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1a06eabd ER |
1 | ;;; gomoku.el --- Gomoku game between you and Emacs |
2 | ||
f5ecf0c9 | 3 | ;; Copyright (C) 1988, 1994, 1996 Free Software Foundation, Inc. |
3a801d0c | 4 | |
2b38b487 | 5 | ;; Author: Philippe Schnoebelen <phs@lsv.ens-cachan.fr> |
d7ab2718 | 6 | ;; Adapted-By: ESR, Daniel.Pfeiffer@Informatik.START.dbp.de |
e5167999 ER |
7 | ;; Keywords: games |
8 | ||
a2535589 JA |
9 | ;; This file is part of GNU Emacs. |
10 | ||
11 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
12 | ;; it under the terms of the GNU General Public License as published by | |
e5167999 | 13 | ;; the Free Software Foundation; either version 2, or (at your option) |
a2535589 JA |
14 | ;; any later version. |
15 | ||
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
23 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
24 | ;; Boston, MA 02111-1307, USA. | |
a2535589 | 25 | |
e5167999 ER |
26 | ;;; Commentary: |
27 | ||
a2535589 JA |
28 | ;; RULES: |
29 | ;; | |
30 | ;; Gomoku is a game played between two players on a rectangular board. Each | |
31 | ;; player, in turn, marks a free square of its choice. The winner is the first | |
32 | ;; one to mark five contiguous squares in any direction (horizontally, | |
33 | ;; vertically or diagonally). | |
34 | ;; | |
35 | ;; I have been told that, in "The TRUE Gomoku", some restrictions are made | |
36 | ;; about the squares where one may play, or else there is a known forced win | |
37 | ;; for the first player. This program has no such restriction, but it does not | |
38 | ;; know about the forced win, nor do I. Furthermore, you probably do not know | |
39 | ;; it yourself :-). | |
40 | ||
41 | ||
a2535589 JA |
42 | ;; There are two main places where you may want to customize the program: key |
43 | ;; bindings and board display. These features are commented in the code. Go | |
44 | ;; and see. | |
45 | ||
46 | ||
47 | ;; HOW TO USE: | |
48 | ;; | |
d9a7a8f5 | 49 | ;; The command "M-x gomoku" displays a |
a2535589 JA |
50 | ;; board, the size of which depends on the size of the current window. The |
51 | ;; size of the board is easily modified by giving numeric arguments to the | |
52 | ;; gomoku command and/or by customizing the displaying parameters. | |
53 | ;; | |
54 | ;; Emacs plays when it is its turn. When it is your turn, just put the cursor | |
55 | ;; on the square where you want to play and hit RET, or X, or whatever key you | |
56 | ;; bind to the command gomoku-human-plays. When it is your turn, Emacs is | |
57 | ;; idle: you may switch buffers, read your mail, ... Just come back to the | |
58 | ;; *Gomoku* buffer and resume play. | |
59 | ||
60 | ||
61 | ;; ALGORITHM: | |
62 | ;; | |
63 | ;; The algorithm is briefly described in section "THE SCORE TABLE". Some | |
64 | ;; parameters may be modified if you want to change the style exhibited by the | |
65 | ;; program. | |
e5167999 ER |
66 | |
67 | ;;; Code: | |
a2535589 | 68 | \f |
323f7c49 SE |
69 | (defgroup gomoku nil |
70 | "Gomoku game between you and Emacs." | |
71 | :prefix "gomoku-" | |
72 | :group 'games) | |
a2535589 JA |
73 | ;;; |
74 | ;;; GOMOKU MODE AND KEYMAP. | |
75 | ;;; | |
323f7c49 SE |
76 | (defcustom gomoku-mode-hook nil |
77 | "If non-nil, its value is called on entry to Gomoku mode. | |
78 | One useful value to include is `turn-on-font-lock' to highlight the pieces." | |
79 | :type 'hook | |
80 | :group 'gomoku) | |
a2535589 JA |
81 | |
82 | (defvar gomoku-mode-map nil | |
83 | "Local keymap to use in Gomoku mode.") | |
84 | ||
85 | (if gomoku-mode-map nil | |
86 | (setq gomoku-mode-map (make-sparse-keymap)) | |
87 | ||
f5ecf0c9 RS |
88 | ;; Key bindings for cursor motion. |
89 | (define-key gomoku-mode-map "y" 'gomoku-move-nw) ; y | |
90 | (define-key gomoku-mode-map "u" 'gomoku-move-ne) ; u | |
91 | (define-key gomoku-mode-map "b" 'gomoku-move-sw) ; b | |
92 | (define-key gomoku-mode-map "n" 'gomoku-move-se) ; n | |
93 | (define-key gomoku-mode-map "h" 'backward-char) ; h | |
94 | (define-key gomoku-mode-map "l" 'forward-char) ; l | |
95 | (define-key gomoku-mode-map "j" 'gomoku-move-down) ; j | |
96 | (define-key gomoku-mode-map "k" 'gomoku-move-up) ; k | |
97 | ||
98 | (define-key gomoku-mode-map [kp-7] 'gomoku-move-nw) | |
99 | (define-key gomoku-mode-map [kp-9] 'gomoku-move-ne) | |
100 | (define-key gomoku-mode-map [kp-1] 'gomoku-move-sw) | |
101 | (define-key gomoku-mode-map [kp-3] 'gomoku-move-se) | |
102 | (define-key gomoku-mode-map [kp-4] 'backward-char) | |
103 | (define-key gomoku-mode-map [kp-6] 'forward-char) | |
104 | (define-key gomoku-mode-map [kp-2] 'gomoku-move-down) | |
105 | (define-key gomoku-mode-map [kp-8] 'gomoku-move-up) | |
106 | ||
107 | (define-key gomoku-mode-map "\C-n" 'gomoku-move-down) ; C-n | |
108 | (define-key gomoku-mode-map "\C-p" 'gomoku-move-up) ; C-p | |
a2535589 JA |
109 | |
110 | ;; Key bindings for entering Human moves. | |
a2535589 JA |
111 | (define-key gomoku-mode-map "X" 'gomoku-human-plays) ; X |
112 | (define-key gomoku-mode-map "x" 'gomoku-human-plays) ; x | |
f201b69e | 113 | (define-key gomoku-mode-map " " 'gomoku-human-plays) ; SPC |
a2535589 | 114 | (define-key gomoku-mode-map "\C-m" 'gomoku-human-plays) ; RET |
f5ecf0c9 RS |
115 | (define-key gomoku-mode-map "\C-c\C-p" 'gomoku-human-plays) ; C-c C-p |
116 | (define-key gomoku-mode-map "\C-c\C-b" 'gomoku-human-takes-back) ; C-c C-b | |
117 | (define-key gomoku-mode-map "\C-c\C-r" 'gomoku-human-resigns) ; C-c C-r | |
118 | (define-key gomoku-mode-map "\C-c\C-e" 'gomoku-emacs-plays) ; C-c C-e | |
119 | ||
e8a57935 | 120 | (define-key gomoku-mode-map [kp-enter] 'gomoku-human-plays) |
f5ecf0c9 | 121 | (define-key gomoku-mode-map [insert] 'gomoku-human-plays) |
d7ab2718 RS |
122 | (define-key gomoku-mode-map [down-mouse-1] 'gomoku-click) |
123 | (define-key gomoku-mode-map [drag-mouse-1] 'gomoku-click) | |
124 | (define-key gomoku-mode-map [mouse-1] 'gomoku-click) | |
125 | (define-key gomoku-mode-map [down-mouse-2] 'gomoku-click) | |
126 | (define-key gomoku-mode-map [mouse-2] 'gomoku-mouse-play) | |
127 | (define-key gomoku-mode-map [drag-mouse-2] 'gomoku-mouse-play) | |
f5ecf0c9 RS |
128 | |
129 | (substitute-key-definition 'previous-line 'gomoku-move-up | |
130 | gomoku-mode-map (current-global-map)) | |
131 | (substitute-key-definition 'next-line 'gomoku-move-down | |
132 | gomoku-mode-map (current-global-map)) | |
d7ab2718 RS |
133 | (substitute-key-definition 'beginning-of-line 'gomoku-beginning-of-line |
134 | gomoku-mode-map (current-global-map)) | |
135 | (substitute-key-definition 'end-of-line 'gomoku-end-of-line | |
136 | gomoku-mode-map (current-global-map)) | |
f5ecf0c9 RS |
137 | (substitute-key-definition 'undo 'gomoku-human-takes-back |
138 | gomoku-mode-map (current-global-map)) | |
