2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2010, 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 files README, COPYING and CREDITS in the root of the source
23 * tree for related information and legal notices. It is expected
24 * that future projects/authors will amend these files as needed.
28 * sona.c: Sonar from a sub (or other sonar-equipped ship)
30 * Known contributors to this file:
45 static int blankrow(char *);
50 struct nstr_item ni, nit;
67 /* Where these are used are non-re-entrant, so we keep 'em around */
68 static char **rad = NULL;
69 static char *radbuf = NULL;
70 static signed char **vis = NULL;
71 static signed char *visbuf = NULL;
73 if (!snxtitem(&ni, EF_SHIP, player->argp[1], NULL))
76 radbuf = malloc(WORLD_Y * MAPWIDTH(1));
78 visbuf = malloc(WORLD_Y * MAPWIDTH(1));
80 rad = malloc(WORLD_Y * sizeof(char *));
82 for (x = 0; x < WORLD_Y; x++) {
83 rad[x] = &radbuf[(WORLD_X + 1) * x];
88 vis = malloc(WORLD_Y * sizeof(signed char *));
90 for (x = 0; x < WORLD_Y; x++) {
91 vis[x] = &visbuf[(WORLD_X + 1) * x];
95 if (!radbuf || !visbuf || !rad || !vis) {
96 pr("Memory error, tell the deity.\n");
97 logerror("malloc failed in sona\n");
100 while (nxtitem(&ni, &ship)) {
103 mcp = &mchr[(int)ship.shp_type];
104 if (!(mcp->m_flags & M_SONAR))
106 getsect(ship.shp_x, ship.shp_y, §);
107 if (sect.sct_type != SCT_WATER)
109 range = (int)techfact(ship.shp_tech, mcp->m_vrnge);
110 srange = MIN(7, 7 * range * ship.shp_effic / 200);
111 pr("%s at %s efficiency %d%%, max range %d\n",
113 xyas(ship.shp_x, ship.shp_y, player->cnum),
114 ship.shp_effic, srange);
115 snxtsct_dist(&ns, ship.shp_x, ship.shp_y, srange);
116 blankfill(radbuf, &ns.range, 1);
117 while (nxtsct(&ns, §)) {
118 if (player->owner || sect.sct_type == SCT_WATER)
119 rad[ns.dy][ns.dx] = dchr[sect.sct_type].d_mnem;
121 rad[ns.dy][ns.dx] = '?';
124 snxtsct_dist(&ns, ship.shp_x, ship.shp_y, srange);
125 cx = deltx(&ns.range, ship.shp_x);
126 cy = delty(&ns.range, ship.shp_y);
127 while (nxtsct(&ns, §)) {
128 if (!line_of_sight(rad, cx, cy, ns.dx, ns.dy)) {
129 rad[ns.dy][ns.dx] = ' ';
132 if (ship.shp_tech >= 310 && sect.sct_type == SCT_WATER) {
133 if (sect.sct_mines) {
134 pr("Sonar detects %d mines in %s!\n",
136 xyas(sect.sct_x, sect.sct_y, player->cnum));
137 rad[ns.dy][ns.dx] = 'X';
140 changed |= map_set(player->cnum, sect.sct_x, sect.sct_y,
141 rad[ns.dy][ns.dx], 0);
144 memset(visbuf, 0, (WORLD_Y * (WORLD_X + 1)));
145 snxtitem_dist(&nit, EF_SHIP, ship.shp_x, ship.shp_y, range);
146 while (nxtitem(&nit, &targ)) {
147 if (targ.shp_own == player->cnum || targ.shp_own == 0)
149 tmcp = &mchr[(int)targ.shp_type];
150 visib = shp_visib(&targ);
151 pingrange = MIN(7, MAX(visib, 10) * range / 10);
152 vrange = pingrange * ship.shp_effic / 200;
153 dist = mapdist(targ.shp_x, targ.shp_y, ship.shp_x, ship.shp_y);
154 pingrange = (MAX(pingrange, 2) * targ.shp_effic) / 100;
155 if (dist > pingrange)
157 if (tmcp->m_flags & M_SONAR && targ.shp_own) {
158 natp = getnatp(targ.shp_own);
159 if (natp->nat_flags & NF_SONAR)
161 "Sonar ping from %s detected by %s!\n",
162 xyas(ship.shp_x, ship.shp_y,
163 targ.shp_own), prship(&targ));
164 if (targ.shp_rflags & RET_SONARED) {
165 retreat_ship(&targ, 's');
166 putship(targ.shp_uid, &targ);
171 x = deltx(&ns.range, (int)targ.shp_x);
172 y = delty(&ns.range, (int)targ.shp_y);
173 if (rad[y][x] != dchr[SCT_WATER].d_mnem && rad[y][x] != 'X')
175 if (tmcp->m_flags & M_SUB &&
176 relations_with(targ.shp_own, player->cnum) < FRIENDLY) {
177 if (mcp->m_vrnge + visib < 8)
178 pr("Sonar detects sub #%d @ %s\n",
180 xyas(targ.shp_x, targ.shp_y, player->cnum));
181 else if (mcp->m_vrnge + visib < 10)
182 pr("Sonar detects %s @ %s\n",
184 xyas(targ.shp_x, targ.shp_y, player->cnum));
186 pr("Sonar detects %s %s @ %s\n",
187 cname(targ.shp_own), prship(&targ),
