2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2004, 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 the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
23 * related information and legal notices. It is expected that any future
24 * projects/authors will amend these files as needed.
28 * plague.c: Plague related functions
30 * Known contributors to this file:
31 * Steve McClure, 1998-2000
50 static int infect_people(struct natstr *, struct sctstr *);
53 do_plague(struct sctstr *sp, struct natstr *np, int etu)
55 u_short pstage, ptime;
58 if (opt_NO_PLAGUE) /* no plague nothing to do */
61 pstage = sp->sct_pstage;
62 ptime = sp->sct_ptime;
64 if (pstage == PLG_HEALTHY) {
65 pstage = infect_people(np, sp);
68 n = plague_people(np, sp->sct_item, &pstage, &ptime, etu);
71 wu(0, sp->sct_own, "PLAGUE deaths reported in %s.\n",
73 nreport(sp->sct_own, N_DIE_PLAGUE, 0, 1);
76 wu(0, sp->sct_own, "%s battling PLAGUE\n", ownxy(sp));
79 /* Are we still incubating? */
81 /* Yes. Will it turn "infectious" next time? */
83 /* Yes. Report an outbreak. */
85 "Outbreak of PLAGUE in %s!\n", ownxy(sp));
86 nreport(sp->sct_own, N_OUT_PLAGUE, 0, 1);
89 /* It has already moved on to "infectious" */
90 wu(0, sp->sct_own, "%s battling PLAGUE\n", ownxy(sp));
94 /* Has the plague moved to "incubation" yet? */
96 /* Yes. Will it turn "infectious" next time? */
98 /* Yes. Report an outbreak. */
100 "Outbreak of PLAGUE in %s!\n", ownxy(sp));
101 nreport(sp->sct_own, N_OUT_PLAGUE, 0, 1);
109 if (sp->sct_item[I_CIVIL] == 0 && sp->sct_item[I_MILIT] == 0
110 && !has_units(sp->sct_x, sp->sct_y, sp->sct_own, 0)) {
111 makelost(EF_SECTOR, sp->sct_own, 0, sp->sct_x, sp->sct_y);
115 sp->sct_pstage = pstage;
116 sp->sct_ptime = ptime;
121 infect_people(struct natstr *np, struct sctstr *sp)
123 double pop, pop_space, bad_stuff, pollution, cleanup;
126 if (opt_NO_PLAGUE) /* no plague nothing to do */
129 if (np->nat_level[NAT_TLEV] <= 10.0)
133 * make plague where there was none before...
135 pop = sp->sct_item[I_CIVIL] + sp->sct_item[I_MILIT] + sp->sct_item[I_UW];
136 pop_space = max_pop(np->nat_level[NAT_RLEV], sp);
138 = sp->sct_item[I_IRON] + sp->sct_item[I_OIL] + sp->sct_item[I_RAD] * 2;
139 pollution = bad_stuff / 10.0 + np->nat_level[NAT_TLEV] + 100.0;
140 cleanup = sp->sct_effic + sp->sct_mobil + 100 + np->nat_level[NAT_RLEV];
141 plg_chance = ((pop / pop_space) * (pollution / cleanup) - 1.0) * 0.01;
142 if (chance(plg_chance))
148 * Given the fact that plague exists, kill off
149 * people if in plague state DYING. Increment
150 * the plague time. Return "current" plague
151 * stage. No reports generated here anymore.
154 plague_people(struct natstr *np, short *vec,
155 u_short *pstage, u_short *ptime,
163 if (opt_NO_PLAGUE) /* no plague nothing to do */
169 plg_num = 100.0 * etus;
170 plg_denom = (np->nat_level[NAT_RLEV] + 100.0) *
171 (*ptime + etus + 1.0);
172 pct_left = 1.0 - (double)(plg_num / plg_denom);
175 vec[I_CIVIL] = vec[I_CIVIL] * pct_left;
176 vec[I_MILIT] = vec[I_MILIT] * pct_left;
177 vec[I_UW] = vec[I_UW] * pct_left;
187 logerror("plague_people: bad pstage %d", stage);
188 *pstage = PLG_HEALTHY;
194 *ptime = (etus / 2) + (random() % etus);