139 | (substitute-key-definition 'advertised-undo 'gomoku-human-takes-back | |
140 | gomoku-mode-map (current-global-map))) | |
141 | ||
142 | (defvar gomoku-emacs-won () | |
323f7c49 | 143 | "For making font-lock use the winner's face for the line.") |
f5ecf0c9 | 144 | |
323f7c49 | 145 | (defcustom gomoku-font-lock-O-face |
f5ecf0c9 RS |
146 | (if window-system |
147 | (list (facemenu-get-face 'fg:red) 'bold)) | |
323f7c49 SE |
148 | "*Face to use for Emacs' O." |
149 | :type '(repeat face) | |
150 | :group 'gomoku) | |
f5ecf0c9 | 151 | |
323f7c49 | 152 | (defcustom gomoku-font-lock-X-face |
f5ecf0c9 RS |
153 | (if window-system |
154 | (list (facemenu-get-face 'fg:green) 'bold)) | |
323f7c49 SE |
155 | "*Face to use for your X." |
156 | :type '(repeat face) | |
157 | :group 'gomoku) | |
f5ecf0c9 RS |
158 | |
159 | (defvar gomoku-font-lock-keywords | |
160 | '(("O" . gomoku-font-lock-O-face) | |
161 | ("X" . gomoku-font-lock-X-face) | |
162 | ("[-|/\\]" 0 (if gomoku-emacs-won | |
163 | gomoku-font-lock-O-face | |
164 | gomoku-font-lock-X-face))) | |
165 | "*Font lock rules for Gomoku.") | |
166 | ||
167 | (put 'gomoku-mode 'front-sticky | |
168 | (put 'gomoku-mode 'rear-nonsticky '(intangible))) | |
d7ab2718 | 169 | (put 'gomoku-mode 'intangible 1) |
a2535589 JA |
170 | |
171 | (defun gomoku-mode () | |
172 | "Major mode for playing Gomoku against Emacs. | |
92423534 JB |
173 | You and Emacs play in turn by marking a free square. You mark it with X |
174 | and Emacs marks it with O. The winner is the first to get five contiguous | |
a2535589 | 175 | marks horizontally, vertically or in diagonal. |
a2535589 | 176 | |
92423534 | 177 | You play by moving the cursor over the square you choose and hitting \\[gomoku-human-plays]. |
a2535589 | 178 | |
92423534 | 179 | Other useful commands: |
a2535589 | 180 | \\{gomoku-mode-map} |
92423534 | 181 | Entry to this mode calls the value of `gomoku-mode-hook' if that value |
f5ecf0c9 | 182 | is non-nil. One interesting value is `turn-on-font-lock'." |
a2535589 JA |
183 | (interactive) |
184 | (setq major-mode 'gomoku-mode | |
185 | mode-name "Gomoku") | |
186 | (gomoku-display-statistics) | |
187 | (use-local-map gomoku-mode-map) | |
f5ecf0c9 RS |
188 | (make-local-variable 'font-lock-defaults) |
189 | (setq font-lock-defaults '(gomoku-font-lock-keywords t)) | |
190 | (toggle-read-only t) | |
a2535589 JA |
191 | (run-hooks 'gomoku-mode-hook)) |
192 | \f | |
193 | ;;; | |
194 | ;;; THE BOARD. | |
195 | ;;; | |
196 | ||
197 | ;; The board is a rectangular grid. We code empty squares with 0, X's with 1 | |
198 | ;; and O's with 6. The rectangle is recorded in a one dimensional vector | |
199 | ;; containing padding squares (coded with -1). These squares allow us to | |
200 | ;; detect when we are trying to move out of the board. We denote a square by | |
201 | ;; its (X,Y) coords, or by the INDEX corresponding to them in the vector. The | |
202 | ;; leftmost topmost square has coords (1,1) and index gomoku-board-width + 2. | |
203 | ;; Similarly, vectors between squares may be given by two DX, DY coords or by | |
204 | ;; one DEPL (the difference between indexes). | |
205 | ||
206 | (defvar gomoku-board-width nil | |
207 | "Number of columns on the Gomoku board.") | |
208 | ||
209 | (defvar gomoku-board-height nil | |
210 | "Number of lines on the Gomoku board.") | |
211 | ||
212 | (defvar gomoku-board nil | |
213 | "Vector recording the actual state of the Gomoku board.") | |
214 | ||
215 | (defvar gomoku-vector-length nil | |
216 | "Length of gomoku-board vector.") | |
217 | ||
218 | (defvar gomoku-draw-limit nil | |
219 | ;; This is usually set to 70% of the number of squares. | |
92423534 | 220 | "After how many moves will Emacs offer a draw?") |
a2535589 JA |
221 | |
222 | ||
223 | (defun gomoku-xy-to-index (x y) | |
224 | "Translate X, Y cartesian coords into the corresponding board index." | |
225 | (+ (* y gomoku-board-width) x y)) | |
226 | ||
227 | (defun gomoku-index-to-x (index) | |
228 | "Return corresponding x-coord of board INDEX." | |
229 | (% index (1+ gomoku-board-width))) | |
230 | ||
231 | (defun gomoku-index-to-y (index) | |
232 | "Return corresponding y-coord of board INDEX." | |
233 | (/ index (1+ gomoku-board-width))) | |
234 | ||
235 | (defun gomoku-init-board () | |
236 | "Create the gomoku-board vector and fill it with initial values." | |
237 | (setq gomoku-board (make-vector gomoku-vector-length 0)) | |
238 | ;; Every square is 0 (i.e. empty) except padding squares: | |
239 | (let ((i 0) (ii (1- gomoku-vector-length))) | |
240 | (while (<= i gomoku-board-width) ; The squares in [0..width] and in | |
241 | (aset gomoku-board i -1) ; [length - width - 1..length - 1] | |
242 | (aset gomoku-board ii -1) ; are padding squares. | |
243 | (setq i (1+ i) | |
244 | ii (1- ii)))) | |
245 | (let ((i 0)) | |
246 | (while (< i gomoku-vector-length) | |
247 | (aset gomoku-board i -1) ; and also all k*(width+1) | |
248 | (setq i (+ i gomoku-board-width 1))))) | |
249 | \f | |
250 | ;;; | |
251 | ;;; THE SCORE TABLE. | |
252 | ;;; | |
253 | ||
254 | ;; Every (free) square has a score associated to it, recorded in the | |
255 | ;; GOMOKU-SCORE-TABLE vector. The program always plays in the square having | |
256 | ;; the highest score. | |
257 | ||
258 | (defvar gomoku-score-table nil | |
259 | "Vector recording the actual score of the free squares.") | |
260 | ||
261 | ||
262 | ;; The key point point about the algorithm is that, rather than considering | |
263 | ;; the board as just a set of squares, we prefer to see it as a "space" of | |
264 | ;; internested 5-tuples of contiguous squares (called qtuples). | |
265 | ;; | |
266 | ;; The aim of the program is to fill one qtuple with its O's while preventing | |
267 | ;; you from filling another one with your X's. To that effect, it computes a | |
268 | ;; score for every qtuple, with better qtuples having better scores. Of | |
269 | ;; course, the score of a qtuple (taken in isolation) is just determined by | |
270 | ;; its contents as a set, i.e. not considering the order of its elements. The | |
271 | ;; highest score is given to the "OOOO" qtuples because playing in such a | |
272 | ;; qtuple is winning the game. Just after this comes the "XXXX" qtuple because | |
273 | ;; not playing in it is just loosing the game, and so on. Note that a | |
274 | ;; "polluted" qtuple, i.e. one containing at least one X and at least one O, | |
275 | ;; has score zero because there is no more any point in playing in it, from | |
276 | ;; both an attacking and a defending point of view. | |
277 | ;; | |
278 | ;; Given the score of every qtuple, the score of a given free square on the | |
279 | ;; board is just the sum of the scores of all the qtuples to which it belongs, | |
280 | ;; because playing in that square is playing in all its containing qtuples at | |
