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c1475eae GM |
1 | ;;; pong.el - classical implementation of pong |
2 | ||
3 | ;; Copyright 1999, 2000 by Free Software Foundation, Inc. | |
4 | ||
9a742968 | 5 | ;; Author: Benjamin Drieu <drieu@bocal.cs.univ-paris8.fr> |
c1475eae GM |
6 | ;; Keywords: games |
7 | ||
8 | ;; This file is part of GNU Emacs. | |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
12 | ;; the Free Software Foundation; either version 2, or (at your option) | |
13 | ;; any later version. | |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
22 | ;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | ;; Boston, MA 02111-1307, USA. | |
24 | ||
25 | ;;; Commentary: | |
26 | ||
27 | ;; This is an implementation of the classical game pong. | |
28 | ||
29 | ;;; Code: | |
30 | ||
31 | (eval-when-compile (require 'cl)) | |
32 | ||
33 | (require 'gamegrid) | |
34 | ||
35 | ;;; Customization | |
36 | ||
37 | (defgroup pong nil | |
38 | "Emacs-Lisp implementation of the classical game pong." | |
39 | :tag "Pong" | |
40 | :group 'games) | |
41 | ||
42 | (defcustom pong-buffer-name "*Pong*" | |
43 | "*Name of the buffer used to play." | |
44 | :group 'pong | |
45 | :type '(string)) | |
46 | ||
47 | (defcustom pong-width 50 | |
48 | "*Width of the playfield." | |
49 | :group 'pong | |
50 | :type '(integer)) | |
51 | ||
52 | (defcustom pong-height 30 | |
53 | "*Height of the playfield." | |
54 | :group 'pong | |
55 | :type '(integer)) | |
56 | ||
57 | (defcustom pong-bat-width 3 | |
58 | "*Width of the bats for pong." | |
59 | :group 'pong | |
60 | :type '(integer)) | |
61 | ||
62 | (defcustom pong-blank-color "black" | |
63 | "*Color used for background." | |
64 | :group 'pong | |
65 | :type '(string)) | |
66 | ||
67 | (defcustom pong-bat-color "yellow" | |
68 | "*Color used for bats." | |
69 | :group 'pong | |
70 | :type '(string)) | |
71 | ||
72 | (defcustom pong-ball-color "red" | |
73 | "*Color used for the ball." | |
74 | :group 'pong | |
75 | :type '(string)) | |
76 | ||
77 | (defcustom pong-border-color "white" | |
78 | "*Color used for pong balls." | |
79 | :group 'pong | |
80 | :type '(string)) | |
81 | ||
82 | (defcustom pong-left-key "4" | |
83 | "*Alternate key to press for bat 1 to go up (primary one is [left])." | |
84 | :group 'pong | |
85 | :type '(vector)) | |
86 | ||
87 | (defcustom pong-right-key "6" | |
88 | "*Alternate key to press for bat 1 to go down (primary one is [right])." | |
89 | :group 'pong | |
90 | :type '(vector)) | |
91 | ||
92 | (defcustom pong-up-key "8" | |
93 | "*Alternate key to press for bat 2 to go up (primary one is [up])." | |
94 | :group 'pong | |
95 | :type '(vector)) | |
96 | ||
97 | (defcustom pong-down-key "2" | |
98 | "*Alternate key to press for bat 2 to go down (primary one is [down])." | |
99 | :group 'pong | |
100 | :type '(vector)) | |
101 | ||
102 | (defcustom pong-quit-key "q" | |
103 | "*Key to press to quit pong." | |
104 | :group 'pong | |
105 | :type '(vector)) | |
106 | ||
107 | (defcustom pong-pause-key "p" | |
108 | "Key to press to pause pong." | |
109 | :group 'pong | |
110 | :type '(vector)) | |
111 | ||
