games/trek/warp.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  * @(#)warp.c   8.1 (Berkeley) 5/31/93
  34  * $FreeBSD: src/games/trek/warp.c,v 1.4 1999/11/30 03:49:56 billf Exp $
  35  * $DragonFly: src/games/trek/warp.c,v 1.2 2003/06/17 04:25:25 dillon Exp $
  36  */
  37
  38 # include       "trek.h"
  39
  40 /*
  41 **  MOVE UNDER WARP POWER
  42 **
  43 **      This is both the "move" and the "ram" commands, differing
  44 **      only in the flag 'fl'.  It is also used for automatic
  45 **      emergency override mode, when 'fl' is < 0 and 'c' and 'd'
  46 **      are the course and distance to be moved.  If 'fl' >= 0,
  47 **      the course and distance are asked of the captain.
  48 **
  49 **      The guts of this routine are in the routine move(), which
  50 **      is shared with impulse().  Also, the working part of this
  51 **      routine is very small; the rest is to handle the slight chance
  52 **      that you may be moving at some riduculous speed.  In that
  53 **      case, there is code to handle time warps, etc.
  54 */
  55
  56 warp(fl, c, d)
  57 int     fl, c;
  58 double  d;
  59 {
  60         int                     course;
  61         double                  power;
  62         double                  dist;
  63         double                  time;
  64         double                  speed;
  65         double                  frac;
  66         int             percent;
  67         int             i;
  68         extern double           move();
  69
  70         if (Ship.cond == DOCKED)
  71                 return (printf("%s is docked\n", Ship.shipname));
  72         if (damaged(WARP))
  73         {
  74                 return (out(WARP));
  75         }
  76         if (fl < 0)
  77         {
  78                 course = c;
  79                 dist = d;
  80         }
  81         else
  82                 if (getcodi(&course, &dist))
  83                         return;
  84
  85         /* check to see that we are not using an absurd amount of power */
  86         power = (dist + 0.05) * Ship.warp3;
  87         percent = 100 * power / Ship.energy + 0.5;
  88         if (percent >= 85)
  89         {
  90                 printf("Scotty: That would consume %d%% of our remaining energy.\n",
  91                         percent);
  92                 if (!getynpar("Are you sure that is wise"))
  93                         return;
  94         }
  95
  96         /* compute the speed we will move at, and the time it will take */
  97         speed = Ship.warp2 / Param.warptime;
  98         time = dist / speed;
  99
 100         /* check to see that that value is not ridiculous */
 101         percent = 100 * time / Now.time + 0.5;
 102         if (percent >= 85)
 103         {
 104                 printf("Spock: That would take %d%% of our remaining time.\n",
 105                         percent);
 106                 if (!getynpar("Are you sure that is wise"))
 107                         return;
 108         }
 109
 110         /* compute how far we will go if we get damages */
 111         if (Ship.warp > 6.0 && ranf(100) < 20 + 15 * (Ship.warp - 6.0))
 112         {
 113                 frac = franf();
 114                 dist *= frac;
 115                 time *= frac;
 116                 damage(WARP, (frac + 1.0) * Ship.warp * (franf() + 0.25) * 0.20);
 117         }
 118
 119         /* do the move */
 120         Move.time = move(fl, course, time, speed);
 121
 122         /* see how far we actually went, and decrement energy appropriately */
 123         dist = Move.time * speed;
 124         Ship.energy -= dist * Ship.warp3 * (Ship.shldup + 1);
 125
 126         /* test for bizarre events */
 127         if (Ship.warp <= 9.0)
 128                 return;
 129         printf("\n\n  ___ Speed exceeding warp nine ___\n\n");
 130         sleep(2);
 131         printf("Ship's safety systems malfunction\n");
 132         sleep(2);
 133         printf("Crew experiencing extreme sensory distortion\n");
 134         sleep(4);
 135         if (ranf(100) >= 100 * dist)
 136         {
 137                 return (printf("Equilibrium restored -- all systems normal\n"));
 138         }
 139
 140         /* select a bizzare thing to happen to us */
 141         percent = ranf(100);
 142         if (percent < 70)
 143         {
 144                 /* time warp */
 145                 if (percent < 35 || !Game.snap)
 146                 {
 147                         /* positive time warp */
 148                         time = (Ship.warp - 8.0) * dist * (franf() + 1.0);
 149                         Now.date += time;
 150                         printf("Positive time portal entered -- it is now Stardate %.2f\n",
 151                                 Now.date);
 152                         for (i = 0; i < MAXEVENTS; i++)
 153                         {
 154                                 percent = Event[i].evcode;
 155                                 if (percent == E_FIXDV || percent == E_LRTB)
 156                                         Event[i].date += time;
 157                         }
 158                         return;
 159                 }
 160
 161                 /* s/he got lucky: a negative time portal */
 162                 time = Now.date;
 163                 i = (int) Etc.snapshot;
 164                 bmove(i, Quad, sizeof Quad);
 165                 bmove(i += sizeof Quad, Event, sizeof Event);
 166                 bmove(i += sizeof Event, &Now, sizeof Now);
 167                 printf("Negative time portal entered -- it is now Stardate %.2f\n",
 168                         Now.date);
 169                 for (i = 0; i < MAXEVENTS; i++)
 170                         if (Event[i].evcode == E_FIXDV)
 171                                 reschedule(&Event[i], Event[i].date - time);
 172                 return;
 173         }
 174
 175         /* test for just a lot of damage */
 176         if (percent < 80)
 177                 lose(L_TOOFAST);
 178         printf("Equilibrium restored -- extreme damage occured to ship systems\n");
 179         for (i = 0; i < NDEV; i++)
 180                 damage(i, (3.0 * (franf() + franf()) + 1.0) * Param.damfac[i]);
 181         Ship.shldup = 0;
 182 }