| … | |
… | |
| 20 | #include "random_map.h" |
20 | #include "random_map.h" |
| 21 | #include "rproto.h" |
21 | #include "rproto.h" |
| 22 | |
22 | |
| 23 | /* 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 |
| 24 | as parameters every time. */ |
24 | as parameters every time. */ |
| 25 | int *wall_x_list = 0; |
25 | static int *wall_x_list = 0; |
| 26 | int *wall_y_list = 0; |
26 | static int *wall_y_list = 0; |
| 27 | int wall_free_size = 0; |
27 | static int wall_free_size = 0; |
| 28 | |
28 | |
| 29 | /* 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 |
| 30 | the maze. */ |
30 | the maze. */ |
| 31 | |
31 | |
| 32 | int wall_chance; |
32 | static int wall_chance; |
| 33 | |
|
|
| 34 | /* the outsize interface routine: accepts sizes, returns a char |
|
|
| 35 | ** maze. option is a flag for either a sparse or a full maze. Sparse |
|
|
| 36 | mazes have sizable rooms. option = 1, full, 0, sparse.*/ |
|
|
| 37 | |
|
|
| 38 | Maze |
|
|
| 39 | maze_gen (int xsize, int ysize, int option) |
|
|
| 40 | { |
|
|
| 41 | int i, j; |
|
|
| 42 | |
|
|
| 43 | Maze maze (xsize, ysize); |
|
|
| 44 | |
|
|
| 45 | /* write the outer walls */ |
|
|
| 46 | for (i = 0; i < xsize; i++) maze[i][0] = maze[i][ysize - 1] = '#'; |
|
|
| 47 | for (j = 0; j < ysize; j++) maze[0][j] = maze[xsize - 1][j] = '#'; |
|
|
| 48 | |
|
|
| 49 | /* find how many free wall spots there are */ |
|
|
| 50 | wall_free_size = 2 * (xsize - 4) + 2 * (ysize - 4); |
|
|
| 51 | |
|
|
| 52 | make_wall_free_list (xsize, ysize); |
|
|
| 53 | |
|
|
| 54 | /* return the empty maze */ |
|
|
| 55 | if (wall_free_size <= 0) |
|
|
| 56 | return maze; |
|
|
| 57 | |
|
|
| 58 | /* recursively generate the walls of the maze */ |
|
|
| 59 | /* first pop a random starting point */ |
|
|
| 60 | while (wall_free_size > 0) |
|
|
| 61 | { |
|
|
| 62 | pop_wall_point (&i, &j); |
|
|
| 63 | |
|
|
| 64 | if (option) |
|
|
| 65 | fill_maze_full (maze, i, j, xsize, ysize); |
|
|
| 66 | else |
|
|
| 67 | fill_maze_sparse (maze, i, j, xsize, ysize); |
|
|
| 68 | } |
|
|
| 69 | |
|
|
| 70 | /* clean up our intermediate data structures. */ |
|
|
| 71 | |
|
|
| 72 | free (wall_x_list); |
|
|
| 73 | free (wall_y_list); |
|
|
| 74 | |
|
|
| 75 | return maze; |
|
|
| 76 | } |
|
|
| 77 | |
33 | |
| 78 | /* 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 |
| 79 | 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. */ |
| 80 | void |
36 | static void |
| 81 | make_wall_free_list (int xsize, int ysize) |
37 | make_wall_free_list (int xsize, int ysize) |
| 82 | { |
38 | { |
| 83 | int i, j, count; |
39 | int i, j, count; |
| 84 | |
40 | |
| 85 | count = 0; /* entries already placed in the free list */ |
41 | count = 0; /* entries already placed in the free list */ |
| … | |
… | |
| 112 | count++; |
68 | count++; |
| 113 | } |
69 | } |
| 114 | } |
70 | } |
| 115 | |
71 | |
| 116 | /* randomly returns one of the elements from the wall point list */ |
72 | /* randomly returns one of the elements from the wall point list */ |
| 117 | void |
73 | static void |
| 118 | pop_wall_point (int *x, int *y) |
74 | pop_wall_point (int *x, int *y) |
| 119 | { |
75 | { |
| 120 | int index = rndm (wall_free_size); |
76 | int index = rmg_rndm (wall_free_size); |
| 121 | |
77 | |
| 122 | *x = wall_x_list[index]; |
78 | *x = wall_x_list[index]; |
| 123 | *y = wall_y_list[index]; |
79 | *y = wall_y_list[index]; |
| 124 | /* write the last array point here */ |
80 | /* write the last array point here */ |
| 125 | wall_x_list[index] = wall_x_list[wall_free_size - 1]; |
81 | wall_x_list[index] = wall_x_list[wall_free_size - 1]; |
| … | |
… | |
| 128 | } |
84 | } |
| 129 | |
85 | |
| 130 | /* 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 |
| 131 | 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 |
| 132 | up, down, right, or left. */ |
88 | up, down, right, or left. */ |
| 133 | int |
89 | static int |
