Commit | Line | Data |
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5f72adc0 | 1 | ;;; pong.el --- classical implementation of pong |
c1475eae | 2 | |
d7a0267c GM |
3 | ;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, |
4 | ;; 2005, 2006, 2007 Free Software Foundation, Inc. | |
c1475eae | 5 | |
9781053a | 6 | ;; Author: Benjamin Drieu <bdrieu@april.org> |
c1475eae GM |
7 | ;; Keywords: games |
8 | ||
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 | |
5a9dffec | 13 | ;; the Free Software Foundation; either version 3, or (at your option) |
c1475eae GM |
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 | |
22 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
3a35cf56 LK |
23 | ;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
24 | ;; Boston, MA 02110-1301, USA. | |
c1475eae GM |
25 | |
26 | ;;; Commentary: | |
27 | ||
28 | ;; This is an implementation of the classical game pong. | |
29 | ||
30 | ;;; Code: | |
31 | ||
32 | (eval-when-compile (require 'cl)) | |
33 | ||
34 | (require 'gamegrid) | |
35 | ||
36 | ;;; Customization | |
37 | ||
a1506d29 | 38 | (defgroup pong nil |
c1475eae GM |
39 | "Emacs-Lisp implementation of the classical game pong." |
40 | :tag "Pong" | |
41 | :group 'games) | |
42 | ||
a1506d29 | 43 | (defcustom pong-buffer-name "*Pong*" |
c1475eae GM |
44 | "*Name of the buffer used to play." |
45 | :group 'pong | |
46 | :type '(string)) | |
47 | ||
48 | (defcustom pong-width 50 | |
49 | "*Width of the playfield." | |
50 | :group 'pong | |
51 | :type '(integer)) | |
52 | ||
e029dcaf | 53 | (defcustom pong-height (min 30 (- (frame-height) 6)) |
c1475eae GM |
54 | "*Height of the playfield." |
55 | :group 'pong | |
56 | :type '(integer)) | |
57 | ||
58 | (defcustom pong-bat-width 3 | |
59 | "*Width of the bats for pong." | |
60 | :group 'pong | |
61 | :type '(integer)) | |
62 | ||
63 | (defcustom pong-blank-color "black" | |
64 | "*Color used for background." | |
65 | :group 'pong | |
a430ca88 | 66 | :type 'color) |
c1475eae GM |
67 | |
68 | (defcustom pong-bat-color "yellow" | |
69 | "*Color used for bats." | |
70 | :group 'pong | |
a430ca88 | 71 | :type 'color) |
c1475eae GM |
72 | |
73 | (defcustom pong-ball-color "red" | |
74 | "*Color used for the ball." | |
75 | :group 'pong | |
a430ca88 | 76 | :type 'color) |
c1475eae GM |
77 | |
78 | (defcustom pong-border-color "white" | |
6add7517 | 79 | "*Color used for pong borders." |
c1475eae | 80 | :group 'pong |
a430ca88 | 81 | :type 'color) |
c1475eae GM |
82 | |
83 | (defcustom pong-left-key "4" | |
84 | "*Alternate key to press for bat 1 to go up (primary one is [left])." | |
85 | :group 'pong | |
a430ca88 | 86 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
87 | |
88 | (defcustom pong-right-key "6" | |
89 | "*Alternate key to press for bat 1 to go down (primary one is [right])." | |
90 | :group 'pong | |
a430ca88 | 91 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
92 | |
93 | (defcustom pong-up-key "8" | |
94 | "*Alternate key to press for bat 2 to go up (primary one is [up])." | |
95 | :group 'pong | |
a430ca88 | 96 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
97 | |
98 | (defcustom pong-down-key "2" | |
