2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2011, 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 * btu.c: Dealing with BTUs
29 * Known contributors to this file:
30 * Markus Armbruster, 2007
38 #include "prototypes.h"
42 * Return BTUs produced by CAP in ETU ETUs.
45 accrued_btus(struct sctstr *cap, int etu)
49 switch (cap->sct_type) {
61 eff *= cap->sct_work / 100.0;
65 civ = cap->sct_item[I_CIVIL];
69 return roundavg(etu * civ * eff * btu_build_rate);
73 * Grant nation NP the BTUs produced by its capital in ETU ETUs.
74 * Return whether it has a capital.
77 grant_btus(struct natstr *np, int etu)
82 getsect(np->nat_xcap, np->nat_ycap, §);
83 has_cap = np->nat_stat >= STAT_ACTIVE && !influx(np);
86 delta = accrued_btus(§, etu);
87 if (delta + np->nat_btu > max_btus)
88 np->nat_btu = max_btus;
92 if (np->nat_stat == STAT_VIS || np->nat_stat == STAT_GOD)
93 np->nat_btu = max_btus;