games/trek/klmove.c

   1 /*      $NetBSD: klmove.c,v 1.8 2009/05/24 21:44:56 dholland 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 1.8 2009/05/24 21:44:56 dholland 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(int fl)
  69 {
  70         int                     n;
  71         struct kling    *k;
  72         double                  dx, dy;
  73         int                     nextx, nexty;
  74         int             lookx, looky;
  75         int                     motion;
  76         int                     fudgex, fudgey;
  77         int                     qx, qy;
  78         double                  bigger;
  79         int                     i;
  80
  81 #ifdef xTRACE
  82         if (Trace)
  83                 printf("klmove: fl = %d, Etc.nkling = %d\n", fl, Etc.nkling);
  84 #endif
  85         for (n = 0; n < Etc.nkling; n++) {
  86                 k = &Etc.klingon[n];
  87                 i = 100;
  88                 if (fl)
  89                         i = 100.0 * k->power / Param.klingpwr;
  90                 if (ranf(i) >= Param.moveprob[2 * Move.newquad + fl])
  91                         continue;
  92                 /* compute distance to move */
  93                 motion = ranf(75) - 25;
  94                 motion *= k->avgdist * Param.movefac[2 * Move.newquad + fl];
  95                 /* compute direction */
  96                 dx = Ship.sectx - k->x + ranf(3) - 1;
  97                 dy = Ship.secty - k->y + ranf(3) - 1;
  98                 bigger = dx;
  99                 if (dy > bigger)
 100                         bigger = dy;
 101                 if (bigger == 0.0)
 102                         bigger = 1.0;
 103                 dx = dx / bigger + 0.5;
 104                 dy = dy / bigger + 0.5;
 105                 if (motion < 0) {
 106                         motion = -motion;
 107                         dx = -dx;
 108                         dy = -dy;
 109                 }
 110                 fudgex = fudgey = 1;
 111                 /* try to move the klingon */
 112                 nextx = k->x;
 113                 nexty = k->y;
 114                 for (; motion > 0; motion--) {
 115                         lookx = nextx + dx;
 116                         looky = nexty + dy;
 117                         if (lookx < 0 || lookx >= NSECTS ||
 118                             looky < 0 || looky >= NSECTS) {
 119                                 /* new quadrant */
 120                                 qx = Ship.quadx;
 121                                 qy = Ship.quady;
 122                                 if (lookx < 0)
 123                                         qx -= 1;
 124                                 else
 125                                         if (lookx >= NSECTS)
 126                                                 qx += 1;
 127                                 if (looky < 0)
 128                                         qy -= 1;
 129                                 else
 130                                         if (looky >= NSECTS)
 131                                                 qy += 1;
 132                                 if (qx < 0 || qx >= NQUADS ||
 133                                     qy < 0 || qy >= NQUADS ||
 134                                     Quad[qx][qy].stars < 0 ||
 135                                     Quad[qx][qy].klings > MAXKLQUAD - 1)
 136                                         break;
 137                                 if (!damaged(SRSCAN)) {
 138                                         printf("Klingon at %d,%d escapes to "
 139                                                "quadrant %d,%d\n",
 140                                                 k->x, k->y, qx, qy);
 141                                         motion = Quad[qx][qy].scanned;
 142                                         if (motion >= 0 && motion < 1000)
 143                                                 Quad[qx][qy].scanned += 100;
 144                                         motion = Quad[Ship.quadx][Ship.quady]
 145                                                 .scanned;
 146                                         if (motion >= 0 && motion < 1000)
 147                                                 Quad[Ship.quadx][Ship.quady]
 148                                                         .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                                 lookx = nextx + fudgex;
 160                                 if (lookx < 0 || lookx >= NSECTS)
 161                                         lookx = nextx + dx;
 162                                 if (Sect[lookx][looky] != EMPTY) {
 163                                         fudgex = -fudgex;
 164                                         looky = nexty + fudgey;
 165                                         if (looky < 0 || looky >= NSECTS ||
 166                                             Sect[lookx][looky] != EMPTY) {
 167                                                 fudgey = -fudgey;
 168                                                 break;
 169                                         }
 170                                 }
 171                         }
 172                         nextx = lookx;
 173                         nexty = looky;
 174                 }
 175                 if (k && (k->x != nextx || k->y != nexty)) {
 176                         if (!damaged(SRSCAN))
 177                                 printf("Klingon at %d,%d moves to %d,%d\n",
 178                                         k->x, k->y, nextx, nexty);
 179                         Sect[k->x][k->y] = EMPTY;
 180                         Sect[k->x = nextx][k->y = nexty] = KLINGON;
 181                 }
 182         }
 183         compkldist(0);
 184 }