| 1 | |
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| 2 | |
1 | |
| 3 | /* peterm@langmuir.eecs.berkeley.edu: this function generates a random |
2 | /* peterm@langmuir.eecs.berkeley.edu: this function generates a random |
| 4 | 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 |
| 5 | 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. |
| 6 | |
5 | |
| … | |
… | |
| 16 | reasonable mazes: a straightforward recursive random walk maze |
15 | reasonable mazes: a straightforward recursive random walk maze |
| 17 | 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 */ |
| 18 | |
17 | |
| 19 | #include <stdio.h> |
18 | #include <stdio.h> |
| 20 | #include <global.h> |
19 | #include <global.h> |
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20 | |
| 21 | /*#include <random_map.h>*/ |
21 | /*#include <random_map.h>*/ |
| 22 | #include <maze_gen.h> |
22 | #include <maze_gen.h> |
| 23 | #include <time.h> |
23 | #include <time.h> |
| 24 | |
24 | |
| 25 | |
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| 26 | /* this include solely, and only, is needed for the definition of RANDOM */ |
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| 27 | |
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| 28 | |
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| 29 | |
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| 30 | /* 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 |
| 31 | as parameters every time. */ |
26 | as parameters every time. */ |
| 32 | int *wall_x_list=0; |
27 | int *wall_x_list = 0; |
| 33 | int *wall_y_list=0; |
28 | int *wall_y_list = 0; |
| 34 | int wall_free_size=0; |
29 | int wall_free_size = 0; |
| 35 | |
30 | |
| 36 | /* heuristically, we need to change wall_chance based on the size of |
31 | /* heuristically, we need to change wall_chance based on the size of |
| 37 | the maze. */ |
32 | the maze. */ |
| 38 | |
33 | |
| 39 | int wall_chance; |
34 | int wall_chance; |
| 40 | |
35 | |
| 41 | /* the outsize interface routine: accepts sizes, returns a char |
36 | /* the outsize interface routine: accepts sizes, returns a char |
| 42 | ** maze. option is a flag for either a sparse or a full maze. Sparse |
37 | ** maze. option is a flag for either a sparse or a full maze. Sparse |
| 43 | mazes have sizable rooms. option = 1, full, 0, sparse.*/ |
38 | mazes have sizable rooms. option = 1, full, 0, sparse.*/ |
| 44 | |
39 | |
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40 | char ** |
| 45 | char **maze_gen(int xsize, int ysize,int option) { |
41 | maze_gen (int xsize, int ysize, int option) |
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42 | { |
| 46 | int i,j; |
43 | int i, j; |
| 47 | |
44 | |
| 48 | /* allocate that array, set it up */ |
45 | /* allocate that array, set it up */ |
| 49 | char **maze = (char **)calloc(sizeof(char*),xsize); |
46 | char **maze = (char **) calloc (sizeof (char *), xsize); |
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47 | |
| 50 | for(i=0;i<xsize;i++) { |
48 | for (i = 0; i < xsize; i++) |
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49 | { |
| 51 | maze[i] = (char *) calloc(sizeof(char),ysize); |
50 | maze[i] = (char *) calloc (sizeof (char), ysize); |
| 52 | } |
51 | } |
| 53 | |
52 | |
| 54 | /* write the outer walls */ |
53 | /* write the outer walls */ |
| 55 | for(i=0;i<xsize;i++) |
54 | for (i = 0; i < xsize; i++) |
| 56 | maze[i][0] = maze[i][ysize-1] = '#'; |
55 | maze[i][0] = maze[i][ysize - 1] = '#'; |
| 57 | for(j=0;j<ysize;j++) |
56 | for (j = 0; j < ysize; j++) |
| 58 | maze[0][j] = maze[xsize-1][j] = '#'; |
57 | maze[0][j] = maze[xsize - 1][j] = '#'; |
| 59 | |
58 | |
| 60 | |
59 | |
| 61 | /* find how many free wall spots there are */ |
60 | /* find how many free wall spots there are */ |
| 62 | wall_free_size = 2 * (xsize-4) + 2*(ysize-4 ); |
61 | wall_free_size = 2 * (xsize - 4) + 2 * (ysize - 4); |
| 63 | |
62 | |
| 64 | make_wall_free_list(xsize,ysize); |
63 | make_wall_free_list (xsize, ysize); |
| 65 | |
64 | |
| 66 | /* return the empty maze */ |
65 | /* return the empty maze */ |
| 67 | if(wall_free_size <=0 ) return maze; |
66 | if (wall_free_size <= 0) |
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67 | return maze; |
| 68 | |
68 | |
| 69 | /* recursively generate the walls of the maze */ |
69 | /* recursively generate the walls of the maze */ |
| 70 | /* first pop a random starting point */ |
70 | /* first pop a random starting point */ |
| 71 | while(wall_free_size > 0) { |
71 | while (wall_free_size > 0) |
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72 | { |
| 72 | pop_wall_point(&i,&j); |
73 | pop_wall_point (&i, &j); |