281 | ;; once. And it is that function which takes into account the internesting of | |
282 | ;; the qtuples. | |
283 | ;; | |
284 | ;; This algorithm is rather simple but anyway it gives a not so dumb level of | |
285 | ;; play. It easily extends to "n-dimensional Gomoku", where a win should not | |
286 | ;; be obtained with as few as 5 contiguous marks: 6 or 7 (depending on n !) | |
287 | ;; should be preferred. | |
288 | ||
289 | ||
290 | ;; Here are the scores of the nine "non-polluted" configurations. Tuning | |
291 | ;; these values will change (hopefully improve) the strength of the program | |
292 | ;; and may change its style (rather aggressive here). | |
293 | ||
294 | (defconst nil-score 7 "Score of an empty qtuple.") | |
295 | (defconst Xscore 15 "Score of a qtuple containing one X.") | |
296 | (defconst XXscore 400 "Score of a qtuple containing two X's.") | |
297 | (defconst XXXscore 1800 "Score of a qtuple containing three X's.") | |
298 | (defconst XXXXscore 100000 "Score of a qtuple containing four X's.") | |
299 | (defconst Oscore 35 "Score of a qtuple containing one O.") | |
300 | (defconst OOscore 800 "Score of a qtuple containing two O's.") | |
301 | (defconst OOOscore 15000 "Score of a qtuple containing three O's.") | |
302 | (defconst OOOOscore 800000 "Score of a qtuple containing four O's.") | |
303 | ||
304 | ;; These values are not just random: if, given the following situation: | |
305 | ;; | |
306 | ;; . . . . . . . O . | |
307 | ;; . X X a . . . X . | |
308 | ;; . . . X . . . X . | |
309 | ;; . . . X . . . X . | |
310 | ;; . . . . . . . b . | |
311 | ;; | |
312 | ;; you want Emacs to play in "a" and not in "b", then the parameters must | |
313 | ;; satisfy the inequality: | |
314 | ;; | |
315 | ;; 6 * XXscore > XXXscore + XXscore | |
316 | ;; | |
317 | ;; because "a" mainly belongs to six "XX" qtuples (the others are less | |
318 | ;; important) while "b" belongs to one "XXX" and one "XX" qtuples. Other | |
319 | ;; conditions are required to obtain sensible moves, but the previous example | |
320 | ;; should illustrate the point. If you manage to improve on these values, | |
321 | ;; please send me a note. Thanks. | |
322 | ||
323 | ||
a7acbbe4 KH |
324 | ;; As we chose values 0, 1 and 6 to denote empty, X and O squares, the |
325 | ;; contents of a qtuple are uniquely determined by the sum of its elements and | |
a2535589 JA |
326 | ;; we just have to set up a translation table. |
327 | ||
328 | (defconst gomoku-score-trans-table | |
329 | (vector nil-score Xscore XXscore XXXscore XXXXscore 0 | |
330 | Oscore 0 0 0 0 0 | |
331 | OOscore 0 0 0 0 0 | |
332 | OOOscore 0 0 0 0 0 | |
333 | OOOOscore 0 0 0 0 0 | |
334 | 0) | |
335 | "Vector associating qtuple contents to their score.") | |
336 | ||
337 | ||
338 | ;; If you do not modify drastically the previous constants, the only way for a | |
339 | ;; square to have a score higher than OOOOscore is to belong to a "OOOO" | |
340 | ;; qtuple, thus to be a winning move. Similarly, the only way for a square to | |
341 | ;; have a score between XXXXscore and OOOOscore is to belong to a "XXXX" | |
342 | ;; qtuple. We may use these considerations to detect when a given move is | |
343 | ;; winning or loosing. | |
344 | ||
345 | (defconst gomoku-winning-threshold OOOOscore | |
92423534 | 346 | "Threshold score beyond which an Emacs move is winning.") |
a2535589 JA |
347 | |
348 | (defconst gomoku-loosing-threshold XXXXscore | |
349 | "Threshold score beyond which a human move is winning.") | |
350 | ||
351 | ||
352 | (defun gomoku-strongest-square () | |
353 | "Compute index of free square with highest score, or nil if none." | |
354 | ;; We just have to loop other all squares. However there are two problems: | |
355 | ;; 1/ The SCORE-TABLE only gives correct scores to free squares. To speed | |
356 | ;; up future searches, we set the score of padding or occupied squares | |
357 | ;; to -1 whenever we meet them. | |
358 | ;; 2/ We want to choose randomly between equally good moves. | |
359 | (let ((score-max 0) | |
360 | (count 0) ; Number of equally good moves | |
361 | (square (gomoku-xy-to-index 1 1)) ; First square | |
362 | (end (gomoku-xy-to-index gomoku-board-width gomoku-board-height)) | |
363 | best-square score) | |
364 | (while (<= square end) | |
365 | (cond | |
366 | ;; If score is lower (i.e. most of the time), skip to next: | |
367 | ((< (aref gomoku-score-table square) score-max)) | |
368 | ;; If score is better, beware of non free squares: | |
369 | ((> (setq score (aref gomoku-score-table square)) score-max) | |
370 | (if (zerop (aref gomoku-board square)) ; is it free ? | |
371 | (setq count 1 ; yes: take it ! | |
372 | best-square square | |
373 | score-max score) | |
374 | (aset gomoku-score-table square -1))) ; no: kill it ! | |
375 | ;; If score is equally good, choose randomly. But first check freeness: | |
376 | ((not (zerop (aref gomoku-board square))) | |
377 | (aset gomoku-score-table square -1)) | |
f7e55318 | 378 | ((zerop (random (setq count (1+ count)))) |
a2535589 JA |
379 | (setq best-square square |
380 | score-max score))) | |
381 | (setq square (1+ square))) ; try next square | |
382 | best-square)) | |
a2535589 JA |
383 | \f |
384 | ;;; | |
385 | ;;; INITIALIZING THE SCORE TABLE. | |
386 | ;;; | |
387 | ||
388 | ;; At initialization the board is empty so that every qtuple amounts for | |
389 | ;; nil-score. Therefore, the score of any square is nil-score times the number | |
390 | ;; of qtuples that pass through it. This number is 3 in a corner and 20 if you | |
391 | ;; are sufficiently far from the sides. As computing the number is time | |
392 | ;; consuming, we initialize every square with 20*nil-score and then only | |
393 | ;; consider squares at less than 5 squares from one side. We speed this up by | |
394 | ;; taking symmetry into account. | |
395 | ;; Also, as it is likely that successive games will be played on a board with | |
396 | ;; same size, it is a good idea to save the initial SCORE-TABLE configuration. | |
397 | ||
398 | (defvar gomoku-saved-score-table nil | |
399 | "Recorded initial value of previous score table.") | |
400 | ||
401 | (defvar gomoku-saved-board-width nil | |
402 | "Recorded value of previous board width.") | |
403 | ||
404 | (defvar gomoku-saved-board-height nil | |
405 | "Recorded value of previous board height.") | |
406 | ||
407 | ||
408 | (defun gomoku-init-score-table () | |
409 | "Create the score table vector and fill it with initial values." | |
410 | (if (and gomoku-saved-score-table ; Has it been stored last time ? | |
411 | (= gomoku-board-width gomoku-saved-board-width) | |
412 | (= gomoku-board-height gomoku-saved-board-height)) | |
413 | (setq gomoku-score-table (copy-sequence gomoku-saved-score-table)) | |
414 | ;; No, compute it: | |
415 | (setq gomoku-score-table | |
