2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2015, 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, 2004-2014
43 static int infect_people(struct natstr *, struct sctstr *);
46 do_plague(struct sctstr *sp, struct natstr *np, int etu)
51 if (opt_NO_PLAGUE) /* no plague nothing to do */
54 pstage = sp->sct_pstage;
55 ptime = sp->sct_ptime;
57 if (pstage == PLG_HEALTHY) {
58 pstage = infect_people(np, sp);
61 n = plague_people(np, sp->sct_item, &pstage, &ptime, etu);
64 wu(0, sp->sct_own, "PLAGUE deaths reported in %s.\n",
66 nreport(sp->sct_own, N_DIE_PLAGUE, 0, 1);
69 wu(0, sp->sct_own, "%s battling PLAGUE\n", ownxy(sp));
72 /* Are we still incubating? */
74 /* Yes. Will it turn "infectious" next time? */
76 /* Yes. Report an outbreak. */
78 "Outbreak of PLAGUE in %s!\n", ownxy(sp));
79 nreport(sp->sct_own, N_OUT_PLAGUE, 0, 1);
82 /* It has already moved on to "infectious" */
83 wu(0, sp->sct_own, "%s battling PLAGUE\n", ownxy(sp));
87 /* Has the plague moved to "incubation" yet? */
89 /* Yes. Will it turn "infectious" next time? */
91 /* Yes. Report an outbreak. */
93 "Outbreak of PLAGUE in %s!\n", ownxy(sp));
94 nreport(sp->sct_own, N_OUT_PLAGUE, 0, 1);
102 if (sp->sct_item[I_CIVIL] == 0 && sp->sct_item[I_MILIT] == 0
103 && !has_units(sp->sct_x, sp->sct_y, sp->sct_own)) {
104 makelost(EF_SECTOR, sp->sct_own, 0, sp->sct_x, sp->sct_y);
108 sp->sct_pstage = pstage;
109 sp->sct_ptime = ptime;
114 infect_people(struct natstr *np, struct sctstr *sp)
116 double pop, pop_space, bad_stuff, pollution, cleanup;
119 if (opt_NO_PLAGUE) /* no plague nothing to do */
122 if (np->nat_level[NAT_TLEV] <= 10.0)
126 * make plague where there was none before...
128 pop = sp->sct_item[I_CIVIL] + sp->sct_item[I_MILIT] + sp->sct_item[I_UW];
129 pop_space = max_pop(np->nat_level[NAT_RLEV], sp);
131 = sp->sct_item[I_IRON] + sp->sct_item[I_OIL] + sp->sct_item[I_RAD] * 2;
132 pollution = bad_stuff / 10.0 + np->nat_level[NAT_TLEV] + 100.0;
133 cleanup = sp->sct_effic + sp->sct_mobil + 100 + np->nat_level[NAT_RLEV];
134 plg_chance = ((pop / pop_space) * (pollution / cleanup) - 1.0) * 0.01;
135 if (chance(plg_chance))
141 * Given the fact that plague exists, kill off
142 * people if in plague state DYING. Increment
143 * the plague time. Return "current" plague
144 * stage. No reports generated here anymore.
147 plague_people(struct natstr *np, short *vec,
148 int *pstage, int *ptime, int etus)
155 if (opt_NO_PLAGUE) /* no plague nothing to do */
161 plg_num = 100.0 * etus;
162 plg_denom = (np->nat_level[NAT_RLEV] + 100.0) *
163 (*ptime + etus + 1.0);
164 pct_left = 1.0 - plg_num / plg_denom;
167 vec[I_CIVIL] = vec[I_CIVIL] * pct_left;
168 vec[I_MILIT] = vec[I_MILIT] * pct_left;
169 vec[I_UW] = vec[I_UW] * pct_left;
179 logerror("plague_people: bad pstage %d", stage);
180 *pstage = PLG_HEALTHY;
186 *ptime = etus / 2 + roll0(etus);