445 lines
12 KiB
C
445 lines
12 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2007, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* ---
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*
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* See files README, COPYING and CREDITS in the root of the source
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* tree for related information and legal notices. It is expected
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* that future projects/authors will amend these files as needed.
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*
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* ---
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*
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* torp.c: Fire torpedoes at enemy ships
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*
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* Known contributors to this file:
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* Dave Pare
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* Thomas Ruschak, 1992
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* Ken Stevens, 1995
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* Steve McClure, 2000
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*/
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#include <config.h>
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#include "commands.h"
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#include "damage.h"
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#include "news.h"
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#include "optlist.h"
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#include "retreat.h"
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#include "ship.h"
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static void anti_torp(int f, int ntorping, int vshipown);
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static int candchrg(struct shpstr *, struct shpstr *);
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static int canshoot(struct shpstr *, struct shpstr *);
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static int cantorp(struct shpstr *, struct shpstr *);
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static void fire_dchrg(struct shpstr *, struct shpstr *, int);
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static int fire_torp(struct shpstr *, struct shpstr *, int, int);
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int
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torp(void)
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{
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natid vshipown;
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int range;
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int dam;
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int shells;
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int subno;
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int victno;
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int erange;
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double hitchance;
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struct shpstr vship;
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struct shpstr sub;
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char *ptr;
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struct nstr_item nbst;
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char buf[1024];
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char *sav;
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int ntorping = 0;
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char prompt[128];
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if (!(sav = getstarg(player->argp[1], "From ship(s)? ", buf)))
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return RET_SYN;
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if (!snxtitem(&nbst, EF_SHIP, sav))
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return RET_SYN;
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while (nxtitem(&nbst, &sub)) {
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if (sub.shp_own != player->cnum)
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continue;
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if ((mchr[(int)sub.shp_type].m_flags & M_TORP) == 0)
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continue;
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shells = sub.shp_item[I_SHELL];
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if (shells < SHP_TORP_SHELLS)
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shells += supply_commod(sub.shp_own, sub.shp_x, sub.shp_y,
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I_SHELL, SHP_TORP_SHELLS - shells);
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if (sub.shp_item[I_GUN] == 0 || shells < SHP_TORP_SHELLS)
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continue;
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if (sub.shp_item[I_MILIT] < 1)
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continue;
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if (sub.shp_effic < 60)
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continue;
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if (sub.shp_mobil <= 0)
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continue;
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ntorping++;
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}
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pr("%d ships are eligible to torp\n", ntorping);
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snxtitem(&nbst, EF_SHIP, sav);
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while (nxtitem(&nbst, &sub)) {
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if (!sub.shp_own)
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continue;
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if (sub.shp_own != player->cnum) {
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continue;
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}
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if ((mchr[(int)sub.shp_type].m_flags & M_TORP) == 0) {
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pr("Ship # %d: A %s can't fire torpedoes!\n",
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sub.shp_uid, mchr[(int)sub.shp_type].m_name);
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continue;
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}
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shells = sub.shp_item[I_SHELL];
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if (shells < SHP_TORP_SHELLS)
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shells += supply_commod(sub.shp_own, sub.shp_x, sub.shp_y,
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I_SHELL, SHP_TORP_SHELLS - shells);
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if (sub.shp_item[I_GUN] == 0 || shells < SHP_TORP_SHELLS) {
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pr("Ship #%d has insufficient armament\n", sub.shp_uid);
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continue;
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}
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if (sub.shp_item[I_MILIT] < 1) {
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pr("Ship #%d has insufficient crew\n", sub.shp_uid);
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continue;
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}
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if (sub.shp_effic < 60) {
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pr("Ship #%d torpedo tubes inoperative.\n", sub.shp_uid);
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continue;
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}
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if (sub.shp_mobil <= 0) {
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pr("Ship #%d has insufficient mobility\n", sub.shp_uid);
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continue;
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}
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subno = sub.shp_uid;
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sprintf(prompt, "Ship %d, target? ", sub.shp_uid);
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if ((ptr = getstarg(player->argp[2], prompt, buf)) == 0)
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return RET_SYN;
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if (!check_ship_ok(&sub))
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return RET_FAIL;
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if ((victno = atoi(ptr)) < 0)
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return RET_SYN;
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if (!getship(victno, &vship))
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return RET_FAIL;
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if (!vship.shp_own)
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return RET_FAIL;
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vshipown = vship.shp_own;
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if (victno == subno) {
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pr("Shooting yourself, eh? How strange...\n");
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continue;
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}
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if (mchr[(int)vship.shp_type].m_flags & M_SUB) {
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if (!(mchr[(int)sub.shp_type].m_flags & M_SUBT)) {
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pr("You can't torpedo a submarine!\n");
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continue;
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}
