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[gnu-emacs-elpa] / packages / sokoban / sokoban.el
1 ;;; sokoban.el --- Implementation of Sokoban for Emacs.
2
3 ;; Copyright (C) 1998, 2013 Free Software Foundation, Inc.
4
5 ;; Author: Glynn Clements <glynn.clements@virgin.net>
6 ;; Version: 1.04
7 ;; Created: 1997-09-11
8 ;; Keywords: games
9
10 ;; This file is part of XEmacs.
11
12 ;; XEmacs is free software; you can redistribute it and/or modify it
13 ;; under the terms of the GNU General Public License as published by
14 ;; the Free Software Foundation; either version 3 of the License, or
15 ;; (at your option) any later version.
16
17 ;; XEmacs is distributed in the hope that it will be useful, but
18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 ;; General Public License for more details.
21
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with XEmacs; see the file COPYING. If not, write to the Free
24 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
25 ;; 02111-1307, USA.
26
27 ;;; Synched up with: Not synched.
28
29 ;;; Commentary:
30
31 ;; Modified: 1998-01-09, conditionalised use of locate-data-directory
32 ;; Modified: 1998-01-27, added mouse interface code
33 ;; (provided by Sean MacLennan <bn932@freenet.carleton.ca>
34 ;; Modified: 1998-02-06, fixed bug, where sokoban-done wasn't reset to
35 ;; zero in sokoban-restart-level
36 ;; Modified: 1998-02-27, patches from Hrvoje Niksic
37 ;; added bounds check to sokoban-goto-level
38 ;; added popup menu
39 ;; display level and score in modeline
40 ;; Modified: 1998-06-04, added `undo' feature
41 ;; added number of blocks done/total to score and modeline
42 ;; Modified: 2003-06-14, update email address, remove URL
43
44 ;; Tested with XEmacs 20.3/4/5 and Emacs 19.34
45
46 ;; The game is based upon XSokoban, by
47 ;; Michael Bischoff <mbi@mo.math.nat.tu-bs.de>
48
49 ;; The levels and some of the pixmaps were
50 ;; taken directly from XSokoban
51
52 ;;; Code:
53
54 (eval-when-compile
55 (require 'cl))
56
57 (require 'gamegrid)
58
59 ;; ;;;;;;;;;;;;; customization variables ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
60
61 (defvar sokoban-use-glyphs t
62 "Non-nil means use glyphs when available.")
63
64 (defvar sokoban-use-color t
65 "Non-nil means use color when available.")
66
67 (defvar sokoban-font "-*-courier-medium-r-*-*-*-200-100-75-*-*-iso8859-*"
68 "Name of the font used in X mode.")
69
70 (defvar sokoban-buffer-name "*Sokoban*")
71
72 (defvar sokoban-temp-buffer-name " Sokoban-tmp")
73
74 (defvar sokoban-level-file
75 (if (fboundp 'locate-data-file)
76 (locate-data-file "sokoban.levels")
77 (or (locate-library "sokoban.levels")
78 (let ((file (expand-file-name
79 "sokoban.levels"
80 (if load-file-name
81 (file-name-directory load-file-name)))))
82 (and (file-exists-p file) file))
83 (expand-file-name "sokoban.levels" data-directory))))
84
85 (defvar sokoban-width 20)
86 (defvar sokoban-height 16)
87
88 (defvar sokoban-buffer-width 20)
89 (defvar sokoban-buffer-height 20)
90
91 (defvar sokoban-score-x 0)
92 (defvar sokoban-score-y 17)
93
94 (defvar sokoban-level-data nil)
95
96 ;; ;;;;;;;;;;;;; constants ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
97
98 (defconst sokoban-floor-xpm "\
99 /* XPM */
100 static char * floor_xpm[] = {
