Commit | Line | Data |
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5f72adc0 | 1 | ;;; pong.el --- classical implementation of pong |
c1475eae | 2 | |
d7a0267c | 3 | ;; Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, |
ae940284 | 4 | ;; 2005, 2006, 2007, 2008, 2009 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 | ||
b1fc2b50 | 11 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
c1475eae | 12 | ;; it under the terms of the GNU General Public License as published by |
b1fc2b50 GM |
13 | ;; the Free Software Foundation, either version 3 of the License, or |
14 | ;; (at your option) any later version. | |
c1475eae GM |
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 | |
b1fc2b50 | 22 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
c1475eae GM |
23 | |
24 | ;;; Commentary: | |
25 | ||
26 | ;; This is an implementation of the classical game pong. | |
27 | ||
28 | ;;; Code: | |
29 | ||
30 | (eval-when-compile (require 'cl)) | |
31 | ||
32 | (require 'gamegrid) | |
33 | ||
34 | ;;; Customization | |
35 | ||
a1506d29 | 36 | (defgroup pong nil |
c1475eae GM |
37 | "Emacs-Lisp implementation of the classical game pong." |
38 | :tag "Pong" | |
39 | :group 'games) | |
40 | ||
a1506d29 | 41 | (defcustom pong-buffer-name "*Pong*" |
c1475eae GM |
42 | "*Name of the buffer used to play." |
43 | :group 'pong | |
44 | :type '(string)) | |
45 | ||
46 | (defcustom pong-width 50 | |
47 | "*Width of the playfield." | |
48 | :group 'pong | |
49 | :type '(integer)) | |
50 | ||
e029dcaf | 51 | (defcustom pong-height (min 30 (- (frame-height) 6)) |
c1475eae GM |
52 | "*Height of the playfield." |
53 | :group 'pong | |
54 | :type '(integer)) | |
55 | ||
56 | (defcustom pong-bat-width 3 | |
57 | "*Width of the bats for pong." | |
58 | :group 'pong | |
59 | :type '(integer)) | |
60 | ||
61 | (defcustom pong-blank-color "black" | |
62 | "*Color used for background." | |
63 | :group 'pong | |
a430ca88 | 64 | :type 'color) |
c1475eae GM |
65 | |
66 | (defcustom pong-bat-color "yellow" | |
67 | "*Color used for bats." | |
68 | :group 'pong | |
a430ca88 | 69 | :type 'color) |
c1475eae GM |
70 | |
71 | (defcustom pong-ball-color "red" | |
72 | "*Color used for the ball." | |
73 | :group 'pong | |
a430ca88 | 74 | :type 'color) |
c1475eae GM |
75 | |
76 | (defcustom pong-border-color "white" | |
6add7517 | 77 | "*Color used for pong borders." |
c1475eae | 78 | :group 'pong |
a430ca88 | 79 | :type 'color) |
c1475eae GM |
80 | |
81 | (defcustom pong-left-key "4" | |
82 | "*Alternate key to press for bat 1 to go up (primary one is [left])." | |
83 | :group 'pong | |
a430ca88 | 84 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
85 | |
86 | (defcustom pong-right-key "6" | |
87 | "*Alternate key to press for bat 1 to go down (primary one is [right])." | |
88 | :group 'pong | |
a430ca88 | 89 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
90 | |
91 | (defcustom pong-up-key "8" | |
92 | "*Alternate key to press for bat 2 to go up (primary one is [up])." | |
93 | :group 'pong | |
a430ca88 | 94 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
95 | |
96 | (defcustom pong-down-key "2" | |
