| … | |
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| 35 | |
35 | |
| 36 | /* we need to maintain a list of wall points to generate |
36 | /* we need to maintain a list of wall points to generate |
| 37 | reasonable mazes: a straightforward recursive random walk maze |
37 | reasonable mazes: a straightforward recursive random walk maze |
| 38 | generator would generate a map with a trivial circle-the-outer-wall solution */ |
38 | generator would generate a map with a trivial circle-the-outer-wall solution */ |
| 39 | |
39 | |
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40 | #include <vector> |
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41 | |
| 40 | #include <global.h> |
42 | #include <global.h> |
| 41 | |
43 | |
| 42 | #include "random_map.h" |
44 | #include "random_map.h" |
| 43 | #include "rproto.h" |
45 | #include "rproto.h" |
| 44 | |
46 | |
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47 | struct point |
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48 | { |
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49 | short x; |
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50 | short y; |
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51 | |
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52 | point () |
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53 | { |
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54 | } |
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55 | |
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56 | point (int x, int y) |
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57 | : x(x), y(y) |
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58 | { |
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59 | } |
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60 | }; |
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61 | |
| 45 | /* global variables that everyone needs: don't want to pass them in |
62 | /* global variables that everyone needs: don't want to pass them in |
| 46 | as parameters every time. */ |
63 | as parameters every time. */ |
| 47 | static int *wall_x_list = 0; |
64 | static point *seed_list; |
| 48 | static int *wall_y_list = 0; |
65 | static int seed_size; |
| 49 | static int wall_free_size = 0; |
66 | static int xsize, ysize; |
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67 | static char **maze; |
| 50 | |
68 | |
| 51 | /* the free wall points are those outer points which aren't corners or |
69 | /* the free wall points are those outer points which aren't corners or |
| 52 | near corners, and don't have a maze wall growing out of them already. */ |
70 | near corners, and don't have a maze wall growing out of them already. */ |
| 53 | static void |
71 | static void |
| 54 | make_wall_free_list (int xsize, int ysize) |
72 | make_wall_free_list () |
| 55 | { |
73 | { |
| 56 | int i, j, count; |
74 | // xsize * ysize is plenty too much, but it's temporary |
| 57 | |
75 | seed_list = salloc<point> (xsize * ysize); |
| 58 | count = 0; /* entries already placed in the free list */ |
76 | seed_size = 0; |
| 59 | /*allocate it */ |
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| 60 | if (wall_free_size < 0) |
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| 61 | return; |
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| 62 | |
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| 63 | wall_x_list = (int *)calloc (sizeof (int), wall_free_size); |
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| 64 | wall_y_list = (int *)calloc (sizeof (int), wall_free_size); |
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| 65 | |
77 | |
| 66 | /* top and bottom wall */ |
78 | /* top and bottom wall */ |
| 67 | for (i = 2; i < xsize - 2; i++) |
79 | for (int x = 2; x < xsize - 2; x++) |
| 68 | { |
80 | { |
| 69 | wall_x_list[count] = i; |
81 | seed_list [seed_size++] = point (x, 0); |
