Commit | Line | Data |
---|---|---|
5f72adc0 | 1 | ;;; pong.el --- classical implementation of pong |
c1475eae | 2 | |
ab422c4d | 3 | ;; Copyright (C) 1999-2013 Free Software Foundation, Inc. |
c1475eae | 4 | |
9781053a | 5 | ;; Author: Benjamin Drieu <bdrieu@april.org> |
c1475eae GM |
6 | ;; Keywords: games |
7 | ||
8 | ;; This file is part of GNU Emacs. | |
9 | ||
b1fc2b50 | 10 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
c1475eae | 11 | ;; it under the terms of the GNU General Public License as published by |
b1fc2b50 GM |
12 | ;; the Free Software Foundation, either version 3 of the License, or |
13 | ;; (at your option) any later version. | |
c1475eae GM |
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 | |
b1fc2b50 | 21 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
c1475eae GM |
22 | |
23 | ;;; Commentary: | |
24 | ||
25 | ;; This is an implementation of the classical game pong. | |
26 | ||
27 | ;;; Code: | |
28 | ||
a464a6c7 | 29 | (eval-when-compile (require 'cl-lib)) |
c1475eae GM |
30 | |
31 | (require 'gamegrid) | |
32 | ||
33 | ;;; Customization | |
34 | ||
a1506d29 | 35 | (defgroup pong nil |
c1475eae GM |
36 | "Emacs-Lisp implementation of the classical game pong." |
37 | :tag "Pong" | |
38 | :group 'games) | |
39 | ||
a1506d29 | 40 | (defcustom pong-buffer-name "*Pong*" |
67d110f1 | 41 | "Name of the buffer used to play." |
c1475eae GM |
42 | :group 'pong |
43 | :type '(string)) | |
44 | ||
45 | (defcustom pong-width 50 | |
67d110f1 | 46 | "Width of the playfield." |
c1475eae GM |
47 | :group 'pong |
48 | :type '(integer)) | |
49 | ||
e029dcaf | 50 | (defcustom pong-height (min 30 (- (frame-height) 6)) |
67d110f1 | 51 | "Height of the playfield." |
c1475eae GM |
52 | :group 'pong |
53 | :type '(integer)) | |
54 | ||
55 | (defcustom pong-bat-width 3 | |
67d110f1 | 56 | "Width of the bats for pong." |
c1475eae GM |
57 | :group 'pong |
58 | :type '(integer)) | |
59 | ||
60 | (defcustom pong-blank-color "black" | |
67d110f1 | 61 | "Color used for background." |
c1475eae | 62 | :group 'pong |
a430ca88 | 63 | :type 'color) |
c1475eae GM |
64 | |
65 | (defcustom pong-bat-color "yellow" | |
67d110f1 | 66 | "Color used for bats." |
c1475eae | 67 | :group 'pong |
a430ca88 | 68 | :type 'color) |
c1475eae GM |
69 | |
70 | (defcustom pong-ball-color "red" | |
67d110f1 | 71 | "Color used for the ball." |
c1475eae | 72 | :group 'pong |
a430ca88 | 73 | :type 'color) |
c1475eae GM |
74 | |
75 | (defcustom pong-border-color "white" | |
67d110f1 | 76 | "Color used for pong borders." |
c1475eae | 77 | :group 'pong |
a430ca88 | 78 | :type 'color) |
c1475eae GM |
79 | |
80 | (defcustom pong-left-key "4" | |
67d110f1 | 81 | "Alternate key to press for bat 1 to go up (primary one is [left])." |
c1475eae | 82 | :group 'pong |
a430ca88 | 83 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
84 | |
85 | (defcustom pong-right-key "6" | |
67d110f1 | 86 | "Alternate key to press for bat 1 to go down (primary one is [right])." |
c1475eae | 87 | :group 'pong |
a430ca88 | 88 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
89 | |
90 | (defcustom pong-up-key "8" | |
67d110f1 | 91 | "Alternate key to press for bat 2 to go up (primary one is [up])." |
c1475eae | 92 | :group 'pong |
a430ca88 | 93 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
94 | |
95 | (defcustom pong-down-key "2" | |
67d110f1 | 96 | "Alternate key to press for bat 2 to go down (primary one is [down])." |
c1475eae | 97 | :group 'pong |
a430ca88 | 98 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
99 | |
100 | (defcustom pong-quit-key "q" | |
67d110f1 | 101 | "Key to press to quit pong." |
c1475eae | 102 | :group 'pong |
a430ca88 | 103 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
104 | |
105 | (defcustom pong-pause-key "p" | |
106 | "Key to press to pause pong." | |
107 | :group 'pong | |