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74 | if (option) |
| 73 | if(option) fill_maze_full(maze,i,j,xsize,ysize); |
75 | fill_maze_full (maze, i, j, xsize, ysize); |
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76 | else |
| 74 | else fill_maze_sparse(maze,i,j,xsize,ysize); |
77 | fill_maze_sparse (maze, i, j, xsize, ysize); |
| 75 | } |
78 | } |
| 76 | |
79 | |
| 77 | /* clean up our intermediate data structures. */ |
80 | /* clean up our intermediate data structures. */ |
| 78 | |
81 | |
| 79 | free(wall_x_list); |
82 | free (wall_x_list); |
| 80 | free(wall_y_list); |
83 | free (wall_y_list); |
| 81 | |
84 | |
| 82 | return maze; |
85 | return maze; |
| 83 | } |
86 | } |
| 84 | |
87 | |
| 85 | |
88 | |
| 86 | |
89 | |
| 87 | /* the free wall points are those outer points which aren't corners or |
90 | /* the free wall points are those outer points which aren't corners or |
| 88 | near corners, and don't have a maze wall growing out of them already. */ |
91 | near corners, and don't have a maze wall growing out of them already. */ |
| 89 | |
92 | |
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93 | void |
| 90 | void make_wall_free_list(int xsize, int ysize) { |
94 | make_wall_free_list (int xsize, int ysize) |
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95 | { |
| 91 | int i,j,count; |
96 | int i, j, count; |
| 92 | |
97 | |
| 93 | count = 0; /* entries already placed in the free list */ |
98 | count = 0; /* entries already placed in the free list */ |
| 94 | /*allocate it*/ |
99 | /*allocate it */ |
| 95 | if(wall_free_size < 0) return; |
100 | if (wall_free_size < 0) |
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101 | return; |
| 96 | wall_x_list = (int *) calloc(sizeof(int),wall_free_size); |
102 | wall_x_list = (int *) calloc (sizeof (int), wall_free_size); |
| 97 | wall_y_list = (int *) calloc(sizeof(int),wall_free_size); |
103 | wall_y_list = (int *) calloc (sizeof (int), wall_free_size); |
| 98 | |
104 | |
| 99 | |
105 | |
| 100 | /* top and bottom wall */ |
106 | /* top and bottom wall */ |
| 101 | for(i = 2; i<xsize-2; i++) { |
107 | for (i = 2; i < xsize - 2; i++) |
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108 | { |
| 102 | wall_x_list[count] = i; |
109 | wall_x_list[count] = i; |
| 103 | wall_y_list[count] = 0; |
110 | wall_y_list[count] = 0; |
| 104 | count++; |
111 | count++; |
| 105 | wall_x_list[count] = i; |
112 | wall_x_list[count] = i; |
| 106 | wall_y_list[count] = ysize-1; |
113 | wall_y_list[count] = ysize - 1; |
| 107 | count++; |
114 | count++; |
| 108 | } |
115 | } |
| 109 | |
116 | |
| 110 | /* left and right wall */ |
117 | /* left and right wall */ |
| 111 | for(j = 2; j<ysize-2; j++) { |
118 | for (j = 2; j < ysize - 2; j++) |
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119 | { |
| 112 | wall_x_list[count] = 0; |
120 | wall_x_list[count] = 0; |
| 113 | wall_y_list[count] = j; |
121 | wall_y_list[count] = j; |
| 114 | count++; |
122 | count++; |
| 115 | wall_x_list[count] = xsize-1; |
123 | wall_x_list[count] = xsize - 1; |
| 116 | wall_y_list[count] = j; |
124 | wall_y_list[count] = j; |
| 117 | count++; |
125 | count++; |
| 118 | } |
126 | } |
| 119 | } |
127 | } |
| 120 | |
128 | |
| 121 | |
129 | |
| 122 | |
130 | |
| 123 | /* randomly returns one of the elements from the wall point list */ |
131 | /* randomly returns one of the elements from the wall point list */ |
| 124 | |
132 | |
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133 | void |
| 125 | void pop_wall_point(int *x,int *y) { |
134 | pop_wall_point (int *x, int *y) |
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135 | { |
| 126 | int index = RANDOM() % wall_free_size; |
136 | int index = rndm (wall_free_size); |
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137 | |
| 127 | *x = wall_x_list[index]; |
138 | *x = wall_x_list[index]; |
| 128 | *y = wall_y_list[index]; |
139 | *y = wall_y_list[index]; |
| 129 | /* write the last array point here */ |
140 | /* write the last array point here */ |
| 130 | wall_x_list[index]=wall_x_list[wall_free_size-1]; |
141 | wall_x_list[index] = wall_x_list[wall_free_size - 1]; |
| 131 | wall_y_list[index]=wall_y_list[wall_free_size-1]; |
142 | wall_y_list[index] = wall_y_list[wall_free_size - 1]; |
| 132 | wall_free_size--; |
143 | wall_free_size--; |
| 133 | } |
144 | } |
| 134 | |
145 | |
| 135 | |
146 | |
| 136 | |
147 | |
| 137 | /* find free point: randomly look for a square adjacent to this one where |
148 | /* find free point: randomly look for a square adjacent to this one where |
| 138 | we can place a new block without closing a path. We may only look |
