trek/klmove.c

   1 /*      $NetBSD: klmove.c,v 1.5 2003/08/07 09:37:52 agc 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. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)klmove.c    8.1 (Berkeley) 5/31/93";
  36 #else
  37 __RCSID("$NetBSD: klmove.c,v 1.5 2003/08/07 09:37:52 agc Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <stdio.h>
  42 #include "trek.h"
  43
  44 /*
  45 **  Move Klingons Around
  46 **
  47 **      This is a largely incomprehensible block of code that moves
  48 **      Klingons around in a quadrant.  It was written in a very
  49 **      "program as you go" fashion, and is a prime candidate for
  50 **      rewriting.
  51 **
  52 **      The flag `fl' is zero before an attack, one after an attack,
  53 **      and two if you are leaving a quadrant.  This serves to
  54 **      change the probability and distance that it moves.
  55 **
  56 **      Basically, what it will try to do is to move a certain number
  57 **      of steps either toward you or away from you.  It will avoid
  58 **      stars whenever possible.  Nextx and nexty are the next
  59 **      sector to move to on a per-Klingon basis; they are roughly
  60 **      equivalent to Ship.sectx and Ship.secty for the starship.  Lookx and
  61 **      looky are the sector that you are going to look at to see
  62 **      if you can move their.  Dx and dy are the increment.  Fudgex
  63 **      and fudgey are the things you change around to change your
  64 **      course around stars.
  65 */
  66
  67 void
  68 klmove(fl)
  69 int     fl;
  70 {
  71         int                     n;
  72         struct kling    *k;
  73         double                  dx, dy;
  74         int                     nextx, nexty;
  75         int             lookx, looky;
  76         int                     motion;
  77         int                     fudgex, fudgey;
  78         int                     qx, qy;
  79         double                  bigger;
  80         int                     i;
  81
  82 #       ifdef xTRACE
  83         if (Trace)
  84                 printf("klmove: fl = %d, Etc.nkling = %d\n", fl, Etc.nkling);
  85 #       endif
  86         for (n = 0; n < Etc.nkling; n++)
  87         {
  88                 k = &Etc.klingon[n];
  89                 i = 100;
  90                 if (fl)
  91                         i = 100.0 * k->power / Param.klingpwr;
  92                 if (ranf(i) >= Param.moveprob[2 * Move.newquad + fl])
  93                         continue;
  94                 /* compute distance to move */
  95                 motion = ranf(75) - 25;
  96                 motion *= k->avgdist * Param.movefac[2 * Move.newquad + fl];
  97                 /* compute direction */
  98                 dx = Ship.sectx - k->x + ranf(3) - 1;
  99                 dy = Ship.secty - k->y + ranf(3) - 1;
 100                 bigger = dx;
 101                 if (dy > bigger)
 102                         bigger = dy;
 103                 if (bigger == 0.0)
 104                         bigger = 1.0;
 105                 dx = dx / bigger + 0.5;
 106                 dy = dy / bigger + 0.5;
 107                 if (motion < 0)
 108                 {
 109                         motion = -motion;
 110                         dx = -dx;
 111                         dy = -dy;
 112                 }
 113                 fudgex = fudgey = 1;
 114                 /* try to move the klingon */
 115                 nextx = k->x;
 116                 nexty = k->y;
 117                 for (; motion > 0; motion--)
 118                 {
 119                         lookx = nextx + dx;
 120                         looky = nexty + dy;
 121                         if (lookx < 0 || lookx >= NSECTS || looky < 0 || looky >= NSECTS)
 122                         {
 123                                 /* new quadrant */
 124                                 qx = Ship.quadx;
 125                                 qy = Ship.quady;
 126                                 if (lookx < 0)
 127                                         qx -= 1;
 128                                 else
 129                                         if (lookx >= NSECTS)
 130                                                 qx += 1;
 131                                 if (looky < 0)
 132                                         qy -= 1;
 133                                 else
 134                                         if (looky >= NSECTS)
 135                                                 qy += 1;
 136                                 if (qx < 0 || qx >= NQUADS || qy < 0 || qy >= NQUADS ||
 137                                                 Quad[qx][qy].stars < 0 || Quad[qx][qy].klings > MAXKLQUAD - 1)
 138                                         break;
 139                                 if (!damaged(SRSCAN))
 140                                 {
 141                                         printf("Klingon at %d,%d escapes to quadrant %d,%d\n",
 142                                                 k->x, k->y, qx, qy);
 143                                         motion = Quad[qx][qy].scanned;
 144                                         if (motion >= 0 && motion < 1000)
 145                                                 Quad[qx][qy].scanned += 100;
 146                                         motion = Quad[Ship.quadx][Ship.quady].scanned;
 147                                         if (motion >= 0 && motion < 1000)
 148                                                 Quad[Ship.quadx][Ship.quady].scanned -= 100;
 149                                 }
 150                                 Sect[k->x][k->y] = EMPTY;
 151                                 Quad[qx][qy].klings += 1;
 152                                 Etc.nkling -= 1;
 153                                 *k = Etc.klingon[Etc.nkling];
 154                                 Quad[Ship.quadx][Ship.quady].klings -= 1;
 155                                 k = 0;
 156                                 break;
 157                         }
 158                         if (Sect[lookx][looky] != EMPTY)
 159                         {
 160                                 lookx = nextx + fudgex;
 161                                 if (lookx < 0 || lookx >= NSECTS)
 162                                         lookx = nextx + dx;
 163                                 if (Sect[lookx][looky] != EMPTY)
 164                                 {
 165                                         fudgex = -fudgex;
 166                                         looky = nexty + fudgey;
 167                                         if (looky < 0 || looky >= NSECTS || Sect[lookx][looky] != EMPTY)
 168                                         {
 169                                                 fudgey = -fudgey;
 170                                                 break;
 171                                         }
 172                                 }
 173                         }
 174                         nextx = lookx;
 175                         nexty = looky;
 176                 }
 177                 if (k && (k->x != nextx || k->y != nexty))
 178                 {
 179                         if (!damaged(SRSCAN))
 180                                 printf("Klingon at %d,%d moves to %d,%d\n",
 181                                         k->x, k->y, nextx, nexty);
 182                         Sect[k->x][k->y] = EMPTY;
 183                         Sect[k->x = nextx][k->y = nexty] = KLINGON;
 184                 }
 185         }
 186         compkldist(0);
 187 }