101 \"32 32 1 1\",
102 \" c None\",
103 \" \",
104 \" \",
105 \" \",
106 \" \",
107 \" \",
108 \" \",
109 \" \",
110 \" \",
111 \" \",
112 \" \",
113 \" \",
114 \" \",
115 \" \",
116 \" \",
117 \" \",
118 \" \",
119 \" \",
120 \" \",
121 \" \",
122 \" \",
123 \" \",
124 \" \",
125 \" \",
126 \" \",
127 \" \",
128 \" \",
129 \" \",
130 \" \",
131 \" \",
132 \" \",
133 \" \",
134 \" \",
135 };
136 ")
137
138 (defconst sokoban-target-xpm "\
139 /* XPM */
140 static char * target_xpm[] = {
141 \"32 32 3 1\",
142 \" c None\",
143 \". c black\",
144 \"X c yellow\",
145 \" \",
146 \" \",
147 \" \",
148 \" \",
149 \" \",
150 \" \",
151 \" ............ \",
152 \" .XXXXXXXXXX. \",
153 \" .XXXXXXXX. \",
154 \" .XXXXXX. \",
155 \" .. .XXXX. .. \",
156 \" .X. .XX. .X. \",
157 \" .XX. .. .XX. \",
158 \" .XXX. .XXX. \",
159 \" .XXXX. .XXXX. \",
160 \" .XXXXX. .XXXXX. \",
161 \" .XXXXX. .XXXXX. \",
162 \" .XXXX. .XXXX. \",
163 \" .XXX. .XXX. \",
164 \" .XX. .. .XX. \",
165 \" .X. .XX. .X. \",
166 \" .. .XXXX. .. \",
167 \" .XXXXXX. \",
168 \" .XXXXXXXX. \",
169 \" .XXXXXXXXXX. \",
170 \" ............ \",
171 \" \",
172 \" \",
173 \" \",
174 \" \",
175 \" \",
176 \" \",
177 };
178 ")
179
180 (defconst sokoban-wall-xpm "\
181 /* XPM */
182 static char * wall_xpm[] = {
183 \"32 32 2 1\",
184 \" c white\",
185 \". c SteelBlue\",
186 \" .............................. \",
187 \". ............................ .\",
188 \".. .......................... . \",
189 \"... ........................ . .\",
190 \".... . . \",
191 \".... ...................... . .\",
192 \".... ...................... . . \",
193 \".... ...................... . .\",
194 \".... ...................... . . \",
195 \".... ...................... . .\",
196 \".... ...................... . . \",
197 \".... ...................... . .\",
198 \".... ...................... . . \",
199 \".... ...................... . .\",
200 \".... ...................... . . \",
201 \".... ...................... . .\",
202 \".... ...................... . . \",
203 \".... ...................... . .\",
204 \".... ...................... . . \",
205 \".... ...................... . .\",
206 \".... ...................... . . \",
207 \".... ...................... . .\",
208 \".... ...................... . . \",
209 \".... ...................... . .\",
210 \".... ...................... . . \",
211 \".... ...................... . .\",
212 \".... ...................... . . \",
213 \".... . .\",
214 \"... . . . . . . . . . . . . . \",
215 \".. . . . . . . . . . . . . . .\",
216 \". . . . . . . . . . . . . . . \",
217 \" . . . . . . . . . . . . . . . \",
218 };
219 ")
220
221 (defconst sokoban-block-xpm "\
222 /* XPM */
223 static char * block_xpm[] = {
224 \"32 32 3 1\",
225 \" c None\",
226 \". c black\",
227 \"X c yellow\",
228 \"............................. \",
229 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX. \",
230 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.. \",
231 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.. \",
232 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.X. \",
233 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.X. \",
234 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
235 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
