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