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 * xy.c: x-y related conversion routines
30 * Known contributors to this file:
47 * return pointer to a string containing the x,y
48 * coords as desired by a particular target country.
51 xyas(coord x, coord y, natid country)
55 np = getnatp(country);
56 return prbuf("%d,%d", xrel(np, x), yrel(np, y));
60 ownxy(struct sctstr *sp)
62 return xyas(sp->sct_x, sp->sct_y, sp->sct_own);
66 xrel(struct natstr *np, coord absx)
70 if ((np->nat_stat & STAT_ABS) == 0) {
71 x = XNORM(absx - np->nat_xorg);
77 else if (x < -WORLD_X/2)
83 yrel(struct natstr *np, coord absy)
87 if ((np->nat_stat & STAT_ABS) == 0) {
88 y = YNORM(absy - np->nat_yorg);
94 else if (y < -WORLD_Y/2)
100 xyrelrange(struct natstr *np, struct range *src, struct range *dst)
102 dst->lx = xrel(np, src->lx);
103 dst->hx = xrel(np, src->hx);
104 dst->ly = yrel(np, src->ly);
105 dst->hy = yrel(np, src->hy);
106 dst->width = src->width;
107 dst->height = src->height;
111 xyabsrange(struct natstr *np, struct range *src, struct range *dst)
113 dst->lx = xabs(np, src->lx);
114 dst->hx = xabs(np, src->hx);
115 dst->ly = yabs(np, src->ly);
116 dst->hy = yabs(np, src->hy);
117 dst->width = src->width;
118 dst->height = src->height;
122 inputxy(coord *xp, coord *yp, natid cn)
132 xabs(struct natstr *np, coord relx)
134 if ((np->nat_stat & STAT_ABS) == 0)
135 relx += np->nat_xorg;
140 yabs(struct natstr *np, coord rely)
142 if ((np->nat_stat & STAT_ABS) == 0)
143 rely += np->nat_yorg;
148 sctoff(coord x, coord y)
151 logerror("%d,%d is an invalid sector specification!\n", x, y);
154 return (YNORM(y) * WORLD_X + XNORM(x))/2;
158 xnorm(register coord x)
161 x = WORLD_X - (-x % WORLD_X);
166 ynorm(register coord y)
169 y = WORLD_Y - (-y % WORLD_Y);
174 xyinrange(coord x, coord y, struct range *rp)
176 if (rp->lx < rp->hx) {
177 /* xrange doesn't wrap */
178 if (x < rp->lx || x > rp->hx)
181 if (x < rp->lx && x > rp->hx)
184 if (rp->ly < rp->hy) {
185 /* yrange doesn't wrap */
186 if (y < rp->ly || y > rp->hy)
189 if (y < rp->ly && y > rp->hy)
197 prbuf(s_char *format, ...)
199 static int nbuf = -1;
200 static s_char buf[20][1024];
206 va_start(ap, format);
207 (void) vsprintf(buf[nbuf], format, ap);