| 70 | wall_y_list[count] = 0; |
82 | seed_list [seed_size++] = point (x, ysize - 1); |
| 71 | count++; |
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| 72 | wall_x_list[count] = i; |
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| 73 | wall_y_list[count] = ysize - 1; |
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| 74 | count++; |
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| 75 | } |
83 | } |
| 76 | |
84 | |
| 77 | /* left and right wall */ |
85 | /* left and right wall */ |
| 78 | for (j = 2; j < ysize - 2; j++) |
86 | for (int y = 2; y < ysize - 2; y++) |
| 79 | { |
87 | { |
| 80 | wall_x_list[count] = 0; |
88 | seed_list [seed_size++] = point (0, y); |
| 81 | wall_y_list[count] = j; |
89 | seed_list [seed_size++] = point (xsize - 1, y); |
| 82 | count++; |
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| 83 | wall_x_list[count] = xsize - 1; |
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| 84 | wall_y_list[count] = j; |
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| 85 | count++; |
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| 86 | } |
90 | } |
| 87 | } |
91 | } |
| 88 | |
92 | |
| 89 | /* randomly returns one of the elements from the wall point list */ |
93 | /* randomly returns one of the elements from the wall point list */ |
| 90 | static void |
94 | static point |
| 91 | pop_wall_point (int *x, int *y) |
95 | pop_point () |
| 92 | { |
96 | { |
| 93 | int index = rmg_rndm (wall_free_size); |
97 | int index = rmg_rndm (seed_size); |
| 94 | |
98 | |
| 95 | *x = wall_x_list[index]; |
99 | point p = seed_list [index]; |
| 96 | *y = wall_y_list[index]; |
100 | |
| 97 | /* write the last array point here */ |
101 | /* write the last array point here */ |
| 98 | wall_x_list[index] = wall_x_list[wall_free_size - 1]; |
102 | seed_list [index] = seed_list [--seed_size]; |
| 99 | wall_y_list[index] = wall_y_list[wall_free_size - 1]; |
103 | |
| 100 | wall_free_size--; |
104 | return p; |
| 101 | } |
105 | } |
| 102 | |
106 | |
| 103 | /* find free point: randomly look for a square adjacent to this one where |
107 | /* find free point: randomly look for a square adjacent to this one where |
| 104 | we can place a new block without closing a path. We may only look |
108 | we can place a new block without closing a path. We may only look |
| 105 | up, down, right, or left. */ |
109 | up, down, right, or left. */ |
| 106 | static int |
110 | static int |
| 107 | find_free_point (char **maze, int *x, int *y, int xc, int yc, int xsize, int ysize) |
111 | find_free_point (point &p, point pc) |
| 108 | { |
112 | { |
| 109 | /* we will randomly pick from this list, 1=up,2=down,3=right,4=left */ |
113 | /* we will randomly pick from this list, 1=up,2=down,3=right,4=left */ |
| 110 | int dirlist[4]; |
114 | int dirlist[4]; |
| 111 | int count = 0; /* # elements in dirlist */ |
115 | int count = 0; /* # elements in dirlist */ |
| 112 | |
116 | |
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117 | int xc = pc.x; |
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118 | int yc = pc.y; |
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119 | |
| 113 | /* look up */ |
120 | /* look up */ |
| 114 | if (yc < ysize - 2 && xc > 2 && xc < xsize - 2) /* it is valid to look up */ |
121 | if (yc < ysize - 2 && xc > 2 && xc < xsize - 2) /* it is valid to look up */ |
| 115 | { |
122 | { |
| 116 | int cleartest = (int) maze[xc][yc + 1] + (int) maze[xc - 1][yc + 1] + (int) maze[xc + 1][yc + 1]; |
123 | int cleartest = maze[xc][yc + 1] + maze[xc - 1][yc + 1] + maze[xc + 1][yc + 1] |
| 117 | |
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| 118 | cleartest += (int) maze[xc][yc + 2] + (int) maze[xc - 1][yc + 2] + (int) maze[xc + 1][yc + 2]; |
124 | + maze[xc][yc + 2] + maze[xc - 1][yc + 2] + maze[xc + 1][yc + 2]; |
| 119 | |
125 | |
| 120 | if (cleartest == 0) |
126 | if (cleartest == 0) |
| 121 | dirlist[count++] = 1; |