416 | (make-vector gomoku-vector-length (* 20 nil-score))) | |
417 | (let (i j maxi maxj maxi2 maxj2) | |
418 | (setq maxi (/ (1+ gomoku-board-width) 2) | |
419 | maxj (/ (1+ gomoku-board-height) 2) | |
420 | maxi2 (min 4 maxi) | |
421 | maxj2 (min 4 maxj)) | |
422 | ;; We took symmetry into account and could use it more if the board | |
423 | ;; would have been square and not rectangular ! | |
424 | ;; In our case we deal with all (i,j) in the set [1..maxi2]*[1..maxj] U | |
425 | ;; [maxi2+1..maxi]*[1..maxj2]. Maxi2 and maxj2 are used because the | |
426 | ;; board may well be less than 8 by 8 ! | |
427 | (setq i 1) | |
428 | (while (<= i maxi2) | |
429 | (setq j 1) | |
430 | (while (<= j maxj) | |
431 | (gomoku-init-square-score i j) | |
432 | (setq j (1+ j))) | |
433 | (setq i (1+ i))) | |
434 | (while (<= i maxi) | |
435 | (setq j 1) | |
436 | (while (<= j maxj2) | |
437 | (gomoku-init-square-score i j) | |
438 | (setq j (1+ j))) | |
439 | (setq i (1+ i)))) | |
440 | (setq gomoku-saved-score-table (copy-sequence gomoku-score-table) | |
441 | gomoku-saved-board-width gomoku-board-width | |
442 | gomoku-saved-board-height gomoku-board-height))) | |
443 | ||
444 | (defun gomoku-nb-qtuples (i j) | |
445 | "Return the number of qtuples containing square I,J." | |
92423534 | 446 | ;; This function is complicated because we have to deal |
a2535589 JA |
447 | ;; with ugly cases like 3 by 6 boards, but it works. |
448 | ;; If you have a simpler (and correct) solution, send it to me. Thanks ! | |
449 | (let ((left (min 4 (1- i))) | |
450 | (right (min 4 (- gomoku-board-width i))) | |
451 | (up (min 4 (1- j))) | |
452 | (down (min 4 (- gomoku-board-height j)))) | |
453 | (+ -12 | |
454 | (min (max (+ left right) 3) 8) | |
455 | (min (max (+ up down) 3) 8) | |
456 | (min (max (+ (min left up) (min right down)) 3) 8) | |
457 | (min (max (+ (min right up) (min left down)) 3) 8)))) | |
458 | ||
459 | (defun gomoku-init-square-score (i j) | |
460 | "Give initial score to square I,J and to its mirror images." | |
461 | (let ((ii (1+ (- gomoku-board-width i))) | |
462 | (jj (1+ (- gomoku-board-height j))) | |
463 | (sc (* (gomoku-nb-qtuples i j) (aref gomoku-score-trans-table 0)))) | |
464 | (aset gomoku-score-table (gomoku-xy-to-index i j) sc) | |
465 | (aset gomoku-score-table (gomoku-xy-to-index ii j) sc) | |
466 | (aset gomoku-score-table (gomoku-xy-to-index i jj) sc) | |
467 | (aset gomoku-score-table (gomoku-xy-to-index ii jj) sc))) | |
468 | \f | |
469 | ;;; | |
470 | ;;; MAINTAINING THE SCORE TABLE. | |
471 | ;;; | |
472 | ||
473 | ;; We do not provide functions for computing the SCORE-TABLE given the | |
474 | ;; contents of the BOARD. This would involve heavy nested loops, with time | |
475 | ;; proportional to the size of the board. It is better to update the | |
476 | ;; SCORE-TABLE after each move. Updating needs not modify more than 36 | |
477 | ;; squares: it is done in constant time. | |
478 | ||
479 | (defun gomoku-update-score-table (square dval) | |
480 | "Update score table after SQUARE received a DVAL increment." | |
481 | ;; The board has already been updated when this function is called. | |
482 | ;; Updating scores is done by looking for qtuples boundaries in all four | |
483 | ;; directions and then calling update-score-in-direction. | |
484 | ;; Finally all squares received the right increment, and then are up to | |
485 | ;; date, except possibly for SQUARE itself if we are taking a move back for | |
486 | ;; its score had been set to -1 at the time. | |
487 | (let* ((x (gomoku-index-to-x square)) | |
488 | (y (gomoku-index-to-y square)) | |
489 | (imin (max -4 (- 1 x))) | |
490 | (jmin (max -4 (- 1 y))) | |
491 | (imax (min 0 (- gomoku-board-width x 4))) | |
492 | (jmax (min 0 (- gomoku-board-height y 4)))) | |
493 | (gomoku-update-score-in-direction imin imax | |
494 | square 1 0 dval) | |
495 | (gomoku-update-score-in-direction jmin jmax | |
496 | square 0 1 dval) | |
497 | (gomoku-update-score-in-direction (max imin jmin) (min imax jmax) | |
498 | square 1 1 dval) | |
499 | (gomoku-update-score-in-direction (max (- 1 y) -4 | |
500 | (- x gomoku-board-width)) | |
501 | (min 0 (- x 5) | |
502 | (- gomoku-board-height y 4)) | |
503 | square -1 1 dval))) | |
504 | ||
505 | (defun gomoku-update-score-in-direction (left right square dx dy dval) | |
506 | "Update scores for all squares in the qtuples starting between the LEFTth | |
507 | square and the RIGHTth after SQUARE, along the DX, DY direction, considering | |
508 | that DVAL has been added on SQUARE." | |
509 | ;; We always have LEFT <= 0, RIGHT <= 0 and DEPL > 0 but we may very well | |
510 | ;; have LEFT > RIGHT, indicating that no qtuple contains SQUARE along that | |
511 | ;; DX,DY direction. | |
512 | (cond | |
513 | ((> left right)) ; Quit | |
514 | (t ; Else .. | |
515 | (let (depl square0 square1 square2 count delta) | |
516 | (setq depl (gomoku-xy-to-index dx dy) | |
517 | square0 (+ square (* left depl)) | |
518 | square1 (+ square (* right depl)) | |
519 | square2 (+ square0 (* 4 depl))) | |
520 | ;; Compute the contents of the first qtuple: | |
521 | (setq square square0 | |
522 | count 0) | |
523 | (while (<= square square2) | |
524 | (setq count (+ count (aref gomoku-board square)) | |
525 | square (+ square depl))) | |
526 | (while (<= square0 square1) | |
527 | ;; Update the squares of the qtuple beginning in SQUARE0 and ending | |
528 | ;; in SQUARE2. | |
529 | (setq delta (- (aref gomoku-score-trans-table count) | |
530 | (aref gomoku-score-trans-table (- count dval)))) | |
531 | (cond ((not (zerop delta)) ; or else nothing to update | |
532 | (setq square square0) | |
533 | (while (<= square square2) | |
534 | (if (zerop (aref gomoku-board square)) ; only for free squares | |
535 | (aset gomoku-score-table square | |
536 | (+ (aref gomoku-score-table square) delta))) | |
537 | (setq square (+ square depl))))) | |
538 | ;; Then shift the qtuple one square along DEPL, this only requires | |
539 | ;; modifying SQUARE0 and SQUARE2. | |
540 | (setq square2 (+ square2 depl) | |
541 | count (+ count (- (aref gomoku-board square0)) | |
542 | (aref gomoku-board square2)) | |
543 | square0 (+ square0 depl))))))) | |
544 | \f | |
545 | ;;; | |
546 | ;;; GAME CONTROL. | |
547 | ;;; | |
548 | ||
549 | ;; Several variables are used to monitor a game, including a GAME-HISTORY (the | |
550 | ;; list of all (SQUARE . PREVSCORE) played) that allows to take moves back | |
551 | ;; (anti-updating the score table) and to compute the table from scratch in | |
552 | ;; case of an interruption. | |
553 | ||
554 | (defvar gomoku-game-in-progress nil | |
555 | "Non-nil if a game is in progress.") | |
556 | ||
557 | (defvar gomoku-game-history nil | |
558 | "A record of all moves that have been played during current game.") | |
559 | ||
