2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2006, 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 * fortdef.c: Fort defends an area.
30 * Known contributors to this file:
35 * The base routines can also be used for general purposes.
36 * Noisy tells whther to send teles, print things, etc.
37 * Defending tells whether they are being defensive, or offensive.
52 #include "prototypes.h"
56 static int sb(natid, natid, struct sctstr *, coord, coord, int, int);
59 * See if any nearby ships will open up on the attacker
60 * Return damage done to attacker, if any.
61 * Subtracts shells used for firing. Responding ships
62 * require military, shells, and guns.
65 shipdef(natid att, natid own, coord x, coord y)
67 return sd(att, own, x, y, NOISY, 1, 1);
71 sd(natid att, natid own, coord x, coord y, int noisy, int defending,
87 snxtitem_dist(&ni, EF_SHIP, x, y, 8);
88 while (nxtitem(&ni, &ship) && eff > 0.30) {
89 if (ship.shp_own == att)
91 if (ship.shp_own == 0)
94 rel = getrel(getnatp(ship.shp_own), own);
95 rel2 = getrel(getnatp(ship.shp_own), att);
96 if ((ship.shp_own != own) && ((rel != ALLIED) || (rel2 != AT_WAR)))
98 if (ship.shp_effic < 60)
100 if ((mchr[(int)ship.shp_type].m_flags & M_SUB) && !usesubs)
102 range = roundrange(effrange(ship.shp_frnge, ship.shp_tech));
103 if (range < ni.curdist)
105 /* must have gun, shell, and milit to fire */
106 shell = ship.shp_item[I_SHELL];
107 if (shell < ship.shp_glim)
108 shell += supply_commod(ship.shp_own, ship.shp_x, ship.shp_y,
109 I_SHELL, shell - ship.shp_glim);
110 nshot = MIN(MIN(ship.shp_item[I_GUN], shell), ship.shp_item[I_MILIT]);
111 nshot = MIN(nshot, ship.shp_glim);
114 ship.shp_item[I_SHELL] = shell - nshot;
115 putship(ship.shp_uid, &ship);
117 nreport(ship.shp_own, N_FIRE_BACK, att, 1);
119 nreport(ship.shp_own, N_FIRE_S_ATTACK, att, 1);
120 dam = seagun(ship.shp_effic, nshot);
121 eff *= (1.0 - (0.01 * dam));
124 pr("Incoming shell%s %d damage!\n",
125 nshot == 1 ? " does" : "s do", dam);
127 if (noisy || (ship.shp_own != own)) {
128 if (ship.shp_own == own)
129 wu(0, own, "%s fired on %s at %s doing %d damage.\n",
130 prship(&ship), cname(att), xyas(x, y, own), dam);
134 "%s fired on %s at %s in defense of %s, doing %d damage.\n",
135 prship(&ship), cname(att), xyas(x, y, ship.shp_own),
139 "%s supported %s attacks against %s at %s, doing %d damage.\n",
140 prship(&ship), cname(own), cname(att),
141 xyas(x, y, ship.shp_own), dam);
145 return (int)(100 - eff * 100);
149 dd(natid att, natid def_own, coord ax, coord ay, int noisy, int defending)
152 struct sctstr firing;
155 if (opt_NO_FORT_FIRE) /* Forts can't fire! */
162 snxtsct_dist(&ns, ax, ay, 8);
163 while (nxtsct(&ns, &firing) && dam < 80) {
164 if (firing.sct_own == att)
166 if (firing.sct_own == 0)
168 rel = getrel(getnatp(firing.sct_own), def_own);
169 rel2 = getrel(getnatp(firing.sct_own), att);
170 if (firing.sct_own != def_own && (rel != ALLIED || rel2 != AT_WAR))
172 /* XXX defdef damage is additive, but ship or land unit damage isn't */
173 dam += sb(att, def_own, &firing, ax, ay, noisy, defending);
180 * See if the sector being fired at will defend itself.
183 sb(natid att, natid def, struct sctstr *sp, coord tx, coord ty, int noisy,
197 range = roundrange(fortrange(sp));
198 range2 = mapdist(sp->sct_x, sp->sct_y, tx, ty);
201 gun = sp->sct_item[I_GUN];
204 shell = sp->sct_item[I_SHELL];
206 shell += supply_commod(sp->sct_own, sp->sct_x, sp->sct_y,
210 sp->sct_item[I_SHELL] = shell - 1;
212 damage = landgun((int)sp->sct_effic, gun);
213 if (sp->sct_own != def)
215 "%s fired on %s in %s in defense of %s, doing %d damage!\n",
216 xyas(sp->sct_x, sp->sct_y, sp->sct_own), cname(att),
217 xyas(tx, ty, sp->sct_own), cname(def), damage);
219 nreport(sp->sct_own, N_FIRE_BACK, att, 1);
221 nreport(sp->sct_own, N_FIRE_F_ATTACK, att, 1);
223 pr("Incoming shell! %d damage done.\007\n", damage);