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1 | /* |
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2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
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3 | * |
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4 | * Copyright (©) 2005,2006,2007,2008,2009 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
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5 | * Copyright (©) Crossfire Development Team (restored, original file without copyright notice) |
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6 | * |
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7 | * Deliantra is free software: you can redistribute it and/or modify it under |
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8 | * the terms of the Affero GNU General Public License as published by the |
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9 | * Free Software Foundation, either version 3 of the License, or (at your |
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10 | * option) any later version. |
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11 | * |
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12 | * This program is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | * GNU General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the Affero GNU General Public License |
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18 | * and the GNU General Public License along with this program. If not, see |
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19 | * <http://www.gnu.org/licenses/>. |
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20 | * |
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21 | * The authors can be reached via e-mail to <support@deliantra.net> |
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22 | */ |
| 1 | |
23 | |
| 2 | /* peterm@langmuir.eecs.berkeley.edu: this function generates a random |
24 | /* peterm@langmuir.eecs.berkeley.edu: this function generates a random |
| 3 | blocked maze with the property that there is only one path from one spot |
25 | blocked maze with the property that there is only one path from one spot |
| 4 | to any other, and there is always a path from one spot to any other. |
26 | to any other, and there is always a path from one spot to any other. |
| 5 | |
27 | |
| … | |
… | |
| 13 | |
35 | |
| 14 | /* we need to maintain a list of wall points to generate |
36 | /* we need to maintain a list of wall points to generate |
| 15 | reasonable mazes: a straightforward recursive random walk maze |
37 | reasonable mazes: a straightforward recursive random walk maze |
| 16 | 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 */ |
| 17 | |
39 | |
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40 | #include <vector> |
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41 | |
| 18 | #include <global.h> |
42 | #include <global.h> |
| 19 | |
43 | |
| 20 | #include "random_map.h" |
44 | #include "random_map.h" |
| 21 | #include "rproto.h" |
45 | #include "rproto.h" |
| 22 | |
46 | |
| 23 | /* global variables that everyone needs: don't want to pass them in |
47 | /* global variables that everyone needs: don't want to pass them in |
| 24 | as parameters every time. */ |
48 | as parameters every time. */ |
| 25 | static int *wall_x_list = 0; |
49 | static fixed_stack<point> seeds; |
| 26 | static int *wall_y_list = 0; |
50 | static int xsize, ysize; |
| 27 | static int wall_free_size = 0; |
51 | static char **maze; |
| 28 | |
52 | |
| 29 | /* heuristically, we need to change wall_chance based on the size of |
53 | static void |
| 30 | the maze. */ |
54 | push (point p) |
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55 | { |
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56 | seeds.push (p); |
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57 | maze [p.x][p.y] = '#'; |
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58 | } |
| 31 | |
59 | |
| 32 | static int wall_chance; |
60 | /* randomly returns one of the elements from the wall point list */ |
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61 | static point |
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62 | pop_rand () |
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63 | { |
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64 | return seeds.remove (rmg_rndm (seeds.size)); |
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65 | } |
| 33 | |
66 | |
| 34 | /* the free wall points are those outer points which aren't corners or |
67 | /* the free wall points are those outer points which aren't corners or |
| 35 | near corners, and don't have a maze wall growing out of them already. */ |
68 | near corners, and don't have a maze wall growing out of them already. */ |
