/*
* Empire - A multi-player, client/server Internet based war game.
- * Copyright (C) 1986-2000, Dave Pare, Jeff Bailey, Thomas Ruschak,
+ * Copyright (C) 1986-2009, Dave Pare, Jeff Bailey, Thomas Ruschak,
* Ken Stevens, Steve McClure
*
* This program is free software; you can redistribute it and/or modify
*
* ---
*
- * See the "LEGAL", "LICENSE", "CREDITS" and "README" files for all the
- * related information and legal notices. It is expected that any future
- * projects/authors will amend these files as needed.
+ * See files README, COPYING and CREDITS in the root of the source
+ * tree for related information and legal notices. It is expected
+ * that future projects/authors will amend these files as needed.
*
* ---
*
- * landgun.c: Return values for land and ship gun firing damages
- *
+ * landgun.c: Fire weapons
+ *
* Known contributors to this file:
- *
+ * Markus Armbruster, 2006-2009
*/
-#include "misc.h"
-#include "ship.h"
+#include <config.h>
+
+#include "damage.h"
+#include "file.h"
#include "land.h"
-#include "sect.h"
+#include "nat.h"
+#include "optlist.h"
#include "prototypes.h"
+#include "sect.h"
+#include "ship.h"
double
-landgun(int effic, int guns)
+fortgun(int effic, int guns)
{
- double d;
- double g = (double)min(guns,7);
+ double d;
+ double g = MIN(guns, 7);
- d = ((double)(random() % 30) + 20.0) * ((double)g / 7.0);
- d *= ((double)effic);
- d /= 100.0;
- return d;
+ d = (random() % 30 + 20.0) * (g / 7.0);
+ d *= effic / 100.0;
+ return d;
}
double
seagun(int effic, int guns)
{
- double d;
+ double d;
- d = 0.0;
- while (guns--)
- d += 10.0 + (double)(random() % 6);
- d *= ((double)effic) * 0.01;
- return d;
+ d = 0.0;
+ while (guns--)
+ d += 10.0 + random() % 6;
+ d *= effic * 0.01;
+ return d;
}
double
-landunitgun(int effic, int shots, int guns, int ammo, int shells)
+landunitgun(int effic, int guns)
{
- double d = 0.0;
+ double d;
- shots = min(shots, guns);
- while (shots-- > 0)
- d += 5.0 + (double)(random() % 6);
- d *= ((double)effic) * 0.01;
- if (shells < ammo && ammo != 0)
- d *= (double)((double)shells / (double)ammo);
- return d;
+ d = 0.0;
+ while (guns--)
+ d += 5.0 + random() % 6;
+ d *= effic * 0.01;
+ return d;
}
+/*
+ * Fire from fortress SP.
+ * Use ammo, resupply if necessary.
+ * Return damage if the fortress fires, else -1.
+ */
int
-roundrange(double r)
+fort_fire(struct sctstr *sp)
+{
+ int guns = sp->sct_item[I_GUN];
+
+ if (sp->sct_type != SCT_FORTR || sp->sct_effic < FORTEFF)
+ return -1;
+ if (sp->sct_item[I_MILIT] < 5 || guns == 0)
+ return -1;
+ if (!sct_supply(sp, I_SHELL, 1))
+ return -1;
+ sp->sct_item[I_SHELL]--;
+ return (int)fortgun(sp->sct_effic, guns);
+}
+
+/*
+ * Fire from ship SP.
+ * Use ammo, resupply if necessary.
+ * Return damage if the ship fires, else -1.
+ */
+int
+shp_fire(struct shpstr *sp)
+{
+ int guns;
+
+ if (sp->shp_effic < 60)
+ return -1;
+ guns = shp_usable_guns(sp);
+ guns = MIN(guns, (sp->shp_item[I_MILIT] + 1) / 2);
+ if (guns == 0)
+ return -1;
+ shp_supply(sp, I_SHELL, (guns + 1) / 2);
+ guns = MIN(guns, sp->shp_item[I_SHELL] * 2);
+ if (guns == 0)
+ return -1;
+ sp->shp_item[I_SHELL] -= (guns + 1) / 2;
+ return (int)seagun(sp->shp_effic, guns);
+}
+
+/*
+ * Drop depth-charges from ship SP.
+ * Use ammo, resupply if necessary.
+ * Return damage if the ship drops depth-charges, else -1.