97 | "*Alternate key to press for bat 2 to go down (primary one is [down])." | |
98 | :group 'pong | |
a430ca88 | 99 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
100 | |
101 | (defcustom pong-quit-key "q" | |
102 | "*Key to press to quit pong." | |
103 | :group 'pong | |
a430ca88 | 104 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
105 | |
106 | (defcustom pong-pause-key "p" | |
107 | "Key to press to pause pong." | |
108 | :group 'pong | |
a430ca88 | 109 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
110 | |
111 | (defcustom pong-resume-key "p" | |
112 | "*Key to press to resume pong." | |
113 | :group 'pong | |
a430ca88 | 114 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
115 | |
116 | (defcustom pong-timer-delay 0.1 | |
117 | "*Time to wait between every cycle." | |
118 | :group 'pong | |
a430ca88 | 119 | :type 'number) |
c1475eae GM |
120 | |
121 | ||
122 | ;;; This is black magic. Define colors used | |
123 | ||
124 | (defvar pong-blank-options | |
125 | '(((glyph colorize) | |
126 | (t ?\040)) | |
127 | ((color-x color-x) | |
128 | (mono-x grid-x) | |
129 | (color-tty color-tty)) | |
130 | (((glyph color-x) [0 0 0]) | |
131 | (color-tty pong-blank-color)))) | |
132 | ||
133 | (defvar pong-bat-options | |
134 | '(((glyph colorize) | |
135 | (emacs-tty ?O) | |
136 | (t ?\040)) | |
137 | ((color-x color-x) | |
138 | (mono-x mono-x) | |
139 | (color-tty color-tty) | |
140 | (mono-tty mono-tty)) | |
141 | (((glyph color-x) [1 1 0]) | |
142 | (color-tty pong-bat-color)))) | |
143 | ||
144 | (defvar pong-ball-options | |
145 | '(((glyph colorize) | |
146 | (t ?\*)) | |
147 | ((color-x color-x) | |
148 | (mono-x grid-x) | |
149 | (color-tty color-tty)) | |
150 | (((glyph color-x) [1 0 0]) | |
151 | (color-tty pong-ball-color)))) | |
152 | ||
153 | (defvar pong-border-options | |
154 | '(((glyph colorize) | |
155 | (t ?\+)) | |
156 | ((color-x color-x) | |
6add7517 FP |
157 | (mono-x grid-x) |
158 | (color-tty color-tty)) | |
159 | (((glyph color-x) [0.5 0.5 0.5]) | |
c1475eae GM |
160 | (color-tty pong-border-color)))) |
161 | ||
162 | (defconst pong-blank 0) | |
163 | (defconst pong-bat 1) | |
164 | (defconst pong-ball 2) | |
165 | (defconst pong-border 3) | |
166 | ||
167 | ||
168 | ;;; Determine initial positions for bats and ball | |
169 | ||
170 | (defvar pong-xx nil | |
171 | "Horizontal speed of the ball.") | |
172 | ||
173 | (defvar pong-yy nil | |
174 | "Vertical speed of the ball.") | |
175 | ||
176 | (defvar pong-x nil | |
177 | "Horizontal position of the ball.") | |
178 | ||
179 | (defvar pong-y nil | |
180 | "Vertical position of the ball.") | |
181 | ||
182 | (defvar pong-bat-player1 nil | |
183 | "Vertical position of bat 1.") | |
184 | ||
185 | (defvar pong-bat-player2 nil | |
186 | "Vertical position of bat 2.") | |
187 | ||
188 | (defvar pong-score-player1 nil) | |
189 | (defvar pong-score-player2 nil) | |
190 | ||
191 | ;;; Initialize maps | |
192 | ||
193 | (defvar pong-mode-map | |
194 | (make-sparse-keymap 'pong-mode-map) "Modemap for pong-mode.") | |
195 | ||
196 | (defvar pong-null-map | |
197 | (make-sparse-keymap 'pong-null-map) "Null map for pong-mode.") | |
198 | ||
