2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2017, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure, Markus Armbruster
6 * Empire 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 3 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, see <http://www.gnu.org/licenses/>.
21 * See files README, COPYING and CREDITS in the root of the source
22 * tree for related information and legal notices. It is expected
23 * that future projects/authors will amend these files as needed.
27 * plague.c: Plague related functions
29 * Known contributors to this file:
30 * Steve McClure, 1998-2000
31 * Markus Armbruster, 2004-2016
43 #include "prototypes.h"
47 static int infect_people(struct natstr *, struct sctstr *);
50 do_plague(struct sctstr *sp, int etu)
52 struct natstr *np = getnatp(sp->sct_own);
56 if (opt_NO_PLAGUE) /* no plague nothing to do */
59 pstage = sp->sct_pstage;
60 ptime = sp->sct_ptime;
62 if (pstage == PLG_HEALTHY) {
63 pstage = infect_people(np, sp);
66 n = plague_people(np, sp->sct_item, &pstage, &ptime, etu);
68 plague_report(sp->sct_own, n, pstage, ptime, etu,
72 sp->sct_pstage = pstage;
73 sp->sct_ptime = ptime;
78 infect_people(struct natstr *np, struct sctstr *sp)
80 double pop, pop_space, bad_stuff, pollution, cleanup;
83 if (opt_NO_PLAGUE) /* no plague nothing to do */
86 if (np->nat_level[NAT_TLEV] <= 10.0)
90 * make plague where there was none before...
92 pop = sp->sct_item[I_CIVIL] + sp->sct_item[I_MILIT] + sp->sct_item[I_UW];
93 pop_space = max_pop(np->nat_level[NAT_RLEV], sp);
95 = sp->sct_item[I_IRON] + sp->sct_item[I_OIL] + sp->sct_item[I_RAD] * 2;
96 pollution = bad_stuff / 10.0 + np->nat_level[NAT_TLEV] + 100.0;
97 cleanup = sp->sct_effic + sp->sct_mobil + 100 + np->nat_level[NAT_RLEV];
98 plg_chance = ((pop / pop_space) * (pollution / cleanup) - 1.0) * 0.01;
99 if (chance(plg_chance))
105 * Given the fact that plague exists, kill off
106 * people if in plague state DYING. Increment
107 * the plague time. Return "current" plague
108 * stage. No reports generated here anymore.
111 plague_people(struct natstr *np, short *vec,
112 int *pstage, int *ptime, int etus)
119 if (opt_NO_PLAGUE) /* no plague nothing to do */
125 plg_num = 100.0 * etus;
126 plg_denom = (np->nat_level[NAT_RLEV] + 100.0) *
127 (*ptime + etus + 1.0);
128 pct_left = 1.0 - plg_num / plg_denom;
131 vec[I_CIVIL] = vec[I_CIVIL] * pct_left;
132 vec[I_MILIT] = vec[I_MILIT] * pct_left;
133 vec[I_UW] = vec[I_UW] * pct_left;
143 logerror("plague_people: bad pstage %d", stage);
144 *pstage = PLG_HEALTHY;
150 *ptime = etus / 2 + roll0(etus);
156 plague_report(natid victim, int new_pstage, int pstage, int ptime,
157 int etus, char *in_on, char *place)
159 switch (new_pstage) {
161 wu(0, victim, "PLAGUE deaths reported %s %s\n", in_on, place);
162 nreport(victim, N_DIE_PLAGUE, 0, 1);
165 wu(0, victim, "%s battling PLAGUE\n", place);
168 /* Are we still incubating? */
169 if (new_pstage == pstage) {
170 /* Yes. Will it turn "infectious" next time? */
172 /* Yes. Report an outbreak. */
174 "Outbreak of PLAGUE %s %s!\n", in_on, place);
175 nreport(victim, N_OUT_PLAGUE, 0, 1);
178 /* It has already moved on to "infectious" */
179 wu(0, victim, "%s battling PLAGUE\n", place);
183 /* Has the plague moved to "incubation" yet? */
184 if (new_pstage != pstage) {
185 /* Yes. Will it turn "infectious" next time? */
187 /* Yes. Report an outbreak. */
189 "Outbreak of PLAGUE %s %s!\n", in_on, place);
190 nreport(victim, N_OUT_PLAGUE, 0, 1);