2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2008, 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 * landgun.c: Return values for land and ship gun firing damages
30 * Known contributors to this file:
31 * Markus Armbruster, 2006
39 #include "prototypes.h"
44 fortgun(int effic, int guns)
47 double g = MIN(guns, 7);
49 d = (random() % 30 + 20.0) * (g / 7.0);
55 seagun(int effic, int guns)
61 d += 10.0 + random() % 6;
67 landunitgun(int effic, int shots, int guns, int ammo, int shells)
71 shots = MIN(shots, guns);
73 d += 5.0 + random() % 6;
75 if (shells < ammo && ammo != 0)
76 d *= (double)shells / (double)ammo;
81 * Fire from fortress SP.
82 * Use ammo, resupply if necessary.
83 * Return damage if the fortress fires, else -1.
86 fort_fire(struct sctstr *sp)
88 int guns = sp->sct_item[I_GUN];
91 if (sp->sct_type != SCT_FORTR || sp->sct_effic < FORTEFF)
93 if (sp->sct_item[I_MILIT] < 5 || guns == 0)
95 shells = sp->sct_item[I_SHELL];
96 shells += supply_commod(sp->sct_own, sp->sct_x, sp->sct_y,
100 sp->sct_item[I_SHELL] = shells - 1;
101 return (int)fortgun(sp->sct_effic, guns);
105 * Drop depth-charges from ship SP.
106 * Use ammo, resupply if necessary.
107 * Return damage if the ship drops depth-charges, else -1.
110 shp_dchrg(struct shpstr *sp)
114 if (sp->shp_effic < 60 || (mchr[sp->shp_type].m_flags & M_DCH) == 0)
116 if (sp->shp_item[I_MILIT] == 0)
118 shells = sp->shp_item[I_SHELL];
119 shells += supply_commod(sp->shp_own, sp->shp_x, sp->shp_y,
120 I_SHELL, 2 - shells);
123 sp->shp_item[I_SHELL] = shells - 2;
124 return (int)seagun(sp->shp_effic, 3);
128 * Return effective firing range for range factor RNG at tech TLEV.
131 effrange(int rng, double tlev)
133 /* FIXME don't truncate TLEV */
134 return techfact((int)tlev, rng / 2.0);
138 * Return torpedo range for ship SP.
141 torprange(struct shpstr *sp)
143 return effrange(sp->shp_frnge * 2, sp->shp_tech)
144 * sp->shp_effic / 100.0;
148 * Return firing range for sector SP.
151 fortrange(struct sctstr *sp)
153 struct natstr *np = getnatp(sp->sct_own);
156 if (sp->sct_type != SCT_FORTR || sp->sct_effic < FORTEFF)
159 rng = effrange(14.0 * fire_range_factor, np->nat_level[NAT_TLEV]);
160 if (sp->sct_effic > 59)