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 * torp.c: Fire torpedoes at enemy ships
30 * Known contributors to this file:
32 * Thomas Ruschak, 1992
35 * Markus Armbruster, 2004-2009
46 static void anti_torp(int f, int ntorping, int vshipown);
47 static void fire_dchrg(struct shpstr *, struct shpstr *, int);
48 static int fire_torp(struct shpstr *, struct shpstr *, int);
63 struct nstr_item nbst;
68 if (!snxtitem(&nbst, EF_SHIP, player->argp[1], "From ship(s)? "))
70 while (nxtitem(&nbst, &sub)) {
71 if (sub.shp_own != player->cnum)
73 if ((mchr[(int)sub.shp_type].m_flags & M_TORP) == 0)
75 if (sub.shp_item[I_GUN] == 0
76 || sub.shp_item[I_SHELL] < SHP_TORP_SHELLS)
78 if (sub.shp_item[I_MILIT] < 1)
80 if (sub.shp_effic < 60)
82 if (sub.shp_mobil <= 0)
86 pr("%d ships are eligible to torp\n", ntorping);
87 snxtitem_rewind(&nbst);
88 while (nxtitem(&nbst, &sub)) {
91 if (sub.shp_own != player->cnum) {
94 if ((mchr[(int)sub.shp_type].m_flags & M_TORP) == 0) {
95 pr("Ship # %d: A %s can't fire torpedoes!\n",
96 sub.shp_uid, mchr[(int)sub.shp_type].m_name);
99 if (sub.shp_item[I_GUN] == 0
100 || sub.shp_item[I_SHELL] < SHP_TORP_SHELLS) {
101 pr("Ship #%d has insufficient armament\n", sub.shp_uid);
104 if (sub.shp_item[I_MILIT] < 1) {
105 pr("Ship #%d has insufficient crew\n", sub.shp_uid);
108 if (sub.shp_effic < 60) {
109 pr("Ship #%d torpedo tubes inoperative.\n", sub.shp_uid);
112 if (sub.shp_mobil <= 0) {
113 pr("Ship #%d has insufficient mobility\n", sub.shp_uid);
117 sprintf(prompt, "Ship %d, target? ", sub.shp_uid);
118 if (!(ptr = getstarg(player->argp[2], prompt, buf)))
120 if (!check_ship_ok(&sub))
122 if ((victno = atoi(ptr)) < 0)
124 if (!getship(victno, &vship))
128 vshipown = vship.shp_own;
129 if (victno == subno) {
130 pr("Shooting yourself, eh? How strange...\n");
133 if (mchr[(int)vship.shp_type].m_flags & M_SUB) {
134 if (!(mchr[(int)sub.shp_type].m_flags & M_SUBT)) {
135 pr("You can't torpedo a submarine!\n");
139 dam = shp_torp(&sub, 1);
141 putship(sub.shp_uid, &sub);
142 if (CANT_HAPPEN(dam < 0)) {
143 pr("Ship #%d has insufficient armament\n", sub.shp_uid);
147 if ((mchr[(int)sub.shp_type].m_flags & M_SUB) == 0)
148 anti_torp(sub.shp_uid, ntorping, vshipown);
149 getship(sub.shp_uid, &sub);
150 if (sub.shp_own == 0)
153 erange = roundrange(torprange(&sub));
154 pr("Effective torpedo range is %d.0\n", erange);
156 getship(victno, &vship);
157 vshipown = vship.shp_own;
158 range = mapdist(sub.shp_x, sub.shp_y, vship.shp_x, vship.shp_y);
159 hitchance = shp_torp_hitchance(&sub, range);
160 if (range <= erange) {
161 pr("Hitchance = %d%%\n", (int)(hitchance * 100));
163 /* Now, can the torpedo even get there? */
164 if (!line_of_sight(NULL, sub.shp_x, sub.shp_y,
165 vship.shp_x, vship.shp_y)) {
166 pr("BOOM!... Torpedo slams into land before reaching target.\n");
167 /* We only tell the victim if we were within range. */
168 if (range <= erange) {
170 wu(0, vshipown, "Torpedo sighted @ %s by %s\n",
171 xyas(sub.shp_x, sub.shp_y, vshipown),
174 } else if (range > erange) {
175 pr("Out of range\n");
176 } else if (chance(hitchance)) {
179 wu(0, vshipown, "%s in %s torpedoed %s for %d damage.\n",