149 | we can place a new block without closing a path. We may only look |
| 139 | up, down, right, or left. */ |
150 | up, down, right, or left. */ |
| 140 | |
151 | |
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152 | int |
| 141 | int find_free_point(char **maze,int *x, int *y,int xc,int yc, int xsize, int ysize) { |
153 | find_free_point (char **maze, int *x, int *y, int xc, int yc, int xsize, int ysize) |
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154 | { |
| 142 | |
155 | |
| 143 | /* we will randomly pick from this list, 1=up,2=down,3=right,4=left */ |
156 | /* we will randomly pick from this list, 1=up,2=down,3=right,4=left */ |
| 144 | int dirlist[4]; |
157 | int dirlist[4]; |
| 145 | int count = 0; /* # elements in dirlist */ |
158 | int count = 0; /* # elements in dirlist */ |
| 146 | |
159 | |
| 147 | /* look up */ |
160 | /* look up */ |
| 148 | if(yc < ysize-2 && xc > 2 && xc < xsize-2) /* it is valid to look up */ |
161 | if (yc < ysize - 2 && xc > 2 && xc < xsize - 2) /* it is valid to look up */ |
| 149 | { |
162 | { |
| 150 | int cleartest = (int) maze[xc][yc+1] + (int)maze[xc-1][yc+1] |
163 | int cleartest = (int) maze[xc][yc + 1] + (int) maze[xc - 1][yc + 1] + (int) maze[xc + 1][yc + 1]; |
| 151 | + (int) maze[xc+1][yc+1]; |
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| 152 | cleartest += (int) maze[xc][yc+2] + (int)maze[xc-1][yc+2] |
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| 153 | + (int) maze[xc+1][yc+2]; |
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| 154 | |
164 | |
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165 | cleartest += (int) maze[xc][yc + 2] + (int) maze[xc - 1][yc + 2] + (int) maze[xc + 1][yc + 2]; |
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166 | |
| 155 | if(cleartest == 0) { |
167 | if (cleartest == 0) |
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168 | { |
| 156 | dirlist[count] = 1; |
169 | dirlist[count] = 1; |
| 157 | count++; |
170 | count++; |
| 158 | } |
171 | } |
| 159 | } |
172 | } |
| 160 | |
173 | |
| 161 | |
174 | |
| 162 | /* look down */ |
175 | /* look down */ |
| 163 | if(yc > 2 && xc > 2 && xc < xsize-2) /* it is valid to look down */ |
176 | if (yc > 2 && xc > 2 && xc < xsize - 2) /* it is valid to look down */ |
| 164 | { |
177 | { |
| 165 | int cleartest = (int) maze[xc][yc-1] + (int)maze[xc-1][yc-1] |
178 | int cleartest = (int) maze[xc][yc - 1] + (int) maze[xc - 1][yc - 1] + (int) maze[xc + 1][yc - 1]; |
| 166 | + (int) maze[xc+1][yc-1]; |
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| 167 | cleartest += (int) maze[xc][yc-2] + (int)maze[xc-1][yc-2] |
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| 168 | + (int) maze[xc+1][yc-2]; |
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| 169 | |
179 | |
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180 | cleartest += (int) maze[xc][yc - 2] + (int) maze[xc - 1][yc - 2] + (int) maze[xc + 1][yc - 2]; |
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181 | |
| 170 | if(cleartest == 0) { |
182 | if (cleartest == 0) |
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183 | { |
| 171 | dirlist[count] = 2; |
184 | dirlist[count] = 2; |
| 172 | count++; |
185 | count++; |
| 173 | } |
186 | } |
| 174 | } |
187 | } |
| 175 | |
188 | |
| 176 | |
189 | |
| 177 | /* look right */ |
190 | /* look right */ |
| 178 | if(xc < xsize- 2 && yc > 2 && yc < ysize-2) /* it is valid to look left */ |
191 | if (xc < xsize - 2 && yc > 2 && yc < ysize - 2) /* it is valid to look left */ |
| 179 | { |
192 | { |
| 180 | int cleartest = (int) maze[xc+1][yc] + (int)maze[xc+1][yc-1] |
193 | int cleartest = (int) maze[xc + 1][yc] + (int) maze[xc + 1][yc - 1] + (int) maze[xc + 1][yc + 1]; |
| 181 | + (int) maze[xc+1][yc+1]; |
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| 182 | cleartest += (int) maze[xc+2][yc] + (int)maze[xc+2][yc-1] |
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| 183 | + (int) maze[xc+2][yc+1]; |
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| 184 | |
194 | |
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195 | cleartest += (int) maze[xc + 2][yc] + (int) maze[xc + 2][yc - 1] + (int) maze[xc + 2][yc + 1]; |
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196 | |
| 185 | if(cleartest == 0) { |
197 | if (cleartest == 0) |
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198 | { |
| 186 | dirlist[count] = 3; |
199 | dirlist[count] = 3; |
| 187 | count++; |
200 | count++; |
| 188 | } |
201 | } |
| 189 | } |
202 | } |
| 190 | |
203 | |
| 191 | |
204 | |
| 192 | /* look left */ |
205 | /* look left */ |
| 193 | if(xc > 2 && yc > 2 && yc < ysize-2) /* it is valid to look down */ |
