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