99 | "*Alternate key to press for bat 2 to go down (primary one is [down])." | |
100 | :group 'pong | |
a430ca88 | 101 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
102 | |
103 | (defcustom pong-quit-key "q" | |
104 | "*Key to press to quit pong." | |
105 | :group 'pong | |
a430ca88 | 106 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
107 | |
108 | (defcustom pong-pause-key "p" | |
109 | "Key to press to pause pong." | |
110 | :group 'pong | |
a430ca88 | 111 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
112 | |
113 | (defcustom pong-resume-key "p" | |
114 | "*Key to press to resume pong." | |
115 | :group 'pong | |
a430ca88 | 116 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
117 | |
118 | (defcustom pong-timer-delay 0.1 | |
119 | "*Time to wait between every cycle." | |
120 | :group 'pong | |
a430ca88 | 121 | :type 'number) |
c1475eae GM |
122 | |
123 | ||
124 | ;;; This is black magic. Define colors used | |
125 | ||
126 | (defvar pong-blank-options | |
127 | '(((glyph colorize) | |
128 | (t ?\040)) | |
129 | ((color-x color-x) | |
130 | (mono-x grid-x) | |
131 | (color-tty color-tty)) | |
132 | (((glyph color-x) [0 0 0]) | |
133 | (color-tty pong-blank-color)))) | |
134 | ||
135 | (defvar pong-bat-options | |
136 | '(((glyph colorize) | |
137 | (emacs-tty ?O) | |
138 | (t ?\040)) | |
139 | ((color-x color-x) | |
140 | (mono-x mono-x) | |
141 | (color-tty color-tty) | |
142 | (mono-tty mono-tty)) | |
143 | (((glyph color-x) [1 1 0]) | |
144 | (color-tty pong-bat-color)))) | |
145 | ||
146 | (defvar pong-ball-options | |
147 | '(((glyph colorize) | |
148 | (t ?\*)) | |
149 | ((color-x color-x) | |
150 | (mono-x grid-x) | |
151 | (color-tty color-tty)) | |
152 | (((glyph color-x) [1 0 0]) | |
153 | (color-tty pong-ball-color)))) | |
154 | ||
155 | (defvar pong-border-options | |
156 | '(((glyph colorize) | |
157 | (t ?\+)) | |
158 | ((color-x color-x) | |
6add7517 FP |
159 | (mono-x grid-x) |
160 | (color-tty color-tty)) | |
161 | (((glyph color-x) [0.5 0.5 0.5]) | |
c1475eae GM |
162 | (color-tty pong-border-color)))) |
163 | ||
164 | (defconst pong-blank 0) | |
165 | (defconst pong-bat 1) | |
166 | (defconst pong-ball 2) | |
167 | (defconst pong-border 3) | |
168 | ||
169 | ||
170 | ;;; Determine initial positions for bats and ball | |
171 | ||
172 | (defvar pong-xx nil | |
173 | "Horizontal speed of the ball.") | |
174 | ||
175 | (defvar pong-yy nil | |
176 | "Vertical speed of the ball.") | |
177 | ||
178 | (defvar pong-x nil | |
179 | "Horizontal position of the ball.") | |
180 | ||
181 | (defvar pong-y nil | |
182 | "Vertical position of the ball.") | |
183 | ||
184 | (defvar pong-bat-player1 nil | |
185 | "Vertical position of bat 1.") | |
186 | ||
187 | (defvar pong-bat-player2 nil | |
188 | "Vertical position of bat 2.") | |
189 | ||
190 | (defvar pong-score-player1 nil) | |
191 | (defvar pong-score-player2 nil) | |
192 | ||
193 | ;;; Initialize maps | |
194 | ||
195 | (defvar pong-mode-map | |
196 | (make-sparse-keymap 'pong-mode-map) "Modemap for pong-mode.") | |
197 | ||
198 | (defvar pong-null-map | |
199 | (make-sparse-keymap 'pong-null-map) "Null map for pong-mode.") | |