206 | if (xc > 2 && yc > 2 && yc < ysize - 2) /* it is valid to look down */ |
| 194 | { |
207 | { |
| 195 | int cleartest = (int) maze[xc-1][yc] + (int)maze[xc-1][yc-1] |
208 | int cleartest = (int) maze[xc - 1][yc] + (int) maze[xc - 1][yc - 1] + (int) maze[xc - 1][yc + 1]; |
| 196 | + (int) maze[xc-1][yc+1]; |
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| 197 | cleartest += (int) maze[xc-2][yc] + (int)maze[xc-2][yc-1] |
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| 198 | + (int) maze[xc-2][yc+1]; |
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| 199 | |
209 | |
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210 | cleartest += (int) maze[xc - 2][yc] + (int) maze[xc - 2][yc - 1] + (int) maze[xc - 2][yc + 1]; |
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211 | |
| 200 | if(cleartest == 0) { |
212 | if (cleartest == 0) |
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213 | { |
| 201 | dirlist[count] = 4; |
214 | dirlist[count] = 4; |
| 202 | count++; |
215 | count++; |
| 203 | } |
216 | } |
| 204 | } |
217 | } |
| 205 | |
218 | |
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219 | if (count == 0) |
| 206 | if(count==0) return -1; /* failed to find any clear points */ |
220 | return -1; /* failed to find any clear points */ |
| 207 | |
221 | |
| 208 | /* choose a random direction */ |
222 | /* choose a random direction */ |
| 209 | if(count > 1) count = RANDOM() % count; |
223 | if (count > 1) |
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224 | count = rndm (count); |
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225 | else |
| 210 | else count=0; |
226 | count = 0; |
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227 | |
| 211 | switch(dirlist[count]) { |
228 | switch (dirlist[count]) |
| 212 | case 1: /* up */ |
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| 213 | { |
229 | { |
| 214 | *y = yc +1; |
230 | case 1: /* up */ |
| 215 | *x = xc; |
231 | { |
| 216 | break; |
232 | *y = yc + 1; |
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233 | *x = xc; |
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234 | break; |
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235 | }; |
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236 | case 2: /* down */ |
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237 | { |
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238 | *y = yc - 1; |
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239 | *x = xc; |
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240 | break; |
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241 | }; |
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242 | case 3: /* right */ |
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243 | { |
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244 | *y = yc; |
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245 | *x = xc + 1; |
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246 | break; |
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247 | } |
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248 | case 4: /* left */ |
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249 | { |
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250 | *x = xc - 1; |
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251 | *y = yc; |
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252 | break; |
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253 | } |
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254 | default: /* ??? */ |
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255 | { |
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256 | return -1; |
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257 | } |
| 217 | }; |
258 | } |
| 218 | case 2: /* down */ |
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| 219 | { |
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| 220 | *y = yc-1; |
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| 221 | *x = xc; |
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| 222 | break; |
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| 223 | }; |
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| 224 | case 3: /* right */ |
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| 225 | { |
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| 226 | *y = yc; |
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| 227 | *x = xc+1; |
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| 228 | break; |
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| 229 | } |
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| 230 | case 4: /* left */ |
