Markus Armbruster
c53158eee0
Turns damage() into a one-liner. damage() now uses random() % 32768 in chance() instead of random() % 100 inline, therefore can round differently for the same pseudo-random number. Update expected smoke test results accordingly. Aside: "random() % n" distributes evenly only when n is a power of two. 100 isn't. However, because random() yields at least 31 bits, and 100 is so much smaller than 2^31, the error is vanishingly small.
191 lines
4.3 KiB
C
191 lines
4.3 KiB
C
/*
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* Empire - A multi-player, client/server Internet based war game.
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* Copyright (C) 1986-2013, Dave Pare, Jeff Bailey, Thomas Ruschak,
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* Ken Stevens, Steve McClure, Markus Armbruster
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*
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* Empire is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* ---
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*
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* See files README, COPYING and CREDITS in the root of the source
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* tree for related information and legal notices. It is expected
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* that future projects/authors will amend these files as needed.
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*
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* ---
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*
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* damage.c: Damage stuff.
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*
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* Known contributors to this file:
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* Dave Pare, 1989
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* Steve McClure, 1997
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* Markus Armbruster, 2004-2012
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*/
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#include <config.h>
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#include "chance.h"
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#include "damage.h"
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#include "land.h"
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#include "misc.h"
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#include "nsc.h"
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#include "nuke.h"
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#include "optlist.h"
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#include "plane.h"
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#include "prototypes.h"
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#include "ship.h"
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void
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item_damage(int pct, short *item)
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{
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int lose;
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i_type i;
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for (i = I_NONE + 1; i <= I_MAX; ++i) {
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if (opt_SUPER_BARS && i == I_BAR)
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continue;
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lose = roundavg((double)item[i] * pct * 0.01);
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if (i == I_CIVIL || i == I_MILIT || i == I_UW)
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lose = ldround(people_damage * lose, 1);
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item[i] = item[i] >= lose ? item[i] - lose : 0;
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}
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}
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void
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ship_damage(struct shpstr *sp, int dam)
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{
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if (dam <= 0)
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return;
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if (dam > 100)
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dam = 100;
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mpr(sp->shp_own, "\t%s takes %d\n", prship(sp), dam);
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sp->shp_effic = damage((int)sp->shp_effic, dam);
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if (sp->shp_mobil > 0)
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sp->shp_mobil = damage((int)sp->shp_mobil, dam);
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item_damage(dam, sp->shp_item);
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}
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void
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shipdamage(struct shpstr *sp, int dam)
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{
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ship_damage(sp, (int)(dam / (1.0 + shp_armor(sp) / 100.0)));
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}
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void
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land_damage(struct lndstr *lp, int dam)
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{
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if (dam <= 0)
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return;
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if (dam > 100)
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dam = 100;
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mpr(lp->lnd_own, "\t%s takes %d\n", prland(lp), dam);
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if (lchr[(int)lp->lnd_type].l_flags & L_SPY) {
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/* Spies die! */
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lp->lnd_effic = 0;
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} else {
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lp->lnd_effic = damage((int)lp->lnd_effic, dam);
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if (lp->lnd_mobil > 0)
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lp->lnd_mobil = damage((int)lp->lnd_mobil, dam);
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item_damage(dam, lp->lnd_item);
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}
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}
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void
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landdamage(struct lndstr *lp, int dam)
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{
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double damage_factor, m;
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m = land_mob_max;
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/* fortification reduces damage */
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damage_factor = m / (m + lp->lnd_harden);
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/* vulnerable units take more damage */
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damage_factor *= lnd_vul(lp) / 100.0;
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land_damage(lp, ldround(damage_factor * dam, 1));
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}
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void
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planedamage(struct plnstr *pp, int dam)
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{
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if (dam <= 0)
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return;
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if (dam > 100)
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dam = 100;
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mpr(pp->pln_own, "\t%s takes %d\n", prplane(pp), dam);
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pp->pln_effic = damage((int)pp->pln_effic, dam);
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if (pp->pln_mobil > 0)
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pp->pln_mobil = damage((int)pp->pln_mobil, dam);
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}
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/*
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* nukedamage() actually just calculates damage
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* rather than inflicting it.
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*/
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int
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nukedamage(struct nchrstr *ncp, int range, int airburst)
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{
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int dam;
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int rad;
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rad = ncp->n_blast;
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if (airburst)
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rad = (int)(rad * 1.5);
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if (rad < range)
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return 0;
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if (airburst) {
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/* larger area, less center damage */
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dam = (int)((ncp->n_dam * 0.75) - (range * 20));
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} else {
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/* smaller area, more center damage */
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dam = (int)(ncp->n_dam / (range + 1.0));
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}
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if (dam < 5)
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dam = 0;
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return dam;
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}
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int
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damage(int amt, int pct)
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{
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if (amt <= 0)
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return 0;
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return amt - roundavg(amt * (pct / 100.0));
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}
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/* asymptotic damage to commodities, efficiency, and sectors */
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int
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effdamage(int amt, int dam)
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{
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return damage(amt, PERCENT_DAMAGE(dam));
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}
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int
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commdamage(int amt, int dam, i_type vtype)
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{
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int lost;
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if (vtype == I_BAR && opt_SUPER_BARS)
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return amt;
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lost = amt - effdamage(amt, dam);
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if (vtype == I_MILIT || vtype == I_CIVIL || vtype == I_UW)
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lost = ldround(people_damage * lost, 1);
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return amt - lost;
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}
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