200 | ||
201 | (define-key pong-mode-map [left] 'pong-move-left) | |
202 | (define-key pong-mode-map [right] 'pong-move-right) | |
203 | (define-key pong-mode-map [up] 'pong-move-up) | |
204 | (define-key pong-mode-map [down] 'pong-move-down) | |
205 | (define-key pong-mode-map pong-left-key 'pong-move-left) | |
206 | (define-key pong-mode-map pong-right-key 'pong-move-right) | |
207 | (define-key pong-mode-map pong-up-key 'pong-move-up) | |
208 | (define-key pong-mode-map pong-down-key 'pong-move-down) | |
209 | (define-key pong-mode-map pong-quit-key 'pong-quit) | |
210 | (define-key pong-mode-map pong-pause-key 'pong-pause) | |
211 | ||
212 | ||
213 | ;;; Fun stuff -- The code | |
214 | ||
215 | (defun pong-display-options () | |
216 | "Computes display options (required by gamegrid for colors)." | |
217 | (let ((options (make-vector 256 nil))) | |
218 | (loop for c from 0 to 255 do | |
219 | (aset options c | |
220 | (cond ((= c pong-blank) | |
221 | pong-blank-options) | |
222 | ((= c pong-bat) | |
223 | pong-bat-options) | |
224 | ((= c pong-ball) | |
225 | pong-ball-options) | |
226 | ((= c pong-border) | |
227 | pong-border-options) | |
228 | (t | |
229 | '(nil nil nil))))) | |
230 | options)) | |
231 | ||
232 | ||
233 | ||
234 | (defun pong-init-buffer () | |
235 | "Initialize pong buffer and draw stuff thanks to gamegrid library." | |
236 | (interactive) | |
237 | (get-buffer-create pong-buffer-name) | |
238 | (switch-to-buffer pong-buffer-name) | |
239 | (use-local-map pong-mode-map) | |
240 | ||
241 | (setq gamegrid-use-glyphs t) | |
242 | (setq gamegrid-use-color t) | |
243 | (gamegrid-init (pong-display-options)) | |
244 | ||
245 | (gamegrid-init-buffer pong-width | |
246 | (+ 2 pong-height) | |
f47adf18 | 247 | ?\s) |
c1475eae GM |
248 | |
249 | (let ((buffer-read-only nil)) | |
250 | (loop for y from 0 to (1- pong-height) do | |
251 | (loop for x from 0 to (1- pong-width) do | |
252 | (gamegrid-set-cell x y pong-border))) | |
253 | (loop for y from 1 to (- pong-height 2) do | |
254 | (loop for x from 1 to (- pong-width 2) do | |
255 | (gamegrid-set-cell x y pong-blank)))) | |
256 | ||
257 | (loop for y from pong-bat-player1 to (1- (+ pong-bat-player1 pong-bat-width)) do | |
258 | (gamegrid-set-cell 2 y pong-bat)) | |
259 | (loop for y from pong-bat-player2 to (1- (+ pong-bat-player2 pong-bat-width)) do | |
260 | (gamegrid-set-cell (- pong-width 3) y pong-bat))) | |
261 | ||
262 | ||
263 | ||
264 | (defun pong-move-left () | |
265 | "Move bat 2 up. | |
266 | This is called left for historical reasons, since in some pong | |
267 | implementations you move with left/right paddle." | |
268 | (interactive) | |
269 | (if (> pong-bat-player1 1) | |
270 | (and | |
271 | (setq pong-bat-player1 (1- pong-bat-player1)) | |
272 | (pong-update-bat 2 pong-bat-player1)))) | |
273 | ||
274 | ||
275 | ||
276 | (defun pong-move-right () | |
277 | "Move bat 2 up." | |
278 | (interactive) | |
279 | (if (< (+ pong-bat-player1 pong-bat-width) (1- pong-height)) | |
280 | (and | |
281 | (setq pong-bat-player1 (1+ pong-bat-player1)) | |
282 | (pong-update-bat 2 pong-bat-player1)))) | |
283 | ||
284 | ||
285 | ||
