games/hunt/huntd/makemaze.c

   1 /*-
   2  * Copyright (c) 1983-2003, Regents of the University of California.
   3  * 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 are
   7  * met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. Neither the name of the University of California, San Francisco nor
  15  *    the names of its contributors may be used to endorse or promote
  16  *    products derived from this software without specific prior written
  17  *    permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  20  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  22  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  *
  31  * $OpenBSD: makemaze.c,v 1.6 2003/06/11 08:45:33 pjanzen Exp $
  32  * $NetBSD: makemaze.c,v 1.2 1997/10/10 16:33:43 lukem Exp $
  33  * $DragonFly: src/games/hunt/huntd/makemaze.c,v 1.2 2008/09/04 16:12:51 swildner Exp $
  34  */
  35
  36 #include <string.h>
  37
  38 #include "hunt.h"
  39 #include "server.h"
  40 #include "conf.h"
  41
  42 # define        ISCLEAR(y,x)    (Maze[y][x] == SPACE)
  43 # define        ODD(n)          ((n) & 01)
  44
  45 static  void    dig_maze(int, int);
  46 static  void    remap(void);
  47
  48 void
  49 makemaze(void)
  50 {
  51         char    *sp;
  52         int     y, x;
  53
  54         /*
  55          * fill maze with walls
  56          */
  57         sp = &Maze[0][0];
  58         while (sp < &Maze[HEIGHT - 1][WIDTH])
  59                 *sp++ = DOOR;
  60
  61         x = rand_num(WIDTH / 2) * 2 + 1;
  62         y = rand_num(HEIGHT / 2) * 2 + 1;
  63         dig_maze(x, y);
  64         remap();
  65 }
  66
  67 # define        NPERM   24
  68 # define        NDIR    4
  69
  70 int     dirs[NPERM][NDIR] = {
  71                 {0,1,2,3},      {3,0,1,2},      {0,2,3,1},      {0,3,2,1},
  72                 {1,0,2,3},      {2,3,0,1},      {0,2,1,3},      {2,3,1,0},
  73                 {1,0,3,2},      {1,2,0,3},      {3,1,2,0},      {2,0,3,1},
  74                 {1,3,0,2},      {0,3,1,2},      {1,3,2,0},      {2,0,1,3},
  75                 {0,1,3,2},      {3,1,0,2},      {2,1,0,3},      {1,2,3,0},
  76                 {2,1,3,0},      {3,0,2,1},      {3,2,0,1},      {3,2,1,0}
  77         };
  78
  79 int     incr[NDIR][2] = {
  80                 {0, 1}, {1, 0}, {0, -1}, {-1, 0}
  81         };
  82
  83 static void
  84 dig_maze(int x, int y)
  85 {
  86         int     tx, ty;
  87         int     i, j;
  88         int     order[4];
  89 #define MNORTH  0x1
  90 #define MSOUTH  0x2
  91 #define MEAST   0x4
  92 #define MWEST   0x8
  93
  94         tx = ty = 0;
  95         Maze[y][x] = SPACE;
  96         order[0] = MNORTH;
  97         for (i = 1; i < 4; i++) {
  98                 j = rand_num(i + 1);
  99                 order[i] = order[j];
 100                 order[j] = 0x1 << i;
 101         }
 102         for (i = 0; i < 4; i++) {
 103                 switch (order[i]) {
 104                   case MNORTH:
 105                         tx = x;
 106                         ty = y - 2;
 107                         break;
 108                   case MSOUTH:
 109                         tx = x;
 110                         ty = y + 2;
 111                         break;
 112                   case MEAST:
 113                         tx = x + 2;
 114                         ty = y;
 115                         break;
 116                   case MWEST:
 117                         tx = x - 2;
 118                         ty = y;
 119                         break;
 120                 }
 121                 if (tx < 0 || ty < 0 || tx >= WIDTH || ty >= HEIGHT)
 122                         continue;
 123                 if (Maze[ty][tx] == SPACE)
 124                         continue;
 125                 Maze[(y + ty) / 2][(x + tx) / 2] = SPACE;
 126                 dig_maze(tx, ty);
 127         }
 128 }
 129
 130 static void
 131 remap(void)
 132 {
 133         int     y, x;
 134         char    *sp;
 135         int     stat;
 136
 137         for (y = 0; y < HEIGHT; y++)
 138                 for (x = 0; x < WIDTH; x++) {
 139                         sp = &Maze[y][x];
 140                         if (*sp == SPACE)
 141                                 continue;
 142                         /* Find occupied adjacent cells. */
 143                         stat = 0;
 144                         if (y - 1 >= 0 && Maze[y - 1][x] != SPACE)
 145                                 stat |= NORTH;
 146                         if (y + 1 < HEIGHT && Maze[y + 1][x] != SPACE)
 147                                 stat |= SOUTH;
 148                         if (x + 1 < WIDTH && Maze[y][x + 1] != SPACE)
 149                                 stat |= EAST;
 150                         if (x - 1 >= 0 && Maze[y][x - 1] != SPACE)
 151                                 stat |= WEST;
 152                         switch (stat) {
 153                           case WEST | EAST:
 154                           case EAST:
 155                           case WEST:
 156                                 *sp = WALL1;                       /* - */
 157                                 break;
 158                           case NORTH | SOUTH:
 159                           case NORTH:
 160                           case SOUTH:
 161                                 *sp = WALL2;                       /* | */
 162                                 break;
 163                           case 0:
 164                                 if (conf_random)
 165                                         *sp = DOOR;
 166                                 if (conf_reflect)
 167                                         *sp = rand_num(2) ? WALL4 : WALL5;
 168                                 break;
 169                           default:
 170                                 *sp = WALL3;                       /* + */
 171                                 break;
 172                         }
 173                 }
 174         memcpy(Orig_maze, Maze, sizeof Orig_maze);
 175 }