| 134 | 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) |
| 135 | { |
91 | { |
| 136 | |
|
|
| 137 | /* 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 */ |
| 138 | int dirlist[4]; |
93 | int dirlist[4]; |
| 139 | int count = 0; /* # elements in dirlist */ |
94 | int count = 0; /* # elements in dirlist */ |
| 140 | |
95 | |
| 141 | /* look up */ |
96 | /* look up */ |
| 142 | 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 */ |
| … | |
… | |
| 144 | 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]; |
| 145 | |
100 | |
| 146 | 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]; |
| 147 | |
102 | |
| 148 | if (cleartest == 0) |
103 | if (cleartest == 0) |
| 149 | { |
|
|
| 150 | dirlist[count] = 1; |
104 | dirlist[count++] = 1; |
| 151 | count++; |
|
|
| 152 | } |
|
|
| 153 | } |
105 | } |
| 154 | |
|
|
| 155 | |
106 | |
| 156 | /* look down */ |
107 | /* look down */ |
| 157 | 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 */ |
| 158 | { |
109 | { |
| 159 | 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]; |
| 160 | |
111 | |
| 161 | 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]; |
| 162 | |
113 | |
| 163 | if (cleartest == 0) |
114 | if (cleartest == 0) |
| 164 | { |
|
|
| 165 | dirlist[count] = 2; |
115 | dirlist[count++] = 2; |
| 166 | count++; |
|
|
| 167 | } |
|
|
| 168 | } |
116 | } |
| 169 | |
|
|
| 170 | |
117 | |
| 171 | /* look right */ |
118 | /* look right */ |
| 172 | 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 */ |
| 173 | { |
120 | { |
| 174 | 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]; |
| 175 | |
122 | |
| 176 | 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]; |
| 177 | |
124 | |
| 178 | if (cleartest == 0) |
125 | if (cleartest == 0) |
| 179 | { |
|
|
| 180 | dirlist[count] = 3; |
126 | dirlist[count++] = 3; |
| 181 | count++; |
|
|
| 182 | } |
|
|
| 183 | } |
127 | } |
| 184 | |
|
|
| 185 | |
128 | |
| 186 | /* look left */ |
129 | /* look left */ |
| 187 | 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 */ |
| 188 | { |
131 | { |
| 189 | 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]; |
| 190 | |
133 | |
| 191 | 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]; |
| 192 | |
135 | |
| 193 | if (cleartest == 0) |
136 | if (cleartest == 0) |
| 194 | { |
|
|
| 195 | dirlist[count] = 4; |
137 | dirlist[count++] = 4; |
| 196 | count++; |
|
|
| 197 | } |
|
|
| 198 | } |
138 | } |
| 199 | |
139 | |
| 200 | if (count == 0) |
140 | if (count == 0) |
| 201 | return -1; /* failed to find any clear points */ |
141 | return -1; /* failed to find any clear points */ |
| 202 | |
142 | |
| 203 | /* choose a random direction */ |
143 | /* choose a random direction */ |
| 204 | if (count > 1) |
|
|
| 205 | count = rndm (count); |
|
|
| 206 | else |
|
|
| 207 | count = 0; |
|
|
| 208 | |
|
|
| 209 | switch (dirlist[count]) |
144 | switch (dirlist [rmg_rndm (count)]) |
| 210 | { |
145 | { |
| 211 | case 1: /* up */ |
146 | case 1: /* up */ |
| 212 | { |
|
|
| 213 | *y = yc + 1; |
147 | *y = yc + 1; |
| 214 | *x = xc; |
148 | *x = xc; |
| 215 | break; |
149 | break; |
| 216 | }; |
150 | |
| 217 | case 2: /* down */ |
151 | case 2: /* down */ |
| 218 | { |
|
|
| 219 | *y = yc - 1; |
152 | *y = yc - 1; |
| 220 | *x = xc; |
153 | *x = xc; |
| 221 | break; |
154 | break; |
| 222 | }; |
155 | |
| 223 | case 3: /* right */ |
156 | case 3: /* right */ |
| 224 | { |
|
|
| 225 | *y = yc; |
157 | *y = yc; |
| 226 | *x = xc + 1; |
158 | *x = xc + 1; |
| 227 | break; |
159 | break; |
| 228 | } |
160 | |
| 229 | case 4: /* left */ |
161 | case 4: /* left */ |
| 230 | { |
|
|
| 231 | *x = xc - 1; |
162 | *x = xc - 1; |
| 232 | *y = yc; |
163 | *y = yc; |
| 233 | break; |
164 | break; |
| 234 | } |
165 | |
| 235 | default: /* ??? */ |
166 | default: /* ??? */ |
| 236 | return -1; |
167 | return -1; |
| 237 | |
168 | |
| 238 | } |
169 | } |
|
|
170 | |
| 239 | return 1; |