127 | dirlist[count++] = 1; |
| 122 | } |
128 | } |
| 123 | |
129 | |
| 124 | /* look down */ |
130 | /* look down */ |
| 125 | if (yc > 2 && xc > 2 && xc < xsize - 2) /* it is valid to look down */ |
131 | if (yc > 2 && xc > 2 && xc < xsize - 2) /* it is valid to look down */ |
| 126 | { |
132 | { |
| 127 | int cleartest = (int) maze[xc][yc - 1] + (int) maze[xc - 1][yc - 1] + (int) maze[xc + 1][yc - 1]; |
133 | int cleartest = maze[xc][yc - 1] + maze[xc - 1][yc - 1] + maze[xc + 1][yc - 1] |
| 128 | |
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| 129 | cleartest += (int) maze[xc][yc - 2] + (int) maze[xc - 1][yc - 2] + (int) maze[xc + 1][yc - 2]; |
134 | + maze[xc][yc - 2] + maze[xc - 1][yc - 2] + maze[xc + 1][yc - 2]; |
| 130 | |
135 | |
| 131 | if (cleartest == 0) |
136 | if (cleartest == 0) |
| 132 | dirlist[count++] = 2; |
137 | dirlist[count++] = 2; |
| 133 | } |
138 | } |
| 134 | |
139 | |
| 135 | /* look right */ |
140 | /* look right */ |
| 136 | if (xc < xsize - 2 && yc > 2 && yc < ysize - 2) /* it is valid to look left */ |
141 | if (xc < xsize - 2 && yc > 2 && yc < ysize - 2) /* it is valid to look left */ |
| 137 | { |
142 | { |
| 138 | int cleartest = (int) maze[xc + 1][yc] + (int) maze[xc + 1][yc - 1] + (int) maze[xc + 1][yc + 1]; |
143 | int cleartest = maze[xc + 1][yc] + maze[xc + 1][yc - 1] + maze[xc + 1][yc + 1] |
| 139 | |
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| 140 | cleartest += (int) maze[xc + 2][yc] + (int) maze[xc + 2][yc - 1] + (int) maze[xc + 2][yc + 1]; |
144 | + maze[xc + 2][yc] + maze[xc + 2][yc - 1] + maze[xc + 2][yc + 1]; |
| 141 | |
145 | |
| 142 | if (cleartest == 0) |
146 | if (cleartest == 0) |
| 143 | dirlist[count++] = 3; |
147 | dirlist[count++] = 3; |
| 144 | } |
148 | } |
| 145 | |
149 | |
| 146 | /* look left */ |
150 | /* look left */ |
| 147 | if (xc > 2 && yc > 2 && yc < ysize - 2) /* it is valid to look down */ |
151 | if (xc > 2 && yc > 2 && yc < ysize - 2) /* it is valid to look down */ |
| 148 | { |
152 | { |
| 149 | int cleartest = (int) maze[xc - 1][yc] + (int) maze[xc - 1][yc - 1] + (int) maze[xc - 1][yc + 1]; |
153 | int cleartest = maze[xc - 1][yc] + maze[xc - 1][yc - 1] + maze[xc - 1][yc + 1] |
| 150 | |
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| 151 | cleartest += (int) maze[xc - 2][yc] + (int) maze[xc - 2][yc - 1] + (int) maze[xc - 2][yc + 1]; |
154 | + maze[xc - 2][yc] + maze[xc - 2][yc - 1] + maze[xc - 2][yc + 1]; |
| 152 | |
155 | |
| 153 | if (cleartest == 0) |
156 | if (cleartest == 0) |
| 154 | dirlist[count++] = 4; |
157 | dirlist[count++] = 4; |
| 155 | } |
158 | } |
| 156 | |
159 | |
| … | |
… | |
| 159 | |
162 | |
| 160 | /* choose a random direction */ |
163 | /* choose a random direction */ |
| 161 | switch (dirlist [rmg_rndm (count)]) |
164 | switch (dirlist [rmg_rndm (count)]) |
| 162 | { |
165 | { |
| 163 | case 1: /* up */ |
166 | case 1: /* up */ |
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167 | p.x = xc; |
| 164 | *y = yc + 1; |
168 | p.y = yc + 1; |
| 165 | *x = xc; |
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| 166 | break; |
169 | break; |
| 167 | |
170 | |
| 168 | case 2: /* down */ |
171 | case 2: /* down */ |
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172 | p.x = xc; |
| 169 | *y = yc - 1; |
173 | p.y = yc - 1; |
| 170 | *x = xc; |
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| 171 | break; |
174 | break; |
| 172 | |
175 | |
| 173 | case 3: /* right */ |
176 | case 3: /* right */ |
| 174 | *y = yc; |
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| 175 | *x = xc + 1; |
177 | p.x = xc + 1; |
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178 | p.y = yc; |
| 176 | break; |
179 | break; |
| 177 | |
180 | |
| 178 | case 4: /* left */ |
181 | case 4: /* left */ |
| 179 | *x = xc - 1; |
182 | p.x = xc - 1; |
| 180 | *y = yc; |
183 | p.y = yc; |
| 181 | break; |
184 | break; |
| 182 | |
