games/trek/warp.c

   1 /*      $NetBSD: warp.c,v 1.10 2009/05/24 21:44:56 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[] = "@(#)warp.c      8.1 (Berkeley) 5/31/93";
  36 #else
  37 __RCSID("$NetBSD: warp.c,v 1.10 2009/05/24 21:44:56 dholland Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <stdio.h>
  42 #include <math.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45 #include "trek.h"
  46 #include "getpar.h"
  47
  48 /*
  49 **  MOVE UNDER WARP POWER
  50 **
  51 **      This is both the "move" and the "ram" commands, differing
  52 **      only in the flag 'fl'.  It is also used for automatic
  53 **      emergency override mode, when 'fl' is < 0 and 'c' and 'd'
  54 **      are the course and distance to be moved.  If 'fl' >= 0,
  55 **      the course and distance are asked of the captain.
  56 **
  57 **      The guts of this routine are in the routine move(), which
  58 **      is shared with impulse().  Also, the working part of this
  59 **      routine is very small; the rest is to handle the slight chance
  60 **      that you may be moving at some riduculous speed.  In that
  61 **      case, there is code to handle time warps, etc.
  62 */
  63
  64 void
  65 dowarp(int fl)
  66 {
  67         int c;
  68         double d;
  69
  70         if (getcodi(&c, &d))
  71                 return;
  72         warp(fl, c, d);
  73 }
  74
  75 void
  76 warp(int fl, int c, double d)
  77 {
  78         char           *p;
  79         int             course;
  80         double          power;
  81         double          dist;
  82         double          time;
  83         double          speed;
  84         double          frac;
  85         int             percent;
  86         int             i;
  87         double repairs;
  88
  89         if (Ship.cond == DOCKED) {
  90                 printf("%s is docked\n", Ship.shipname);
  91                 return;
  92         }
  93         if (damaged(WARP)) {
  94                 out(WARP);
  95                 return;
  96         }
  97
  98         course = c;
  99         dist = d;
 100
 101         /* check to see that we are not using an absurd amount of power */
 102         power = (dist + 0.05) * Ship.warp3;
 103         percent = 100 * power / Ship.energy + 0.5;
 104         if (percent >= 85) {
 105                 printf("Scotty: That would consume %d%% of our remaining "
 106                        "energy.\n",
 107                         percent);
 108                 if (!getynpar("Are you sure that is wise"))
 109                         return;
 110         }
 111
 112         /* compute the speed we will move at, and the time it will take */
 113         speed = Ship.warp2 / Param.warptime;
 114         time = dist / speed;
 115
 116         /* check to see that that value is not ridiculous */
 117         percent = 100 * time / Now.time + 0.5;
 118         if (percent >= 85) {
 119                 printf("Spock: That would take %d%% of our remaining time.\n",
 120                         percent);
 121                 if (!getynpar("Are you sure that is wise"))
 122                         return;
 123         }
 124
 125         /* compute how far we will go if we get damages */
 126         if (Ship.warp > 6.0 && ranf(100) < 20 + 15 * (Ship.warp - 6.0)) {
 127                 frac = franf();
 128                 dist *= frac;
 129                 time *= frac;
 130                 repairs = (frac + 1.0) * Ship.warp * (franf() + 0.25) * 0.20;
 131                 damage(WARP, repairs);
 132         }
 133
 134         /* do the move */
 135         Move.time = move(fl, course, time, speed);
 136
 137         /* see how far we actually went, and decrement energy appropriately */
 138         dist = Move.time * speed;
 139         Ship.energy -= dist * Ship.warp3 * (Ship.shldup + 1);
 140
 141         /* test for bizarre events */
 142         if (Ship.warp <= 9.0)
 143                 return;
 144         printf("\n\n  ___ Speed exceeding warp nine ___\n\n");
 145         sleep(2);
 146         printf("Ship's safety systems malfunction\n");
 147         sleep(2);
 148         printf("Crew experiencing extreme sensory distortion\n");
 149         sleep(4);
 150         if (ranf(100) >= 100 * dist) {
 151                 printf("Equilibrium restored -- all systems normal\n");
 152                 return;
 153         }
 154
 155         /* select a bizzare thing to happen to us */
 156         percent = ranf(100);
 157         if (percent < 70) {
 158                 /* time warp */
 159                 if (percent < 35 || !Game.snap) {
 160                         /* positive time warp */
 161                         time = (Ship.warp - 8.0) * dist * (franf() + 1.0);
 162                         Now.date += time;
 163                         printf("Positive time portal entered -- "
 164                                "it is now Stardate %.2f\n",
 165                                 Now.date);
 166                         for (i = 0; i < MAXEVENTS; i++) {
 167                                 percent = Event[i].evcode;
 168                                 if (percent == E_FIXDV || percent == E_LRTB)
 169                                         Event[i].date += time;
 170                         }
 171                         return;
 172                 }
 173
 174                 /* s/he got lucky: a negative time portal */
 175                 time = Now.date;
 176                 p = (char *) Etc.snapshot;
 177                 memcpy(p, Quad, sizeof Quad);
 178                 p += sizeof Quad;
 179                 memcpy(p, Event, sizeof Event);
 180                 p += sizeof Event;
 181                 memcpy(p, &Now, sizeof Now);
 182                 printf("Negative time portal entered -- "
 183                        "it is now Stardate %.2f\n",
 184                         Now.date);
 185                 for (i = 0; i < MAXEVENTS; i++)
 186                         if (Event[i].evcode == E_FIXDV)
 187                                 reschedule(&Event[i], Event[i].date - time);
 188                 return;
 189         }
 190
 191         /* test for just a lot of damage */
 192         if (percent < 80)
 193                 lose(L_TOOFAST);
 194         printf("Equilibrium restored -- "
 195                "extreme damage occurred to ship systems\n");
 196         for (i = 0; i < NDEV; i++)
 197                 damage(i, (3.0 * (franf() + franf()) + 1.0) * Param.damfac[i]);
 198         Ship.shldup = 0;
 199 }