trek/warp.c

   1 /*      $NetBSD: warp.c,v 1.5 1997/10/13 22:21:14 cjs 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. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #ifndef lint
  38 #if 0
  39 static char sccsid[] = "@(#)warp.c      8.1 (Berkeley) 5/31/93";
  40 #else
  41 __RCSID("$NetBSD: warp.c,v 1.5 1997/10/13 22:21:14 cjs Exp $");
  42 #endif
  43 #endif /* not lint */
  44
  45 #include <stdio.h>
  46 #include <math.h>
  47 #include <string.h>
  48 #include <unistd.h>
  49 #include "trek.h"
  50 #include "getpar.h"
  51
  52 /*
  53 **  MOVE UNDER WARP POWER
  54 **
  55 **      This is both the "move" and the "ram" commands, differing
  56 **      only in the flag 'fl'.  It is also used for automatic
  57 **      emergency override mode, when 'fl' is < 0 and 'c' and 'd'
  58 **      are the course and distance to be moved.  If 'fl' >= 0,
  59 **      the course and distance are asked of the captain.
  60 **
  61 **      The guts of this routine are in the routine move(), which
  62 **      is shared with impulse().  Also, the working part of this
  63 **      routine is very small; the rest is to handle the slight chance
  64 **      that you may be moving at some riduculous speed.  In that
  65 **      case, there is code to handle time warps, etc.
  66 */
  67
  68 void
  69 dowarp(fl)
  70 {
  71         int c;
  72         double d;
  73
  74         if (getcodi(&c, &d))
  75                 return;
  76         warp(fl, c, d);
  77 }
  78
  79 void
  80 warp(fl, c, d)
  81 int     fl, c;
  82 double  d;
  83 {
  84         char           *p;
  85         int             course;
  86         double          power;
  87         double          dist;
  88         double          time;
  89         double          speed;
  90         double          frac;
  91         int             percent;
  92         int             i;
  93
  94         if (Ship.cond == DOCKED) {
  95                 printf("%s is docked\n", Ship.shipname);
  96                 return;
  97         }
  98         if (damaged(WARP))
  99         {
 100                 out(WARP);
 101                 return;
 102         }
 103
 104         course = c;
 105         dist = d;
 106
 107         /* check to see that we are not using an absurd amount of power */
 108         power = (dist + 0.05) * Ship.warp3;
 109         percent = 100 * power / Ship.energy + 0.5;
 110         if (percent >= 85)
 111         {
 112                 printf("Scotty: That would consume %d%% of our remaining energy.\n",
 113                         percent);
 114                 if (!getynpar("Are you sure that is wise"))
 115                         return;
 116         }
 117
 118         /* compute the speed we will move at, and the time it will take */
 119         speed = Ship.warp2 / Param.warptime;
 120         time = dist / speed;
 121
 122         /* check to see that that value is not ridiculous */
 123         percent = 100 * time / Now.time + 0.5;
 124         if (percent >= 85)
 125         {
 126                 printf("Spock: That would take %d%% of our remaining time.\n",
 127                         percent);
 128                 if (!getynpar("Are you sure that is wise"))
 129                         return;
 130         }
 131
 132         /* compute how far we will go if we get damages */
 133         if (Ship.warp > 6.0 && ranf(100) < 20 + 15 * (Ship.warp - 6.0))
 134         {
 135                 frac = franf();
 136                 dist *= frac;
 137                 time *= frac;
 138                 damage(WARP, (frac + 1.0) * Ship.warp * (franf() + 0.25) * 0.20);
 139         }
 140
 141         /* do the move */
 142         Move.time = move(fl, course, time, speed);
 143
 144         /* see how far we actually went, and decrement energy appropriately */
 145         dist = Move.time * speed;
 146         Ship.energy -= dist * Ship.warp3 * (Ship.shldup + 1);
 147
 148         /* test for bizarre events */
 149         if (Ship.warp <= 9.0)
 150                 return;
 151         printf("\n\n  ___ Speed exceeding warp nine ___\n\n");
 152         sleep(2);
 153         printf("Ship's safety systems malfunction\n");
 154         sleep(2);
 155         printf("Crew experiencing extreme sensory distortion\n");
 156         sleep(4);
 157         if (ranf(100) >= 100 * dist)
 158         {
 159                 printf("Equilibrium restored -- all systems normal\n");
 160                 return;
 161         }
 162
 163         /* select a bizzare thing to happen to us */
 164         percent = ranf(100);
 165         if (percent < 70)
 166         {
 167                 /* time warp */
 168                 if (percent < 35 || !Game.snap)
 169                 {
 170                         /* positive time warp */
 171                         time = (Ship.warp - 8.0) * dist * (franf() + 1.0);
 172                         Now.date += time;
 173                         printf("Positive time portal entered -- it is now Stardate %.2f\n",
 174                                 Now.date);
 175                         for (i = 0; i < MAXEVENTS; i++)
 176                         {
 177                                 percent = Event[i].evcode;
 178                                 if (percent == E_FIXDV || percent == E_LRTB)
 179                                         Event[i].date += time;
 180                         }
 181                         return;
 182                 }
 183
 184                 /* s/he got lucky: a negative time portal */
 185                 time = Now.date;
 186                 p = (char *) Etc.snapshot;
 187                 memcpy(p, Quad, sizeof Quad);
 188                 p += sizeof Quad;
 189                 memcpy(p, Event, sizeof Event);
 190                 p += sizeof Event;
 191                 memcpy(p, &Now, sizeof Now);
 192                 printf("Negative time portal entered -- it is now Stardate %.2f\n",
 193                         Now.date);
 194                 for (i = 0; i < MAXEVENTS; i++)
 195                         if (Event[i].evcode == E_FIXDV)
 196                                 reschedule(&Event[i], Event[i].date - time);
 197                 return;
 198         }
 199
 200         /* test for just a lot of damage */
 201         if (percent < 80)
 202                 lose(L_TOOFAST);
 203         printf("Equilibrium restored -- extreme damage occured to ship systems\n");
 204         for (i = 0; i < NDEV; i++)
 205                 damage(i, (3.0 * (franf() + franf()) + 1.0) * Param.damfac[i]);
 206         Ship.shldup = 0;
 207 }