286 | (defun pong-move-up () | |
287 | "Move bat 2 up." | |
288 | (interactive) | |
289 | (if (> pong-bat-player2 1) | |
290 | (and | |
291 | (setq pong-bat-player2 (1- pong-bat-player2)) | |
292 | (pong-update-bat (- pong-width 3) pong-bat-player2)))) | |
293 | ||
294 | ||
295 | ||
296 | (defun pong-move-down () | |
297 | "Move bat 2 down." | |
298 | (interactive) | |
299 | (if (< (+ pong-bat-player2 pong-bat-width) (1- pong-height)) | |
300 | (and | |
301 | (setq pong-bat-player2 (1+ pong-bat-player2)) | |
302 | (pong-update-bat (- pong-width 3) pong-bat-player2)))) | |
303 | ||
304 | ||
305 | ||
306 | (defun pong-update-bat (x y) | |
307 | "Move a bat (suppress a cell and draw another one on the other side)." | |
308 | ||
309 | (cond | |
310 | ((string-equal (buffer-name (current-buffer)) pong-buffer-name) | |
311 | (gamegrid-set-cell x y pong-bat) | |
312 | (gamegrid-set-cell x (1- (+ y pong-bat-width)) pong-bat) | |
313 | (if (> y 1) | |
314 | (gamegrid-set-cell x (1- y) pong-blank)) | |
315 | (if (< (+ y pong-bat-width) (1- pong-height)) | |
316 | (gamegrid-set-cell x (+ y pong-bat-width) pong-blank))))) | |
a1506d29 | 317 | |
c1475eae GM |
318 | |
319 | ||
320 | (defun pong-init () | |
321 | "Initialize a game." | |
a1506d29 | 322 | |
c1475eae GM |
323 | (define-key pong-mode-map pong-pause-key 'pong-pause) |
324 | ||
c1475eae GM |
325 | (add-hook 'kill-buffer-hook 'pong-quit nil t) |
326 | ||
327 | ;; Initialization of some variables | |
328 | (setq pong-bat-player1 (1+ (/ (- pong-height pong-bat-width) 2))) | |
329 | (setq pong-bat-player2 pong-bat-player1) | |
330 | (setq pong-xx -1) | |
331 | (setq pong-yy 0) | |
332 | (setq pong-x (/ pong-width 2)) | |
333 | (setq pong-y (/ pong-height 2)) | |
334 | ||
335 | (pong-init-buffer) | |
336 | (gamegrid-kill-timer) | |
337 | (gamegrid-start-timer pong-timer-delay 'pong-update-game) | |
338 | (pong-update-score)) | |
339 | ||
340 | ||
341 | ||
342 | (defun pong-update-game (pong-buffer) | |
343 | "\"Main\" function for pong. | |
344 | It is called every pong-cycle-delay seconds and | |
345 | updates ball and bats positions. It is responsible of collision | |
346 | detection and checks if a player scores." | |
347 | (if (not (eq (current-buffer) pong-buffer)) | |
348 | (pong-pause) | |
a1506d29 | 349 | |
c1475eae GM |
350 | (let ((old-x pong-x) |
351 | (old-y pong-y)) | |
a1506d29 | 352 | |
c1475eae GM |
353 | (setq pong-x (+ pong-x pong-xx)) |
354 | (setq pong-y (+ pong-y pong-yy)) | |
a1506d29 | 355 | |
c1475eae GM |
356 | (if (and (> old-y 0) |
357 | (< old-y (- pong-height 1))) | |
358 | (gamegrid-set-cell old-x old-y pong-blank)) | |
a1506d29 | 359 | |
c1475eae GM |
360 | (if (and (> pong-y 0) |
361 | (< pong-y (- pong-height 1))) | |
362 | (gamegrid-set-cell pong-x pong-y pong-ball)) | |
a1506d29 | 363 | |
c1475eae GM |
364 | (cond |
365 | ((or (= pong-x 3) (= pong-x 2)) | |
a1506d29 | 366 | (if (and (>= pong-y pong-bat-player1) |
c1475eae | 367 | (< pong-y (+ pong-bat-player1 pong-bat-width))) |
a1506d29 | 368 | (and |
c1475eae | 369 | (setq pong-yy (+ pong-yy |
a1506d29 | 370 | (cond |
c1475eae GM |
371 | ((= pong-y pong-bat-player1) -1) |