560 | (defvar gomoku-number-of-moves nil | |
561 | "Number of moves already played in current game.") | |
562 | ||
563 | (defvar gomoku-number-of-human-moves nil | |
564 | "Number of moves already played by human in current game.") | |
565 | ||
566 | (defvar gomoku-emacs-played-first nil | |
567 | "Non-nil if Emacs played first.") | |
568 | ||
569 | (defvar gomoku-human-took-back nil | |
570 | "Non-nil if Human took back a move during the game.") | |
571 | ||
572 | (defvar gomoku-human-refused-draw nil | |
573 | "Non-nil if Human refused Emacs offer of a draw.") | |
574 | ||
575 | (defvar gomoku-emacs-is-computing nil | |
576 | ;; This is used to detect interruptions. Hopefully, it should not be needed. | |
577 | "Non-nil if Emacs is in the middle of a computation.") | |
578 | ||
579 | ||
580 | (defun gomoku-start-game (n m) | |
581 | "Initialize a new game on an N by M board." | |
582 | (setq gomoku-emacs-is-computing t) ; Raise flag | |
583 | (setq gomoku-game-in-progress t) | |
584 | (setq gomoku-board-width n | |
585 | gomoku-board-height m | |
586 | gomoku-vector-length (1+ (* (+ m 2) (1+ n))) | |
587 | gomoku-draw-limit (/ (* 7 n m) 10)) | |
f5ecf0c9 RS |
588 | (setq gomoku-emacs-won nil |
589 | gomoku-game-history nil | |
a2535589 JA |
590 | gomoku-number-of-moves 0 |
591 | gomoku-number-of-human-moves 0 | |
592 | gomoku-emacs-played-first nil | |
593 | gomoku-human-took-back nil | |
594 | gomoku-human-refused-draw nil) | |
595 | (gomoku-init-display n m) ; Display first: the rest takes time | |
596 | (gomoku-init-score-table) ; INIT-BOARD requires that the score | |
597 | (gomoku-init-board) ; table be already created. | |
598 | (setq gomoku-emacs-is-computing nil)) | |
599 | ||
600 | (defun gomoku-play-move (square val &optional dont-update-score) | |
601 | "Go to SQUARE, play VAL and update everything." | |
602 | (setq gomoku-emacs-is-computing t) ; Raise flag | |
603 | (cond ((= 1 val) ; a Human move | |
604 | (setq gomoku-number-of-human-moves (1+ gomoku-number-of-human-moves))) | |
605 | ((zerop gomoku-number-of-moves) ; an Emacs move. Is it first ? | |
606 | (setq gomoku-emacs-played-first t))) | |
607 | (setq gomoku-game-history | |
608 | (cons (cons square (aref gomoku-score-table square)) | |
609 | gomoku-game-history) | |
610 | gomoku-number-of-moves (1+ gomoku-number-of-moves)) | |
611 | (gomoku-plot-square square val) | |
612 | (aset gomoku-board square val) ; *BEFORE* UPDATE-SCORE ! | |
613 | (if dont-update-score nil | |
614 | (gomoku-update-score-table square val) ; previous val was 0: dval = val | |
615 | (aset gomoku-score-table square -1)) | |
616 | (setq gomoku-emacs-is-computing nil)) | |
617 | ||
618 | (defun gomoku-take-back () | |
619 | "Take back last move and update everything." | |
620 | (setq gomoku-emacs-is-computing t) | |
621 | (let* ((last-move (car gomoku-game-history)) | |
622 | (square (car last-move)) | |
623 | (oldval (aref gomoku-board square))) | |
624 | (if (= 1 oldval) | |
625 | (setq gomoku-number-of-human-moves (1- gomoku-number-of-human-moves))) | |
626 | (setq gomoku-game-history (cdr gomoku-game-history) | |
627 | gomoku-number-of-moves (1- gomoku-number-of-moves)) | |
628 | (gomoku-plot-square square 0) | |
629 | (aset gomoku-board square 0) ; *BEFORE* UPDATE-SCORE ! | |
630 | (gomoku-update-score-table square (- oldval)) | |
631 | (aset gomoku-score-table square (cdr last-move))) | |
632 | (setq gomoku-emacs-is-computing nil)) | |
633 | \f | |
634 | ;;; | |
635 | ;;; SESSION CONTROL. | |
636 | ;;; | |
637 | ||
d9a62b4c RS |
638 | (defvar gomoku-number-of-emacs-wins 0 |
639 | "Number of games Emacs won in this session.") | |
a2535589 | 640 | |
d9a62b4c RS |
641 | (defvar gomoku-number-of-human-wins 0 |
642 | "Number of games you won in this session.") | |
a2535589 JA |
643 | |
644 | (defvar gomoku-number-of-draws 0 | |
645 | "Number of games already drawn in this session.") | |
646 | ||
647 | ||
648 | (defun gomoku-terminate-game (result) | |
649 | "Terminate the current game with RESULT." | |
d7ab2718 RS |
650 | (message |
651 | (cond | |
652 | ((eq result 'emacs-won) | |
653 | (setq gomoku-number-of-emacs-wins (1+ gomoku-number-of-emacs-wins)) | |
654 | (cond ((< gomoku-number-of-moves 20) | |
655 | "This was a REALLY QUICK win.") | |
656 | (gomoku-human-refused-draw | |
657 | "I won... Too bad you refused my offer of a draw !") | |
658 | (gomoku-human-took-back | |
659 | "I won... Taking moves back will not help you !") | |
660 | ((not gomoku-emacs-played-first) | |
661 | "I won... Playing first did not help you much !") | |
662 | ((and (zerop gomoku-number-of-human-wins) | |
663 | (zerop gomoku-number-of-draws) | |
664 | (> gomoku-number-of-emacs-wins 1)) | |
665 | "I'm becoming tired of winning...") | |
666 | ("I won."))) | |
667 | ((eq result 'human-won) | |
668 | (setq gomoku-number-of-human-wins (1+ gomoku-number-of-human-wins)) | |
669 | (concat "OK, you won this one." | |
670 | (cond | |
671 | (gomoku-human-took-back | |
672 | " I, for one, never take my moves back...") | |
673 | (gomoku-emacs-played-first | |
674 | ".. so what ?") | |
675 | (" Now, let me play first just once.")))) | |
676 | ((eq result 'human-resigned) | |
677 | (setq gomoku-number-of-emacs-wins (1+ gomoku-number-of-emacs-wins)) | |
678 | "So you resign. That's just one more win for me.") | |
679 | ((eq result 'nobody-won) | |
680 | (setq gomoku-number-of-draws (1+ gomoku-number-of-draws)) | |
681 | (concat "This is a draw. " | |
682 | (cond | |
683 | (gomoku-human-took-back | |
684 | "I, for one, never take my moves back...") | |
685 | (gomoku-emacs-played-first | |
686 | "Just chance, I guess.") | |
687 | ("Now, let me play first just once.")))) | |
688 | ((eq result 'draw-agreed) | |
689 | (setq gomoku-number-of-draws (1+ gomoku-number-of-draws)) | |
690 | (concat "Draw agreed. " | |
691 | (cond | |
692 | (gomoku-human-took-back | |
693 | "I, for one, never take my moves back...") | |
694 | (gomoku-emacs-played-first | |
695 | "You were lucky.") | |
696 | ("Now, let me play first just once.")))) | |
697 | ((eq result 'crash-game) | |
698 | "Sorry, I have been interrupted and cannot resume that game..."))) | |
699 | (gomoku-display-statistics) | |
700 | ;;(ding) | |
701 | (setq gomoku-game-in-progress nil)) | |
a2535589 JA |
702 | |
703 | (defun gomoku-crash-game () | |
704 | "What to do when Emacs detects it has been interrupted." | |
705 | (setq gomoku-emacs-is-computing nil) | |
706 | (gomoku-terminate-game 'crash-game) | |
707 | (sit-for 4) ; Let's see the message | |
708 | (gomoku-prompt-for-other-game)) | |
709 | \f | |
710 | ;;; | |
711 | ;;; INTERACTIVE COMMANDS. | |
712 | ;;; | |
713 | ||
d9a7a8f5 | 714 | ;;;###autoload |
a2535589 JA |
715 | (defun gomoku (&optional n m) |
716 | "Start a Gomoku game between you and Emacs. | |
717 | If a game is in progress, this command allow you to resume it. | |