236 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
237 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
238 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
239 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
240 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
241 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
242 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
243 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
244 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
245 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
246 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
247 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
248 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
249 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
250 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
251 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
252 \".............................XX.\",
253 \".XXXXXXXXXXXXXXXXXXXXXXXXXXX.XX.\",
254 \" .XXXXXXXXXXXXXXXXXXXXXXXXXXX.X.\",
255 \" .XXXXXXXXXXXXXXXXXXXXXXXXXXX.X.\",
256 \" .XXXXXXXXXXXXXXXXXXXXXXXXXXX..\",
257 \" .XXXXXXXXXXXXXXXXXXXXXXXXXXX..\",
258 \" .XXXXXXXXXXXXXXXXXXXXXXXXXXX.\",
259 \" .............................\",
260 };
261 ")
262
263 (defconst sokoban-player-xpm "\
264 /* XPM */
265 static char * player_xpm[] = {
266 \"32 32 3 1\",
267 \" c None\",
268 \"o c white\",
269 \". c black\",
270 \" \",
271 \" \",
272 \" \",
273 \" oooooooo \",
274 \" o......o \",
275 \" o.oooooo.o \",
276 \" o.oooooo.o \",
277 \" o.oooooooo.o \",
278 \" o.o..oo..o.o \",
279 \" o.oooooooo.o \",
280 \" oo.o....o.oo \",
281 \" oo..oo..oo..oo \",
282 \" o....o..o....o \",
283 \" o.o..o..o..o.o \",
284 \" o.o...oo...o.o \",
285 \" o.oo........oo.o \",
286 \" o.oo........oo.o \",
287 \" o.ooo........ooo.o \",
288 \" o.ooo........ooo.o \",
289 \" o.ooo........ooo.o \",
290 \" o.oo........oo.o \",
291 \" o.oo........oo.o \",
292 \" o.o..........o.o \",
293 \" o............o \",
294 \" o..........o \",
295 \" o........o \",
296 \" o.o.oooo.o.o \",
297 \" o.....oo.....o \",
298 \" o......oo......o \",
299 \" o.......oo.......o \",
300 \" o..o..o..oo.oo..o..o \",
301 \" oooooooooooooooooooo \",
302 };
303 ")
304
305 (defconst sokoban-floor ?\+)
306 ;; note - space character in level file is also allowed to indicate floor
307 (defconst sokoban-target ?\.)
308 (defconst sokoban-wall ?\#)
309 (defconst sokoban-block ?\$)
310 (defconst sokoban-player ?\@)
311 (defconst sokoban-block-on-target ?\*)
312
313 ;; ;;;;;;;;;;;;; display options ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
314
315 (defvar sokoban-floor-options
316 `(((glyph
317 [xpm :data ,sokoban-floor-xpm])
318 (t ?\040))
319 ((color-x color-x)
320 (mono-x grid-x)
321 (color-tty color-tty))
322 (((glyph color-x) [0 0 0])
323 (color-tty "black"))))
324
325 (defvar sokoban-target-options
326 `(((glyph
327 [xpm :data ,sokoban-target-xpm])
328 ((mono-x mono-tty emacs-tty) ?\.)
329 (t ?\040))
330 ((color-x color-x)
331 (mono-x grid-x)
332 (color-tty color-tty))
333 (((glyph color-x) [1 1 0.5])
334 (color-tty "yellow"))))
335
336 (defvar sokoban-wall-options
337 `(((glyph
338 [xpm :data ,sokoban-wall-xpm])
339 (emacs-tty ?\X)
340 (t ?\040))
341 ((color-x color-x)
