games/trek/attack.c

   1 /*      $NetBSD: attack.c,v 1.8 2009/05/24 21:55:24 dholland 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. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)attack.c    8.1 (Berkeley) 5/31/93";
  36 #else
  37 __RCSID("$NetBSD: attack.c,v 1.8 2009/05/24 21:55:24 dholland Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <stdio.h>
  42 #include <math.h>
  43 #include "trek.h"
  44
  45 /*
  46 **  Klingon Attack Routine
  47 **
  48 **      This routine performs the Klingon attack provided that
  49 **      (1) Something happened this move (i.e., not free), and
  50 **      (2) You are not cloaked.  Note that if you issue the
  51 **      cloak command, you are not considered cloaked until you
  52 **      expend some time.
  53 **
  54 **      Klingons are permitted to move both before and after the
  55 **      attack.  They will tend to move toward you before the
  56 **      attack and away from you after the attack.
  57 **
  58 **      Under certain conditions you can get a critical hit.  This
  59 **      sort of hit damages devices.  The probability that a given
  60 **      device is damaged depends on the device.  Well protected
  61 **      devices (such as the computer, which is in the core of the
  62 **      ship and has considerable redundancy) almost never get
  63 **      damaged, whereas devices which are exposed (such as the
  64 **      warp engines) or which are particularly delicate (such as
  65 **      the transporter) have a much higher probability of being
  66 **      damaged.
  67 **
  68 **      The actual amount of damage (i.e., how long it takes to fix
  69 **      it) depends on the amount of the hit and the "damfac[]"
  70 **      entry for the particular device.
  71 **
  72 **      Casualties can also occur.
  73 **
  74 **  resting -- set if attack while resting
  75 */
  76
  77 void
  78 attack(int resting)
  79 {
  80         int             hit, i, l;
  81         int             maxhit, tothit, shldabsb;
  82         double          chgfac, propor, extradm;
  83         double          dustfac, tothe;
  84         int             cas;
  85         int             hitflag;
  86
  87         if (Move.free)
  88                 return;
  89         if (Etc.nkling <= 0 || Quad[Ship.quadx][Ship.quady].stars < 0)
  90                 return;
  91         if (Ship.cloaked && Ship.cloakgood)
  92                 return;
  93         /* move before attack */
  94         klmove(0);
  95         if (Ship.cond == DOCKED) {
  96                 if (!resting)
  97                         printf("Starbase shields protect the %s\n",
  98                                 Ship.shipname);
  99                 return;
 100         }
 101         /* setup shield effectiveness */
 102         chgfac = 1.0;
 103         if (Move.shldchg)
 104                 chgfac = 0.25 + 0.50 * franf();
 105         maxhit = tothit = 0;
 106         hitflag = 0;
 107
 108         /* let each Klingon do his damndest */
 109         for (i = 0; i < Etc.nkling; i++) {
 110                 /* if he's low on power he won't attack */
 111                 if (Etc.klingon[i].power < 20)
 112                         continue;
 113                 if (!hitflag) {
 114                         printf("\nStardate %.2f: Klingon attack:\n",
 115                                 Now.date);
 116                         hitflag++;
 117                 }
 118                 /* complete the hit */
 119                 dustfac = 0.90 + 0.01 * franf();
 120                 tothe = Etc.klingon[i].avgdist;
 121                 hit = Etc.klingon[i].power * pow(dustfac, tothe) * Param.hitfac;
 122                 /* deplete his energy */
 123                 dustfac = Etc.klingon[i].power;
 124                 Etc.klingon[i].power = dustfac * Param.phasfac *
 125                         (1.0 + (franf() - 0.5) * 0.2);
 126                 /* see how much of hit shields will absorb */
 127                 shldabsb = 0;
 128                 if (Ship.shldup || Move.shldchg) {
 129                         propor = Ship.shield;
 130                         propor /= Param.shield;
 131                         shldabsb = propor * chgfac * hit;
 132                         if (shldabsb > Ship.shield)
 133                                 shldabsb = Ship.shield;
 134                         Ship.shield -= shldabsb;
 135                 }
 136                 /* actually do the hit */
 137                 printf("\aHIT: %d units", hit);
 138                 if (!damaged(SRSCAN))
 139                         printf(" from %d,%d",
 140                                 Etc.klingon[i].x, Etc.klingon[i].y);
 141                 cas = (shldabsb * 100) / hit;
 142                 hit -= shldabsb;
 143                 if (shldabsb > 0)
 144                         printf(", shields absorb %d%%, effective hit %d\n",
 145                                 cas, hit);
 146                 else
 147                         printf("\n");
 148                 tothit += hit;
 149                 if (hit > maxhit)
 150                         maxhit = hit;
 151                 Ship.energy -= hit;
 152                 /* see if damages occurred */
 153                 if (hit >= (15 - Game.skill) * (25 - ranf(12))) {
 154                         printf("\aCRITICAL HIT!!!\a\n");
 155                         /* select a device from probability vector */
 156                         cas = ranf(1000);
 157                         for (l = 0; cas >= 0; l++)
 158                                 cas -= Param.damprob[l];
 159                         l -= 1;
 160                         /* compute amount of damage */
 161                         extradm = (hit * Param.damfac[l]) /
 162                                 (75 + ranf(25)) + 0.5;
 163                         /* damage the device */
 164                         damage(l, extradm);
 165                         if (damaged(SHIELD)) {
 166                                 if (Ship.shldup)
 167                                         printf("Sulu: Shields knocked down, "
 168                                                "captain.\n");
 169                                 Ship.shldup = 0;
 170                                 Move.shldchg = 0;
 171                         }
 172                 }
 173                 if (Ship.energy <= 0)
 174                         lose(L_DSTRYD);
 175         }
 176
 177         /* see what our casualities are like */
 178         if (maxhit >= 200 || tothit >= 500) {
 179                 cas = tothit * 0.015 * franf();
 180                 if (cas >= 2) {
 181                         printf("McCoy: we suffered %d casualties in that "
 182                                "attack.\n",
 183                                 cas);
 184                         Game.deaths += cas;
 185                         Ship.crew -= cas;
 186                 }
 187         }
 188
 189         /* allow Klingons to move after attacking */
 190         klmove(1);
 191
 192         return;
 193 }