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1 | |
| 1 | /* peterm@langmuir.eecs.berkeley.edu: this function generates a random |
2 | /* peterm@langmuir.eecs.berkeley.edu: this function generates a random |
| 2 | blocked maze with the property that there is only one path from one spot |
3 | blocked maze with the property that there is only one path from one spot |
| 3 | to any other, and there is always a path from one spot to any other. |
4 | to any other, and there is always a path from one spot to any other. |
| 4 | |
5 | |
| 5 | input: xsize, ysize; |
6 | input: xsize, ysize; |
| … | |
… | |
| 12 | |
13 | |
| 13 | /* we need to maintain a list of wall points to generate |
14 | /* we need to maintain a list of wall points to generate |
| 14 | reasonable mazes: a straightforward recursive random walk maze |
15 | reasonable mazes: a straightforward recursive random walk maze |
| 15 | generator would generate a map with a trivial circle-the-outer-wall solution */ |
16 | generator would generate a map with a trivial circle-the-outer-wall solution */ |
| 16 | |
17 | |
| 17 | #include <stdio.h> |
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| 18 | #include <global.h> |
18 | #include <global.h> |
| 19 | |
19 | |
| 20 | /*#include <random_map.h>*/ |
20 | #include "random_map.h" |
| 21 | #include <maze_gen.h> |
21 | #include "rproto.h" |
| 22 | #include <time.h> |
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| 23 | |
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| 24 | |
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| 25 | /* this include solely, and only, is needed for the definition of RANDOM */ |
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| 26 | |
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| 27 | |
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| 28 | |
22 | |
| 29 | /* global variables that everyone needs: don't want to pass them in |
23 | /* global variables that everyone needs: don't want to pass them in |
| 30 | as parameters every time. */ |
24 | as parameters every time. */ |
| 31 | int *wall_x_list = 0; |
25 | int *wall_x_list = 0; |
| 32 | int *wall_y_list = 0; |
26 | int *wall_y_list = 0; |
| … | |
… | |
| 35 | /* heuristically, we need to change wall_chance based on the size of |
29 | /* heuristically, we need to change wall_chance based on the size of |
| 36 | the maze. */ |
30 | the maze. */ |
| 37 | |
31 | |
| 38 | int wall_chance; |
32 | int wall_chance; |
| 39 | |
33 | |
| 40 | /* the outsize interface routine: accepts sizes, returns a char |
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| 41 | ** maze. option is a flag for either a sparse or a full maze. Sparse |
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| 42 | mazes have sizable rooms. option = 1, full, 0, sparse.*/ |
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| 43 | |
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| 44 | char ** |
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| 45 | maze_gen (int xsize, int ysize, int option) |
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| 46 | { |
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| 47 | int i, j; |
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| 48 | |
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| 49 | /* allocate that array, set it up */ |
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| 50 | char **maze = (char **) calloc (sizeof (char *), xsize); |
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| 51 | |
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| 52 | for (i = 0; i < xsize; i++) |
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| 53 | { |
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| 54 | maze[i] = (char *) calloc (sizeof (char), ysize); |
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| 55 | } |
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| 56 | |
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| 57 | /* write the outer walls */ |
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| 58 | for (i = 0; i < xsize; i++) |
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| 59 | maze[i][0] = maze[i][ysize - 1] = '#'; |
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| 60 | for (j = 0; j < ysize; j++) |
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| 61 | maze[0][j] = maze[xsize - 1][j] = '#'; |
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| 62 | |
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| 63 | |
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| 64 | /* find how many free wall spots there are */ |
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| 65 | wall_free_size = 2 * (xsize - 4) + 2 * (ysize - 4); |
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| 66 | |