112 | (defcustom pong-resume-key "p" | |
113 | "*Key to press to resume pong." | |
114 | :group 'pong | |
115 | :type '(vector)) | |
116 | ||
117 | (defcustom pong-timer-delay 0.1 | |
118 | "*Time to wait between every cycle." | |
119 | :group 'pong | |
120 | :type '(integer)) | |
121 | ||
122 | ||
123 | ;;; This is black magic. Define colors used | |
124 | ||
125 | (defvar pong-blank-options | |
126 | '(((glyph colorize) | |
127 | (t ?\040)) | |
128 | ((color-x color-x) | |
129 | (mono-x grid-x) | |
130 | (color-tty color-tty)) | |
131 | (((glyph color-x) [0 0 0]) | |
132 | (color-tty pong-blank-color)))) | |
133 | ||
134 | (defvar pong-bat-options | |
135 | '(((glyph colorize) | |
136 | (emacs-tty ?O) | |
137 | (t ?\040)) | |
138 | ((color-x color-x) | |
139 | (mono-x mono-x) | |
140 | (color-tty color-tty) | |
141 | (mono-tty mono-tty)) | |
142 | (((glyph color-x) [1 1 0]) | |
143 | (color-tty pong-bat-color)))) | |
144 | ||
145 | (defvar pong-ball-options | |
146 | '(((glyph colorize) | |
147 | (t ?\*)) | |
148 | ((color-x color-x) | |
149 | (mono-x grid-x) | |
150 | (color-tty color-tty)) | |
151 | (((glyph color-x) [1 0 0]) | |
152 | (color-tty pong-ball-color)))) | |
153 | ||
154 | (defvar pong-border-options | |
155 | '(((glyph colorize) | |
156 | (t ?\+)) | |
157 | ((color-x color-x) | |
158 | (mono-x grid-x)) | |
159 | (((glyph color-x) [0.5 0.5 0.5]) | |
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) | |
245 | 1) | |
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))))) | |
315 | ||
316 | ||
317 | ||
318 | (defun pong-init () | |
319 | "Initialize a game." | |
320 | ||
321 | (define-key pong-mode-map pong-pause-key 'pong-pause) | |
322 | ||
323 | (make-local-hook 'kill-buffer-hook) | |
324 | (add-hook 'kill-buffer-hook 'pong-quit nil t) | |
325 | ||
326 | ;; Initialization of some variables | |
327 | (setq pong-bat-player1 (1+ (/ (- pong-height pong-bat-width) 2))) | |
328 | (setq pong-bat-player2 pong-bat-player1) | |
329 | (setq pong-xx -1) | |
330 | (setq pong-yy 0) | |
331 | (setq pong-x (/ pong-width 2)) | |
332 | (setq pong-y (/ pong-height 2)) | |
333 | ||
334 | (pong-init-buffer) | |
335 | (gamegrid-kill-timer) | |
336 | (gamegrid-start-timer pong-timer-delay 'pong-update-game) | |
337 | (pong-update-score)) | |
338 | ||
339 | ||
340 | ||
341 | (defun pong-update-game (pong-buffer) | |
342 | "\"Main\" function for pong. | |
343 | It is called every pong-cycle-delay seconds and | |
344 | updates ball and bats positions. It is responsible of collision | |
345 | detection and checks if a player scores." | |
346 | (if (not (eq (current-buffer) pong-buffer)) | |
347 | (pong-pause) | |
348 | ||
349 | (let ((old-x pong-x) | |
350 | (old-y pong-y)) | |
351 | ||
352 | (setq pong-x (+ pong-x pong-xx)) | |
353 | (setq pong-y (+ pong-y pong-yy)) | |
354 | ||
355 | (if (and (> old-y 0) | |
356 | (< old-y (- pong-height 1))) | |
357 | (gamegrid-set-cell old-x old-y pong-blank)) | |
358 | ||
359 | (if (and (> pong-y 0) | |
360 | (< pong-y (- pong-height 1))) | |
361 | (gamegrid-set-cell pong-x pong-y pong-ball)) | |
362 | ||
363 | (cond | |
364 | ((or (= pong-x 3) (= pong-x 2)) | |
