games/trek/help.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  * @(#)help.c   8.1 (Berkeley) 5/31/93
  34  * $FreeBSD: src/games/trek/help.c,v 1.4 1999/11/30 03:49:48 billf Exp $
  35  * $DragonFly: src/games/trek/help.c,v 1.3 2006/09/07 21:19:44 pavalos Exp $
  36  */
  37
  38 # include       "trek.h"
  39
  40 /*
  41 **  call starbase for help
  42 **
  43 **      First, the closest starbase is selected.  If there is a
  44 **      a starbase in your own quadrant, you are in good shape.
  45 **      This distance takes quadrant distances into account only.
  46 **
  47 **      A magic number is computed based on the distance which acts
  48 **      as the probability that you will be rematerialized.  You
  49 **      get three tries.
  50 **
  51 **      When it is determined that you should be able to be remater-
  52 **      ialized (i.e., when the probability thing mentioned above
  53 **      comes up positive), you are put into that quadrant (anywhere).
  54 **      Then, we try to see if there is a spot adjacent to the star-
  55 **      base.  If not, you can't be rematerialized!!!  Otherwise,
  56 **      it drops you there.  It only tries five times to find a spot
  57 **      to drop you.  After that, it's your problem.
  58 */
  59
  60 const char      *Cntvect[3] =
  61 {"first", "second", "third"};
  62
  63 void
  64 help(__unused int unused)
  65 {
  66         int             i;
  67         double                  dist, x;
  68         int             dx, dy;
  69         int                     j, l = 0;
  70
  71         /* check to see if calling for help is reasonable ... */
  72         if (Ship.cond == DOCKED) {
  73                 printf("Uhura: But Captain, we're already docked\n");
  74                 return;
  75         }
  76         /* or possible */
  77         if (damaged(SSRADIO)) {
  78                 out(SSRADIO);
  79                 return;
  80         }
  81         if (Now.bases <= 0) {
  82                 printf("Uhura: I'm not getting any response from starbase\n");
  83                 return;
  84         }
  85         /* tut tut, there goes the score */
  86         Game.helps += 1;
  87
  88         /* find the closest base */
  89         dist = 1e50;
  90         if (Quad[Ship.quadx][Ship.quady].bases <= 0)
  91         {
  92                 /* there isn't one in this quadrant */
  93                 for (i = 0; i < Now.bases; i++)
  94                 {
  95                         /* compute distance */
  96                         dx = Now.base[i].x - Ship.quadx;
  97                         dy = Now.base[i].y - Ship.quady;
  98                         x = dx * dx + dy * dy;
  99                         x = sqrt(x);
 100
 101                         /* see if better than what we already have */
 102                         if (x < dist)
 103                         {
 104                                 dist = x;
 105                                 l = i;
 106                         }
 107                 }
 108
 109                 /* go to that quadrant */
 110                 Ship.quadx = Now.base[l].x;
 111                 Ship.quady = Now.base[l].y;
 112                 initquad(1);
 113         }
 114         else
 115         {
 116                 dist = 0.0;
 117         }
 118
 119         /* dematerialize the Enterprise */
 120         Sect[Ship.sectx][Ship.secty] = EMPTY;
 121         printf("Starbase in %d,%d responds\n", Ship.quadx, Ship.quady);
 122
 123         /* this next thing acts as a probability that it will work */
 124         x = pow(1.0 - pow(0.94, dist), 0.3333333);
 125
 126         /* attempt to rematerialize */
 127         for (i = 0; i < 3; i++)
 128         {
 129                 sleep(2);
 130                 printf("%s attempt to rematerialize ", Cntvect[i]);
 131                 if (franf() > x)
 132                 {
 133                         /* ok, that's good.  let's see if we can set her down */
 134                         for (j = 0; j < 5; j++)
 135                         {
 136                                 dx = Etc.starbase.x + ranf(3) - 1;
 137                                 if (dx < 0 || dx >= NSECTS)
 138                                         continue;
 139                                 dy = Etc.starbase.y + ranf(3) - 1;
 140                                 if (dy < 0 || dy >= NSECTS || Sect[dx][dy] != EMPTY)
 141                                         continue;
 142                                 break;
 143                         }
 144                         if (j < 5)
 145                         {
 146                                 /* found an empty spot */
 147                                 printf("succeeds\n");
 148                                 Ship.sectx = dx;
 149                                 Ship.secty = dy;
 150                                 Sect[dx][dy] = Ship.ship;
 151                                 dock(0);
 152                                 compkldist(0);
 153                                 return;
 154                         }
 155                         /* the starbase must have been surrounded */
 156                 }
 157                 printf("fails\n");
 158         }
 159
 160         /* one, two, three strikes, you're out */
 161         lose(L_NOHELP);
 162 }