| 36 | static void |
69 | static void |
| 37 | make_wall_free_list (int xsize, int ysize) |
70 | push_walls () |
| 38 | { |
71 | { |
| 39 | int i, j, count; |
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| 40 | |
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| 41 | count = 0; /* entries already placed in the free list */ |
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| 42 | /*allocate it */ |
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| 43 | if (wall_free_size < 0) |
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| 44 | return; |
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| 45 | |
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| 46 | wall_x_list = (int *)calloc (sizeof (int), wall_free_size); |
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| 47 | wall_y_list = (int *)calloc (sizeof (int), wall_free_size); |
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| 48 | |
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| 49 | /* top and bottom wall */ |
72 | /* top and bottom wall */ |
| 50 | for (i = 2; i < xsize - 2; i++) |
73 | for (int x = 2; x < xsize - 2; x++) |
| 51 | { |
74 | { |
| 52 | wall_x_list[count] = i; |
75 | push (point (x, 0)); |
| 53 | wall_y_list[count] = 0; |
76 | push (point (x, ysize - 1)); |
| 54 | count++; |
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| 55 | wall_x_list[count] = i; |
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| 56 | wall_y_list[count] = ysize - 1; |
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| 57 | count++; |
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| 58 | } |
77 | } |
| 59 | |
78 | |
| 60 | /* left and right wall */ |
79 | /* left and right wall */ |
| 61 | for (j = 2; j < ysize - 2; j++) |
80 | for (int y = 2; y < ysize - 2; y++) |
| 62 | { |
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| 63 | wall_x_list[count] = 0; |
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| 64 | wall_y_list[count] = j; |
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| 65 | count++; |
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| 66 | wall_x_list[count] = xsize - 1; |
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| 67 | wall_y_list[count] = j; |
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| 68 | count++; |
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| 69 | } |
81 | { |
| 70 | } |
82 | push (point ( 0, y)); |
| 71 | |
83 | push (point (xsize - 1, y)); |
| 72 | /* randomly returns one of the elements from the wall point list */ |
84 | } |
| 73 | static void |
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| 74 | pop_wall_point (int *x, int *y) |
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| 75 | { |
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| 76 | int index = rmg_rndm (wall_free_size); |
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| 77 | |
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| 78 | *x = wall_x_list[index]; |
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| 79 | *y = wall_y_list[index]; |
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| 80 | /* write the last array point here */ |
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| 81 | wall_x_list[index] = wall_x_list[wall_free_size - 1]; |
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| 82 | wall_y_list[index] = wall_y_list[wall_free_size - 1]; |
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| 83 | wall_free_size--; |
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| 84 | } |
85 | } |
| 85 | |
86 | |
| 86 | /* find free point: randomly look for a square adjacent to this one where |
87 | /* find free point: randomly look for a square adjacent to this one where |
| 87 | we can place a new block without closing a path. We may only look |
88 | we can place a new block without closing a path. We may only look |
| 88 | up, down, right, or left. */ |
89 | up, down, right, or left. */ |
| 89 | static int |
90 | static int |
| 90 | find_free_point (char **maze, int *x, int *y, int xc, int yc, int xsize, int ysize) |
91 | find_free_point (point &p, point pc) |
| 91 | { |
92 | { |
| 92 | /* we will randomly pick from this list, 1=up,2=down,3=right,4=left */ |
93 | /* we will randomly pick from this list, 1=up,2=down,3=right,4=left */ |
| 93 | int dirlist[4]; |
94 | int dirlist[4]; |
| 94 | int count = 0; /* # elements in dirlist */ |
95 | int count = 0; /* # elements in dirlist */ |
| 95 | |
96 | |
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97 | int xc = pc.x; |
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98 | int yc = pc.y; |
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99 | |
| 96 | /* look up */ |
100 | /* look up */ |
| 97 | if (yc < ysize - 2 && xc > 2 && xc < xsize - 2) /* it is valid to look up */ |