372 | ((= pong-y (1+ pong-bat-player1)) 0) | |
373 | (t 1)))) | |
374 | (setq pong-xx (- pong-xx))))) | |
375 | ||
376 | ((or (= pong-x (- pong-width 4)) (= pong-x (- pong-width 3))) | |
a1506d29 | 377 | (if (and (>= pong-y pong-bat-player2) |
c1475eae | 378 | (< pong-y (+ pong-bat-player2 pong-bat-width))) |
a1506d29 | 379 | (and |
c1475eae | 380 | (setq pong-yy (+ pong-yy |
a1506d29 | 381 | (cond |
c1475eae GM |
382 | ((= pong-y pong-bat-player2) -1) |
383 | ((= pong-y (1+ pong-bat-player2)) 0) | |
384 | (t 1)))) | |
385 | (setq pong-xx (- pong-xx))))) | |
a1506d29 | 386 | |
c1475eae GM |
387 | ((<= pong-y 1) |
388 | (setq pong-yy (- pong-yy))) | |
389 | ||
390 | ((>= pong-y (- pong-height 2)) | |
391 | (setq pong-yy (- pong-yy))) | |
392 | ||
393 | ((< pong-x 1) | |
394 | (setq pong-score-player2 (1+ pong-score-player2)) | |
395 | (pong-init)) | |
396 | ||
397 | ((>= pong-x (- pong-width 1)) | |
398 | (setq pong-score-player1 (1+ pong-score-player1)) | |
399 | (pong-init)))))) | |
400 | ||
401 | ||
402 | ||
403 | (defun pong-update-score () | |
404 | "Update score and print it on bottom of the game grid." | |
405 | (let* ((string (format "Score: %d / %d" pong-score-player1 pong-score-player2)) | |
406 | (len (length string))) | |
407 | (loop for x from 0 to (1- len) do | |
408 | (if (string-equal (buffer-name (current-buffer)) pong-buffer-name) | |
409 | (gamegrid-set-cell x | |
410 | pong-height | |
411 | (aref string x)))))) | |
412 | ||
413 | ||
414 | ||
415 | (defun pong-pause () | |
416 | "Pause the game." | |
417 | (interactive) | |
418 | (gamegrid-kill-timer) | |
419 | ;; Oooohhh ugly. I don't know why, gamegrid-kill-timer don't do the | |
420 | ;; jobs it is made for. So I have to do it "by hand". Anyway, next | |
421 | ;; line is harmless. | |
422 | (cancel-function-timers 'pong-update-game) | |
423 | (define-key pong-mode-map pong-resume-key 'pong-resume)) | |
424 | ||
425 | ||
426 | ||
427 | (defun pong-resume () | |
428 | "Resume a paused game." | |
429 | (interactive) | |
430 | (define-key pong-mode-map pong-pause-key 'pong-pause) | |
431 | (gamegrid-start-timer pong-timer-delay 'pong-update-game)) | |
432 | ||
433 | ||
434 | ||
435 | (defun pong-quit () | |
436 | "Quit the game and kill the pong buffer." | |
437 | (interactive) | |
438 | (gamegrid-kill-timer) | |
439 | ;; Be sure not to draw things in another buffer and wait for some | |
440 | ;; time. | |
441 | (run-with-timer pong-timer-delay nil 'kill-buffer pong-buffer-name)) | |
442 | ||
443 | ||
444 | ||
445 | ;;;###autoload | |
446 | (defun pong () | |
447 | "Play pong and waste time. | |
448 | This is an implementation of the classical game pong. | |
449 | Move left and right bats and try to bounce the ball to your opponent. | |
450 | ||
e8951be0 | 451 | pong-mode keybindings:\\<pong-mode-map> |
c1475eae | 452 | |
e8951be0 | 453 | \\{pong-mode-map}" |
c1475eae GM |
454 | (interactive) |
455 | (setq pong-score-player1 0) | |
456 | (setq pong-score-player2 0) | |
457 | (pong-init)) | |
458 | ||
459 | ||
460 | ||
461 | (provide 'pong) | |
6e44da43 | 462 | |
ab5796a9 | 463 | ;;; arch-tag: 1fdf0fc5-13e2-4de4-aae4-09bdd5af99f3 |
6e44da43 | 464 | ;;; pong.el ends here |