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 * 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.
46 #include "prototypes.h"
52 static int sb(natid, natid, struct sctstr *, coord, coord, int, int);
55 * See if any nearby ships will open up on the attacker
56 * Return damage done to attacker, if any.
57 * Subtracts shells used for firing. Responding ships
58 * require military, shells, and guns.
61 shipdef(natid att, natid own, coord x, coord y)
63 return sd(att, own, x, y, NOISY, 1, 1);
67 sd(natid att, natid own, coord x, coord y, int noisy, int defending,
81 snxtitem_dist(&ni, EF_SHIP, x, y, 8);
82 while (nxtitem(&ni, &ship) && eff > 0.30) {
83 if (!feels_like_helping(ship.shp_own, own, att))
86 if ((mchr[(int)ship.shp_type].m_flags & M_SUB) && !usesubs)
88 range = roundrange(shp_fire_range(&ship));
89 if (range < ni.curdist)
91 dam = shp_fire(&ship);
92 putship(ship.shp_uid, &ship);
96 nreport(ship.shp_own, N_FIRE_BACK, att, 1);
98 nreport(ship.shp_own, N_FIRE_S_ATTACK, att, 1);
99 eff *= (1.0 - (0.01 * dam));
102 pr("Incoming shells do %d damage!\n", dam);
104 if (noisy || (ship.shp_own != own)) {
105 if (ship.shp_own == own)
106 wu(0, own, "%s fired on %s at %s doing %d damage.\n",
107 prship(&ship), cname(att), xyas(x, y, own), dam);
111 "%s fired on %s at %s in defense of %s, doing %d damage.\n",
112 prship(&ship), cname(att), xyas(x, y, ship.shp_own),
116 "%s supported %s attacks against %s at %s, doing %d damage.\n",
117 prship(&ship), cname(own), cname(att),
118 xyas(x, y, ship.shp_own), dam);
122 return (int)(100 - eff * 100);
126 dd(natid att, natid def_own, coord ax, coord ay, int noisy, int defending)
129 struct sctstr firing;
132 if (opt_NO_FORT_FIRE) /* Forts can't fire! */
139 snxtsct_dist(&ns, ax, ay, 8);
140 while (nxtsct(&ns, &firing) && dam < 80) {
141 if (!feels_like_helping(firing.sct_own, def_own, att))
143 /* XXX defdef damage is additive, but ship or land unit damage isn't */
144 dam += sb(att, def_own, &firing, ax, ay, noisy, defending);
150 * Shall CN attempt to help FRIEND against FOE?
153 feels_like_helping(natid cn, natid friend, natid foe)
156 return 0; /* never helps anybody */
158 return 0; /* don't help anybody against self */
160 return 1; /* help self against anybody else */
161 /* third party helps ally if at war with foe: */
162 return getrel(getnatp(cn), friend) == ALLIED
163 && getrel(getnatp(cn), foe) == AT_WAR;
168 * See if the sector being fired at will defend itself.
171 sb(natid att, natid def, struct sctstr *sp, coord tx, coord ty, int noisy,
183 range = roundrange(fortrange(sp));
184 range2 = mapdist(sp->sct_x, sp->sct_y, tx, ty);
187 damage = fort_fire(sp);
191 if (sp->sct_own != def)
193 "%s fired on %s in %s in defense of %s, doing %d damage!\n",
194 xyas(sp->sct_x, sp->sct_y, sp->sct_own), cname(att),
195 xyas(tx, ty, sp->sct_own), cname(def), damage);
197 nreport(sp->sct_own, N_FIRE_BACK, att, 1);
199 nreport(sp->sct_own, N_FIRE_F_ATTACK, att, 1);
201 pr("Incoming shell! %d damage done.\007\n", damage);