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| 183 | default: /* ??? */ |
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| 184 | return -1; |
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| 185 | |
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| 186 | } |
185 | } |
| 187 | |
186 | |
| 188 | return 1; |
187 | return 1; |
| 189 | } |
188 | } |
| 190 | |
189 | |
| 191 | /* recursive routine which will fill every available space in the maze |
190 | /* recursive routine which will fill every available space in the maze |
| 192 | with walls*/ |
191 | with walls*/ |
| 193 | static void |
192 | static void |
| 194 | fill_maze_full (char **maze, int x, int y, int xsize, int ysize) |
193 | fill_maze_full (point p) |
| 195 | { |
194 | { |
| 196 | int xc, yc; |
195 | point pc; |
| 197 | |
196 | |
| 198 | /* write a wall here */ |
197 | /* write a wall here */ |
| 199 | maze[x][y] = '#'; |
198 | maze[p.x][p.y] = '#'; |
| 200 | |
199 | |
| 201 | /* decide if we're going to pick from the wall_free_list */ |
200 | /* decide if we're going to pick from the wall_free_list */ |
| 202 | if (rmg_rndm (4) && wall_free_size > 0) |
201 | if (rmg_rndm (2) && seed_size) |
| 203 | { |
202 | fill_maze_full (pop_point ()); |
| 204 | pop_wall_point (&xc, &yc); |
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| 205 | fill_maze_full (maze, xc, yc, xsize, ysize); |
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| 206 | } |
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| 207 | |
203 | |
| 208 | /* change the if to a while for a complete maze. */ |
204 | /* change the while to an if for a sparse maze. */ |
| 209 | while (find_free_point (maze, &xc, &yc, x, y, xsize, ysize) != -1) |
205 | while (find_free_point (pc, p) != -1) |
| 210 | fill_maze_full (maze, xc, yc, xsize, ysize); |
206 | fill_maze_full (pc); |
| 211 | } |
207 | } |
| 212 | |
208 | |
| 213 | /* recursive routine which will fill much of the maze, but will leave |
209 | /* recursive routine which will fill much of the maze, but will leave |
| 214 | some free spots (possibly large) toward the center.*/ |
210 | some free spots (possibly large) toward the center.*/ |
| 215 | static void |
211 | static void |
| 216 | fill_maze_sparse (char **maze, int x, int y, int xsize, int ysize) |
212 | fill_maze_sparse (point p) |
| 217 | { |
213 | { |
| 218 | int xc, yc; |
214 | point pc; |
| 219 | |
215 | |
| 220 | /* write a wall here */ |
216 | /* write a wall here */ |
| 221 | maze[x][y] = '#'; |
217 | maze[p.x][p.y] = '#'; |
| 222 | |
218 | |
| 223 | /* decide if we're going to pick from the wall_free_list */ |
219 | /* decide if we're going to pick from the wall_free_list */ |
| 224 | if (rmg_rndm (4) && wall_free_size > 0) |
220 | if (rmg_rndm (2) && seed_size) |
| 225 | { |
221 | fill_maze_full (pop_point ()); |
| 226 | pop_wall_point (&xc, &yc); |
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| 227 | fill_maze_sparse (maze, xc, yc, xsize, ysize); |
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| 228 | } |
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| 229 | |
222 | |
| 230 | /* change the if to a while for a complete maze. */ |
223 | /* change the if to a while for a complete maze. */ |
| 231 | if (find_free_point (maze, &xc, &yc, x, y, xsize, ysize) != -1) |
224 | if (find_free_point (pc, p) != -1) |
| 232 | fill_maze_sparse (maze, xc, yc, xsize, ysize); |
225 | fill_maze_full (pc); |
| 233 | } |
226 | } |
| 234 | |
227 | |
| 235 | /* the outsize interface routine: accepts sizes, returns a char |
228 | /* the outsize interface routine: accepts sizes, returns a char |
| 236 | ** maze. option is a flag for either a sparse or a full maze. Sparse |
229 | ** maze. option is a flag for either a sparse or a full maze. Sparse |
| 237 | mazes have sizable rooms. option = 1, full, 0, sparse.*/ |
230 | mazes have sizable rooms. option = 1, full, 0, sparse.*/ |
| 238 | void |