101 | if (yc < ysize - 2 && xc > 2 && xc < xsize - 2) /* it is valid to look up */ |
| 98 | { |
102 | { |
| 99 | int cleartest = (int) maze[xc][yc + 1] + (int) maze[xc - 1][yc + 1] + (int) maze[xc + 1][yc + 1]; |
103 | int cleartest = maze[xc][yc + 1] + maze[xc - 1][yc + 1] + maze[xc + 1][yc + 1] |
| 100 | |
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| 101 | cleartest += (int) maze[xc][yc + 2] + (int) maze[xc - 1][yc + 2] + (int) maze[xc + 1][yc + 2]; |
104 | + maze[xc][yc + 2] + maze[xc - 1][yc + 2] + maze[xc + 1][yc + 2]; |
| 102 | |
105 | |
| 103 | if (cleartest == 0) |
106 | if (cleartest == 0) |
| 104 | dirlist[count++] = 1; |
107 | dirlist[count++] = 1; |
| 105 | } |
108 | } |
| 106 | |
109 | |
| 107 | /* look down */ |
110 | /* look down */ |
| 108 | if (yc > 2 && xc > 2 && xc < xsize - 2) /* it is valid to look down */ |
111 | if (yc > 2 && xc > 2 && xc < xsize - 2) /* it is valid to look down */ |
| 109 | { |
112 | { |
| 110 | int cleartest = (int) maze[xc][yc - 1] + (int) maze[xc - 1][yc - 1] + (int) maze[xc + 1][yc - 1]; |
113 | int cleartest = maze[xc][yc - 1] + maze[xc - 1][yc - 1] + maze[xc + 1][yc - 1] |
| 111 | |
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| 112 | cleartest += (int) maze[xc][yc - 2] + (int) maze[xc - 1][yc - 2] + (int) maze[xc + 1][yc - 2]; |
114 | + maze[xc][yc - 2] + maze[xc - 1][yc - 2] + maze[xc + 1][yc - 2]; |
| 113 | |
115 | |
| 114 | if (cleartest == 0) |
116 | if (cleartest == 0) |
| 115 | dirlist[count++] = 2; |
117 | dirlist[count++] = 2; |
| 116 | } |
118 | } |
| 117 | |
119 | |
| 118 | /* look right */ |
120 | /* look right */ |
| 119 | if (xc < xsize - 2 && yc > 2 && yc < ysize - 2) /* it is valid to look left */ |
121 | if (xc < xsize - 2 && yc > 2 && yc < ysize - 2) /* it is valid to look left */ |
| 120 | { |
122 | { |
| 121 | int cleartest = (int) maze[xc + 1][yc] + (int) maze[xc + 1][yc - 1] + (int) maze[xc + 1][yc + 1]; |
123 | int cleartest = maze[xc + 1][yc] + maze[xc + 1][yc - 1] + maze[xc + 1][yc + 1] |
| 122 | |
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| 123 | cleartest += (int) maze[xc + 2][yc] + (int) maze[xc + 2][yc - 1] + (int) maze[xc + 2][yc + 1]; |
124 | + maze[xc + 2][yc] + maze[xc + 2][yc - 1] + maze[xc + 2][yc + 1]; |
| 124 | |
125 | |
| 125 | if (cleartest == 0) |
126 | if (cleartest == 0) |
| 126 | dirlist[count++] = 3; |
127 | dirlist[count++] = 3; |
| 127 | } |
128 | } |
| 128 | |
129 | |
| 129 | /* look left */ |
130 | /* look left */ |
| 130 | if (xc > 2 && yc > 2 && yc < ysize - 2) /* it is valid to look down */ |
131 | if (xc > 2 && yc > 2 && yc < ysize - 2) /* it is valid to look down */ |
| 131 | { |
132 | { |
| 132 | int cleartest = (int) maze[xc - 1][yc] + (int) maze[xc - 1][yc - 1] + (int) maze[xc - 1][yc + 1]; |
133 | int cleartest = maze[xc - 1][yc] + maze[xc - 1][yc - 1] + maze[xc - 1][yc + 1] |
| 133 | |
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| 134 | cleartest += (int) maze[xc - 2][yc] + (int) maze[xc - 2][yc - 1] + (int) maze[xc - 2][yc + 1]; |
134 | + maze[xc - 2][yc] + maze[xc - 2][yc - 1] + maze[xc - 2][yc + 1]; |
| 135 | |
135 | |
| 136 | if (cleartest == 0) |
136 | if (cleartest == 0) |
| 137 | dirlist[count++] = 4; |
137 | dirlist[count++] = 4; |
| 138 | } |
138 | } |
| 139 | |
139 | |
| … | |
… | |
| 142 | |
142 | |
| 143 | /* choose a random direction */ |
143 | /* choose a random direction */ |
| 144 | switch (dirlist [rmg_rndm (count)]) |
144 | switch (dirlist [rmg_rndm (count)]) |
| 145 | { |
145 | { |
| 146 | case 1: /* up */ |
146 | case 1: /* up */ |
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147 | p.x = xc; |
| 147 | *y = yc + 1; |
148 | p.y = yc + 1; |
| 148 | *x = xc; |
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| 149 | break; |
149 | break; |
| 150 | |
150 | |
| 151 | case 2: /* down */ |
151 | case 2: /* down */ |
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152 | p.x = xc; |
| 152 | *y = yc - 1; |
153 | p.y = yc - 1; |
| 153 | *x = xc; |
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| 154 | break; |
154 | break; |
| 155 | |
155 | |
| 156 | case 3: /* right */ |
156 | case 3: /* right */ |
| 157 | *y = yc; |
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| 158 | *x = xc + 1; |
157 | p.x = xc + 1; |
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158 | p.y = yc; |
| 159 | break; |
159 | break; |
| 160 | |
160 | |
| 161 | case 4: /* left */ |
161 | case 4: /* left */ |
| 162 | *x = xc - 1; |
162 | p.x = xc - 1; |
| 163 | *y = yc; |
163 | p.y = yc; |
| 164 | break; |
164 | break; |
| 165 | |
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| 166 | default: /* ??? */ |
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| 167 | return -1; |
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| 168 | |
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| 169 | } |