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| 231 | { |
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| 232 | *x = xc-1; |
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| 233 | *y = yc; |
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| 234 | break; |
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| 235 | } |
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| 236 | default: /* ??? */ |
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| 237 | { |
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| 238 | return -1; |
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| 239 | } |
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| 240 | } |
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| 241 | return 1; |
259 | return 1; |
| 242 | } |
260 | } |
| 243 | |
261 | |
| 244 | /* recursive routine which will fill every available space in the maze |
262 | /* recursive routine which will fill every available space in the maze |
| 245 | with walls*/ |
263 | with walls*/ |
| 246 | |
264 | |
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265 | void |
| 247 | void fill_maze_full(char **maze, int x, int y, int xsize, int ysize ) { |
266 | fill_maze_full (char **maze, int x, int y, int xsize, int ysize) |
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267 | { |
| 248 | int xc,yc; |
268 | int xc, yc; |
| 249 | |
269 | |
| 250 | /* write a wall here */ |
270 | /* write a wall here */ |
| 251 | maze[x][y] = '#'; |
271 | maze[x][y] = '#'; |
| 252 | |
272 | |
| 253 | /* 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 */ |
| 254 | if(RANDOM()%4 && wall_free_size > 0) { |
274 | if (rndm (4) && wall_free_size > 0) |
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275 | { |
| 255 | pop_wall_point(&xc,&yc); |
276 | pop_wall_point (&xc, &yc); |
| 256 | fill_maze_full(maze,xc,yc,xsize,ysize); |
277 | fill_maze_full (maze, xc, yc, xsize, ysize); |
| 257 | } |
278 | } |
| 258 | |
279 | |
| 259 | /* change the if to a while for a complete maze. */ |
280 | /* change the if to a while for a complete maze. */ |
| 260 | while(find_free_point(maze,&xc,&yc,x,y,xsize,ysize)!=-1) { |
281 | while (find_free_point (maze, &xc, &yc, x, y, xsize, ysize) != -1) |
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282 | { |
| 261 | fill_maze_full(maze,xc,yc,xsize,ysize); |
283 | fill_maze_full (maze, xc, yc, xsize, ysize); |
| 262 | } |
284 | } |
| 263 | } |
285 | } |
| 264 | |
286 | |
| 265 | |
287 | |
| 266 | /* recursive routine which will fill much of the maze, but will leave |
288 | /* recursive routine which will fill much of the maze, but will leave |
| 267 | some free spots (possibly large) toward the center.*/ |
289 | some free spots (possibly large) toward the center.*/ |
| 268 | |
290 | |
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291 | void |
| 269 | void fill_maze_sparse(char **maze, int x, int y, int xsize, int ysize ) { |
292 | fill_maze_sparse (char **maze, int x, int y, int xsize, int ysize) |
|
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293 | { |
| 270 | int xc,yc; |
294 | int xc, yc; |
| 271 | |
295 | |
| 272 | /* write a wall here */ |
296 | /* write a wall here */ |
| 273 | maze[x][y] = '#'; |
297 | maze[x][y] = '#'; |
| 274 | |
298 | |
| 275 | /* 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 */ |
| 276 | if(RANDOM()%4 && wall_free_size > 0) { |
300 | if (rndm (4) && wall_free_size > 0) |
|
|
301 | { |
| 277 | pop_wall_point(&xc,&yc); |
302 | pop_wall_point (&xc, &yc); |
| 278 | fill_maze_sparse(maze,xc,yc,xsize,ysize); |
303 | fill_maze_sparse (maze, xc, yc, xsize, ysize); |
| 279 | } |
304 | } |
| 280 | |
305 | |
| 281 | /* change the if to a while for a complete maze. */ |
306 | /* change the if to a while for a complete maze. */ |
| 282 | if(find_free_point(maze,&xc,&yc,x,y,xsize,ysize)!=-1) { |
307 | if (find_free_point (maze, &xc, &yc, x, y, xsize, ysize) != -1) |
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308 | { |
| 283 | fill_maze_sparse(maze,xc,yc,xsize,ysize); |
309 | fill_maze_sparse (maze, xc, yc, xsize, ysize); |
| 284 | } |
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| 285 | } |
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| 286 | |
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| 287 | |
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| 288 | |
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| 289 | |
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| 290 | |
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| 291 | |
310 | } |
| 292 | |
311 | } |
| 293 | |
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