199 | (define-key pong-mode-map [left] 'pong-move-left) | |
200 | (define-key pong-mode-map [right] 'pong-move-right) | |
201 | (define-key pong-mode-map [up] 'pong-move-up) | |
202 | (define-key pong-mode-map [down] 'pong-move-down) | |
203 | (define-key pong-mode-map pong-left-key 'pong-move-left) | |
204 | (define-key pong-mode-map pong-right-key 'pong-move-right) | |
205 | (define-key pong-mode-map pong-up-key 'pong-move-up) | |
206 | (define-key pong-mode-map pong-down-key 'pong-move-down) | |
207 | (define-key pong-mode-map pong-quit-key 'pong-quit) | |
208 | (define-key pong-mode-map pong-pause-key 'pong-pause) | |
209 | ||
210 | ||
211 | ;;; Fun stuff -- The code | |
212 | ||
213 | (defun pong-display-options () | |
214 | "Computes display options (required by gamegrid for colors)." | |
215 | (let ((options (make-vector 256 nil))) | |
216 | (loop for c from 0 to 255 do | |
217 | (aset options c | |
218 | (cond ((= c pong-blank) | |
219 | pong-blank-options) | |
220 | ((= c pong-bat) | |
221 | pong-bat-options) | |
222 | ((= c pong-ball) | |
223 | pong-ball-options) | |
224 | ((= c pong-border) | |
225 | pong-border-options) | |
226 | (t | |
227 | '(nil nil nil))))) | |
228 | options)) | |
229 | ||
230 | ||
231 | ||
232 | (defun pong-init-buffer () | |
233 | "Initialize pong buffer and draw stuff thanks to gamegrid library." | |
234 | (interactive) | |
235 | (get-buffer-create pong-buffer-name) | |
236 | (switch-to-buffer pong-buffer-name) | |
237 | (use-local-map pong-mode-map) | |
238 | ||
239 | (setq gamegrid-use-glyphs t) | |
240 | (setq gamegrid-use-color t) | |
241 | (gamegrid-init (pong-display-options)) | |
242 | ||
243 | (gamegrid-init-buffer pong-width | |
244 | (+ 2 pong-height) | |
f47adf18 | 245 | ?\s) |
c1475eae GM |
246 | |
247 | (let ((buffer-read-only nil)) | |
248 | (loop for y from 0 to (1- pong-height) do | |
249 | (loop for x from 0 to (1- pong-width) do | |
250 | (gamegrid-set-cell x y pong-border))) | |
251 | (loop for y from 1 to (- pong-height 2) do | |
252 | (loop for x from 1 to (- pong-width 2) do | |
253 | (gamegrid-set-cell x y pong-blank)))) | |
254 | ||
255 | (loop for y from pong-bat-player1 to (1- (+ pong-bat-player1 pong-bat-width)) do | |
256 | (gamegrid-set-cell 2 y pong-bat)) | |
257 | (loop for y from pong-bat-player2 to (1- (+ pong-bat-player2 pong-bat-width)) do | |
258 | (gamegrid-set-cell (- pong-width 3) y pong-bat))) | |
259 | ||
260 | ||
261 | ||
262 | (defun pong-move-left () | |
263 | "Move bat 2 up. | |
264 | This is called left for historical reasons, since in some pong | |
265 | implementations you move with left/right paddle." | |
266 | (interactive) | |
267 | (if (> pong-bat-player1 1) | |
268 | (and | |
269 | (setq pong-bat-player1 (1- pong-bat-player1)) | |
270 | (pong-update-bat 2 pong-bat-player1)))) | |
271 | ||
272 | ||
273 | ||
274 | (defun pong-move-right () | |
275 | "Move bat 2 up." | |
276 | (interactive) | |
277 | (if (< (+ pong-bat-player1 pong-bat-width) (1- pong-height)) | |
278 | (and | |
279 | (setq pong-bat-player1 (1+ pong-bat-player1)) | |
280 | (pong-update-bat 2 pong-bat-player1)))) | |
281 | ||
282 | ||
283 | ||
284 | (defun pong-move-up () | |