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| 67 | make_wall_free_list (xsize, ysize); |
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| 68 | |
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| 69 | /* return the empty maze */ |
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| 70 | if (wall_free_size <= 0) |
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| 71 | return maze; |
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| 72 | |
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| 73 | /* recursively generate the walls of the maze */ |
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| 74 | /* first pop a random starting point */ |
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| 75 | while (wall_free_size > 0) |
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| 76 | { |
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| 77 | pop_wall_point (&i, &j); |
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| 78 | if (option) |
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| 79 | fill_maze_full (maze, i, j, xsize, ysize); |
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| 80 | else |
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| 81 | fill_maze_sparse (maze, i, j, xsize, ysize); |
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| 82 | } |
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| 83 | |
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| 84 | /* clean up our intermediate data structures. */ |
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| 85 | |
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| 86 | free (wall_x_list); |
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| 87 | free (wall_y_list); |
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| 88 | |
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| 89 | return maze; |
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| 90 | } |
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| 91 | |
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| 92 | |
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| 93 | |
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| 94 | /* the free wall points are those outer points which aren't corners or |
34 | /* the free wall points are those outer points which aren't corners or |
| 95 | near corners, and don't have a maze wall growing out of them already. */ |
35 | near corners, and don't have a maze wall growing out of them already. */ |
| 96 | |
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| 97 | void |
36 | void |
| 98 | make_wall_free_list (int xsize, int ysize) |
37 | make_wall_free_list (int xsize, int ysize) |
| 99 | { |
38 | { |
| 100 | int i, j, count; |
39 | int i, j, count; |
| 101 | |
40 | |
| 102 | count = 0; /* entries already placed in the free list */ |
41 | count = 0; /* entries already placed in the free list */ |
| 103 | /*allocate it */ |
42 | /*allocate it */ |
| 104 | if (wall_free_size < 0) |
43 | if (wall_free_size < 0) |
| 105 | return; |
44 | return; |
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45 | |
| 106 | wall_x_list = (int *) calloc (sizeof (int), wall_free_size); |
46 | wall_x_list = (int *)calloc (sizeof (int), wall_free_size); |
| 107 | wall_y_list = (int *) calloc (sizeof (int), wall_free_size); |
47 | wall_y_list = (int *)calloc (sizeof (int), wall_free_size); |
| 108 | |
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| 109 | |
48 | |
| 110 | /* top and bottom wall */ |
49 | /* top and bottom wall */ |
| 111 | for (i = 2; i < xsize - 2; i++) |
50 | for (i = 2; i < xsize - 2; i++) |
| 112 | { |
51 | { |
| 113 | wall_x_list[count] = i; |
52 | wall_x_list[count] = i; |
| … | |
… | |
| 128 | wall_y_list[count] = j; |
67 | wall_y_list[count] = j; |
| 129 | count++; |
68 | count++; |
| 130 | } |
69 | } |
| 131 | } |
70 | } |
| 132 | |
71 | |
| 133 | |
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| 134 | |
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| 135 | /* randomly returns one of the elements from the wall point list */ |
72 | /* randomly returns one of the elements from the wall point list */ |
| 136 | |
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| 137 | void |
73 | void |
| 138 | pop_wall_point (int *x, int *y) |
74 | pop_wall_point (int *x, int *y) |
| 139 | { |
75 | { |
| 140 | int index = RANDOM () % wall_free_size; |
76 | int index = rmg_rndm (wall_free_size); |
| 141 | |
77 | |
| 142 | *x = wall_x_list[index]; |
78 | *x = wall_x_list[index]; |
| 143 | *y = wall_y_list[index]; |
79 | *y = wall_y_list[index]; |
| 144 | /* write the last array point here */ |
80 | /* write the last array point here */ |
| 145 | wall_x_list[index] = wall_x_list[wall_free_size - 1]; |
81 | wall_x_list[index] = wall_x_list[wall_free_size - 1]; |