231 | void |
| 239 | maze_gen (Layout maze, int option) |
232 | maze_gen (Layout maze, int full) |
| 240 | { |
233 | { |
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234 | xsize = maze->w; |
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235 | ysize = maze->h; |
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236 | ::maze = maze; |
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237 | |
| 241 | maze->clear (); |
238 | maze->clear (); |
| 242 | maze->border (); |
239 | maze->border (); |
| 243 | |
240 | |
| 244 | /* find how many free wall spots there are */ |
241 | if (xsize < 4 || ysize < 4) |
| 245 | wall_free_size = 2 * (maze->w - 4) + 2 * (maze->h - 4); |
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| 246 | |
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| 247 | make_wall_free_list (maze->w, maze->h); |
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| 248 | |
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| 249 | /* return the empty maze */ |
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| 250 | if (wall_free_size <= 0) |
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| 251 | return; |
242 | return; |
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243 | |
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244 | make_wall_free_list (); |
| 252 | |
245 | |
| 253 | /* recursively generate the walls of the maze */ |
246 | /* recursively generate the walls of the maze */ |
| 254 | /* first pop a random starting point */ |
247 | /* first pop a random starting point */ |
| 255 | while (wall_free_size > 0) |
248 | while (seed_size) |
| 256 | { |
249 | if (full) |
| 257 | int i, j; |
250 | fill_maze_full (pop_point ()); |
| 258 | |
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| 259 | pop_wall_point (&i, &j); |
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| 260 | |
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| 261 | if (option) |
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| 262 | fill_maze_full (maze, i, j, maze->w, maze->h); |
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| 263 | else |
251 | else |
| 264 | fill_maze_sparse (maze, i, j, maze->w, maze->h); |
252 | fill_maze_sparse (pop_point ()); |
| 265 | } |
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| 266 | |
253 | |
| 267 | /* clean up our intermediate data structures. */ |
254 | /* clean up our intermediate data structures. */ |
| 268 | |
255 | sfree (seed_list, xsize * ysize); |
| 269 | free (wall_x_list); |
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| 270 | free (wall_y_list); |
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| 271 | } |
256 | } |
| 272 | |
257 | |
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258 | #if 0 |
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259 | static struct demo |
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260 | { |
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261 | demo () |
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262 | { |
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263 | Layout layout (30, 30); |
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264 | rmg_rndm.seed (time (0)); |
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265 | |
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266 | for(int i=1;i<10;++i) |
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267 | { |
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268 | maze_gen (layout, 1); |
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269 | layout.print (); |
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270 | } |
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271 | exit (1); |
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272 | } |
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273 | } demo; |
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274 | #endif |
