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