285 | "Move bat 2 up." | |
286 | (interactive) | |
287 | (if (> pong-bat-player2 1) | |
288 | (and | |
289 | (setq pong-bat-player2 (1- pong-bat-player2)) | |
290 | (pong-update-bat (- pong-width 3) pong-bat-player2)))) | |
291 | ||
292 | ||
293 | ||
294 | (defun pong-move-down () | |
295 | "Move bat 2 down." | |
296 | (interactive) | |
297 | (if (< (+ pong-bat-player2 pong-bat-width) (1- pong-height)) | |
298 | (and | |
299 | (setq pong-bat-player2 (1+ pong-bat-player2)) | |
300 | (pong-update-bat (- pong-width 3) pong-bat-player2)))) | |
301 | ||
302 | ||
303 | ||
304 | (defun pong-update-bat (x y) | |
305 | "Move a bat (suppress a cell and draw another one on the other side)." | |
306 | ||
307 | (cond | |
308 | ((string-equal (buffer-name (current-buffer)) pong-buffer-name) | |
309 | (gamegrid-set-cell x y pong-bat) | |
310 | (gamegrid-set-cell x (1- (+ y pong-bat-width)) pong-bat) | |
311 | (if (> y 1) | |
312 | (gamegrid-set-cell x (1- y) pong-blank)) | |
313 | (if (< (+ y pong-bat-width) (1- pong-height)) | |
314 | (gamegrid-set-cell x (+ y pong-bat-width) pong-blank))))) | |
a1506d29 | 315 | |
c1475eae GM |
316 | |
317 | ||
318 | (defun pong-init () | |
319 | "Initialize a game." | |
a1506d29 | 320 | |
c1475eae GM |
321 | (define-key pong-mode-map pong-pause-key 'pong-pause) |
322 | ||
c1475eae GM |
323 | (add-hook 'kill-buffer-hook 'pong-quit nil t) |
324 | ||
325 | ;; Initialization of some variables | |
326 | (setq pong-bat-player1 (1+ (/ (- pong-height pong-bat-width) 2))) | |
327 | (setq pong-bat-player2 pong-bat-player1) | |
328 | (setq pong-xx -1) | |
329 | (setq pong-yy 0) | |
330 | (setq pong-x (/ pong-width 2)) | |
331 | (setq pong-y (/ pong-height 2)) | |
332 | ||
333 | (pong-init-buffer) | |
334 | (gamegrid-kill-timer) | |
335 | (gamegrid-start-timer pong-timer-delay 'pong-update-game) | |
336 | (pong-update-score)) | |
337 | ||
338 | ||
339 | ||
340 | (defun pong-update-game (pong-buffer) | |
341 | "\"Main\" function for pong. | |
342 | It is called every pong-cycle-delay seconds and | |
343 | updates ball and bats positions. It is responsible of collision | |
344 | detection and checks if a player scores." | |
345 | (if (not (eq (current-buffer) pong-buffer)) | |
346 | (pong-pause) | |
a1506d29 | 347 | |
c1475eae GM |
348 | (let ((old-x pong-x) |
349 | (old-y pong-y)) | |
a1506d29 | 350 | |
c1475eae GM |
351 | (setq pong-x (+ pong-x pong-xx)) |
352 | (setq pong-y (+ pong-y pong-yy)) | |
a1506d29 | 353 | |
c1475eae GM |
354 | (if (and (> old-y 0) |
355 | (< old-y (- pong-height 1))) | |
356 | (gamegrid-set-cell old-x old-y pong-blank)) | |
a1506d29 | 357 | |
c1475eae GM |
358 | (if (and (> pong-y 0) |
359 | (< pong-y (- pong-height 1))) | |
360 | (gamegrid-set-cell pong-x pong-y pong-ball)) | |
a1506d29 | 361 | |
c1475eae GM |
362 | (cond |
363 | ((or (= pong-x 3) (= pong-x 2)) | |
a1506d29 | 364 | (if (and (>= pong-y pong-bat-player1) |
c1475eae | 365 | (< pong-y (+ pong-bat-player1 pong-bat-width))) |
a1506d29 | 366 | (and |
c1475eae | 367 | (setq pong-yy (+ pong-yy |
a1506d29 | 368 | (cond |
c1475eae GM |
369 | ((= pong-y pong-bat-player1) -1) |
370 | ((= pong-y (1+ pong-bat-player1)) 0) | |
