2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2018, 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
42 #include "prototypes.h"
46 static int infect_people(struct natstr *, struct sctstr *);
49 do_plague(struct sctstr *sp, int etu)
51 struct natstr *np = getnatp(sp->sct_own);
55 if (opt_NO_PLAGUE) /* no plague nothing to do */
58 pstage = sp->sct_pstage;
59 ptime = sp->sct_ptime;
61 if (pstage == PLG_HEALTHY) {
62 pstage = infect_people(np, sp);
65 n = plague_people(np, sp->sct_item, &pstage, &ptime, etu);
67 plague_report(sp->sct_own, n, pstage, ptime, etu,
71 sp->sct_pstage = pstage;
72 sp->sct_ptime = ptime;
77 infect_people(struct natstr *np, struct sctstr *sp)
79 double pop, pop_space, bad_stuff, pollution, cleanup;
82 if (opt_NO_PLAGUE) /* no plague nothing to do */
85 if (np->nat_level[NAT_TLEV] <= 10.0)
89 * make plague where there was none before...
91 pop = sp->sct_item[I_CIVIL] + sp->sct_item[I_MILIT] + sp->sct_item[I_UW];
92 pop_space = max_pop(np->nat_level[NAT_RLEV], sp);
94 = sp->sct_item[I_IRON] + sp->sct_item[I_OIL] + sp->sct_item[I_RAD] * 2;
95 pollution = bad_stuff / 10.0 + np->nat_level[NAT_TLEV] + 100.0;
96 cleanup = sp->sct_effic + sp->sct_mobil + 100 + np->nat_level[NAT_RLEV];
97 plg_chance = ((pop / pop_space) * (pollution / cleanup) - 1.0) * 0.01;
98 if (chance(plg_chance))
104 * Given the fact that plague exists, kill off
105 * people if in plague state PLG_DYING. Increment
106 * the plague time. Return "current" plague
107 * stage. No reports generated here anymore.
110 plague_people(struct natstr *np, short *vec,
111 int *pstage, int *ptime, int etus)
118 if (opt_NO_PLAGUE) /* no plague nothing to do */
124 plg_num = 100.0 * etus;
125 plg_denom = (np->nat_level[NAT_RLEV] + 100.0) *
126 (*ptime + etus + 1.0);
127 pct_left = 1.0 - plg_num / plg_denom;
130 vec[I_CIVIL] = vec[I_CIVIL] * pct_left;
131 vec[I_MILIT] = vec[I_MILIT] * pct_left;
132 vec[I_UW] = vec[I_UW] * pct_left;
142 logerror("plague_people: bad pstage %d", stage);
143 *pstage = PLG_HEALTHY;
149 *ptime = etus / 2 + roll0(etus);
155 plague_report(natid victim, int new_pstage, int pstage, int ptime,
156 int etus, char *in_on, char *place)
158 switch (new_pstage) {
160 wu(0, victim, "PLAGUE deaths reported %s %s\n", in_on, place);
161 nreport(victim, N_DIE_PLAGUE, 0, 1);
164 wu(0, victim, "%s battling PLAGUE\n", place);
167 /* Are we still incubating? */
168 if (new_pstage == pstage) {
169 /* Yes. Will it turn "infectious" next time? */
171 /* Yes. Report an outbreak. */
173 "Outbreak of PLAGUE %s %s!\n", in_on, place);
174 nreport(victim, N_OUT_PLAGUE, 0, 1);
177 /* It has already moved on to "infectious" */
178 wu(0, victim, "%s battling PLAGUE\n", place);
182 /* Has the plague moved to "incubation" yet? */
183 if (new_pstage != pstage) {
184 /* Yes. Will it turn "infectious" next time? */
186 /* Yes. Report an outbreak. */
188 "Outbreak of PLAGUE %s %s!\n", in_on, place);
189 nreport(victim, N_OUT_PLAGUE, 0, 1);