| 146 | wall_y_list[index] = wall_y_list[wall_free_size - 1]; |
82 | wall_y_list[index] = wall_y_list[wall_free_size - 1]; |
| 147 | wall_free_size--; |
83 | wall_free_size--; |
| 148 | } |
84 | } |
| 149 | |
85 | |
| 150 | |
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| 151 | |
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| 152 | /* find free point: randomly look for a square adjacent to this one where |
86 | /* find free point: randomly look for a square adjacent to this one where |
| 153 | we can place a new block without closing a path. We may only look |
87 | we can place a new block without closing a path. We may only look |
| 154 | up, down, right, or left. */ |
88 | up, down, right, or left. */ |
| 155 | |
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| 156 | int |
89 | int |
| 157 | find_free_point (char **maze, int *x, int *y, int xc, int yc, int xsize, int ysize) |
90 | find_free_point (char **maze, int *x, int *y, int xc, int yc, int xsize, int ysize) |
| 158 | { |
91 | { |
| 159 | |
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| 160 | /* we will randomly pick from this list, 1=up,2=down,3=right,4=left */ |
92 | /* we will randomly pick from this list, 1=up,2=down,3=right,4=left */ |
| 161 | int dirlist[4]; |
93 | int dirlist[4]; |
| 162 | int count = 0; /* # elements in dirlist */ |
94 | int count = 0; /* # elements in dirlist */ |
| 163 | |
95 | |
| 164 | /* look up */ |
96 | /* look up */ |
| 165 | if (yc < ysize - 2 && xc > 2 && xc < xsize - 2) /* it is valid to look up */ |
97 | if (yc < ysize - 2 && xc > 2 && xc < xsize - 2) /* it is valid to look up */ |
| … | |
… | |
| 167 | int cleartest = (int) maze[xc][yc + 1] + (int) maze[xc - 1][yc + 1] + (int) maze[xc + 1][yc + 1]; |
99 | int cleartest = (int) maze[xc][yc + 1] + (int) maze[xc - 1][yc + 1] + (int) maze[xc + 1][yc + 1]; |
| 168 | |
100 | |
| 169 | cleartest += (int) maze[xc][yc + 2] + (int) maze[xc - 1][yc + 2] + (int) maze[xc + 1][yc + 2]; |
101 | cleartest += (int) maze[xc][yc + 2] + (int) maze[xc - 1][yc + 2] + (int) maze[xc + 1][yc + 2]; |
| 170 | |
102 | |
| 171 | if (cleartest == 0) |
103 | if (cleartest == 0) |
| 172 | { |
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| 173 | dirlist[count] = 1; |
104 | dirlist[count++] = 1; |
| 174 | count++; |
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| 175 | } |
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| 176 | } |
105 | } |
| 177 | |
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| 178 | |
106 | |
| 179 | /* look down */ |
107 | /* look down */ |
| 180 | if (yc > 2 && xc > 2 && xc < xsize - 2) /* it is valid to look down */ |
108 | if (yc > 2 && xc > 2 && xc < xsize - 2) /* it is valid to look down */ |
| 181 | { |
109 | { |
| 182 | int cleartest = (int) maze[xc][yc - 1] + (int) maze[xc - 1][yc - 1] + (int) maze[xc + 1][yc - 1]; |
110 | int cleartest = (int) maze[xc][yc - 1] + (int) maze[xc - 1][yc - 1] + (int) maze[xc + 1][yc - 1]; |
| 183 | |
111 | |
| 184 | cleartest += (int) maze[xc][yc - 2] + (int) maze[xc - 1][yc - 2] + (int) maze[xc + 1][yc - 2]; |
112 | cleartest += (int) maze[xc][yc - 2] + (int) maze[xc - 1][yc - 2] + (int) maze[xc + 1][yc - 2]; |
| 185 | |
113 | |
| 186 | if (cleartest == 0) |
114 | if (cleartest == 0) |
| 187 | { |
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| 188 | dirlist[count] = 2; |
115 | dirlist[count++] = 2; |
| 189 | count++; |
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| 190 | } |
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| 191 | } |
116 | } |
| 192 | |
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| 193 | |
117 | |
| 194 | /* look right */ |
118 | /* look right */ |
| 195 | if (xc < xsize - 2 && yc > 2 && yc < ysize - 2) /* it is valid to look left */ |
119 | if (xc < xsize - 2 && yc > 2 && yc < ysize - 2) /* it is valid to look left */ |
| 196 | { |
120 | { |
| 197 | int cleartest = (int) maze[xc + 1][yc] + (int) maze[xc + 1][yc - 1] + (int) maze[xc + 1][yc + 1]; |
121 | int cleartest = (int) maze[xc + 1][yc] + (int) maze[xc + 1][yc - 1] + (int) maze[xc + 1][yc + 1]; |
| 198 | |
122 | |
| 199 | cleartest += (int) maze[xc + 2][yc] + (int) maze[xc + 2][yc - 1] + (int) maze[xc + 2][yc + 1]; |
123 | cleartest += (int) maze[xc + 2][yc] + (int) maze[xc + 2][yc - 1] + (int) maze[xc + 2][yc + 1]; |
| 200 | |
124 | |
| 201 | if (cleartest == 0) |
125 | if (cleartest == 0) |
| 202 | { |
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| 203 | dirlist[count] = 3; |
126 | dirlist[count++] = 3; |
| 204 | count++; |
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| 205 | } |
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| 206 | } |
127 | } |
| 207 | |
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| 208 | |
128 | |
| 209 | /* look left */ |
129 | /* look left */ |