342 (mono-x mono-x)
343 (color-tty color-tty)
344 (mono-tty mono-tty))
345 (((glyph color-x) [0 0 1])
346 (color-tty "blue"))))
347
348 (defvar sokoban-block-options
349 `(((glyph
350 [xpm :data ,sokoban-block-xpm])
351 ((mono-x mono-tty emacs-tty) ?\O)
352 (t ?\040))
353 ((color-x color-x)
354 (mono-x grid-x)
355 (color-tty color-tty))
356 (((glyph color-x) [1 0 0])
357 (color-tty "red"))))
358
359 (defvar sokoban-player-options
360 `(((glyph
361 [xpm :data ,sokoban-player-xpm])
362 (t ?\*))
363 ((color-x color-x)
364 (mono-x grid-x)
365 (color-tty color-tty))
366 (((glyph color-x) [0 1 0])
367 (color-tty "green"))))
368
369 ;; ;;;;;;;;;;;;; variables ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
370
371 (defvar sokoban-level 0)
372 (make-variable-buffer-local 'sokoban-level)
373 (defvar sokoban-level-map nil)
374 (make-variable-buffer-local 'sokoban-level-map)
375 (defvar sokoban-targets 0)
376 (make-variable-buffer-local 'sokoban-targets)
377 (defvar sokoban-x 0)
378 (make-variable-buffer-local 'sokoban-x)
379 (defvar sokoban-y 0)
380 (make-variable-buffer-local 'sokoban-y)
381 (defvar sokoban-moves 0)
382 (make-variable-buffer-local 'sokoban-moves)
383 (defvar sokoban-pushes 0)
384 (make-variable-buffer-local 'sokoban-pushes)
385 (defvar sokoban-done 0)
386 (make-variable-buffer-local 'sokoban-done)
387 (defvar sokoban-mouse-x 0)
388 (make-variable-buffer-local 'sokoban-mouse-x)
389 (defvar sokoban-mouse-y 0)
390 (make-variable-buffer-local 'sokoban-mouse-y)
391 (defvar sokoban-undo-list nil)
392 (make-variable-buffer-local 'sokoban-undo-list)
393
394 ;; ;;;;;;;;;;;;; keymaps ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
395
396 (defvar sokoban-mode-map
397 (let ((map (make-sparse-keymap
398 (when (featurep 'xemacs) 'sokoban-mode-map))))
399 (define-key map "n" 'sokoban-start-game)
400 (define-key map "r" 'sokoban-restart-level)
401 (define-key map "g" 'sokoban-goto-level)
402
403 (define-key map [left] 'sokoban-move-left)
404 (define-key map [right] 'sokoban-move-right)
405 (define-key map [up] 'sokoban-move-up)
406 (define-key map [down] 'sokoban-move-down)
407
408 (when (featurep 'xemacs)
409 (define-key map [button2] 'sokoban-mouse-event-start)
410 (define-key map [button2up] 'sokoban-mouse-event-end))
411
412 (define-key map [down-mouse-2] 'sokoban-mouse-event-start)
413 (define-key map [mouse-2] 'sokoban-mouse-event-end)
414 ;; On some systems (OS X) middle mouse is difficult.
415 ;; FIXME: Use follow-link?
416 (define-key map [down-mouse-1] 'sokoban-mouse-event-start)
417 (define-key map [mouse-1] 'sokoban-mouse-event-end)
418
419 (define-key map [(control ?/)] 'sokoban-undo)
420 map))
421
422 ;; ;;;;;;;;;;;;;;;; level file parsing functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
423
424 (defconst sokoban-level-regexp "^;LEVEL [0-9]+$")
425
426 (defconst sokoban-comment-regexp "^;")
427
428 (defun sokoban-init-level-data ()
429 (setq sokoban-level-data nil)
430 (with-current-buffer (find-file-noselect sokoban-level-file)
431 (if (fboundp 'read-only-mode)
432 (read-only-mode 1)
433 (setq buffer-read-only t))
434 (goto-char (point-min))
435 (re-search-forward sokoban-level-regexp nil t)
436 (forward-char)
437 (while (not (eobp))
438 (while (looking-at sokoban-comment-regexp)
