trek/warp.c

   1 /*
   2  * Copyright (c) 1980 Regents of the University of California.
   3  * 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
  34 #ifndef lint
  35 /*static char sccsid[] = "from: @(#)warp.c      5.4 (Berkeley) 6/1/90";*/
  36 static char rcsid[] = "$Id: warp.c,v 1.2 1993/08/01 18:49:52 mycroft Exp $";
  37 #endif /* not lint */
  38
  39 # include       "trek.h"
  40
  41 /*
  42 **  MOVE UNDER WARP POWER
  43 **
  44 **      This is both the "move" and the "ram" commands, differing
  45 **      only in the flag 'fl'.  It is also used for automatic
  46 **      emergency override mode, when 'fl' is < 0 and 'c' and 'd'
  47 **      are the course and distance to be moved.  If 'fl' >= 0,
  48 **      the course and distance are asked of the captain.
  49 **
  50 **      The guts of this routine are in the routine move(), which
  51 **      is shared with impulse().  Also, the working part of this
  52 **      routine is very small; the rest is to handle the slight chance
  53 **      that you may be moving at some riduculous speed.  In that
  54 **      case, there is code to handle time warps, etc.
  55 */
  56
  57 warp(fl, c, d)
  58 int     fl, c;
  59 double  d;
  60 {
  61         int                     course;
  62         double                  power;
  63         double                  dist;
  64         double                  time;
  65         double                  speed;
  66         double                  frac;
  67         register int            percent;
  68         register int            i;
  69         extern double           move();
  70
  71         if (Ship.cond == DOCKED)
  72                 return (printf("%s is docked\n", Ship.shipname));
  73         if (damaged(WARP))
  74         {
  75                 return (out(WARP));
  76         }
  77         if (fl < 0)
  78         {
  79                 course = c;
  80                 dist = d;
  81         }
  82         else
  83                 if (getcodi(&course, &dist))
  84                         return;
  85
  86         /* check to see that we are not using an absurd amount of power */
  87         power = (dist + 0.05) * Ship.warp3;
  88         percent = 100 * power / Ship.energy + 0.5;
  89         if (percent >= 85)
  90         {
  91                 printf("Scotty: That would consume %d%% of our remaining energy.\n",
  92                         percent);
  93                 if (!getynpar("Are you sure that is wise"))
  94                         return;
  95         }
  96
  97         /* compute the speed we will move at, and the time it will take */
  98         speed = Ship.warp2 / Param.warptime;
  99         time = dist / speed;
 100
 101         /* check to see that that value is not ridiculous */
 102         percent = 100 * time / Now.time + 0.5;
 103         if (percent >= 85)
 104         {
 105                 printf("Spock: That would take %d%% of our remaining time.\n",
 106                         percent);
 107                 if (!getynpar("Are you sure that is wise"))
 108                         return;
 109         }
 110
 111         /* compute how far we will go if we get damages */
 112         if (Ship.warp > 6.0 && ranf(100) < 20 + 15 * (Ship.warp - 6.0))
 113         {
 114                 frac = franf();
 115                 dist *= frac;
 116                 time *= frac;
 117                 damage(WARP, (frac + 1.0) * Ship.warp * (franf() + 0.25) * 0.20);
 118         }
 119
 120         /* do the move */
 121         Move.time = move(fl, course, time, speed);
 122
 123         /* see how far we actually went, and decrement energy appropriately */
 124         dist = Move.time * speed;
 125         Ship.energy -= dist * Ship.warp3 * (Ship.shldup + 1);
 126
 127         /* test for bizarre events */
 128         if (Ship.warp <= 9.0)
 129                 return;
 130         printf("\n\n  ___ Speed exceeding warp nine ___\n\n");
 131         sleep(2);
 132         printf("Ship's safety systems malfunction\n");
 133         sleep(2);
 134         printf("Crew experiencing extreme sensory distortion\n");
 135         sleep(4);
 136         if (ranf(100) >= 100 * dist)
 137         {
 138                 return (printf("Equilibrium restored -- all systems normal\n"));
 139         }
 140
 141         /* select a bizzare thing to happen to us */
 142         percent = ranf(100);
 143         if (percent < 70)
 144         {
 145                 /* time warp */
 146                 if (percent < 35 || !Game.snap)
 147                 {
 148                         /* positive time warp */
 149                         time = (Ship.warp - 8.0) * dist * (franf() + 1.0);
 150                         Now.date += time;
 151                         printf("Positive time portal entered -- it is now Stardate %.2f\n",
 152                                 Now.date);
 153                         for (i = 0; i < MAXEVENTS; i++)
 154                         {
 155                                 percent = Event[i].evcode;
 156                                 if (percent == E_FIXDV || percent == E_LRTB)
 157                                         Event[i].date += time;
 158                         }
 159                         return;
 160                 }
 161
 162                 /* s/he got lucky: a negative time portal */
 163                 time = Now.date;
 164                 i = (int) Etc.snapshot;
 165                 bmove(i, Quad, sizeof Quad);
 166                 bmove(i += sizeof Quad, Event, sizeof Event);
 167                 bmove(i += sizeof Event, &Now, sizeof Now);
 168                 printf("Negative time portal entered -- it is now Stardate %.2f\n",
 169                         Now.date);
 170                 for (i = 0; i < MAXEVENTS; i++)
 171                         if (Event[i].evcode == E_FIXDV)
 172                                 reschedule(&Event[i], Event[i].date - time);
 173                 return;
 174         }
 175
 176         /* test for just a lot of damage */
 177         if (percent < 80)
 178                 lose(L_TOOFAST);
 179         printf("Equilibrium restored -- extreme damage occured to ship systems\n");
 180         for (i = 0; i < NDEV; i++)
 181                 damage(i, (3.0 * (franf() + franf()) + 1.0) * Param.damfac[i]);
 182         Ship.shldup = 0;
 183 }