165 | } |
| 170 | |
166 | |
| 171 | return 1; |
167 | return 1; |
| 172 | } |
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| 173 | |
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| 174 | /* recursive routine which will fill every available space in the maze |
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| 175 | with walls*/ |
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| 176 | static void |
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| 177 | fill_maze_full (char **maze, int x, int y, int xsize, int ysize) |
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| 178 | { |
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| 179 | int xc, yc; |
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| 180 | |
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| 181 | /* write a wall here */ |
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| 182 | maze[x][y] = '#'; |
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| 183 | |
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| 184 | /* decide if we're going to pick from the wall_free_list */ |
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| 185 | if (rmg_rndm (4) && wall_free_size > 0) |
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| 186 | { |
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| 187 | pop_wall_point (&xc, &yc); |
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| 188 | fill_maze_full (maze, xc, yc, xsize, ysize); |
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| 189 | } |
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| 190 | |
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| 191 | /* change the if to a while for a complete maze. */ |
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| 192 | while (find_free_point (maze, &xc, &yc, x, y, xsize, ysize) != -1) |
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| 193 | fill_maze_full (maze, xc, yc, xsize, ysize); |
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| 194 | } |
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| 195 | |
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| 196 | /* recursive routine which will fill much of the maze, but will leave |
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| 197 | some free spots (possibly large) toward the center.*/ |
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| 198 | static void |
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| 199 | fill_maze_sparse (char **maze, int x, int y, int xsize, int ysize) |
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| 200 | { |
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| 201 | int xc, yc; |
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| 202 | |
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| 203 | /* write a wall here */ |
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| 204 | maze[x][y] = '#'; |
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| 205 | |
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| 206 | /* decide if we're going to pick from the wall_free_list */ |
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| 207 | if (rmg_rndm (4) && wall_free_size > 0) |
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| 208 | { |
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| 209 | pop_wall_point (&xc, &yc); |
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| 210 | fill_maze_sparse (maze, xc, yc, xsize, ysize); |
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| 211 | } |
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| 212 | |
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| 213 | /* change the if to a while for a complete maze. */ |
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| 214 | if (find_free_point (maze, &xc, &yc, x, y, xsize, ysize) != -1) |
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| 215 | fill_maze_sparse (maze, xc, yc, xsize, ysize); |
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| 216 | } |
168 | } |
| 217 | |
169 | |
| 218 | /* the outsize interface routine: accepts sizes, returns a char |
170 | /* the outsize interface routine: accepts sizes, returns a char |
| 219 | ** maze. option is a flag for either a sparse or a full maze. Sparse |
171 | ** maze. option is a flag for either a sparse or a full maze. Sparse |
| 220 | mazes have sizable rooms. option = 1, full, 0, sparse.*/ |
172 | mazes have sizable rooms. option = 3=full, 2=braided, 1=sparse, 0=rooms.*/ |
| 221 | void |
173 | void |
| 222 | maze_gen (Layout maze, int option) |
174 | maze_gen (Layout maze, int subtype) |
| 223 | { |
175 | { |
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176 | xsize = maze->w; |
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177 | ysize = maze->h; |