439 (forward-line))
440 (let ((data (make-vector sokoban-height nil))
441 (fmt (format "%%-%ds" sokoban-width)))
442 (dotimes (y sokoban-height)
443 (cond ((or (eobp)
444 (looking-at sokoban-comment-regexp))
445 (aset data y (format fmt "")))
446 (t
447 (let ((start (point))
448 (end (line-end-position)))
449 (aset data
450 y
451 (format fmt (buffer-substring start end)))
452 (goto-char (1+ end))))))
453 (push data sokoban-level-data)))
454 (kill-buffer (current-buffer))
455 (setq sokoban-level-data (nreverse sokoban-level-data))))
456
457 ;; ;;;;;;;;;;;;;;;; game functions ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
458
459 (defun sokoban-display-options ()
460 (let ((options (make-vector 256 nil)))
461 (dotimes (c 256)
462 (aset options c
463 (cond ((= c sokoban-floor)
464 sokoban-floor-options)
465 ((= c sokoban-target)
466 sokoban-target-options)
467 ((= c sokoban-wall)
468 sokoban-wall-options)
469 ((= c sokoban-block)
470 sokoban-block-options)
471 ((= c sokoban-player)
472 sokoban-player-options)
473 (t
474 '(nil nil nil)))))
475 options))
476
477 (defun sokoban-get-level-data ()
478 (setq sokoban-level-map (nth (1- sokoban-level) sokoban-level-data)
479 sokoban-targets 0)
480 (dotimes (y sokoban-height)
481 (dotimes (x sokoban-width)
482 (let ((c (aref (aref sokoban-level-map y) x)))
483 (cond
484 ((= c sokoban-target)
485 (incf sokoban-targets))
486 ((= c sokoban-block-on-target)
487 (incf sokoban-targets)
488 (incf sokoban-done))
489 ((= c ?\040) ;; treat space characters in level file as floor
490 (aset (aref sokoban-level-map y) x sokoban-floor)))))))
491
492 (defun sokoban-get-floor (x y)
493 (let ((c (aref (aref sokoban-level-map y) x)))
494 (if (or (= c sokoban-target)
495 (= c sokoban-block-on-target))
496 sokoban-target
497 sokoban-floor)))
498
499 (defun sokoban-init-buffer ()
500 (gamegrid-init-buffer sokoban-buffer-width
501 sokoban-buffer-height
502 ?\040)
503 (dotimes (y sokoban-height)
504 (dotimes (x sokoban-width)
505 (let ((c (aref (aref sokoban-level-map y) x)))
506 (if (= c sokoban-player)
507 (setq sokoban-x x
508 sokoban-y y))
509 (if (= c sokoban-block-on-target)
510 (setq c sokoban-block))
511 (gamegrid-set-cell x y c)))))
512
513 (defun sokoban-draw-score ()
514 (let ((strings (vector (format "Moves: %05d" sokoban-moves)
515 (format "Pushes: %05d" sokoban-pushes)
516 (format "Done: %d/%d"
517 sokoban-done
518 sokoban-targets))))
519 (dotimes (y 2)
520 (let* ((string (aref strings y))
521 (len (length string)))
522 (dotimes (x len)
523 (gamegrid-set-cell (+ sokoban-score-x x)
524 (+ sokoban-score-y y)
525 (aref string x))))))
526 (setq mode-line-format
527 (format "Sokoban: Level: %3d Moves: %05d Pushes: %05d Done: %d/%d"
528 sokoban-level sokoban-moves sokoban-pushes
529 sokoban-done sokoban-targets))
530 (force-mode-line-update))
531
532 (defun sokoban-add-move (dx dy)
533 (push (list 'move dx dy) sokoban-undo-list)
534 (incf sokoban-moves)
535 (sokoban-draw-score))
536
537 (defun sokoban-add-push (dx dy)
538 (push (list 'push dx dy) sokoban-undo-list)
539 (incf sokoban-moves)
540 (incf sokoban-pushes)
541 (sokoban-draw-score))
542
543 (defun sokoban-undo ()
544 "Undo previous Sokoban change."
545 (interactive)
546 ;; FIXME: Use the normal undo (via `apply' undo entries).