171 | return 1; |
| 240 | } |
172 | } |
| 241 | |
173 | |
| 242 | /* recursive routine which will fill every available space in the maze |
174 | /* recursive routine which will fill every available space in the maze |
| 243 | with walls*/ |
175 | with walls*/ |
| 244 | |
176 | static void |
| 245 | void |
|
|
| 246 | 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) |
| 247 | { |
178 | { |
| 248 | int xc, yc; |
179 | int xc, yc; |
| 249 | |
180 | |
| 250 | /* write a wall here */ |
181 | /* write a wall here */ |
| 251 | maze[x][y] = '#'; |
182 | maze[x][y] = '#'; |
| 252 | |
183 | |
| 253 | /* 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 */ |
| 254 | if (rndm (4) && wall_free_size > 0) |
185 | if (rmg_rndm (4) && wall_free_size > 0) |
| 255 | { |
186 | { |
| 256 | pop_wall_point (&xc, &yc); |
187 | pop_wall_point (&xc, &yc); |
| 257 | fill_maze_full (maze, xc, yc, xsize, ysize); |
188 | fill_maze_full (maze, xc, yc, xsize, ysize); |
| 258 | } |
189 | } |
| 259 | |
190 | |
| 260 | /* change the if to a while for a complete maze. */ |
191 | /* change the if to a while for a complete maze. */ |
| 261 | 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) |
| 262 | { |
|
|
| 263 | fill_maze_full (maze, xc, yc, xsize, ysize); |
193 | fill_maze_full (maze, xc, yc, xsize, ysize); |
| 264 | } |
|
|
| 265 | } |
194 | } |
| 266 | |
195 | |
| 267 | /* 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 |
| 268 | some free spots (possibly large) toward the center.*/ |
197 | some free spots (possibly large) toward the center.*/ |
| 269 | void |
198 | static void |
| 270 | 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) |
| 271 | { |
200 | { |
| 272 | int xc, yc; |
201 | int xc, yc; |
| 273 | |
202 | |
| 274 | /* write a wall here */ |
203 | /* write a wall here */ |
| 275 | maze[x][y] = '#'; |
204 | maze[x][y] = '#'; |
| 276 | |
205 | |
| 277 | /* 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 */ |
| 278 | if (rndm (4) && wall_free_size > 0) |
207 | if (rmg_rndm (4) && wall_free_size > 0) |
| 279 | { |
208 | { |
| 280 | pop_wall_point (&xc, &yc); |
209 | pop_wall_point (&xc, &yc); |
| 281 | fill_maze_sparse (maze, xc, yc, xsize, ysize); |
210 | fill_maze_sparse (maze, xc, yc, xsize, ysize); |
| 282 | } |
211 | } |
| 283 | |
212 | |
| 284 | /* change the if to a while for a complete maze. */ |
213 | /* change the if to a while for a complete maze. */ |
| 285 | 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) |
| 286 | fill_maze_sparse (maze, xc, yc, xsize, ysize); |
215 | fill_maze_sparse (maze, xc, yc, xsize, ysize); |
| 287 | } |
216 | } |
|
|
217 | |
|
|
218 | /* the outsize interface routine: accepts sizes, returns a char |
|
|
219 | ** maze. option is a flag for either a sparse or a full maze. Sparse |
|
|
220 | mazes have sizable rooms. option = 1, full, 0, sparse.*/ |
|
|
221 | void |
|
|
222 | maze_gen (Layout maze, int option) |
|
|
223 | { |
|
|
224 | maze->clear (); |
|
|
225 | maze->border (); |
|
|
226 | |
|
|
227 | /* find how many free wall spots there are */ |
|
|
228 | wall_free_size = 2 * (maze->w - 4) + 2 * (maze->h - 4); |
|
|
229 | |
|
|
230 | make_wall_free_list (maze->w, maze->h); |
|
|
231 | |
|
|
232 | /* return the empty maze */ |
|
|
233 | if (wall_free_size <= 0) |
|
|
234 | return; |
|
|
235 | |
|
|
236 | /* recursively generate the walls of the maze */ |
|
|
237 | /* first pop a random starting point */ |
|
|
238 | while (wall_free_size > 0) |
|
|
239 | { |
|
|
240 | int i, j; |
|
|
241 | |
|
|
242 | pop_wall_point (&i, &j); |
|
|
243 | |
|
|
244 | if (option) |
|
|
245 | fill_maze_full (maze, i, j, maze->w, maze->h); |
|
|
246 | else |
|
|
247 | fill_maze_sparse (maze, i, j, maze->w, maze->h); |
|
|
248 | } |
|
|
249 | |
|
|
250 | /* clean up our intermediate data structures. */ |
|
|
251 | |
|
|
252 | free (wall_x_list); |
|
|
253 | free (wall_y_list); |
|
|
254 | } |
|
|
255 | |