| 210 | if (xc > 2 && yc > 2 && yc < ysize - 2) /* it is valid to look down */ |
130 | if (xc > 2 && yc > 2 && yc < ysize - 2) /* it is valid to look down */ |
| 211 | { |
131 | { |
| 212 | int cleartest = (int) maze[xc - 1][yc] + (int) maze[xc - 1][yc - 1] + (int) maze[xc - 1][yc + 1]; |
132 | int cleartest = (int) maze[xc - 1][yc] + (int) maze[xc - 1][yc - 1] + (int) maze[xc - 1][yc + 1]; |
| 213 | |
133 | |
| 214 | cleartest += (int) maze[xc - 2][yc] + (int) maze[xc - 2][yc - 1] + (int) maze[xc - 2][yc + 1]; |
134 | cleartest += (int) maze[xc - 2][yc] + (int) maze[xc - 2][yc - 1] + (int) maze[xc - 2][yc + 1]; |
| 215 | |
135 | |
| 216 | if (cleartest == 0) |
136 | if (cleartest == 0) |
| 217 | { |
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| 218 | dirlist[count] = 4; |
137 | dirlist[count++] = 4; |
| 219 | count++; |
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| 220 | } |
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| 221 | } |
138 | } |
| 222 | |
139 | |
| 223 | if (count == 0) |
140 | if (count == 0) |
| 224 | return -1; /* failed to find any clear points */ |
141 | return -1; /* failed to find any clear points */ |
| 225 | |
142 | |
| 226 | /* choose a random direction */ |
143 | /* choose a random direction */ |
| 227 | if (count > 1) |
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| 228 | count = RANDOM () % count; |
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| 229 | else |
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| 230 | count = 0; |
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| 231 | switch (dirlist[count]) |
144 | switch (dirlist [rmg_rndm (count)]) |
| 232 | { |
145 | { |
| 233 | case 1: /* up */ |
146 | case 1: /* up */ |
| 234 | { |
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| 235 | *y = yc + 1; |
147 | *y = yc + 1; |
| 236 | *x = xc; |
148 | *x = xc; |
| 237 | break; |
149 | break; |
| 238 | }; |
150 | |
| 239 | case 2: /* down */ |
151 | case 2: /* down */ |
| 240 | { |
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| 241 | *y = yc - 1; |
152 | *y = yc - 1; |
| 242 | *x = xc; |
153 | *x = xc; |
| 243 | break; |
154 | break; |
| 244 | }; |
155 | |
| 245 | case 3: /* right */ |
156 | case 3: /* right */ |
| 246 | { |
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| 247 | *y = yc; |
157 | *y = yc; |
| 248 | *x = xc + 1; |
158 | *x = xc + 1; |
| 249 | break; |
159 | break; |
| 250 | } |
160 | |
| 251 | case 4: /* left */ |
161 | case 4: /* left */ |
| 252 | { |
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| 253 | *x = xc - 1; |
162 | *x = xc - 1; |
| 254 | *y = yc; |
163 | *y = yc; |
| 255 | break; |
164 | break; |
| 256 | } |
165 | |
| 257 | default: /* ??? */ |
166 | default: /* ??? */ |
| 258 | { |
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| 259 | return -1; |
167 | return -1; |
| 260 | } |
168 | |
| 261 | } |
169 | } |
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170 | |
| 262 | return 1; |
171 | return 1; |
| 263 | } |
172 | } |
| 264 | |
173 | |
| 265 | /* recursive routine which will fill every available space in the maze |
174 | /* recursive routine which will fill every available space in the maze |
| 266 | with walls*/ |
175 | with walls*/ |
| 267 | |
176 | static void |
| 268 | void |
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| 269 | fill_maze_full (char **maze, int x, int y, int xsize, int ysize) |
177 | fill_maze_full (char **maze, int x, int y, int xsize, int ysize) |
| 270 | { |
178 | { |
| 271 | int xc, yc; |
179 | int xc, yc; |
| 272 | |
180 | |
| 273 | /* write a wall here */ |
181 | /* write a wall here */ |
| 274 | maze[x][y] = '#'; |
182 | maze[x][y] = '#'; |
| 275 | |
183 | |
| 276 | /* decide if we're going to pick from the wall_free_list */ |
184 | /* decide if we're going to pick from the wall_free_list */ |
| 277 | if (RANDOM () % 4 && wall_free_size > 0) |
185 | if (rmg_rndm (4) && wall_free_size > 0) |
| 278 | { |
186 | { |
| 279 | pop_wall_point (&xc, &yc); |
187 | pop_wall_point (&xc, &yc); |
| 280 | fill_maze_full (maze, xc, yc, xsize, ysize); |
188 | fill_maze_full (maze, xc, yc, xsize, ysize); |
| 281 | } |
189 | } |
| 282 | |
190 | |
| 283 | /* change the if to a while for a complete maze. */ |
191 | /* change the if to a while for a complete maze. */ |
| 284 | while (find_free_point (maze, &xc, &yc, x, y, xsize, ysize) != -1) |
192 | while (find_free_point (maze, &xc, &yc, x, y, xsize, ysize) != -1) |
| 285 | { |
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| 286 | fill_maze_full (maze, xc, yc, xsize, ysize); |
193 | fill_maze_full (maze, xc, yc, xsize, ysize); |
| 287 | } |
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| 288 | } |
194 | } |
| 289 | |
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| 290 | |
195 | |
| 291 | /* recursive routine which will fill much of the maze, but will leave |
