trek/warp.c

   1 /*      $NetBSD: warp.c,v 1.9 2009/05/24 19:18:44 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 1.9 2009/05/24 19:18:44 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
  88         if (Ship.cond == DOCKED) {
  89                 printf("%s is docked\n", Ship.shipname);
  90                 return;
  91         }
  92         if (damaged(WARP))
  93         {
  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         {
 106                 printf("Scotty: That would consume %d%% of our remaining 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         {
 120                 printf("Spock: That would take %d%% of our remaining time.\n",
 121                         percent);
 122                 if (!getynpar("Are you sure that is wise"))
 123                         return;
 124         }
 125
 126         /* compute how far we will go if we get damages */
 127         if (Ship.warp > 6.0 && ranf(100) < 20 + 15 * (Ship.warp - 6.0))
 128         {
 129                 frac = franf();
 130                 dist *= frac;
 131                 time *= frac;
 132                 damage(WARP, (frac + 1.0) * Ship.warp * (franf() + 0.25) * 0.20);
 133         }
 134
 135         /* do the move */
 136         Move.time = move(fl, course, time, speed);
 137
 138         /* see how far we actually went, and decrement energy appropriately */
 139         dist = Move.time * speed;
 140         Ship.energy -= dist * Ship.warp3 * (Ship.shldup + 1);
 141
 142         /* test for bizarre events */
 143         if (Ship.warp <= 9.0)
 144                 return;
 145         printf("\n\n  ___ Speed exceeding warp nine ___\n\n");
 146         sleep(2);
 147         printf("Ship's safety systems malfunction\n");
 148         sleep(2);
 149         printf("Crew experiencing extreme sensory distortion\n");
 150         sleep(4);
 151         if (ranf(100) >= 100 * dist)
 152         {
 153                 printf("Equilibrium restored -- all systems normal\n");
 154                 return;
 155         }
 156
 157         /* select a bizzare thing to happen to us */
 158         percent = ranf(100);
 159         if (percent < 70)
 160         {
 161                 /* time warp */
 162                 if (percent < 35 || !Game.snap)
 163                 {
 164                         /* positive time warp */
 165                         time = (Ship.warp - 8.0) * dist * (franf() + 1.0);
 166                         Now.date += time;
 167                         printf("Positive time portal entered -- it is now Stardate %.2f\n",
 168                                 Now.date);
 169                         for (i = 0; i < MAXEVENTS; i++)
 170                         {
 171                                 percent = Event[i].evcode;
 172                                 if (percent == E_FIXDV || percent == E_LRTB)
 173                                         Event[i].date += time;
 174                         }
 175                         return;
 176                 }
 177
 178                 /* s/he got lucky: a negative time portal */
 179                 time = Now.date;
 180                 p = (char *) Etc.snapshot;
 181                 memcpy(p, Quad, sizeof Quad);
 182                 p += sizeof Quad;
 183                 memcpy(p, Event, sizeof Event);
 184                 p += sizeof Event;
 185                 memcpy(p, &Now, sizeof Now);
 186                 printf("Negative time portal entered -- it is now Stardate %.2f\n",
 187                         Now.date);
 188                 for (i = 0; i < MAXEVENTS; i++)
 189                         if (Event[i].evcode == E_FIXDV)
 190                                 reschedule(&Event[i], Event[i].date - time);
 191                 return;
 192         }
 193
 194         /* test for just a lot of damage */
 195         if (percent < 80)
 196                 lose(L_TOOFAST);
 197         printf("Equilibrium restored -- extreme damage occurred to ship systems\n");
 198         for (i = 0; i < NDEV; i++)
 199                 damage(i, (3.0 * (franf() + franf()) + 1.0) * Param.damfac[i]);
 200         Ship.shldup = 0;
 201 }