547 (if (null sokoban-undo-list)
548 (message "Nothing to undo")
549 (let* ((entry (pop sokoban-undo-list))
550 (type (car entry))
551 (dx (nth 1 entry))
552 (dy (nth 2 entry)))
553 (cond ((eq type 'push)
554 (let* ((x (+ sokoban-x dx))
555 (y (+ sokoban-y dy))
556 (c (sokoban-get-floor x y)))
557 (gamegrid-set-cell x y c)
558 (if (eq c sokoban-target)
559 (decf sokoban-done))
560 (gamegrid-set-cell sokoban-x sokoban-y sokoban-block)
561 (setq c (sokoban-get-floor sokoban-x sokoban-y))
562 (if (eq c sokoban-target)
563 (incf sokoban-done)))
564 (setq sokoban-x (- sokoban-x dx))
565 (setq sokoban-y (- sokoban-y dy))
566 (gamegrid-set-cell sokoban-x sokoban-y sokoban-player)
567 (decf sokoban-pushes)
568 (decf sokoban-moves))
569 ((eq type 'move)
570 (let ((c (sokoban-get-floor sokoban-x sokoban-y)))
571 (gamegrid-set-cell sokoban-x sokoban-y c))
572 (setq sokoban-x (- sokoban-x dx))
573 (setq sokoban-y (- sokoban-y dy))
574 (gamegrid-set-cell sokoban-x sokoban-y sokoban-player)
575 (decf sokoban-moves))
576 (t
577 (message "Invalid entry in sokoban-undo-list")))
578 (sokoban-draw-score))))
579
580 (defun sokoban-move (dx dy)
581 (let* ((x (+ sokoban-x dx))
582 (y (+ sokoban-y dy))
583 (c (gamegrid-get-cell x y)))
584 (cond ((or (eq c sokoban-floor)
585 (eq c sokoban-target))
586 (gamegrid-set-cell sokoban-x
587 sokoban-y
588 (sokoban-get-floor sokoban-x
589 sokoban-y))
590 (setq sokoban-x x
591 sokoban-y y)
592 (gamegrid-set-cell sokoban-x
593 sokoban-y
594 sokoban-player)
595 (sokoban-add-move dx dy))
596 ((eq c sokoban-block)
597 (let* ((xx (+ x dx))
598 (yy (+ y dy))
599 (cc (gamegrid-get-cell xx yy)))
600 (cond ((or (eq cc sokoban-floor)
601 (eq cc sokoban-target))
602 (if (eq (sokoban-get-floor x y) sokoban-target)
603 (decf sokoban-done))
604 (gamegrid-set-cell xx yy sokoban-block)
605 (gamegrid-set-cell x y sokoban-player)
606 (gamegrid-set-cell sokoban-x
607 sokoban-y
608 (sokoban-get-floor sokoban-x
609 sokoban-y))
610 (setq sokoban-x x
611 sokoban-y y)
612 (if (eq (sokoban-get-floor xx yy) sokoban-target)
613 (incf sokoban-done))
614 (sokoban-add-push dx dy)
615 (cond ((= sokoban-done sokoban-targets)
616 (sit-for 3)
617 (sokoban-next-level))))))))))
618
619 (defun sokoban-event-x (event)
620 (let ((x (gamegrid-event-x event)))
621 (if (featurep 'xemacs)
622 x
623 ;; 32.0 is the pixel width of the xpm image
624 (floor x (/ 32.0 (frame-char-width))))))
625
626 (defun sokoban-event-y (event)
627 (let ((y (gamegrid-event-y event)))
628 (if (featurep 'xemacs)
629 y
630 (floor y (/ 32.0 (frame-char-height))))))
631
632 (defun sokoban-mouse-event-start (event)
633 "Record the beginning of a mouse click."
634 (interactive "e")
635 (setq sokoban-mouse-x (sokoban-event-x event))
636 (setq sokoban-mouse-y (sokoban-event-y event)))
637
638 (defun sokoban-mouse-event-end (event)
639 "Move according to the clicked position."
640 (interactive "e")
641 (let* ((x (sokoban-event-x event))
642 (y (sokoban-event-y event))
643 (dx (- x sokoban-x))
644 (dy (- y sokoban-y)))
645 (cond
646 ;; Ensure that press and release are in the same square
647 ;; (which allows you to abort a move)
648 ((not (and (eq sokoban-mouse-x x) (eq sokoban-mouse-y y)))
649 nil)
650 ;; Check that the move isn't diagonal
651 ((not (or (eq dx 0) (eq dy 0)))
652 nil)
653 ((< dx 0) ;; Left
654 (while (< dx 0)
655 (sokoban-move -1 0)
656 (setq dx (1+ dx))))
657 ((> dx 0) ;; Right
658 (while (> dx 0)
659 (sokoban-move 1 0)
660 (setq dx (1- dx))))
661 ((> dy 0) ;; Up
662 (while (> dy 0)
663 (sokoban-move 0 1)
664 (setq dy (1- dy))))
665 ((< dy 0) ;; Down
666 (while (< dy 0)
667 (sokoban-move 0 -1)
668 (setq dy (1+ dy)))))))
669
670 (defun sokoban-move-left ()
671 "Move one square left."
