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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)warp.c   8.1 (Berkeley) 5/31/93
  30  * $FreeBSD: src/games/trek/warp.c,v 1.4 1999/11/30 03:49:56 billf Exp $
  31  * $DragonFly: src/games/trek/warp.c,v 1.4 2007/05/13 18:33:55 swildner Exp $
  32  */
  33
  34 #include "trek.h"
  35 #include "getpar.h"
  36
  37 /*
  38 **  MOVE UNDER WARP POWER
  39 **
  40 **      This is both the "move" and the "ram" commands, differing
  41 **      only in the flag 'fl'.  It is also used for automatic
  42 **      emergency override mode, when 'fl' is < 0 and 'c' and 'd'
  43 **      are the course and distance to be moved.  If 'fl' >= 0,
  44 **      the course and distance are asked of the captain.
  45 **
  46 **      The guts of this routine are in the routine move(), which
  47 **      is shared with impulse().  Also, the working part of this
  48 **      routine is very small; the rest is to handle the slight chance
  49 **      that you may be moving at some riduculous speed.  In that
  50 **      case, there is code to handle time warps, etc.
  51 */
  52
  53 /*
  54  * dowarp() is used in a struct cvntab to call warp().  Since it is always ram
  55  * or move, fl is never < 0, so ask the user for course and distance, then pass
  56  * that to warp().
  57  */
  58 void
  59 dowarp(int fl)
  60 {
  61         int     c;
  62         double  d;
  63
  64         if (getcodi(&c, &d))
  65                 return;
  66         warp(fl, c, d);
  67 }
  68
  69 void
  70 warp(int fl, int c, double d)
  71 {
  72         int             course;
  73         double          power;
  74         double          dist;
  75         double          p_time;
  76         double          speed;
  77         double          frac;
  78         int             percent;
  79         int             i;
  80         char            *s;
  81
  82         if (Ship.cond == DOCKED) {
  83                 printf("%s is docked\n", Ship.shipname);
  84                 return;
  85         }
  86         if (damaged(WARP)) {
  87                 out(WARP);
  88                 return;
  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 energy.\n",
  98                         percent);
  99                 if (!getynpar("Are you sure that is wise"))
 100                         return;
 101         }
 102
 103         /* compute the speed we will move at, and the time it will take */
 104         speed = Ship.warp2 / Param.warptime;
 105         p_time = dist / speed;
 106
 107         /* check to see that that value is not ridiculous */
 108         percent = 100 * p_time / Now.time + 0.5;
 109         if (percent >= 85) {
 110                 printf("Spock: That would take %d%% of our remaining time.\n",
 111                         percent);
 112                 if (!getynpar("Are you sure that is wise"))
 113                         return;
 114         }
 115
 116         /* compute how far we will go if we get damages */
 117         if (Ship.warp > 6.0 && ranf(100) < 20 + 15 * (Ship.warp - 6.0)) {
 118                 frac = franf();
 119                 dist *= frac;
 120                 p_time *= frac;
 121                 damage(WARP, (frac + 1.0) * Ship.warp * (franf() + 0.25) * 0.20);
 122         }
 123
 124         /* do the move */
 125         Move.time = move(fl, course, p_time, speed);
 126
 127         /* see how far we actually went, and decrement energy appropriately */
 128         dist = Move.time * speed;
 129         Ship.energy -= dist * Ship.warp3 * (Ship.shldup + 1);
 130
 131         /* test for bizarre events */
 132         if (Ship.warp <= 9.0)
 133                 return;
 134         printf("\n\n  ___ Speed exceeding warp nine ___\n\n");
 135         sleep(2);
 136         printf("Ship's safety systems malfunction\n");
 137         sleep(2);
 138         printf("Crew experiencing extreme sensory distortion\n");
 139         sleep(4);
 140         if (ranf(100) >= 100 * dist) {
 141                 printf("Equilibrium restored -- all systems normal\n");
 142                 return;
 143         }
 144
 145         /* select a bizzare thing to happen to us */
 146         percent = ranf(100);
 147         if (percent < 70) {
 148                 /* time warp */
 149                 if (percent < 35 || !Game.snap) {
 150                         /* positive time warp */
 151                         p_time = (Ship.warp - 8.0) * dist * (franf() + 1.0);
 152                         Now.date += p_time;
 153                         printf("Positive time portal entered -- it is now Stardate %.2f\n",
 154                                 Now.date);
 155                         for (i = 0; i < MAXEVENTS; i++) {
 156                                 percent = Event[i].evcode;
 157                                 if (percent == E_FIXDV || percent == E_LRTB)
 158                                         Event[i].date += p_time;
 159                         }
 160                         return;
 161                 }
 162
 163                 /* s/he got lucky: a negative time portal */
 164                 p_time = Now.date;
 165                 s = Etc.snapshot;
 166                 bmove(s, Quad, sizeof Quad);
 167                 bmove(s += sizeof Quad, Event, sizeof Event);
 168                 bmove(s += sizeof Event, &Now, sizeof Now);
 169                 printf("Negative time portal entered -- it is now Stardate %.2f\n",
 170                         Now.date);
 171                 for (i = 0; i < MAXEVENTS; i++)
 172                         if (Event[i].evcode == E_FIXDV)
 173                                 reschedule(&Event[i], Event[i].date - p_time);
 174                 return;
 175         }
 176
 177         /* test for just a lot of damage */
 178         if (percent < 80)
 179                 lose(L_TOOFAST);
 180         printf("Equilibrium restored -- extreme damage occurred to ship systems\n");
 181         for (i = 0; i < NDEV; i++)
 182                 damage(i, (3.0 * (franf() + franf()) + 1.0) * Param.damfac[i]);
 183         Ship.shldup = 0;
 184 }