365 | (if (and (>= pong-y pong-bat-player1) | |
366 | (< pong-y (+ pong-bat-player1 pong-bat-width))) | |
367 | (and | |
368 | (setq pong-yy (+ pong-yy | |
369 | (cond | |
370 | ((= pong-y pong-bat-player1) -1) | |
371 | ((= pong-y (1+ pong-bat-player1)) 0) | |
372 | (t 1)))) | |
373 | (setq pong-xx (- pong-xx))))) | |
374 | ||
375 | ((or (= pong-x (- pong-width 4)) (= pong-x (- pong-width 3))) | |
376 | (if (and (>= pong-y pong-bat-player2) | |
377 | (< pong-y (+ pong-bat-player2 pong-bat-width))) | |
378 | (and | |
379 | (setq pong-yy (+ pong-yy | |
380 | (cond | |
381 | ((= pong-y pong-bat-player2) -1) | |
382 | ((= pong-y (1+ pong-bat-player2)) 0) | |
383 | (t 1)))) | |
384 | (setq pong-xx (- pong-xx))))) | |
385 | ||
386 | ((<= pong-y 1) | |
387 | (setq pong-yy (- pong-yy))) | |
388 | ||
389 | ((>= pong-y (- pong-height 2)) | |
390 | (setq pong-yy (- pong-yy))) | |
391 | ||
392 | ((< pong-x 1) | |
393 | (setq pong-score-player2 (1+ pong-score-player2)) | |
394 | (pong-init)) | |
395 | ||
396 | ((>= pong-x (- pong-width 1)) | |
397 | (setq pong-score-player1 (1+ pong-score-player1)) | |
398 | (pong-init)))))) | |
399 | ||
400 | ||
401 | ||
402 | (defun pong-update-score () | |
403 | "Update score and print it on bottom of the game grid." | |
404 | (let* ((string (format "Score: %d / %d" pong-score-player1 pong-score-player2)) | |
405 | (len (length string))) | |
406 | (loop for x from 0 to (1- len) do | |
407 | (if (string-equal (buffer-name (current-buffer)) pong-buffer-name) | |
408 | (gamegrid-set-cell x | |
409 | pong-height | |
410 | (aref string x)))))) | |
411 | ||
412 | ||
413 | ||
414 | (defun pong-pause () | |
415 | "Pause the game." | |
416 | (interactive) | |
417 | (gamegrid-kill-timer) | |
418 | ;; Oooohhh ugly. I don't know why, gamegrid-kill-timer don't do the | |
419 | ;; jobs it is made for. So I have to do it "by hand". Anyway, next | |
420 | ;; line is harmless. | |
421 | (cancel-function-timers 'pong-update-game) | |
422 | (define-key pong-mode-map pong-resume-key 'pong-resume)) | |
423 | ||
424 | ||
425 | ||
426 | (defun pong-resume () | |
427 | "Resume a paused game." | |
428 | (interactive) | |
429 | (define-key pong-mode-map pong-pause-key 'pong-pause) | |
430 | (gamegrid-start-timer pong-timer-delay 'pong-update-game)) | |
431 | ||
432 | ||
433 | ||
434 | (defun pong-quit () | |
435 | "Quit the game and kill the pong buffer." | |
436 | (interactive) | |
437 | (gamegrid-kill-timer) | |
438 | ;; Be sure not to draw things in another buffer and wait for some | |
439 | ;; time. | |
440 | (run-with-timer pong-timer-delay nil 'kill-buffer pong-buffer-name)) | |
441 | ||
442 | ||
443 | ||
444 | ;;;###autoload | |
445 | (defun pong () | |
446 | "Play pong and waste time. | |
447 | This is an implementation of the classical game pong. | |
448 | Move left and right bats and try to bounce the ball to your opponent. | |
449 | ||
450 | pong-mode keybindings: | |
451 | \\<pong-mode-map> | |
452 | ||
453 | \\{pong-mode-map}" | |
454 | (interactive) | |
455 | (setq pong-score-player1 0) | |
456 | (setq pong-score-player2 0) | |
457 | (pong-init)) | |
458 | ||
459 | ||
460 | ||
461 | (provide 'pong) |