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178 | ::maze = maze; |
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179 | |
| 224 | maze->clear (); |
180 | maze->clear (); |
| 225 | maze->border (); |
181 | maze->border (); |
| 226 | |
182 | |
| 227 | /* find how many free wall spots there are */ |
183 | if (xsize < 4 || ysize < 4) |
| 228 | wall_free_size = 2 * (maze->w - 4) + 2 * (maze->h - 4); |
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| 229 | |
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| 230 | make_wall_free_list (maze->w, maze->h); |
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| 231 | |
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| 232 | /* return the empty maze */ |
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| 233 | if (wall_free_size <= 0) |
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| 234 | return; |
184 | return; |
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185 | |
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186 | seeds.reset (xsize * ysize); |
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187 | |
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188 | if (subtype > 0) |
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189 | push_walls (); |
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190 | |
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191 | if (subtype == 0 || subtype == 2) |
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192 | for (int i = (xsize + ysize) / 2; i; --i) |
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193 | push (point (rmg_rndm (1, xsize - 2), rmg_rndm (1, ysize - 2))); |
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194 | |
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195 | bool full = subtype == 3; |
| 235 | |
196 | |
| 236 | /* recursively generate the walls of the maze */ |
197 | /* recursively generate the walls of the maze */ |
| 237 | /* first pop a random starting point */ |
198 | /* first pop a random starting point */ |
| 238 | while (wall_free_size > 0) |
199 | while (seeds.size) |
| 239 | { |
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| 240 | int i, j; |
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| 241 | |
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| 242 | pop_wall_point (&i, &j); |
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| 243 | |
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| 244 | if (option) |
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| 245 | fill_maze_full (maze, i, j, maze->w, maze->h); |
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| 246 | else |
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| 247 | fill_maze_sparse (maze, i, j, maze->w, maze->h); |
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| 248 | } |
200 | { |
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201 | point p = pop_rand (); |
| 249 | |
202 | |
| 250 | /* clean up our intermediate data structures. */ |
203 | for (;;) |
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204 | { |
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205 | point pc; |
| 251 | |
206 | |
| 252 | free (wall_x_list); |
207 | maze [p.x][p.y] = '#'; |
| 253 | free (wall_y_list); |
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| 254 | } |
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| 255 | |
208 | |
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209 | if (find_free_point (pc, p) < 0) |
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210 | break; |
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211 | |
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212 | if (full) |
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213 | push (p); |
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214 | |
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215 | if (!rmg_rndm (8)) |
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216 | { |
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217 | if (!full) |
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218 | push (pc); |
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219 | |
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220 | break; |
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221 | } |
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222 | |
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223 | p = pc; |
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224 | } |
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225 | } |
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226 | |
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227 | seeds.free (); |
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228 | } |
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229 | |