371 | (t 1)))) | |
372 | (setq pong-xx (- pong-xx))))) | |
373 | ||
374 | ((or (= pong-x (- pong-width 4)) (= pong-x (- pong-width 3))) | |
a1506d29 | 375 | (if (and (>= pong-y pong-bat-player2) |
c1475eae | 376 | (< pong-y (+ pong-bat-player2 pong-bat-width))) |
a1506d29 | 377 | (and |
c1475eae | 378 | (setq pong-yy (+ pong-yy |
a1506d29 | 379 | (cond |
c1475eae GM |
380 | ((= pong-y pong-bat-player2) -1) |
381 | ((= pong-y (1+ pong-bat-player2)) 0) | |
382 | (t 1)))) | |
383 | (setq pong-xx (- pong-xx))))) | |
a1506d29 | 384 | |
c1475eae GM |
385 | ((<= pong-y 1) |
386 | (setq pong-yy (- pong-yy))) | |
387 | ||
388 | ((>= pong-y (- pong-height 2)) | |
389 | (setq pong-yy (- pong-yy))) | |
390 | ||
391 | ((< pong-x 1) | |
392 | (setq pong-score-player2 (1+ pong-score-player2)) | |
393 | (pong-init)) | |
394 | ||
395 | ((>= pong-x (- pong-width 1)) | |
396 | (setq pong-score-player1 (1+ pong-score-player1)) | |
397 | (pong-init)))))) | |
398 | ||
399 | ||
400 | ||
401 | (defun pong-update-score () | |
402 | "Update score and print it on bottom of the game grid." | |
403 | (let* ((string (format "Score: %d / %d" pong-score-player1 pong-score-player2)) | |
404 | (len (length string))) | |
405 | (loop for x from 0 to (1- len) do | |
406 | (if (string-equal (buffer-name (current-buffer)) pong-buffer-name) | |
407 | (gamegrid-set-cell x | |
408 | pong-height | |
409 | (aref string x)))))) | |
410 | ||
411 | ||
412 | ||
413 | (defun pong-pause () | |
414 | "Pause the game." | |
415 | (interactive) | |
416 | (gamegrid-kill-timer) | |
417 | ;; Oooohhh ugly. I don't know why, gamegrid-kill-timer don't do the | |
418 | ;; jobs it is made for. So I have to do it "by hand". Anyway, next | |
419 | ;; line is harmless. | |
420 | (cancel-function-timers 'pong-update-game) | |
421 | (define-key pong-mode-map pong-resume-key 'pong-resume)) | |
422 | ||
423 | ||
424 | ||
425 | (defun pong-resume () | |
426 | "Resume a paused game." | |
427 | (interactive) | |
428 | (define-key pong-mode-map pong-pause-key 'pong-pause) | |
429 | (gamegrid-start-timer pong-timer-delay 'pong-update-game)) | |
430 | ||
431 | ||
432 | ||
433 | (defun pong-quit () | |
434 | "Quit the game and kill the pong buffer." | |
435 | (interactive) | |
436 | (gamegrid-kill-timer) | |
437 | ;; Be sure not to draw things in another buffer and wait for some | |
438 | ;; time. | |
439 | (run-with-timer pong-timer-delay nil 'kill-buffer pong-buffer-name)) | |
440 | ||
441 | ||
442 | ||
443 | ;;;###autoload | |
444 | (defun pong () | |
445 | "Play pong and waste time. | |
446 | This is an implementation of the classical game pong. | |
447 | Move left and right bats and try to bounce the ball to your opponent. | |
448 | ||
e8951be0 | 449 | pong-mode keybindings:\\<pong-mode-map> |
c1475eae | 450 | |
e8951be0 | 451 | \\{pong-mode-map}" |
c1475eae GM |
452 | (interactive) |
453 | (setq pong-score-player1 0) | |
454 | (setq pong-score-player2 0) | |
455 | (pong-init)) | |
456 | ||
457 | ||
458 | ||
459 | (provide 'pong) | |
6e44da43 | 460 | |
cbee283d | 461 | ;; arch-tag: 1fdf0fc5-13e2-4de4-aae4-09bdd5af99f3 |
6e44da43 | 462 | ;;; pong.el ends here |