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 1.2 2003/06/17 04:25:25 dillon 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 attack(resting)
  71 int     resting;        /* set if attack while resting */
  72 {
  73         int             hit, i, l;
  74         int                     maxhit, tothit, shldabsb;
  75         double                  chgfac, propor, extradm;
  76         double                  dustfac, tothe;
  77         int                     cas;
  78         int                     hitflag;
  79
  80         if (Move.free)
  81                 return;
  82         if (Etc.nkling <= 0 || Quad[Ship.quadx][Ship.quady].stars < 0)
  83                 return;
  84         if (Ship.cloaked && Ship.cloakgood)
  85                 return;
  86         /* move before attack */
  87         klmove(0);
  88         if (Ship.cond == DOCKED)
  89         {
  90                 if (!resting)
  91                         printf("Starbase shields protect the %s\n", Ship.shipname);
  92                 return;
  93         }
  94         /* setup shield effectiveness */
  95         chgfac = 1.0;
  96         if (Move.shldchg)
  97                 chgfac = 0.25 + 0.50 * franf();
  98         maxhit = tothit = 0;
  99         hitflag = 0;
 100
 101         /* let each Klingon do his damndest */
 102         for (i = 0; i < Etc.nkling; i++)
 103         {
 104                 /* if he's low on power he won't attack */
 105                 if (Etc.klingon[i].power < 20)
 106                         continue;
 107                 if (!hitflag)
 108                 {
 109                         printf("\nStardate %.2f: Klingon attack:\n",
 110                                 Now.date);
 111                         hitflag++;
 112                 }
 113                 /* complete the hit */
 114                 dustfac = 0.90 + 0.01 * franf();
 115                 tothe = Etc.klingon[i].avgdist;
 116                 hit = Etc.klingon[i].power * pow(dustfac, tothe) * Param.hitfac;
 117                 /* deplete his energy */
 118                 dustfac = Etc.klingon[i].power;
 119                 Etc.klingon[i].power = dustfac * Param.phasfac * (1.0 + (franf() - 0.5) * 0.2);
 120                 /* see how much of hit shields will absorb */
 121                 shldabsb = 0;
 122                 if (Ship.shldup || Move.shldchg)
 123                 {
 124                         propor = Ship.shield;
 125                         propor /= Param.shield;
 126                         shldabsb = propor * chgfac * hit;
 127                         if (shldabsb > Ship.shield)
 128                                 shldabsb = Ship.shield;
 129                         Ship.shield -= shldabsb;
 130                 }
 131                 /* actually do the hit */
 132                 printf("\aHIT: %d units", hit);
 133                 if (!damaged(SRSCAN))
 134                         printf(" from %d,%d", Etc.klingon[i].x, Etc.klingon[i].y);
 135                 cas = (shldabsb * 100) / hit;
 136                 hit -= shldabsb;
 137                 if (shldabsb > 0)
 138                         printf(", shields absorb %d%%, effective hit %d\n",
 139                                 cas, hit);
 140                 else
 141                         printf("\n");
 142                 tothit += hit;
 143                 if (hit > maxhit)
 144                         maxhit = hit;
 145                 Ship.energy -= hit;
 146                 /* see if damages occurred */
 147                 if (hit >= (15 - Game.skill) * (25 - ranf(12)))
 148                 {
 149                         printf("\aCRITICAL HIT!!!\a\n");
 150                         /* select a device from probability vector */
 151                         cas = ranf(1000);
 152                         for (l = 0; cas >= 0; l++)
 153                                 cas -= Param.damprob[l];
 154                         l -= 1;
 155                         /* compute amount of damage */
 156                         extradm = (hit * Param.damfac[l]) / (75 + ranf(25)) + 0.5;
 157                         /* damage the device */
 158                         damage(l, extradm);
 159                         if (damaged(SHIELD))
 160                         {
 161                                 if (Ship.shldup)
 162                                         printf("Sulu: Shields knocked down, captain.\n");
 163                                 Ship.shldup = 0;
 164                                 Move.shldchg = 0;
 165                         }
 166                 }
 167                 if (Ship.energy <= 0)
 168                         lose(L_DSTRYD);
 169         }
 170
 171         /* see what our casualities are like */
 172         if (maxhit >= 200 || tothit >= 500)
 173         {
 174                 cas = tothit * 0.015 * franf();
 175                 if (cas >= 2)
 176                 {
 177                         printf("McCoy: we suffered %d casualties in that attack.\n",
 178                                 cas);
 179                         Game.deaths += cas;
 180                         Ship.crew -= cas;
 181                 }
 182         }
 183
 184         /* allow Klingons to move after attacking */
 185         klmove(1);
 186
 187         return;
 188 }