2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2020, 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
41 * Return BTUs produced by @cap in @etu ETUs.
44 accrued_btus(struct sctstr *cap, int etu)
48 switch (cap->sct_type) {
60 eff *= cap->sct_work / 100.0;
64 civ = cap->sct_item[I_CIVIL];
68 return roundavg(etu * civ * eff * btu_build_rate);
72 * Grant nation @np the BTUs produced by its capital in @etu ETUs.
73 * Return whether it has a capital.
76 grant_btus(struct natstr *np, int etu)
81 getsect(np->nat_xcap, np->nat_ycap, §);
82 has_cap = np->nat_stat >= STAT_ACTIVE && !influx(np);
85 delta = accrued_btus(§, etu);
86 if (delta + np->nat_btu > max_btus)
87 np->nat_btu = max_btus;
91 if (np->nat_stat == STAT_VIS || np->nat_stat == STAT_GOD)
92 np->nat_btu = max_btus;