+ */
+int
+shp_dchrg(struct shpstr *sp)
+{
+ int dchrgs;
+
+ if (sp->shp_effic < 60 || (mchr[sp->shp_type].m_flags & M_DCH) == 0)
+ return -1;
+ if (sp->shp_item[I_MILIT] == 0)
+ return -1;
+ shp_supply(sp, I_SHELL, 2);
+ dchrgs = MIN(2, sp->shp_item[I_SHELL]);
+ if (dchrgs == 0)
+ return -1;
+ sp->shp_item[I_SHELL] -= dchrgs;
+ return (int)seagun(sp->shp_effic, 2 * dchrgs - 1);
+}
+
+/*
+ * Fire torpedo from ship SP.
+ * Use ammo and mobility, resupply if necessary.
+ * Return damage if the ship fires, else -1.
+ */
+int
+shp_torp(struct shpstr *sp, int usemob)
+{
+ if (sp->shp_effic < 60 || (mchr[sp->shp_type].m_flags & M_TORP) == 0)
+ return -1;
+ if (sp->shp_item[I_MILIT] == 0 || sp->shp_item[I_GUN] == 0)
+ return -1;
+ if (usemob && sp->shp_mobil <= 0)
+ return -1;
+ if (!shp_supply(sp, I_SHELL, SHP_TORP_SHELLS))
+ return -1;
+ sp->shp_item[I_SHELL] -= SHP_TORP_SHELLS;
+ if (usemob)
+ sp->shp_mobil -= (int)shp_mobcost(sp) / 2.0;
+ return TORP_DAMAGE();
+}
+
+/*
+ * Fire from land unit LP.
+ * Use ammo, resupply if necessary.
+ * Return damage if the land unit fires, else -1.
+ */
+int
+lnd_fire(struct lndstr *lp)
+{
+ int guns, ammo, shells;
+ double d;
+
+ if (lp->lnd_effic < LAND_MINFIREEFF)
+ return -1;
+ if (lp->lnd_ship >= 0 || lp->lnd_land >= 0)
+ return -1;
+ if (lp->lnd_item[I_MILIT] == 0)
+ return -1;
+ guns = lnd_dam(lp);
+ guns = MIN(guns, lp->lnd_item[I_GUN]);
+ if (guns == 0)
+ return -1;
+ ammo = lchr[lp->lnd_type].l_ammo;
+ if (CANT_HAPPEN(ammo == 0))
+ ammo = 1;
+ lnd_supply(lp, I_SHELL, ammo);
+ shells = lp->lnd_item[I_SHELL];
+ if (shells == 0)
+ return -1;
+ d = landunitgun(lp->lnd_effic, guns);
+ if (shells < ammo) {
+ d *= (double)shells / (double)ammo;
+ ammo = shells;
+ }
+ lp->lnd_item[I_SHELL] -= ammo;
+ return d;
+}
+
+/*
+ * Return number of guns ship SP can fire.
+ */
+int
+shp_usable_guns(struct shpstr *sp)
+{
+ return MIN(shp_glim(sp), sp->shp_item[I_GUN]);
+}
+
+/*
+ * Return effective firing range for range factor RNG at tech TLEV.
+ */
+static double
+effrange(int rng, double tlev)
+{
+ /* FIXME don't truncate TLEV */
+ return techfact((int)tlev, rng / 2.0);
+}
+
+/*
+ * Return firing range for sector SP.
+ */
+double
+fortrange(struct sctstr *sp)
+{
+ struct natstr *np = getnatp(sp->sct_own);
+ double rng;
+
+ if (sp->sct_type != SCT_FORTR || sp->sct_effic < FORTEFF)
+ return -1.0;
+
+ rng = effrange(14.0 * fire_range_factor, np->nat_level[NAT_TLEV]);
+ if (sp->sct_effic > 59)
+ rng++;
+ return rng;
+}
+
+/*
+ * Return firing range for ship SP.
+ */
+double
+shp_fire_range(struct shpstr *sp)
+{
+ return effrange(shp_frnge(sp), sp->shp_tech);
+}
+
+/*
+ * Return torpedo range for ship SP.
+ */
+double
+torprange(struct shpstr *sp)
{
- double f;
+ return effrange(shp_frnge(sp) * 2, sp->shp_tech)
+ * sp->shp_effic / 100.0;
+}
- f = r - ((int)r);
- if (chance(f))
- return (((int)r) + 1);
- else
- return ((int)r);
+/*
+ * Return hit chance for torpedo from ship SP at range RANGE.
+ */
+double
+shp_torp_hitchance(struct shpstr *sp, int range)
+{
+ return DTORP_HITCHANCE(range, shp_visib(sp));
+}
+
+/*
+ * Return firing range for land unit SP.
+ */
+double
+lnd_fire_range(struct lndstr *lp)
+{
+ return effrange(lnd_frg(lp), lp->lnd_tech);
+}
+
+int
+roundrange(double r)
+{
+ return roundavg(r);
}