trek/attack.c

   1 /*      $NetBSD: attack.c,v 1.4 1997/10/12 21:24:26 christos Exp $      */
   2
   3 /*
   4  * Copyright (c) 1980, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #ifndef lint
  38 #if 0
  39 static char sccsid[] = "@(#)attack.c    8.1 (Berkeley) 5/31/93";
  40 #else
  41 __RCSID("$NetBSD: attack.c,v 1.4 1997/10/12 21:24:26 christos Exp $");
  42 #endif
  43 #endif /* not lint */
  44
  45 #include <stdio.h>
  46 #include <math.h>
  47 #include "trek.h"
  48
  49 /*
  50 **  Klingon Attack Routine
  51 **
  52 **      This routine performs the Klingon attack provided that
  53 **      (1) Something happened this move (i.e., not free), and
  54 **      (2) You are not cloaked.  Note that if you issue the
  55 **      cloak command, you are not considered cloaked until you
  56 **      expend some time.
  57 **
  58 **      Klingons are permitted to move both before and after the
  59 **      attack.  They will tend to move toward you before the
  60 **      attack and away from you after the attack.
  61 **
  62 **      Under certain conditions you can get a critical hit.  This
  63 **      sort of hit damages devices.  The probability that a given
  64 **      device is damaged depends on the device.  Well protected
  65 **      devices (such as the computer, which is in the core of the
  66 **      ship and has considerable redundancy) almost never get
  67 **      damaged, whereas devices which are exposed (such as the
  68 **      warp engines) or which are particularly delicate (such as
  69 **      the transporter) have a much higher probability of being
  70 **      damaged.
  71 **
  72 **      The actual amount of damage (i.e., how long it takes to fix
  73 **      it) depends on the amount of the hit and the "damfac[]"
  74 **      entry for the particular device.
  75 **
  76 **      Casualties can also occur.
  77 */
  78
  79 void
  80 attack(resting)
  81 int     resting;        /* set if attack while resting */
  82 {
  83         int             hit, i, l;
  84         int             maxhit, tothit, shldabsb;
  85         double          chgfac, propor, extradm;
  86         double          dustfac, tothe;
  87         int             cas;
  88         int             hitflag;
  89
  90         if (Move.free)
  91                 return;
  92         if (Etc.nkling <= 0 || Quad[Ship.quadx][Ship.quady].stars < 0)
  93                 return;
  94         if (Ship.cloaked && Ship.cloakgood)
  95                 return;
  96         /* move before attack */
  97         klmove(0);
  98         if (Ship.cond == DOCKED)
  99         {
 100                 if (!resting)
 101                         printf("Starbase shields protect the %s\n", Ship.shipname);
 102                 return;
 103         }
 104         /* setup shield effectiveness */
 105         chgfac = 1.0;
 106         if (Move.shldchg)
 107                 chgfac = 0.25 + 0.50 * franf();
 108         maxhit = tothit = 0;
 109         hitflag = 0;
 110
 111         /* let each Klingon do his damndest */
 112         for (i = 0; i < Etc.nkling; i++)
 113         {
 114                 /* if he's low on power he won't attack */
 115                 if (Etc.klingon[i].power < 20)
 116                         continue;
 117                 if (!hitflag)
 118                 {
 119                         printf("\nStardate %.2f: Klingon attack:\n",
 120                                 Now.date);
 121                         hitflag++;
 122                 }
 123                 /* complete the hit */
 124                 dustfac = 0.90 + 0.01 * franf();
 125                 tothe = Etc.klingon[i].avgdist;
 126                 hit = Etc.klingon[i].power * pow(dustfac, tothe) * Param.hitfac;
 127                 /* deplete his energy */
 128                 dustfac = Etc.klingon[i].power;
 129                 Etc.klingon[i].power = dustfac * Param.phasfac * (1.0 + (franf() - 0.5) * 0.2);
 130                 /* see how much of hit shields will absorb */
 131                 shldabsb = 0;
 132                 if (Ship.shldup || Move.shldchg)
 133                 {
 134                         propor = Ship.shield;
 135                         propor /= Param.shield;
 136                         shldabsb = propor * chgfac * hit;
 137                         if (shldabsb > Ship.shield)
 138                                 shldabsb = Ship.shield;
 139                         Ship.shield -= shldabsb;
 140                 }
 141                 /* actually do the hit */
 142                 printf("\aHIT: %d units", hit);
 143                 if (!damaged(SRSCAN))
 144                         printf(" from %d,%d", Etc.klingon[i].x, Etc.klingon[i].y);
 145                 cas = (shldabsb * 100) / hit;
 146                 hit -= shldabsb;
 147                 if (shldabsb > 0)
 148                         printf(", shields absorb %d%%, effective hit %d\n",
 149                                 cas, hit);
 150                 else
 151                         printf("\n");
 152                 tothit += hit;
 153                 if (hit > maxhit)
 154                         maxhit = hit;
 155                 Ship.energy -= hit;
 156                 /* see if damages occurred */
 157                 if (hit >= (15 - Game.skill) * (25 - ranf(12)))
 158                 {
 159                         printf("\aCRITICAL HIT!!!\a\n");
 160                         /* select a device from probability vector */
 161                         cas = ranf(1000);
 162                         for (l = 0; cas >= 0; l++)
 163                                 cas -= Param.damprob[l];
 164                         l -= 1;
 165                         /* compute amount of damage */
 166                         extradm = (hit * Param.damfac[l]) / (75 + ranf(25)) + 0.5;
 167                         /* damage the device */
 168                         damage(l, extradm);
 169                         if (damaged(SHIELD))
 170                         {
 171                                 if (Ship.shldup)
 172                                         printf("Sulu: Shields knocked down, captain.\n");
 173                                 Ship.shldup = 0;
 174                                 Move.shldchg = 0;
 175                         }
 176                 }
 177                 if (Ship.energy <= 0)
 178                         lose(L_DSTRYD);
 179         }
 180
 181         /* see what our casualities are like */
 182         if (maxhit >= 200 || tothit >= 500)
 183         {
 184                 cas = tothit * 0.015 * franf();
 185                 if (cas >= 2)
 186                 {
 187                         printf("McCoy: we suffered %d casualties in that attack.\n",
 188                                 cas);
 189                         Game.deaths += cas;
 190                         Ship.crew -= cas;
 191                 }
 192         }
 193
 194         /* allow Klingons to move after attacking */
 195         klmove(1);
 196
 197         return;
 198 }