games/trek/warp.c

   1 /*      @(#)warp.c      8.1 (Berkeley) 5/31/93                          */
   2 /*      $NetBSD: warp.c,v 1.11 2009/05/24 22:55:03 dholland Exp $       */
   3
   4 /*
   5  * Copyright (c) 1980, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <stdio.h>
  34 #include <math.h>
  35 #include <string.h>
  36 #include <unistd.h>
  37 #include "trek.h"
  38 #include "getpar.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 void
  57 dowarp(int fl)
  58 {
  59         int c;
  60         double d;
  61
  62         if (getcodi(&c, &d))
  63                 return;
  64         warp(fl, c, d);
  65 }
  66
  67 void
  68 warp(int fl, int c, double d)
  69 {
  70         char           *p;
  71         int             course;
  72         double          power;
  73         double          dist;
  74         double          time;
  75         double          speed;
  76         double          frac;
  77         int             percent;
  78         int             i;
  79         double repairs;
  80
  81         if (Ship.cond == DOCKED) {
  82                 printf("%s is docked\n", Ship.shipname);
  83                 return;
  84         }
  85         if (damaged(WARP)) {
  86                 out(WARP);
  87                 return;
  88         }
  89
  90         course = c;
  91         dist = d;
  92
  93         /* check to see that we are not using an absurd amount of power */
  94         power = (dist + 0.05) * Ship.warp3;
  95         percent = 100 * power / Ship.energy + 0.5;
  96         if (percent >= 85) {
  97                 printf("Scotty: That would consume %d%% of our remaining "
  98                        "energy.\n",
  99                         percent);
 100                 if (!getynpar("Are you sure that is wise"))
 101                         return;
 102         }
 103
 104         /* compute the speed we will move at, and the time it will take */
 105         speed = Ship.warp2 / Param.warptime;
 106         time = dist / speed;
 107
 108         /* check to see that that value is not ridiculous */
 109         percent = 100 * time / Now.time + 0.5;
 110         if (percent >= 85) {
 111                 printf("Spock: That would take %d%% of our remaining time.\n",
 112                         percent);
 113                 if (!getynpar("Are you sure that is wise"))
 114                         return;
 115         }
 116
 117         /* compute how far we will go if we get damages */
 118         if (Ship.warp > 6.0 && ranf(100) < 20 + 15 * (Ship.warp - 6.0)) {
 119                 frac = franf();
 120                 dist *= frac;
 121                 time *= frac;
 122                 repairs = (frac + 1.0) * Ship.warp * (franf() + 0.25) * 0.20;
 123                 damage(WARP, repairs);
 124         }
 125
 126         /* do the move */
 127         Move.time = move(fl, course, time, speed);
 128
 129         /* see how far we actually went, and decrement energy appropriately */
 130         dist = Move.time * speed;
 131         Ship.energy -= dist * Ship.warp3 * (Ship.shldup + 1);
 132
 133         /* test for bizarre events */
 134         if (Ship.warp <= 9.0)
 135                 return;
 136         printf("\n\n  ___ Speed exceeding warp nine ___\n\n");
 137         sleep(2);
 138         printf("Ship's safety systems malfunction\n");
 139         sleep(2);
 140         printf("Crew experiencing extreme sensory distortion\n");
 141         sleep(4);
 142         if (ranf(100) >= 100 * dist) {
 143                 printf("Equilibrium restored -- all systems normal\n");
 144                 return;
 145         }
 146
 147         /* select a bizzare thing to happen to us */
 148         percent = ranf(100);
 149         if (percent < 70) {
 150                 /* time warp */
 151                 if (percent < 35 || !Game.snap) {
 152                         /* positive time warp */
 153                         time = (Ship.warp - 8.0) * dist * (franf() + 1.0);
 154                         Now.date += time;
 155                         printf("Positive time portal entered -- "
 156                                "it is now Stardate %.2f\n",
 157                                 Now.date);
 158                         for (i = 0; i < MAXEVENTS; i++) {
 159                                 percent = Event[i].evcode;
 160                                 if (percent == E_FIXDV || percent == E_LRTB)
 161                                         Event[i].date += time;
 162                         }
 163                         return;
 164                 }
 165
 166                 /* s/he got lucky: a negative time portal */
 167                 time = Now.date;
 168                 p = (char *) Etc.snapshot;
 169                 memcpy(p, Quad, sizeof Quad);
 170                 p += sizeof Quad;
 171                 memcpy(p, Event, sizeof Event);
 172                 p += sizeof Event;
 173                 memcpy(p, &Now, sizeof Now);
 174                 printf("Negative time portal entered -- "
 175                        "it is now Stardate %.2f\n",
 176                         Now.date);
 177                 for (i = 0; i < MAXEVENTS; i++)
 178                         if (Event[i].evcode == E_FIXDV)
 179                                 reschedule(&Event[i], Event[i].date - time);
 180                 return;
 181         }
 182
 183         /* test for just a lot of damage */
 184         if (percent < 80)
 185                 lose(L_TOOFAST);
 186         printf("Equilibrium restored -- "
 187                "extreme damage occurred to ship systems\n");
 188         for (i = 0; i < NDEV; i++)
 189                 damage(i, (3.0 * (franf() + franf()) + 1.0) * Param.damfac[i]);
 190         Ship.shldup = 0;
 191 }