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 1.4 2007/05/13 18:33:55 swildner Exp $
  36  */
  37
  38 # include       "getpar.h"
  39 # include       "trek.h"
  40
  41 /*
  42 **  MOVE UNDER WARP POWER
  43 **
  44 **      This is both the "move" and the "ram" commands, differing
  45 **      only in the flag 'fl'.  It is also used for automatic
  46 **      emergency override mode, when 'fl' is < 0 and 'c' and 'd'
  47 **      are the course and distance to be moved.  If 'fl' >= 0,
  48 **      the course and distance are asked of the captain.
  49 **
  50 **      The guts of this routine are in the routine move(), which
  51 **      is shared with impulse().  Also, the working part of this
  52 **      routine is very small; the rest is to handle the slight chance
  53 **      that you may be moving at some riduculous speed.  In that
  54 **      case, there is code to handle time warps, etc.
  55 */
  56
  57 void
  58 warp(int fl, int c, double d)
  59 {
  60         int                     course;
  61         double                  power;
  62         double                  dist;
  63         double                  p_time;
  64         double                  speed;
  65         double                  frac;
  66         int             percent;
  67         int             i;
  68         char            *s;
  69
  70         if (Ship.cond == DOCKED) {
  71                 printf("%s is docked\n", Ship.shipname);
  72                 return;
  73         }
  74         if (damaged(WARP))
  75         {
  76                 out(WARP);
  77                 return;
  78         }
  79         course = c;
  80         dist = d;
  81
  82         /* check to see that we are not using an absurd amount of power */
  83         power = (dist + 0.05) * Ship.warp3;
  84         percent = 100 * power / Ship.energy + 0.5;
  85         if (percent >= 85)
  86         {
  87                 printf("Scotty: That would consume %d%% of our remaining energy.\n",
  88                         percent);
  89                 if (!getynpar("Are you sure that is wise"))
  90                         return;
  91         }
  92
  93         /* compute the speed we will move at, and the time it will take */
  94         speed = Ship.warp2 / Param.warptime;
  95         p_time = dist / speed;
  96
  97         /* check to see that that value is not ridiculous */
  98         percent = 100 * p_time / Now.time + 0.5;
  99         if (percent >= 85)
 100         {
 101                 printf("Spock: That would take %d%% of our remaining time.\n",
 102                         percent);
 103                 if (!getynpar("Are you sure that is wise"))
 104                         return;
 105         }
 106
 107         /* compute how far we will go if we get damages */
 108         if (Ship.warp > 6.0 && ranf(100) < 20 + 15 * (Ship.warp - 6.0))
 109         {
 110                 frac = franf();
 111                 dist *= frac;
 112                 p_time *= frac;
 113                 damage(WARP, (frac + 1.0) * Ship.warp * (franf() + 0.25) * 0.20);
 114         }
 115
 116         /* do the move */
 117         Move.time = move(fl, course, p_time, speed);
 118
 119         /* see how far we actually went, and decrement energy appropriately */
 120         dist = Move.time * speed;
 121         Ship.energy -= dist * Ship.warp3 * (Ship.shldup + 1);
 122
 123         /* test for bizarre events */
 124         if (Ship.warp <= 9.0)
 125                 return;
 126         printf("\n\n  ___ Speed exceeding warp nine ___\n\n");
 127         sleep(2);
 128         printf("Ship's safety systems malfunction\n");
 129         sleep(2);
 130         printf("Crew experiencing extreme sensory distortion\n");
 131         sleep(4);
 132         if (ranf(100) >= 100 * dist)
 133         {
 134                 printf("Equilibrium restored -- all systems normal\n");
 135                 return;
 136         }
 137
 138         /* select a bizzare thing to happen to us */
 139         percent = ranf(100);
 140         if (percent < 70)
 141         {
 142                 /* time warp */
 143                 if (percent < 35 || !Game.snap)
 144                 {
 145                         /* positive time warp */
 146                         p_time = (Ship.warp - 8.0) * dist * (franf() + 1.0);
 147                         Now.date += p_time;
 148                         printf("Positive time portal entered -- it is now Stardate %.2f\n",
 149                                 Now.date);
 150                         for (i = 0; i < MAXEVENTS; i++)
 151                         {
 152                                 percent = Event[i].evcode;
 153                                 if (percent == E_FIXDV || percent == E_LRTB)
 154                                         Event[i].date += p_time;
 155                         }
 156                         return;
 157                 }
 158
 159                 /* s/he got lucky: a negative time portal */
 160                 p_time = Now.date;
 161                 s = Etc.snapshot;
 162                 bmove(s, Quad, sizeof Quad);
 163                 bmove(s += sizeof Quad, Event, sizeof Event);
 164                 bmove(s += sizeof Event, &Now, sizeof Now);
 165                 printf("Negative time portal entered -- it is now Stardate %.2f\n",
 166                         Now.date);
 167                 for (i = 0; i < MAXEVENTS; i++)
 168                         if (Event[i].evcode == E_FIXDV)
 169                                 reschedule(&Event[i], Event[i].date - p_time);
 170                 return;
 171         }
 172
 173         /* test for just a lot of damage */
 174         if (percent < 80)
 175                 lose(L_TOOFAST);
 176         printf("Equilibrium restored -- extreme damage occurred to ship systems\n");
 177         for (i = 0; i < NDEV; i++)
 178                 damage(i, (3.0 * (franf() + franf()) + 1.0) * Param.damfac[i]);
 179         Ship.shldup = 0;
 180 }
 181
 182 /*
 183  * dowarp() is used in a struct cvntab to call warp().  Since it is always ram
 184  * or move, fl is never < 0, so ask the user for course and distance, then pass
 185  * that to warp().
 186  */
 187 void
 188 dowarp(int fl)
 189 {
 190         int     c;
 191         double  d;
 192
 193         if(getcodi(&c, &d))
 194                 return;
 195         warp(fl, c, d);
 196 }