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 * snxtsct.c: Arrange sector selection using either distance or area
29 * Known contributors to this file:
31 * Markus Armbruster, 2006-2009
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.
50 * Using this function for anything but command arguments is usually
51 * incorrect, because it respects conditionals. Use the snxtsct_FOO()
55 snxtsct(struct nstr_sect *np, char *str)
64 if (!(str = getstring("(sects)? ", buf)))
67 switch (sarg_type(str)) {
69 if (!sarg_area(str, &range))
71 snxtsct_area(np, &range);
74 if (!sarg_range(str, &cx, &cy, &dist))
76 snxtsct_dist(np, cx, cy, dist);
80 * Can't use snxtsct_all(), as it would disclose the real
81 * origin. Use a world-sized area instead.
83 natp = getnatp(player->cnum);
84 range.lx = xabs(natp, -WORLD_X / 2);
85 range.ly = yabs(natp, -WORLD_Y / 2);
86 range.hx = xnorm(range.lx + WORLD_X - 1);
87 range.hy = ynorm(range.ly + WORLD_Y - 1);
89 snxtsct_area(np, &range);
96 n = nstr_comp(np->cond, sizeof(np->cond) / sizeof(*np->cond),
97 EF_SECTOR, player->condarg);
98 np->ncond = n >= 0 ? n : 0;
103 snxtsct_all(struct nstr_sect *np)
105 struct range worldrange;
109 worldrange.hx = WORLD_X - 1;
110 worldrange.hy = WORLD_Y - 1;
111 xysize_range(&worldrange);
112 snxtsct_area(np, &worldrange);
116 snxtsct_area(struct nstr_sect *np, struct range *range)
118 memset(np, 0, sizeof(*np));
122 np->x = np->range.lx - 1;
123 np->y = np->range.ly;
129 snxtsct_rewind(struct nstr_sect *np)
131 np->x = np->range.lx - 1;
132 np->y = np->range.ly;
139 snxtsct_dist(struct nstr_sect *np, coord cx, coord cy, int dist)
141 memset(np, 0, sizeof(*np));
142 xydist_range(cx, cy, dist, &np->range);
148 np->x = np->range.lx - 1;
149 np->y = np->range.ly;
155 xysize_range(struct range *rp)
158 rp->width = WORLD_X + rp->hx + 1 - rp->lx;
160 rp->width = rp->hx + 1 - rp->lx;
161 if (CANT_HAPPEN(rp->width > WORLD_X))
164 rp->height = WORLD_Y + rp->hy + 1 - rp->ly;
166 rp->height = rp->hy + 1 - rp->ly;
167 if (CANT_HAPPEN(rp->height > WORLD_Y))
168 rp->height = WORLD_Y;
172 xydist_range(coord x, coord y, int dist, struct range *rp)
174 if (4 * dist + 1 < WORLD_X) {
175 rp->lx = xnorm(x - 2 * dist);
176 rp->hx = xnorm(x + 2 * dist);
177 rp->width = 4 * dist + 1;
179 rp->lx = xnorm(x - WORLD_X / 2);
180 rp->hx = xnorm(rp->lx + WORLD_X - 1);
184 if (2 * dist + 1 < WORLD_Y) {
185 rp->ly = ynorm(y - dist);
186 rp->hy = ynorm(y + dist);
187 rp->height = 2 * dist + 1;
189 rp->ly = ynorm(y - WORLD_Y / 2);
190 rp->hy = ynorm(rp->ly + WORLD_Y - 1);
191 rp->height = WORLD_Y;