games/trek/attack.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)attack.c 8.1 (Berkeley) 5/31/93
  34  * $FreeBSD: src/games/trek/attack.c,v 1.4 1999/11/30 03:49:43 billf Exp $
  35  * $DragonFly: src/games/trek/attack.c,v 1.3 2006/09/07 21:19:44 pavalos Exp $
  36  */
  37
  38 # include       "trek.h"
  39
  40 /*
  41 **  Klingon Attack Routine
  42 **
  43 **      This routine performs the Klingon attack provided that
  44 **      (1) Something happened this move (i.e., not free), and
  45 **      (2) You are not cloaked.  Note that if you issue the
  46 **      cloak command, you are not considered cloaked until you
  47 **      expend some time.
  48 **
  49 **      Klingons are permitted to move both before and after the
  50 **      attack.  They will tend to move toward you before the
  51 **      attack and away from you after the attack.
  52 **
  53 **      Under certain conditions you can get a critical hit.  This
  54 **      sort of hit damages devices.  The probability that a given
  55 **      device is damaged depends on the device.  Well protected
  56 **      devices (such as the computer, which is in the core of the
  57 **      ship and has considerable redundancy) almost never get
  58 **      damaged, whereas devices which are exposed (such as the
  59 **      warp engines) or which are particularly delicate (such as
  60 **      the transporter) have a much higher probability of being
  61 **      damaged.
  62 **
  63 **      The actual amount of damage (i.e., how long it takes to fix
  64 **      it) depends on the amount of the hit and the "damfac[]"
  65 **      entry for the particular device.
  66 **
  67 **      Casualties can also occur.
  68 */
  69
  70 void
  71 attack(int resting)
  72 /* resting:  set if attack while resting */
  73 {
  74         int             hit, i, l;
  75         int                     maxhit, tothit, shldabsb;
  76         double                  chgfac, propor, extradm;
  77         double                  dustfac, tothe;
  78         int                     cas;
  79         int                     hitflag;
  80
  81         if (Move.free)
  82                 return;
  83         if (Etc.nkling <= 0 || Quad[Ship.quadx][Ship.quady].stars < 0)
  84                 return;
  85         if (Ship.cloaked && Ship.cloakgood)
  86                 return;
  87         /* move before attack */
  88         klmove(0);
  89         if (Ship.cond == DOCKED)
  90         {
  91                 if (!resting)
  92                         printf("Starbase shields protect the %s\n", Ship.shipname);
  93                 return;
  94         }
  95         /* setup shield effectiveness */
  96         chgfac = 1.0;
  97         if (Move.shldchg)
  98                 chgfac = 0.25 + 0.50 * franf();
  99         maxhit = tothit = 0;
 100         hitflag = 0;
 101
 102         /* let each Klingon do his damndest */
 103         for (i = 0; i < Etc.nkling; i++)
 104         {
 105                 /* if he's low on power he won't attack */
 106                 if (Etc.klingon[i].power < 20)
 107                         continue;
 108                 if (!hitflag)
 109                 {
 110                         printf("\nStardate %.2f: Klingon attack:\n",
 111                                 Now.date);
 112                         hitflag++;
 113                 }
 114                 /* complete the hit */
 115                 dustfac = 0.90 + 0.01 * franf();
 116                 tothe = Etc.klingon[i].avgdist;
 117                 hit = Etc.klingon[i].power * pow(dustfac, tothe) * Param.hitfac;
 118                 /* deplete his energy */
 119                 dustfac = Etc.klingon[i].power;
 120                 Etc.klingon[i].power = dustfac * Param.phasfac * (1.0 + (franf() - 0.5) * 0.2);
 121                 /* see how much of hit shields will absorb */
 122                 shldabsb = 0;
 123                 if (Ship.shldup || Move.shldchg)
 124                 {
 125                         propor = Ship.shield;
 126                         propor /= Param.shield;
 127                         shldabsb = propor * chgfac * hit;
 128                         if (shldabsb > Ship.shield)
 129                                 shldabsb = Ship.shield;
 130                         Ship.shield -= shldabsb;
 131                 }
 132                 /* actually do the hit */
 133                 printf("\aHIT: %d units", hit);
 134                 if (!damaged(SRSCAN))
 135                         printf(" from %d,%d", Etc.klingon[i].x, Etc.klingon[i].y);
 136                 cas = (shldabsb * 100) / hit;
 137                 hit -= shldabsb;
 138                 if (shldabsb > 0)
 139                         printf(", shields absorb %d%%, effective hit %d\n",
 140                                 cas, hit);
 141                 else
 142                         printf("\n");
 143                 tothit += hit;
 144                 if (hit > maxhit)
 145                         maxhit = hit;
 146                 Ship.energy -= hit;
 147                 /* see if damages occurred */
 148                 if (hit >= (15 - Game.skill) * (25 - ranf(12)))
 149                 {
 150                         printf("\aCRITICAL HIT!!!\a\n");
 151                         /* select a device from probability vector */
 152                         cas = ranf(1000);
 153                         for (l = 0; cas >= 0; l++)
 154                                 cas -= Param.damprob[l];
 155                         l -= 1;
 156                         /* compute amount of damage */
 157                         extradm = (hit * Param.damfac[l]) / (75 + ranf(25)) + 0.5;
 158                         /* damage the device */
 159                         damage(l, extradm);
 160                         if (damaged(SHIELD))
 161                         {
 162                                 if (Ship.shldup)
 163                                         printf("Sulu: Shields knocked down, captain.\n");
 164                                 Ship.shldup = 0;
 165                                 Move.shldchg = 0;
 166                         }
 167                 }
 168                 if (Ship.energy <= 0)
 169                         lose(L_DSTRYD);
 170         }
 171
 172         /* see what our casualities are like */
 173         if (maxhit >= 200 || tothit >= 500)
 174         {
 175                 cas = tothit * 0.015 * franf();
 176                 if (cas >= 2)
 177                 {
 178                         printf("McCoy: we suffered %d casualties in that attack.\n",
 179                                 cas);
 180                         Game.deaths += cas;
 181                         Ship.crew -= cas;
 182                 }
 183         }
 184
 185         /* allow Klingons to move after attacking */
 186         klmove(1);
 187
 188         return;
 189 }