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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; |
| … | |
… | |
| 18 | #include <global.h> |
19 | #include <global.h> |
| 19 | |
20 | |
| 20 | /*#include <random_map.h>*/ |
21 | /*#include <random_map.h>*/ |
| 21 | #include <maze_gen.h> |
22 | #include <maze_gen.h> |
| 22 | #include <time.h> |
23 | #include <time.h> |
| 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 | |
24 | |
| 29 | /* global variables that everyone needs: don't want to pass them in |
25 | /* global variables that everyone needs: don't want to pass them in |
| 30 | as parameters every time. */ |
26 | as parameters every time. */ |
| 31 | int *wall_x_list = 0; |
27 | int *wall_x_list = 0; |
| 32 | int *wall_y_list = 0; |
28 | int *wall_y_list = 0; |
| … | |
… | |
| 135 | /* randomly returns one of the elements from the wall point list */ |
131 | /* randomly returns one of the elements from the wall point list */ |
| 136 | |
132 | |
| 137 | void |
133 | void |
| 138 | pop_wall_point (int *x, int *y) |
134 | pop_wall_point (int *x, int *y) |
| 139 | { |
135 | { |
| 140 | int index = RANDOM () % wall_free_size; |
136 | int index = rndm (wall_free_size); |
| 141 | |
137 | |
| 142 | *x = wall_x_list[index]; |
138 | *x = wall_x_list[index]; |
| 143 | *y = wall_y_list[index]; |
139 | *y = wall_y_list[index]; |
| 144 | /* write the last array point here */ |
140 | /* write the last array point here */ |
| 145 | wall_x_list[index] = wall_x_list[wall_free_size - 1]; |
141 | wall_x_list[index] = wall_x_list[wall_free_size - 1]; |
| … | |
… | |
| 223 | if (count == 0) |
219 | if (count == 0) |
| 224 | return -1; /* failed to find any clear points */ |
220 | return -1; /* failed to find any clear points */ |
| 225 | |
221 | |
| 226 | /* choose a random direction */ |
222 | /* choose a random direction */ |
| 227 | if (count > 1) |
223 | if (count > 1) |
| 228 | count = RANDOM () % count; |
224 | count = rndm (count); |
| 229 | else |
225 | else |
| 230 | count = 0; |
226 | count = 0; |
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227 | |
| 231 | switch (dirlist[count]) |
228 | switch (dirlist[count]) |
| 232 | { |
229 | { |
| 233 | case 1: /* up */ |
230 | case 1: /* up */ |
| 234 | { |
231 | { |
| 235 | *y = yc + 1; |
232 | *y = yc + 1; |
| 236 | *x = xc; |
233 | *x = xc; |
| 237 | break; |
234 | break; |
| 238 | }; |
235 | }; |
| 239 | case 2: /* down */ |
236 | case 2: /* down */ |
| 240 | { |
237 | { |
| 241 | *y = yc - 1; |
238 | *y = yc - 1; |
| 242 | *x = xc; |
239 | *x = xc; |
| 243 | break; |
240 | break; |
| 244 | }; |
241 | }; |
| 245 | case 3: /* right */ |
242 | case 3: /* right */ |
| 246 | { |
243 | { |
| 247 | *y = yc; |
244 | *y = yc; |
| 248 | *x = xc + 1; |
245 | *x = xc + 1; |
| 249 | break; |
246 | break; |
| 250 | } |
247 | } |
| 251 | case 4: /* left */ |
248 | case 4: /* left */ |
| 252 | { |
249 | { |
| 253 | *x = xc - 1; |
250 | *x = xc - 1; |
| 254 | *y = yc; |
251 | *y = yc; |
| 255 | break; |
252 | break; |
| 256 | } |
253 | } |
| 257 | default: /* ??? */ |
254 | default: /* ??? */ |
| 258 | { |
255 | { |
| 259 | return -1; |
256 | return -1; |
| 260 | } |
257 | } |
| 261 | } |
258 | } |
| 262 | return 1; |
259 | return 1; |
| 263 | } |
260 | } |
| 264 | |
261 | |
| 265 | /* recursive routine which will fill every available space in the maze |
262 | /* recursive routine which will fill every available space in the maze |
| … | |
… | |
| 272 | |
269 | |
| 273 | /* write a wall here */ |
270 | /* write a wall here */ |
| 274 | maze[x][y] = '#'; |
271 | maze[x][y] = '#'; |
| 275 | |
272 | |
| 276 | /* decide if we're going to pick from the wall_free_list */ |
273 | /* decide if we're going to pick from the wall_free_list */ |
| 277 | if (RANDOM () % 4 && wall_free_size > 0) |
274 | if (rndm (4) && wall_free_size > 0) |
| 278 | { |
275 | { |
| 279 | pop_wall_point (&xc, &yc); |
276 | pop_wall_point (&xc, &yc); |
| 280 | fill_maze_full (maze, xc, yc, xsize, ysize); |
277 | fill_maze_full (maze, xc, yc, xsize, ysize); |
| 281 | } |
278 | } |
| 282 | |
279 | |
| … | |
… | |
| 298 | |
295 | |
| 299 | /* write a wall here */ |
296 | /* write a wall here */ |
| 300 | maze[x][y] = '#'; |
297 | maze[x][y] = '#'; |
| 301 | |
298 | |
| 302 | /* decide if we're going to pick from the wall_free_list */ |
299 | /* decide if we're going to pick from the wall_free_list */ |
| 303 | if (RANDOM () % 4 && wall_free_size > 0) |
300 | if (rndm (4) && wall_free_size > 0) |
| 304 | { |
301 | { |
| 305 | pop_wall_point (&xc, &yc); |
302 | pop_wall_point (&xc, &yc); |
| 306 | fill_maze_sparse (maze, xc, yc, xsize, ysize); |
303 | fill_maze_sparse (maze, xc, yc, xsize, ysize); |
| 307 | } |
304 | } |
| 308 | |
305 | |