672 (interactive)
673 (sokoban-move -1 0))
674
675 (defun sokoban-move-right ()
676 "Move one square right."
677 (interactive)
678 (sokoban-move 1 0))
679
680 (defun sokoban-move-up ()
681 "Move one square up."
682 (interactive)
683 (sokoban-move 0 -1))
684
685 (defun sokoban-move-down ()
686 "Move one square down."
687 (interactive)
688 (sokoban-move 0 1))
689
690 (defun sokoban-restart-level ()
691 "Restart the current level."
692 (interactive)
693 (setq sokoban-moves 0
694 sokoban-pushes 0
695 sokoban-done 0
696 sokoban-undo-list nil)
697 (sokoban-get-level-data)
698 (sokoban-init-buffer)
699 (sokoban-draw-score))
700
701 (defun sokoban-next-level ()
702 (incf sokoban-level)
703 (sokoban-restart-level))
704
705 (defun sokoban-goto-level (level)
706 "Jump to a specified LEVEL."
707 (interactive "nLevel: ")
708 (when (or (< level 1)
709 (> level (length sokoban-level-data)))
710 (signal 'args-out-of-range
711 (list "No such level number"
712 level 1 (> level (length sokoban-level-data)))))
713 (setq sokoban-level level)
714 (sokoban-restart-level))
715
716 (defun sokoban-start-game ()
717 "Start a new game of Sokoban."
718 (interactive)
719 (setq sokoban-level 0)
720 (sokoban-next-level))
721
722 (put 'sokoban-mode 'mode-class 'special)
723
724 (unless (featurep 'xemacs)
725 (easy-menu-define sokoban-popup-menu nil "Popup menu for Sokoban mode."
726 '("Sokoban Commands"
727 ["Restart this level" sokoban-restart-level]
728 ["Start new game" sokoban-start-game]
729 ["Go to specific level" sokoban-goto-level]))
730 (define-key sokoban-mode-map [down-mouse-3] sokoban-popup-menu))
731
732 (define-derived-mode sokoban-mode special-mode "Sokoban"
733 "A mode for playing Sokoban.
734
735 sokoban-mode keybindings:
736 \\{sokoban-mode-map}"
737
738 (when (featurep 'xemacs)
739 (setq mode-popup-menu
740 '("Sokoban Commands"
741 ["Restart this level" sokoban-restart-level]
742 ["Start new game" sokoban-start-game]
743 ["Go to specific level" sokoban-goto-level])))
744
745 (set (make-local-variable 'gamegrid-use-glyphs) sokoban-use-glyphs)
746 (set (make-local-variable 'gamegrid-use-color) sokoban-use-color)
747 (set (make-local-variable 'gamegrid-font) sokoban-font)
748
749 (gamegrid-init (sokoban-display-options))
750
751 (if (null sokoban-level-data)
752 (sokoban-init-level-data)))
753
754 ;;;###autoload
755 (defun sokoban ()
756 "Sokoban.
757
758 Push the blocks onto the target squares.
759
760 sokoban-mode keybindings:
761 \\<sokoban-mode-map>
762 \\[sokoban-start-game] Starts a new game of Sokoban
763 \\[sokoban-restart-level] Restarts the current level
764 \\[sokoban-goto-level] Jumps to a specified level
765 \\[sokoban-move-left] Move one square to the left
766 \\[sokoban-move-right] Move one square to the right
767 \\[sokoban-move-up] Move one square up
768 \\[sokoban-move-down] Move one square down"
769 (interactive)
770
771 (switch-to-buffer sokoban-buffer-name)
772 (gamegrid-kill-timer)
773 (sokoban-mode)
774 (sokoban-start-game))
775
776 ;;;###autoload
777 (unless (featurep 'xemacs)
778 (define-key-after ; install a menu entry
779 (lookup-key global-map [menu-bar tools games])
780 [sokoban]
781 '(menu-item "Sokoban" sokoban)
782 'snake))
783
784 (provide 'sokoban)
785
786 ;;; sokoban.el ends here
787