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1.1 root 1: /*
2: * Hunt
3: * Copyright (c) 1985 Conrad C. Huang, Gregory S. Couch, Kenneth C.R.C. Arnold
4: * San Francisco, California
5: *
6: * Copyright (c) 1985 Regents of the University of California.
7: * All rights reserved. The Berkeley software License Agreement
8: * specifies the terms and conditions for redistribution.
9: */
10:
11: # include "hunt.h"
12:
13: # define ISCLEAR(y,x) (Maze[y][x] == SPACE)
14: # define ODD(n) ((n) & 01)
15:
16: makemaze()
17: {
18: register char *sp;
19: register int y, x;
20:
21: /*
22: * fill maze with walls
23: */
24: sp = &Maze[0][0];
25: while (sp < &Maze[HEIGHT - 1][WIDTH])
26: *sp++ = DOOR;
27:
28: y = rand_num(DBOUND - UBOUND) + UBOUND;
29: x = rand_num(RBOUND - LBOUND) + LBOUND;
30: dig(y, x); /* Dig out the maze */
31: remap();
32: }
33:
34: # define NPERM 24
35: # define NDIR 4
36:
37: int dirs[NPERM][NDIR] = {
38: {0,1,2,3}, {3,0,1,2}, {0,2,3,1}, {0,3,2,1},
39: {1,0,2,3}, {2,3,0,1}, {0,2,1,3}, {2,3,1,0},
40: {1,0,3,2}, {1,2,0,3}, {3,1,2,0}, {2,0,3,1},
41: {1,3,0,2}, {0,3,1,2}, {1,3,2,0}, {2,0,1,3},
42: {0,1,3,2}, {3,1,0,2}, {2,1,0,3}, {1,2,3,0},
43: {2,1,3,0}, {3,0,2,1}, {3,2,0,1}, {3,2,1,0}
44: };
45:
46: int incr[NDIR][2] = {
47: {0, 1}, {1, 0}, {0, -1}, {-1, 0}
48: };
49:
50: dig(y, x)
51: int y, x;
52: {
53: register int *dp;
54: register int *ip;
55: register int ny, nx;
56: register int *endp;
57:
58: Maze[y][x] = SPACE; /* Clear this spot */
59: dp = dirs[rand_num(NPERM)];
60: endp = &dp[NDIR];
61: while (dp < endp) {
62: ip = &incr[*dp++][0];
63: ny = y + *ip++;
64: nx = x + *ip;
65: if (candig(ny, nx))
66: dig(ny, nx);
67: }
68: }
69:
70: /*
71: * candig:
72: * Is it legal to clear this spot?
73: */
74: candig(y, x)
75: register int y, x;
76: {
77: register int i;
78:
79: if (ODD(x) && ODD(y))
80: return FALSE; /* can't touch ODD spots */
81:
82: if (y < UBOUND || y >= DBOUND)
83: return FALSE; /* Beyond vertical bounds, NO */
84: if (x < LBOUND || x >= RBOUND)
85: return FALSE; /* Beyond horizontal bounds, NO */
86:
87: if (ISCLEAR(y, x))
88: return FALSE; /* Already clear, NO */
89:
90: i = ISCLEAR(y, x + 1);
91: i += ISCLEAR(y, x - 1);
92: if (i > 1)
93: return FALSE; /* Introduces cycle, NO */
94: i += ISCLEAR(y + 1, x);
95: if (i > 1)
96: return FALSE; /* Introduces cycle, NO */
97: i += ISCLEAR(y - 1, x);
98: if (i > 1)
99: return FALSE; /* Introduces cycle, NO */
100:
101: return TRUE; /* OK */
102: }
103:
104: remap()
105: {
106: register int y, x;
107: register char *sp;
108: register int stat;
109:
110: for (y = 0; y < HEIGHT; y++)
111: for (x = 0; x < WIDTH; x++) {
112: sp = &Maze[y][x];
113: if (*sp == SPACE)
114: continue;
115: stat = 0;
116: if (y - 1 >= 0 && Maze[y - 1][x] != SPACE)
117: stat |= NORTH;
118: if (y + 1 < HEIGHT && Maze[y + 1][x] != SPACE)
119: stat |= SOUTH;
120: if (x + 1 < WIDTH && Maze[y][x + 1] != SPACE)
121: stat |= EAST;
122: if (x - 1 >= 0 && Maze[y][x - 1] != SPACE)
123: stat |= WEST;
124: switch (stat) {
125: case WEST | EAST:
126: *sp = WALL1;
127: break;
128: case NORTH | SOUTH:
129: *sp = WALL2;
130: break;
131: case 0:
132: # ifdef RANDOM
133: *sp = DOOR;
134: # endif RANDOM
135: # ifdef REFLECT
136: *sp = rand_num(2) ? WALL4 : WALL5;
137: # endif REFLECT
138: break;
139: default:
140: *sp = WALL3;
141: break;
142: }
143: }
144: bcopy((char *) Maze, (char *) Orig_maze, sizeof Maze);
145: }
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