Commit | Line | Data |
---|---|---|
debaffdd SK |
1 | open Printf |
2 | ||
3 | ||
4 | (* ------------------------------------------------------------------------- * | |
5 | * Constants | |
6 | * ------------------------------------------------------------------------- *) | |
8143820a SK |
7 | let default_f = 0.01 (* Probability of spontaneous ignition *) |
8 | let default_p = 1.0 (* Probability of spontaneous growth *) | |
debaffdd SK |
9 | |
10 | let default_x = 80 | |
11 | let default_y = 25 | |
12 | ||
13 | let char_empty = ' ' | |
14 | let char_tree = 'T' | |
15 | let char_burning = '#' | |
16 | ||
17 | let ansi_color_tree = "\027[0;32m" (* Green *) | |
18 | let ansi_color_burning = "\027[1;31m" (* Red *) | |
19 | let ansi_color_off = "\027[0m" | |
20 | ||
21 | let ansi_code_clear = "\027[2J" (* Clear screen *) | |
22 | let ansi_code_reset = "\027[1;1H" (* Reset cursor position *) | |
23 | ||
24 | ||
25 | (* ------------------------------------------------------------------------- * | |
26 | * Types | |
27 | * ------------------------------------------------------------------------- *) | |
28 | type cell_state = | |
29 | | Empty | Tree | Burning | |
30 | ||
31 | ||
32 | type direction = | |
33 | | N | NE | E | SE | S | SW | W | NW | |
34 | ||
35 | ||
36 | type options = | |
37 | { size : int * int | |
8143820a | 38 | ; prob : float * float |
debaffdd SK |
39 | } |
40 | ||
41 | ||
42 | (* ------------------------------------------------------------------------- * | |
43 | * Utils | |
44 | * ------------------------------------------------------------------------- *) | |
45 | ||
46 | (* Hack to sleep less than 1 sec *) | |
47 | let minisleep subsec = | |
48 | ignore (Unix.select [] [] [] subsec) | |
49 | ||
50 | ||
51 | let term_clear () = | |
52 | print_string ansi_code_clear | |
53 | ||
54 | ||
55 | let term_reset () = | |
56 | print_string ansi_code_reset | |
57 | ||
58 | ||
59 | let get_opts argv = | |
60 | let usage = "" | |
61 | ||
8143820a SK |
62 | and f = ref default_f |
63 | and p = ref default_p | |
debaffdd SK |
64 | and x = ref default_x |
65 | and y = ref default_y in | |
66 | ||
8143820a SK |
67 | let speclist = |
68 | Arg.align | |
69 | [ ("-f", Arg.Set_float f, " Probability of spontaneous ignition.") | |
70 | ; ("-p", Arg.Set_float p, " Probability of spontaneous growth.") | |
71 | ; ("-x", Arg.Set_int x, " Forest width.") | |
72 | ; ("-y", Arg.Set_int y, " Forest height.") | |
73 | ] | |
74 | in | |
debaffdd SK |
75 | |
76 | Arg.parse speclist (fun _ -> ()) usage; | |
77 | ||
78 | { size = !x, !y | |
8143820a | 79 | ; prob = !f, !p |
debaffdd SK |
80 | } |
81 | ||
82 | ||
83 | (* ------------------------------------------------------------------------- * | |
84 | * Core | |
85 | * ------------------------------------------------------------------------- *) | |
86 | let directions = | |
87 | [N; NE; E; SE; S; SW; W; NW] | |
88 | ||
89 | ||
90 | let offset_of_direction = function | |
91 | (* Direction -> x, y *) | |
92 | | N -> 0, -1 | |
93 | | NE -> 1, -1 | |
94 | | E -> 1, 0 | |
95 | | SE -> 1, 1 | |
96 | | S -> 0, 1 | |
97 | | SW -> -1, 1 | |
98 | | W -> -1, 0 | |
99 | | NW -> -1, -1 | |
100 | ||
101 | ||
102 | let offsets = | |
103 | List.map (offset_of_direction) directions | |
104 | ||
105 | ||
106 | let is_probable = function | |
107 | | probability when (Random.float 1.0) <= probability -> true | |
108 | | _ -> false | |
109 | ||
110 | ||
8143820a | 111 | let init_cell_state (_, p) = function |
debaffdd SK |
112 | | () when is_probable p -> Tree |
113 | | () -> Empty | |
114 | ||
115 | ||
8143820a SK |
116 | let init_forest (x, y) prob = |
117 | Array.map (Array.map (init_cell_state prob)) (Array.make_matrix y x ()) | |
debaffdd SK |
118 | |
119 | ||
120 | let string_of_state = function | |
121 | | Empty -> sprintf "%c" char_empty | |
122 | | Tree -> sprintf "%s%c%s" ansi_color_tree char_tree ansi_color_off | |
123 | | Burning -> sprintf "%s%c%s" ansi_color_burning char_burning ansi_color_off | |
124 | ||
125 | ||
126 | let new_state = function | |
8143820a SK |
127 | | Burning, _, _ -> Empty |
128 | | Tree, 0, (f, _) when is_probable f -> Burning | |
129 | | Tree, n_burning, _ when n_burning > 0 -> Burning | |
130 | | Empty, _, (_, p) when is_probable p -> Tree | |
131 | | state, _, _ -> state | |
debaffdd SK |
132 | |
133 | ||
134 | let print_forest forest = | |
135 | Array.iter | |
136 | ( | |
137 | fun row -> | |
138 | Array.iter | |
139 | ( | |
140 | fun state -> | |
141 | print_string (string_of_state state) | |
142 | ) | |
143 | row; | |
144 | print_newline () | |
145 | ) | |
146 | forest | |
147 | ||
148 | ||
149 | let is_onside width height (x, y) = | |
150 | x >= 0 && y >= 0 && x < width && y < height | |
151 | ||
152 | ||
8143820a | 153 | let next_generation forest (width, height) prob = |
debaffdd SK |
154 | Array.mapi |
155 | ( | |
156 | fun iy row -> | |
157 | Array.mapi | |
158 | ( | |
159 | fun ix state -> | |
160 | let neighbors = List.map (fun (ox, oy) -> ox + ix, oy + iy) offsets in | |
161 | let neighbors = List.filter (is_onside width height) neighbors in | |
162 | let neighbor_states = List.map (fun (x, y) -> forest.(y).(x)) neighbors in | |
163 | let burning_states = List.filter (fun s -> s == Burning) neighbor_states in | |
8143820a | 164 | new_state (state, (List.length burning_states), prob) |
debaffdd SK |
165 | ) |
166 | row | |
167 | ) | |
168 | forest | |
169 | ||
170 | ||
8143820a | 171 | let rec burn forest size prob = |
debaffdd SK |
172 | term_reset (); |
173 | print_forest forest; | |
174 | minisleep 0.1; | |
8143820a | 175 | burn (next_generation forest size prob) size prob |
debaffdd SK |
176 | |
177 | ||
178 | let main argv = | |
179 | Random.self_init (); | |
180 | ||
181 | let opts = get_opts argv in | |
8143820a | 182 | let forest = init_forest opts.size opts.prob in |
debaffdd SK |
183 | |
184 | term_clear (); | |
8143820a | 185 | burn forest opts.size opts.prob |
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186 | |
187 | ||
188 | let () = main Sys.argv |