718 | If optional arguments N and M are given, an N by M board is used. | |
d7ab2718 | 719 | If prefix arg is given for N, M is prompted for. |
a2535589 | 720 | |
92423534 | 721 | You and Emacs play in turn by marking a free square. You mark it with X |
a2535589 JA |
722 | and Emacs marks it with O. The winner is the first to get five contiguous |
723 | marks horizontally, vertically or in diagonal. | |
92423534 JB |
724 | |
725 | You play by moving the cursor over the square you choose and hitting | |
726 | \\<gomoku-mode-map>\\[gomoku-human-plays]. | |
727 | Use \\[describe-mode] for more info." | |
d7ab2718 RS |
728 | (interactive (if current-prefix-arg |
729 | (list (prefix-numeric-value current-prefix-arg) | |
730 | (eval (read-minibuffer "Height: "))))) | |
a2535589 JA |
731 | (gomoku-switch-to-window) |
732 | (cond | |
733 | (gomoku-emacs-is-computing | |
734 | (gomoku-crash-game)) | |
d7ab2718 RS |
735 | ((or (not gomoku-game-in-progress) |
736 | (<= gomoku-number-of-moves 2)) | |
a2535589 JA |
737 | (let ((max-width (gomoku-max-width)) |
738 | (max-height (gomoku-max-height))) | |
739 | (or n (setq n max-width)) | |
740 | (or m (setq m max-height)) | |
741 | (cond ((< n 1) | |
742 | (error "I need at least 1 column")) | |
743 | ((< m 1) | |
744 | (error "I need at least 1 row")) | |
745 | ((> n max-width) | |
746 | (error "I cannot display %d columns in that window" n))) | |
747 | (if (and (> m max-height) | |
d7ab2718 RS |
748 | (not (eq m gomoku-saved-board-height)) |
749 | ;; Use EQ because SAVED-BOARD-HEIGHT may be nil | |
a2535589 JA |
750 | (not (y-or-n-p (format "Do you really want %d rows " m)))) |
751 | (setq m max-height))) | |
752 | (message "One moment, please...") | |
753 | (gomoku-start-game n m) | |
754 | (if (y-or-n-p "Do you allow me to play first ") | |
755 | (gomoku-emacs-plays) | |
756 | (gomoku-prompt-for-move))) | |
757 | ((y-or-n-p "Shall we continue our game ") | |
758 | (gomoku-prompt-for-move)) | |
759 | (t | |
760 | (gomoku-human-resigns)))) | |
761 | ||
762 | (defun gomoku-emacs-plays () | |
763 | "Compute Emacs next move and play it." | |
764 | (interactive) | |
765 | (gomoku-switch-to-window) | |
766 | (cond | |
767 | (gomoku-emacs-is-computing | |
768 | (gomoku-crash-game)) | |
769 | ((not gomoku-game-in-progress) | |
770 | (gomoku-prompt-for-other-game)) | |
771 | (t | |
772 | (message "Let me think...") | |
773 | (let (square score) | |
774 | (setq square (gomoku-strongest-square)) | |
775 | (cond ((null square) | |
776 | (gomoku-terminate-game 'nobody-won)) | |
777 | (t | |
778 | (setq score (aref gomoku-score-table square)) | |
779 | (gomoku-play-move square 6) | |
780 | (cond ((>= score gomoku-winning-threshold) | |
f5ecf0c9 | 781 | (setq gomoku-emacs-won t) ; for font-lock |
d7ab2718 | 782 | (gomoku-find-filled-qtuple square 6) |
a2535589 JA |
783 | (gomoku-terminate-game 'emacs-won)) |
784 | ((zerop score) | |
785 | (gomoku-terminate-game 'nobody-won)) | |
786 | ((and (> gomoku-number-of-moves gomoku-draw-limit) | |
787 | (not gomoku-human-refused-draw) | |
788 | (gomoku-offer-a-draw)) | |
789 | (gomoku-terminate-game 'draw-agreed)) | |
790 | (t | |
791 | (gomoku-prompt-for-move))))))))) | |
792 | ||
d7ab2718 RS |
793 | ;; For small square dimensions this is approximate, since though measured in |
794 | ;; pixels, event's (X . Y) is a character's top-left corner. | |
65091471 | 795 | (defun gomoku-click (click) |
d7ab2718 RS |
796 | "Position at the square where you click." |
797 | (interactive "e") | |
798 | (and (windowp (posn-window (setq click (event-end click)))) | |
799 | (numberp (posn-point click)) | |
800 | (select-window (posn-window click)) | |
801 | (setq click (posn-col-row click)) | |
802 | (gomoku-goto-xy | |
803 | (min (max (/ (+ (- (car click) | |
804 | gomoku-x-offset | |
805 | 1) | |
806 | (window-hscroll) | |
807 | gomoku-square-width | |
808 | (% gomoku-square-width 2) | |
809 | (/ gomoku-square-width 2)) | |
810 | gomoku-square-width) | |
811 | 1) | |
812 | gomoku-board-width) | |
813 | (min (max (/ (+ (- (cdr click) | |
814 | gomoku-y-offset | |
815 | 1) | |
816 | (let ((inhibit-point-motion-hooks t)) | |
817 | (count-lines 1 (window-start))) | |
818 | gomoku-square-height | |
819 | (% gomoku-square-height 2) | |
820 | (/ gomoku-square-height 2)) | |
821 | gomoku-square-height) | |
822 | 1) | |
823 | gomoku-board-height)))) | |
824 | ||
825 | (defun gomoku-mouse-play (click) | |
65091471 RS |
826 | "Play at the square where you click." |
827 | (interactive "e") | |
d7ab2718 RS |
828 | (if (gomoku-click click) |
829 | (gomoku-human-plays))) | |
65091471 | 830 | |
a2535589 JA |
831 | (defun gomoku-human-plays () |
832 | "Signal to the Gomoku program that you have played. | |
833 | You must have put the cursor on the square where you want to play. | |
834 | If the game is finished, this command requests for another game." | |
835 | (interactive) | |
836 | (gomoku-switch-to-window) | |
837 | (cond | |
838 | (gomoku-emacs-is-computing | |
839 | (gomoku-crash-game)) | |
840 | ((not gomoku-game-in-progress) | |
841 | (gomoku-prompt-for-other-game)) | |
842 | (t | |
843 | (let (square score) | |
844 | (setq square (gomoku-point-square)) | |
845 | (cond ((null square) | |
846 | (error "Your point is not on a square. Retry !")) | |
847 | ((not (zerop (aref gomoku-board square))) | |
848 | (error "Your point is not on a free square. Retry !")) | |
849 | (t | |
850 | (setq score (aref gomoku-score-table square)) | |
851 | (gomoku-play-move square 1) | |
852 | (cond ((and (>= score gomoku-loosing-threshold) | |
853 | ;; Just testing SCORE > THRESHOLD is not enough for | |
854 | ;; detecting wins, it just gives an indication that | |
855 | ;; we confirm with GOMOKU-FIND-FILLED-QTUPLE. | |
856 | (gomoku-find-filled-qtuple square 1)) | |
a2535589 JA |
857 | (gomoku-terminate-game 'human-won)) |
858 | (t | |
859 | (gomoku-emacs-plays))))))))) | |
860 | ||
861 | (defun gomoku-human-takes-back () | |
862 | "Signal to the Gomoku program that you wish to take back your last move." | |
863 | (interactive) | |
864 | (gomoku-switch-to-window) | |
865 | (cond | |
866 | (gomoku-emacs-is-computing | |
867 | (gomoku-crash-game)) | |
868 | ((not gomoku-game-in-progress) | |
869 | (message "Too late for taking back...") | |
870 | (sit-for 4) | |
871 | (gomoku-prompt-for-other-game)) | |
872 | ((zerop gomoku-number-of-human-moves) | |
873 | (message "You have not played yet... Your move ?")) | |
874 | (t | |
875 | (message "One moment, please...") | |
876 | ;; It is possible for the user to let Emacs play several consecutive | |
877 | ;; moves, so that the best way to know when to stop taking back moves is | |
878 | ;; to count the number of human moves: | |
879 | (setq gomoku-human-took-back t) | |
880 | (let ((number gomoku-number-of-human-moves)) | |