196 | /* recursive routine which will fill much of the maze, but will leave |
| 292 | some free spots (possibly large) toward the center.*/ |
197 | some free spots (possibly large) toward the center.*/ |
| 293 | |
198 | static void |
| 294 | void |
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| 295 | fill_maze_sparse (char **maze, int x, int y, int xsize, int ysize) |
199 | fill_maze_sparse (char **maze, int x, int y, int xsize, int ysize) |
| 296 | { |
200 | { |
| 297 | int xc, yc; |
201 | int xc, yc; |
| 298 | |
202 | |
| 299 | /* write a wall here */ |
203 | /* write a wall here */ |
| 300 | maze[x][y] = '#'; |
204 | maze[x][y] = '#'; |
| 301 | |
205 | |
| 302 | /* decide if we're going to pick from the wall_free_list */ |
206 | /* decide if we're going to pick from the wall_free_list */ |
| 303 | if (RANDOM () % 4 && wall_free_size > 0) |
207 | if (rmg_rndm (4) && wall_free_size > 0) |
| 304 | { |
208 | { |
| 305 | pop_wall_point (&xc, &yc); |
209 | pop_wall_point (&xc, &yc); |
| 306 | fill_maze_sparse (maze, xc, yc, xsize, ysize); |
210 | fill_maze_sparse (maze, xc, yc, xsize, ysize); |
| 307 | } |
211 | } |
| 308 | |
212 | |
| 309 | /* change the if to a while for a complete maze. */ |
213 | /* change the if to a while for a complete maze. */ |
| 310 | if (find_free_point (maze, &xc, &yc, x, y, xsize, ysize) != -1) |
214 | if (find_free_point (maze, &xc, &yc, x, y, xsize, ysize) != -1) |
| 311 | { |
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| 312 | fill_maze_sparse (maze, xc, yc, xsize, ysize); |
215 | fill_maze_sparse (maze, xc, yc, xsize, ysize); |
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216 | } |
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217 | |
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218 | /* the outsize interface routine: accepts sizes, returns a char |
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219 | ** maze. option is a flag for either a sparse or a full maze. Sparse |
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220 | mazes have sizable rooms. option = 1, full, 0, sparse.*/ |
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221 | void |
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222 | maze_gen (Layout maze, int option) |
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223 | { |
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224 | maze->clear (); |
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225 | maze->border (); |
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226 | |
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227 | /* find how many free wall spots there are */ |
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228 | wall_free_size = 2 * (maze->w - 4) + 2 * (maze->h - 4); |
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229 | |
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230 | make_wall_free_list (maze->w, maze->h); |
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231 | |
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232 | /* return the empty maze */ |
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233 | if (wall_free_size <= 0) |
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234 | return; |
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235 | |
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236 | /* recursively generate the walls of the maze */ |
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237 | /* first pop a random starting point */ |
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238 | while (wall_free_size > 0) |
| 313 | } |
239 | { |
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240 | int i, j; |
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241 | |
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242 | pop_wall_point (&i, &j); |
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243 | |
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244 | if (option) |
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245 | fill_maze_full (maze, i, j, maze->w, maze->h); |
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246 | else |
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247 | fill_maze_sparse (maze, i, j, maze->w, maze->h); |
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248 | } |
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249 | |
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250 | /* clean up our intermediate data structures. */ |
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251 | |
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252 | free (wall_x_list); |
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253 | free (wall_y_list); |
| 314 | } |
254 | } |
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255 | |
