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