881 | (while (= number gomoku-number-of-human-moves) | |
882 | (gomoku-take-back))) | |
883 | (gomoku-prompt-for-move)))) | |
884 | ||
885 | (defun gomoku-human-resigns () | |
886 | "Signal to the Gomoku program that you may want to resign." | |
887 | (interactive) | |
888 | (gomoku-switch-to-window) | |
889 | (cond | |
890 | (gomoku-emacs-is-computing | |
891 | (gomoku-crash-game)) | |
892 | ((not gomoku-game-in-progress) | |
893 | (message "There is no game in progress")) | |
894 | ((y-or-n-p "You mean, you resign ") | |
895 | (gomoku-terminate-game 'human-resigned)) | |
896 | ((y-or-n-p "You mean, we continue ") | |
897 | (gomoku-prompt-for-move)) | |
898 | (t | |
899 | (gomoku-terminate-game 'human-resigned)))) ; OK. Accept it | |
900 | \f | |
901 | ;;; | |
902 | ;;; PROMPTING THE HUMAN PLAYER. | |
903 | ;;; | |
904 | ||
905 | (defun gomoku-prompt-for-move () | |
906 | "Display a message asking for Human's move." | |
907 | (message (if (zerop gomoku-number-of-human-moves) | |
908 | "Your move ? (move to a free square and hit X, RET ...)" | |
909 | "Your move ?")) | |
910 | ;; This may seem silly, but if one omits the following line (or a similar | |
911 | ;; one), the cursor may very well go to some place where POINT is not. | |
912 | (save-excursion (set-buffer (other-buffer)))) | |
913 | ||
914 | (defun gomoku-prompt-for-other-game () | |
915 | "Ask for another game, and start it." | |
916 | (if (y-or-n-p "Another game ") | |
917 | (gomoku gomoku-board-width gomoku-board-height) | |
d7ab2718 | 918 | (message "Chicken !"))) |
a2535589 JA |
919 | |
920 | (defun gomoku-offer-a-draw () | |
921 | "Offer a draw and return T if Human accepted it." | |
922 | (or (y-or-n-p "I offer you a draw. Do you accept it ") | |
d7ab2718 | 923 | (not (setq gomoku-human-refused-draw t)))) |
a2535589 JA |
924 | \f |
925 | ;;; | |
926 | ;;; DISPLAYING THE BOARD. | |
927 | ;;; | |
928 | ||
929 | ;; You may change these values if you have a small screen or if the squares | |
930 | ;; look rectangular, but spacings SHOULD be at least 2 (MUST BE at least 1). | |
931 | ||
932 | (defconst gomoku-square-width 4 | |
933 | "*Horizontal spacing between squares on the Gomoku board.") | |
934 | ||
935 | (defconst gomoku-square-height 2 | |
936 | "*Vertical spacing between squares on the Gomoku board.") | |
937 | ||
938 | (defconst gomoku-x-offset 3 | |
939 | "*Number of columns between the Gomoku board and the side of the window.") | |
940 | ||
941 | (defconst gomoku-y-offset 1 | |
942 | "*Number of lines between the Gomoku board and the top of the window.") | |
943 | ||
944 | ||
945 | (defun gomoku-max-width () | |
946 | "Largest possible board width for the current window." | |
947 | (1+ (/ (- (window-width (selected-window)) | |
948 | gomoku-x-offset gomoku-x-offset 1) | |
949 | gomoku-square-width))) | |
950 | ||
951 | (defun gomoku-max-height () | |
952 | "Largest possible board height for the current window." | |
953 | (1+ (/ (- (window-height (selected-window)) | |
954 | gomoku-y-offset gomoku-y-offset 2) | |
955 | ;; 2 instead of 1 because WINDOW-HEIGHT includes the mode line ! | |
956 | gomoku-square-height))) | |
957 | ||
a2535589 | 958 | (defun gomoku-point-y () |
d7ab2718 RS |
959 | "Return the board row where point is." |
960 | (let ((inhibit-point-motion-hooks t)) | |
961 | (1+ (/ (- (count-lines 1 (point)) gomoku-y-offset (if (bolp) 0 1)) | |
962 | gomoku-square-height)))) | |
a2535589 JA |
963 | |
964 | (defun gomoku-point-square () | |
d7ab2718 RS |
965 | "Return the index of the square point is on." |
966 | (let ((inhibit-point-motion-hooks t)) | |
967 | (gomoku-xy-to-index (1+ (/ (- (current-column) gomoku-x-offset) | |
968 | gomoku-square-width)) | |
969 | (gomoku-point-y)))) | |
a2535589 JA |
970 | |
971 | (defun gomoku-goto-square (index) | |
972 | "Move point to square number INDEX." | |
973 | (gomoku-goto-xy (gomoku-index-to-x index) (gomoku-index-to-y index))) | |
974 | ||
975 | (defun gomoku-goto-xy (x y) | |
976 | "Move point to square at X, Y coords." | |
d7ab2718 RS |
977 | (let ((inhibit-point-motion-hooks t)) |
978 | (goto-line (+ 1 gomoku-y-offset (* gomoku-square-height (1- y))))) | |
a2535589 JA |
979 | (move-to-column (+ gomoku-x-offset (* gomoku-square-width (1- x))))) |
980 | ||
981 | (defun gomoku-plot-square (square value) | |
d7ab2718 RS |
982 | "Draw 'X', 'O' or '.' on SQUARE depending on VALUE, leave point there." |
983 | (or (= value 1) | |
984 | (gomoku-goto-square square)) | |
f5ecf0c9 RS |
985 | (let ((inhibit-read-only t) |
986 | (inhibit-point-motion-hooks t)) | |
d7ab2718 RS |
987 | (insert-and-inherit (cond ((= value 1) ?X) |
988 | ((= value 6) ?O) | |
989 | (?.))) | |
f5ecf0c9 | 990 | (and window-system |
d7ab2718 | 991 | (zerop value) |
f5ecf0c9 | 992 | (put-text-property (1- (point)) (point) 'mouse-face 'highlight)) |
0720cc69 | 993 | (delete-char 1) |
d7ab2718 RS |
994 | (backward-char 1)) |
995 | (sit-for 0)) ; Display NOW | |
a2535589 JA |
996 | |
997 | (defun gomoku-init-display (n m) | |
998 | "Display an N by M Gomoku board." | |
4a07a2af | 999 | (buffer-disable-undo (current-buffer)) |
f5ecf0c9 | 1000 | (let ((inhibit-read-only t) |
d7ab2718 RS |
1001 | (point 1) opoint |
1002 | (intangible t) | |
1003 | (i m) j x) | |
1004 | ;; Try to minimize number of chars (because of text properties) | |
1005 | (setq tab-width | |
1006 | (if (zerop (% gomoku-x-offset gomoku-square-width)) | |
1007 | gomoku-square-width | |
1008 | (max (/ (+ (% gomoku-x-offset gomoku-square-width) | |
1009 | gomoku-square-width 1) 2) 2))) | |
0720cc69 | 1010 | (erase-buffer) |
f5ecf0c9 RS |
1011 | (newline gomoku-y-offset) |
1012 | (while (progn | |
d7ab2718 RS |
1013 | (setq j n |
1014 | x (- gomoku-x-offset gomoku-square-width)) | |
1015 | (while (>= (setq j (1- j)) 0) | |
1016 | (insert-char ?\t (/ (- (setq x (+ x gomoku-square-width)) | |
1017 | (current-column)) | |
1018 | tab-width)) | |
1019 | (insert-char ? (- x (current-column))) | |
1020 | (if (setq intangible (not intangible)) | |
1021 | (put-text-property point (point) 'intangible 2)) | |
1022 | (and (zerop j) | |
1023 | (= i (- m 2)) | |
1024 | (progn | |
1025 | (while (>= i 3) | |
1026 | (append-to-buffer (current-buffer) opoint (point)) | |
1027 | (setq i (- i 2))) | |
1028 | (goto-char (point-max)))) | |
1029 | (setq point (point)) | |
1030 | (insert ?.) | |
1031 | (if window-system | |
1032 | (put-text-property point (point) | |
1033 | 'mouse-face 'highlight))) | |
f5ecf0c9 | 1034 | (> (setq i (1- i)) 0)) |
d7ab2718 RS |
1035 | (if (= i (1- m)) |
1036 | (setq opoint point)) | |
f5ecf0c9 | 1037 | (insert-char ?\n gomoku-square-height)) |
d7ab2718 RS |
1038 | (or (eq (char-after 1) ?.) |
1039 | (put-text-property 1 2 'point-entered | |
1040 | (lambda (x x) (if (bobp) (forward-char))))) | |
1041 | (or intangible | |