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}
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if ((mchr[(int)sub.shp_type].m_flags & M_SUB) == 0)
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anti_torp(sub.shp_uid, ntorping, vshipown);
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getship(sub.shp_uid, &sub);
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if (sub.shp_own == 0) {
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continue;
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}
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erange = roundrange(torprange(&sub));
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pr("Effective torpedo range is %d.0\n", erange);
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shells -= SHP_TORP_SHELLS;
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sub.shp_item[I_SHELL] = shells;
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putship(sub.shp_uid, &sub);
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/* Mob cost for a torp is equal to the cost of 1/2 sector of movement */
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sub.shp_mobil -= shp_mobcost(&sub) / 2.0;
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pr("Whooosh... ");
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getship(victno, &vship);
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vshipown = vship.shp_own;
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range = mapdist(sub.shp_x, sub.shp_y, vship.shp_x, vship.shp_y);
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hitchance = DTORP_HITCHANCE(range, sub.shp_visib);
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if (range <= erange) {
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pr("Hitchance = %d%%\n", (int)(hitchance * 100));
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}
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/* Now, can the torpedo even get there? */
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if (!line_of_sight(NULL, sub.shp_x, sub.shp_y,
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vship.shp_x, vship.shp_y)) {
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pr("BOOM!... Torpedo slams into land before reaching target.\n");
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/* We only tell the victim if we were within range. */
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if (range <= erange) {
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if (vshipown != 0)
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wu(0, vshipown, "Torpedo sighted @ %s by %s\n",
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xyas(sub.shp_x, sub.shp_y, vshipown),
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prship(&vship));
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}
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} else if (range > erange) {
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pr("Out of range\n");
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} else if (hitchance >= 1.0 || chance(hitchance)) {
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pr("BOOM!...\n");
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dam = TORP_DAMAGE();
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if (vshipown != 0)
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wu(0, vshipown, "%s in %s torpedoed %s for %d damage.\n",
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prsub(&sub), xyas(sub.shp_x, sub.shp_y, vshipown),
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prship(&vship), dam);
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if (vship.shp_rflags & RET_TORPED) {
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retreat_ship(&vship, 't');
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shipdamage(&vship, dam);
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} else
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shipdamage(&vship, dam);
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pr("Torpedo hit %s for %d damage.\n", prship(&vship), dam);
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if (vship.shp_effic < SHIP_MINEFF)
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pr("%s sunk!\n", prship(&vship));
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putship(vship.shp_uid, &vship);
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if (mchr[(int)sub.shp_type].m_flags & M_SUB)
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nreport(vshipown, N_TORP_SHIP, 0, 1);
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else
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nreport(vshipown, N_SHIP_TORP, player->cnum, 1);
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} else {
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pr("Missed\n");
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if (vshipown != 0)
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wu(0, vshipown, "Torpedo sighted @ %s by %s\n",
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xyas(sub.shp_x, sub.shp_y, vshipown), prship(&vship));
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}
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sub.shp_mission = 0;
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putship(sub.shp_uid, &sub);
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if (mchr[(int)sub.shp_type].m_flags & M_SUB)
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anti_torp(sub.shp_uid, ntorping, vshipown);
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}
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return RET_OK;
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}
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static void
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anti_torp(int f, int ntorping, int vshipown)
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{
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int range, erange;
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struct shpstr sub;
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struct shpstr dd;
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int x;
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getship(f, &sub);
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if (sub.shp_own == vshipown)
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return;
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if ((mchr[(int)sub.shp_type].m_flags & M_SUB) == 0)
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pr("Starting our attack run...\n");
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x = 0;
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while (getship(x++, &dd) && sub.shp_effic >= SHIP_MINEFF) {
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if (dd.shp_own == 0)
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continue;
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if (dd.shp_own != vshipown)
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continue;
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if (dd.shp_effic < 60)
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continue;
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if (!canshoot(&dd, &sub))
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continue;
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erange = roundrange(effrange(dd.shp_frnge, dd.shp_tech));
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range = mapdist(sub.shp_x, sub.shp_y, dd.shp_x, dd.shp_y);
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if (range > erange)
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continue;
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if (!line_of_sight(NULL, sub.shp_x, sub.shp_y, dd.shp_x, dd.shp_y))
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continue;
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if (cantorp(&dd, &sub)) {
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/* Try torping.. if we can, maybe we can fire */
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if (!fire_torp(&dd, &sub, range, ntorping))
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if (candchrg(&dd, &sub))
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fire_dchrg(&dd, &sub, ntorping);
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} else
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fire_dchrg(&dd, &sub, ntorping);
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}
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}
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/* Can ship A shoot at ship B? */
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static int
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canshoot(struct shpstr *a, struct shpstr *b)
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{
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/* Anyone can shoot a normal ship */
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if ((mchr[(int)b->shp_type].m_flags & M_SUB) == 0)
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return 1;
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/* You can depth-charge a sub */
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if (mchr[(int)a->shp_type].m_flags & M_DCH)
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return 1;
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/* If you have SUBT flag, you can torp a sub */
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if (mchr[(int)a->shp_type].m_flags & M_SUBT)
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return 1;
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return 0;
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}
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/* Can ship A torp ship B? */
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static int
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cantorp(struct shpstr *a, struct shpstr *b)
