech worlds. */
119 if (rp->width > WORLD_X)
122 if (rp->ly >= rp->hy)
123 rp->height = WORLD_Y + rp->hy - rp->ly;
125 rp->height = rp->hy - rp->ly;
127 /* This is a necessary check for small, hitech worlds. */
128 if (rp->height > WORLD_Y)
129 rp->height = WORLD_Y;
133 /* This is called also called in snxtitem.c */
135 xydist_range(coord x, coord y, register int dist, struct range *rp)
137 if (dist < WORLD_X/4) {
138 rp->lx = xnorm((coord)(x - 2 * dist));
139 rp->hx = xnorm((coord)(x + 2 * dist) + 1);
140 rp->width = 4 * dist + 1;
142 /* Range is larger than the world */
143 /* Make sure we get lx in the right place. */
144 rp->lx = xnorm((coord)(x - WORLD_X/2));
145 rp->hx = xnorm((coord)(rp->lx + WORLD_X - 1));
149 if (dist < WORLD_Y/2) {
150 rp->ly = ynorm((coord)(y - dist));
151 rp->hy = ynorm((coord)(y + dist) + 1);
152 rp->height = 2 * dist + 1;
154 /* Range is larger than the world */
155 rp->ly = ynorm((coord)(y - WORLD_Y/2));
156 rp->hy = ynorm((coord)(rp->ly + WORLD_Y - 1));
157 rp->height = WORLD_Y;