1042 | (put-text-property point (point) 'intangible 2)) | |
1043 | (put-text-property point (point) 'point-entered | |
1044 | (lambda (x x) (if (eobp) (backward-char)))) | |
1045 | (put-text-property (point-min) (point) 'category 'gomoku-mode)) | |
1046 | (gomoku-goto-xy (/ (1+ n) 2) (/ (1+ m) 2)) ; center of the board | |
f5ecf0c9 | 1047 | (sit-for 0)) ; Display NOW |
a2535589 JA |
1048 | |
1049 | (defun gomoku-display-statistics () | |
1050 | "Obnoxiously display some statistics about previous games in mode line." | |
1051 | ;; We store this string in the mode-line-process local variable. | |
1052 | ;; This is certainly not the cleanest way out ... | |
1053 | (setq mode-line-process | |
d7ab2718 RS |
1054 | (format ": Won %d, lost %d%s" |
1055 | gomoku-number-of-human-wins | |
1056 | gomoku-number-of-emacs-wins | |
1057 | (if (zerop gomoku-number-of-draws) | |
1058 | "" | |
1059 | (format ", drew %d" gomoku-number-of-draws)))) | |
1faea684 | 1060 | (force-mode-line-update)) |
a2535589 JA |
1061 | |
1062 | (defun gomoku-switch-to-window () | |
1063 | "Find or create the Gomoku buffer, and display it." | |
1064 | (interactive) | |
1065 | (let ((buff (get-buffer "*Gomoku*"))) | |
1066 | (if buff ; Buffer exists: | |
d7ab2718 RS |
1067 | (switch-to-buffer buff) ; no problem. |
1068 | (if gomoku-game-in-progress | |
1069 | (gomoku-crash-game)) ; buffer has been killed or something | |
1070 | (switch-to-buffer "*Gomoku*") ; Anyway, start anew. | |
1071 | (gomoku-mode)))) | |
a2535589 JA |
1072 | \f |
1073 | ;;; | |
1074 | ;;; CROSSING WINNING QTUPLES. | |
1075 | ;;; | |
1076 | ||
1077 | ;; When someone succeeds in filling a qtuple, we draw a line over the five | |
1078 | ;; corresponding squares. One problem is that the program does not know which | |
1079 | ;; squares ! It only knows the square where the last move has been played and | |
1080 | ;; who won. The solution is to scan the board along all four directions. | |
1081 | ||
a2535589 JA |
1082 | (defun gomoku-find-filled-qtuple (square value) |
1083 | "Return T if SQUARE belongs to a qtuple filled with VALUEs." | |
1084 | (or (gomoku-check-filled-qtuple square value 1 0) | |
1085 | (gomoku-check-filled-qtuple square value 0 1) | |
1086 | (gomoku-check-filled-qtuple square value 1 1) | |
1087 | (gomoku-check-filled-qtuple square value -1 1))) | |
1088 | ||
1089 | (defun gomoku-check-filled-qtuple (square value dx dy) | |
1090 | "Return T if SQUARE belongs to a qtuple filled with VALUEs along DX, DY." | |
a2535589 JA |
1091 | (let ((a 0) (b 0) |
1092 | (left square) (right square) | |
d7ab2718 | 1093 | (depl (gomoku-xy-to-index dx dy))) |
a2535589 JA |
1094 | (while (and (> a -4) ; stretch tuple left |
1095 | (= value (aref gomoku-board (setq left (- left depl))))) | |
1096 | (setq a (1- a))) | |
d7ab2718 | 1097 | (while (and (< b (+ a 4)) ; stretch tuple right |
a2535589 JA |
1098 | (= value (aref gomoku-board (setq right (+ right depl))))) |
1099 | (setq b (1+ b))) | |
d7ab2718 RS |
1100 | (cond ((= b (+ a 4)) ; tuple length = 5 ? |
1101 | (gomoku-cross-qtuple (+ square (* a depl)) (+ square (* b depl)) | |
1102 | dx dy) | |
a2535589 JA |
1103 | t)))) |
1104 | ||
a2535589 JA |
1105 | (defun gomoku-cross-qtuple (square1 square2 dx dy) |
1106 | "Cross every square between SQUARE1 and SQUARE2 in the DX, DY direction." | |
1107 | (save-excursion ; Not moving point from last square | |
f5ecf0c9 RS |
1108 | (let ((depl (gomoku-xy-to-index dx dy)) |
1109 | (inhibit-read-only t) | |
1110 | (inhibit-point-motion-hooks t)) | |
a2535589 | 1111 | ;; WARNING: this function assumes DEPL > 0 and SQUARE2 > SQUARE1 |
f5ecf0c9 | 1112 | (while (/= square1 square2) |
a2535589 JA |
1113 | (gomoku-goto-square square1) |
1114 | (setq square1 (+ square1 depl)) | |
1115 | (cond | |
f5ecf0c9 RS |
1116 | ((= dy 0) ; Horizontal |
1117 | (forward-char 1) | |
1118 | (insert-char ?- (1- gomoku-square-width) t) | |
d7ab2718 RS |
1119 | (delete-region (point) (progn |
1120 | (skip-chars-forward " \t") | |
1121 | (point)))) | |
f5ecf0c9 RS |
1122 | ((= dx 0) ; Vertical |
1123 | (let ((n 1) | |
1124 | (column (current-column))) | |
a2535589 JA |
1125 | (while (< n gomoku-square-height) |
1126 | (setq n (1+ n)) | |
f5ecf0c9 RS |
1127 | (forward-line 1) |
1128 | (indent-to column) | |
1129 | (insert-and-inherit ?|)))) | |
1130 | ((= dx -1) ; 1st Diagonal | |
d7ab2718 | 1131 | (indent-to (prog1 (- (current-column) (/ gomoku-square-width 2)) |
f5ecf0c9 RS |
1132 | (forward-line (/ gomoku-square-height 2)))) |
1133 | (insert-and-inherit ?/)) | |
1134 | (t ; 2nd Diagonal | |
d7ab2718 | 1135 | (indent-to (prog1 (+ (current-column) (/ gomoku-square-width 2)) |
f5ecf0c9 RS |
1136 | (forward-line (/ gomoku-square-height 2)))) |
1137 | (insert-and-inherit ?\\)))))) | |
a2535589 JA |
1138 | (sit-for 0)) ; Display NOW |
1139 | \f | |
1140 | ;;; | |
1141 | ;;; CURSOR MOTION. | |
1142 | ;;; | |
f5ecf0c9 | 1143 | ;; previous-line and next-line don't work right with intangible newlines |
a2535589 JA |
1144 | (defun gomoku-move-down () |
1145 | "Move point down one row on the Gomoku board." | |
1146 | (interactive) | |
d7ab2718 RS |
1147 | (if (< (gomoku-point-y) gomoku-board-height) |
1148 | (next-line gomoku-square-height))) | |
a2535589 JA |
1149 | |
1150 | (defun gomoku-move-up () | |
1151 | "Move point up one row on the Gomoku board." | |
1152 | (interactive) | |
d7ab2718 RS |
1153 | (if (> (gomoku-point-y) 1) |
1154 | (previous-line gomoku-square-height))) | |
a2535589 JA |
1155 | |
1156 | (defun gomoku-move-ne () | |
1157 | "Move point North East on the Gomoku board." | |
1158 | (interactive) | |
1159 | (gomoku-move-up) | |
f5ecf0c9 | 1160 | (forward-char)) |
a2535589 JA |
1161 | |
1162 | (defun gomoku-move-se () | |
1163 | "Move point South East on the Gomoku board." | |
1164 | (interactive) | |
1165 | (gomoku-move-down) | |
f5ecf0c9 | 1166 | (forward-char)) |
a2535589 JA |
1167 | |
1168 | (defun gomoku-move-nw () | |
1169 | "Move point North West on the Gomoku board." | |
1170 | (interactive) | |
1171 | (gomoku-move-up) | |
f5ecf0c9 | 1172 | (backward-char)) |
a2535589 JA |
1173 | |
1174 | (defun gomoku-move-sw () | |
1175 | "Move point South West on the Gomoku board." | |
1176 | (interactive) | |
1177 | (gomoku-move-down) | |
f5ecf0c9 | 1178 | (backward-char)) |
a2535589 | 1179 | |
d7ab2718 RS |
1180 | (defun gomoku-beginning-of-line () |
1181 | "Move point to first square on the Gomoku board row." | |
1182 | (interactive) | |
1183 | (move-to-column gomoku-x-offset)) | |
1184 | ||
1185 | (defun gomoku-end-of-line () | |
1186 | "Move point to last square on the Gomoku board row." | |
1187 | (interactive) | |
1188 | (move-to-column (+ gomoku-x-offset | |
1189 | (* gomoku-square-width (1- gomoku-board-width))))) | |
1190 | ||
49116ac0 JB |
1191 | (provide 'gomoku) |
1192 | ||
1a06eabd | 1193 | ;;; gomoku.el ends here |