180 prsub(&sub), xyas(sub.shp_x, sub.shp_y, vshipown),
181 prship(&vship), dam);
182 if (vship.shp_rflags & RET_TORPED) {
183 retreat_ship(&vship, 't');
184 shipdamage(&vship, dam);
186 shipdamage(&vship, dam);
187 pr("Torpedo hit %s for %d damage.\n", prship(&vship), dam);
189 if (vship.shp_effic < SHIP_MINEFF)
190 pr("%s sunk!\n", prship(&vship));
191 putship(vship.shp_uid, &vship);
192 if (mchr[(int)sub.shp_type].m_flags & M_SUB)
193 nreport(vshipown, N_TORP_SHIP, 0, 1);
195 nreport(vshipown, N_SHIP_TORP, player->cnum, 1);
199 wu(0, vshipown, "Torpedo sighted @ %s by %s\n",
200 xyas(sub.shp_x, sub.shp_y, vshipown), prship(&vship));
203 if (mchr[(int)sub.shp_type].m_flags & M_SUB)
204 anti_torp(sub.shp_uid, ntorping, vshipown);
210 anti_torp(int f, int ntorping, int vshipown)
218 if (sub.shp_own == vshipown)
221 if ((mchr[(int)sub.shp_type].m_flags & M_SUB) == 0)
222 pr("Starting our attack run...\n");
225 while (getship(x++, &dd) && sub.shp_effic >= SHIP_MINEFF) {
228 if (dd.shp_own != vshipown)
231 if (!fire_torp(&dd, &sub, ntorping))
232 fire_dchrg(&dd, &sub, ntorping);
237 fire_dchrg(struct shpstr *sp, struct shpstr *targ, int ntargets)
239 int range, erange, dam;
241 erange = roundrange(shp_fire_range(sp));
242 range = mapdist(sp->shp_x, sp->shp_y, targ->shp_x, targ->shp_y);
246 if ((mchr[(int)targ->shp_type].m_flags & M_SUB) == 0) {
247 /* Return fire to a torpedo boat */
248 if (mchr[sp->shp_type].m_flags & M_SUB)
249 return; /* sub deck gun can't return fire */
251 putship(sp->shp_uid, sp);
258 pr("Kaboom!!! Incoming shells!\n");
259 if (sp->shp_own != 0)
261 "%s fired at %s\n", prship(sp), prship(targ));
263 pr("BLAM! %d damage!\n", dam);
265 /* Return fire to a submarine */
267 putship(sp->shp_uid, sp);
273 pr("\nCAPTAIN! !!Depth charges!!...\n");
274 if (sp->shp_own != 0)
276 "%s depth charged %s\n", prship(sp), prsub(targ));
277 pr("click...WHAM! %d damage!\n", dam);
279 shipdamage(targ, dam);
280 putship(targ->shp_uid, targ);
284 fire_torp(struct shpstr *sp, struct shpstr *targ, int ntargets)
286 int range, erange, dam;
288 if ((mchr[targ->shp_type].m_flags & M_SUB)
289 && (mchr[sp->shp_type].m_flags & M_SUBT) == 0)
290 return 0; /* need sub-torp to torpedo a sub */
292 erange = roundrange(torprange(sp));
293 range = mapdist(sp->shp_x, sp->shp_y, targ->shp_x, targ->shp_y);
297 if (!line_of_sight(NULL, sp->shp_x, sp->shp_y,
298 targ->shp_x, targ->shp_y))
300 dam = shp_torp(sp, 1);
301 putship(sp->shp_uid, sp);
305 pr("Captain! Torpedoes sighted!\n");
307 if (chance(shp_torp_hitchance(sp, range))) {
309 if (sp->shp_own != 0)
310 wu(0, sp->shp_own, "%s @ %s torpedoed %s\n",
312 xyas(sp->shp_x, sp->shp_y, sp->shp_own), prsub(targ));
316 shipdamage(targ, dam);
317 putship(targ->shp_uid, targ);
319 if (mchr[(int)sp->shp_type].m_flags & M_SUB)
320 nreport(targ->shp_own, N_TORP_SHIP, 0, 1);
322 nreport(targ->shp_own, N_SHIP_TORP, sp->shp_own, 1);
325 if (sp->shp_own != 0)
327 "%s missed %s with a torp at %s\n",
328 prship(sp), prsub(targ),
329 xyas(sp->shp_x, sp->shp_y, sp->shp_own));
336 prsub(struct shpstr *sp)
338 if (mchr[(int)sp->shp_type].m_flags & M_SUB)