188 xyas(targ.shp_x, targ.shp_y, player->cnum));
190 pr("Sonar detects %s %s @ %s\n",
191 cname(targ.shp_own), prship(&targ),
192 xyas(targ.shp_x, targ.shp_y, player->cnum));
194 if (visib > vis[y][x]) {
196 /* &~0x20 makes it a cap letter */
197 rad[y][x] = (*mchr[(int)targ.shp_type].m_name) & ~0x20;
200 if (!player->argp[2]) {
202 for (row = 0; row < ns.range.height; row++)
203 if (!blankrow(rad[row]))
204 pr("%s\n", rad[row]);
210 writemap(player->cnum);
215 plane_sona(struct emp_qelem *plane_list, int x, int y,
216 struct shiplist **head)
219 struct plchrstr *pcp;
220 struct mchrstr *tmcp;
221 struct shpstr *targ, s;
223 struct emp_qelem *qp;
224 struct emp_qelem *next;
233 getsect(x, y, §);
234 if ((sect.sct_type != SCT_WATER) && (sect.sct_type != SCT_HARBR))
236 for (qp = plane_list->q_forw; qp != plane_list; qp = next) {
238 ip = (struct plist *)qp;
241 if (!(pcp->pl_flags & P_A)) /* if it isn't an ASW plane */
243 range = (int)techfact(pp->pln_tech, (100.0 - pln_acc(pp)) / 10.0);
244 for (i = 0; getship(i, &s); i++) {
246 if (targ->shp_own == pp->pln_own || targ->shp_own == 0)
248 if (on_shiplist(targ->shp_uid, *head))
250 tmcp = &mchr[(int)targ->shp_type];
251 if (!(tmcp->m_flags & M_SUB))
253 if (roll(100) > pln_identchance(pp, shp_hardtarget(targ),
256 vis = shp_visib(targ);
257 pingrange = MAX(vis, 10) * range / 10;
258 vrange = pingrange * (pp->pln_effic / 200.0);
259 dist = mapdist(targ->shp_x, targ->shp_y, x, y);
260 pingrange = (MAX(pingrange, 2) * targ->shp_effic);
261 pingrange = roundavg(pingrange / 100.0);
262 if (dist > pingrange)
264 if (tmcp->m_flags & M_SONAR && targ->shp_own) {
265 natp = getnatp(targ->shp_own);
266 if (natp->nat_flags & NF_SONAR)
268 "Sonar ping from %s detected by %s!\n",
269 xyas(x, y, targ->shp_own), prship(targ));
273 add_shiplist(targ->shp_uid, head);
275 pr("Sonar contact in %s\n", xyas(x, y, player->cnum));
278 if (relations_with(targ->shp_own, pp->pln_own) < FRIENDLY &&
279 roll(100) > pln_identchance(pp, shp_hardtarget(targ),
281 if (roll(100) > pln_identchance(pp, shp_hardtarget(targ),
283 pr("sub #%d %s\n", targ->shp_uid,
284 xyas(targ->shp_x, targ->shp_y, player->cnum));
286 pr("%s %s\n", prship(targ),
287 xyas(targ->shp_x, targ->shp_y, player->cnum));
289 pr("%s %s @ %s\n", cname(targ->shp_own), prship(targ),
290 xyas(targ->shp_x, targ->shp_y, player->cnum));
298 * line_of_sight() - is there a "straight" all water path from (x,y) to (tx,ty)
299 * Ken & Irina Stevens, 1995
302 #define DOT(ax,ay,bx,by) ((ax)*(bx) + (ay)*(by))
303 #define LEN(x,y) ((x)*(x) + (y)*(y))
304 #define DIST(ax,ay,bx,by) LEN(bx - ax, by -ay)
307 line_of_sight(char **rad, int ax, int ay, int bx, int by)
309 int dxn = XNORM(bx - ax);
310 int dyn = YNORM(by - ay);
311 int dx = dxn > WORLD_X / 2 ? dxn - WORLD_X : dxn;
312 int dy = dyn > WORLD_Y / 2 ? dyn - WORLD_Y : dyn;
313 int dlen = LEN(dx, dy);
317 int tx, ty; /* test point */
318 double cd_dist = dlen; /* closest distance from c to vector d */
319 double md_dist; /* minimum distance from t to vector d */
320 double td_dist; /* distance from t to vector d */
321 double td_proj; /* the projection of t onto vector d */
322 int closest; /* index of closest */
324 struct sctstr *sectp;
329 md_dist = 100; /* will always be <= 2 */
331 for (n = 1; n <= 6; ++n) { /* Directions */
332 tx = cx + diroff[n][0];
333 ty = cy + diroff[n][1];
334 if (DIST(tx, ty, dx, dy) >= cd_dist)
336 td_proj = (double)DOT(tx, ty, dx, dy) / dlen;
337 td_dist = DIST(tx, ty, td_proj * dx, td_proj * dy);
338 if (td_dist < md_dist) {
343 if (CANT_HAPPEN(closest < 0))
345 cx = cx + diroff[closest][0];
346 cy = cy + diroff[closest][1];
348 blocked = (rad[YNORM(ay + cy)][XNORM(ax + cx)]
349 != dchr[SCT_WATER].d_mnem);
351 sectp = getsectp((ax + cx), (ay + cy));
353 if (sectp->sct_type == SCT_WATER ||
354 sectp->sct_type == SCT_BSPAN) {
361 cd_dist = DIST(cx, cy, dx, dy);