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{
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if ((mchr[(int)a->shp_type].m_flags & M_TORP) == 0)
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return 0;
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/* Anyone with TORP flag can torp a normal ship */
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if ((mchr[(int)b->shp_type].m_flags & M_SUB) == 0)
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return 1;
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/* Ship b is a sub, so we need to have the SUBT flag */
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if (mchr[(int)a->shp_type].m_flags & M_SUBT)
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return 1;
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return 0;
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}
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/* Can ship A depth-charge (or fire guns at) ship B? */
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static int
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candchrg(struct shpstr *a, struct shpstr *b)
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{
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if ((mchr[(int)b->shp_type].m_flags & M_SUB) == 0) {
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if ((mchr[(int)a->shp_type].m_flags & M_SUB) == 0)
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return 1;
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return 0;
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}
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if ((mchr[(int)a->shp_type].m_flags & M_DCH) == 0)
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return 0;
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return 1;
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}
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static void
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fire_dchrg(struct shpstr *sp, struct shpstr *targ, int ntargets)
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{
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int dam;
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int shells;
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int gun;
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double guneff;
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shells = sp->shp_item[I_SHELL];
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gun = sp->shp_item[I_GUN];
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gun = MIN(gun, sp->shp_glim);
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gun = MIN(gun, sp->shp_item[I_MILIT] / 2);
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shells += supply_commod(sp->shp_own, sp->shp_x, sp->shp_y,
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I_SHELL, (gun + 1) / 2 - shells);
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gun = MIN(gun, shells * 2);
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if (gun == 0)
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return;
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/* ok, all set.. now, we shoot */
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shells -= ldround(gun / 2.0, 1);
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sp->shp_item[I_SHELL] = shells;
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putship(sp->shp_uid, sp);
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guneff = seagun(sp->shp_effic, gun);
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dam = (int)guneff;
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if (ntargets > 2)
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dam /= ntargets / 2;
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if ((mchr[(int)targ->shp_type].m_flags & M_SUB) == 0) {
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pr_beep();
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pr("Kaboom!!! Incoming shells!\n");
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if (sp->shp_own != 0)
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wu(0, sp->shp_own,
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"%s fired at %s\n", prship(sp), prship(targ));
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pr_beep();
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pr("BLAM! %d damage!\n", dam);
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shipdamage(targ, dam);
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putship(targ->shp_uid, targ);
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} else {
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pr("\nCAPTAIN! !!Depth charges!!...\n");
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if (sp->shp_own != 0)
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wu(0, sp->shp_own,
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"%s depth charged %s\n", prship(sp), prsub(targ));
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pr("click...WHAM! %d damage!\n", dam);
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shipdamage(targ, dam);
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putship(targ->shp_uid, targ);
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}
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}
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static int
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fire_torp(struct shpstr *sp, struct shpstr *targ, int range, int ntargets)
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{
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int dam;
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int shells;
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double hitchance;
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shells = sp->shp_item[I_SHELL];
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if (shells < SHP_TORP_SHELLS)
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shells += supply_commod(sp->shp_own, sp->shp_x, sp->shp_y,
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I_SHELL, SHP_TORP_SHELLS - shells);
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if (sp->shp_item[I_GUN] == 0 || shells < SHP_TORP_SHELLS)
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return 0;
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if (sp->shp_item[I_MILIT] < 1)
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return 0;
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if (sp->shp_effic < 60)
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return 0;
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if (sp->shp_mobil <= 0)
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return 0;
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/* All set.. fire! */
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shells -= SHP_TORP_SHELLS;
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sp->shp_item[I_SHELL] = shells;
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putship(sp->shp_uid, sp);
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/* Mob cost for a torp is equal to the cost of 1/2 sector of movement */
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sp->shp_mobil -= shp_mobcost(sp) / 2.0;
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hitchance = DTORP_HITCHANCE(range, sp->shp_visib);
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pr("Captain! Torpedoes sighted!\n");
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if (chance(hitchance)) {
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pr("BOOM!...\n");
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if (sp->shp_own != 0)
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wu(0, sp->shp_own, "%s @ %s torpedoed %s\n",
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prship(sp),
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xyas(sp->shp_x, sp->shp_y, sp->shp_own), prsub(targ));
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dam = TORP_DAMAGE();
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if (ntargets > 2)
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dam /= ntargets / 2;
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shipdamage(targ, dam);
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putship(targ->shp_uid, targ);
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if (mchr[(int)sp->shp_type].m_flags & M_SUB)
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nreport(targ->shp_own, N_TORP_SHIP, 0, 1);
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else
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nreport(targ->shp_own, N_SHIP_TORP, player->cnum, 1);
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} else {
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pr("Missed!\n");
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if (sp->shp_own != 0)
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wu(0, sp->shp_own,
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"%s missed %s with a torp at %s\n",
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prship(sp), prsub(targ),
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xyas(sp->shp_x, sp->shp_y, sp->shp_own));
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}
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return 1;
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}
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char *
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prsub(struct shpstr *sp)
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{
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if (mchr[(int)sp->shp_type].m_flags & M_SUB)
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return "sub";
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else
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return prship(sp);
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}
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