a430ca88 | 108 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
109 | |
110 | (defcustom pong-resume-key "p" | |
67d110f1 | 111 | "Key to press to resume pong." |
c1475eae | 112 | :group 'pong |
a430ca88 | 113 | :type '(restricted-sexp :match-alternatives (stringp vectorp))) |
c1475eae GM |
114 | |
115 | (defcustom pong-timer-delay 0.1 | |
67d110f1 | 116 | "Time to wait between every cycle." |
c1475eae | 117 | :group 'pong |
a430ca88 | 118 | :type 'number) |
c1475eae GM |
119 | |
120 | ||
121 | ;;; This is black magic. Define colors used | |
122 | ||
123 | (defvar pong-blank-options | |
124 | '(((glyph colorize) | |
125 | (t ?\040)) | |
126 | ((color-x color-x) | |
127 | (mono-x grid-x) | |
128 | (color-tty color-tty)) | |
129 | (((glyph color-x) [0 0 0]) | |
130 | (color-tty pong-blank-color)))) | |
131 | ||
132 | (defvar pong-bat-options | |
133 | '(((glyph colorize) | |
134 | (emacs-tty ?O) | |
135 | (t ?\040)) | |
136 | ((color-x color-x) | |
137 | (mono-x mono-x) | |
138 | (color-tty color-tty) | |
139 | (mono-tty mono-tty)) | |
140 | (((glyph color-x) [1 1 0]) | |
141 | (color-tty pong-bat-color)))) | |
142 | ||
143 | (defvar pong-ball-options | |
144 | '(((glyph colorize) | |
145 | (t ?\*)) | |
146 | ((color-x color-x) | |
147 | (mono-x grid-x) | |
148 | (color-tty color-tty)) | |
149 | (((glyph color-x) [1 0 0]) | |
150 | (color-tty pong-ball-color)))) | |
151 | ||
152 | (defvar pong-border-options | |
153 | '(((glyph colorize) | |
154 | (t ?\+)) | |
155 | ((color-x color-x) | |
6add7517 FP |
156 | (mono-x grid-x) |
157 | (color-tty color-tty)) | |
158 | (((glyph color-x) [0.5 0.5 0.5]) | |
c1475eae GM |
159 | (color-tty pong-border-color)))) |
160 | ||
161 | (defconst pong-blank 0) | |
162 | (defconst pong-bat 1) | |
163 | (defconst pong-ball 2) | |
164 | (defconst pong-border 3) | |
165 | ||
166 | ||
167 | ;;; Determine initial positions for bats and ball | |
168 | ||
169 | (defvar pong-xx nil | |
170 | "Horizontal speed of the ball.") | |
171 | ||
172 | (defvar pong-yy nil | |
173 | "Vertical speed of the ball.") | |
174 | ||
175 | (defvar pong-x nil | |
176 | "Horizontal position of the ball.") | |
177 | ||
178 | (defvar pong-y nil | |
179 | "Vertical position of the ball.") | |
180 | ||
181 | (defvar pong-bat-player1 nil | |
182 | "Vertical position of bat 1.") | |
183 | ||
184 | (defvar pong-bat-player2 nil | |
185 | "Vertical position of bat 2.") | |
186 | ||
187 | (defvar pong-score-player1 nil) | |
188 | (defvar pong-score-player2 nil) | |
189 | ||
190 | ;;; Initialize maps | |
191 | ||
192 | (defvar pong-mode-map | |
b016851c SM |
193 | (let ((map (make-sparse-keymap 'pong-mode-map))) |
194 | (define-key map [left] 'pong-move-left) | |
195 | (define-key map [right] 'pong-move-right) | |
196 | (define-key map [up] 'pong-move-up) | |
197 | (define-key map [down] 'pong-move-down) | |
198 | (define-key map pong-left-key 'pong-move-left) | |
199 | (define-key map pong-right-key 'pong-move-right) | |
200 | (define-key map pong-up-key 'pong-move-up) | |
201 | (define-key map pong-down-key 'pong-move-down) | |
202 | (define-key map pong-quit-key 'pong-quit) | |
203 | (define-key map pong-pause-key 'pong-pause) | |
204 | map) | |
205 | "Modemap for pong-mode.") | |
c1475eae GM |
206 | |
207 | (defvar pong-null-map | |
208 | (make-sparse-keymap 'pong-null-map) "Null map for pong-mode.") | |
209 | ||
c1475eae GM |
210 | |
211 | ||
212 | ;;; Fun stuff -- The code | |
213 | ||
214 | (defun pong-display-options () | |
215 | "Computes display options (required by gamegrid for colors)." | |
216 | (let ((options (make-vector 256 nil))) | |
a464a6c7 | 217 | (dotimes (c 256) |
c1475eae | 218 | (aset options c |
a464a6c7 SM |
219 | (cond ((= c pong-blank) |
220 | pong-blank-options) | |
c1475eae | 221 | ((= c pong-bat) |
a464a6c7 | 222 | pong-bat-options) |
c1475eae | 223 | ((= c pong-ball) |
a464a6c7 | 224 | pong-ball-options) |
c1475eae | 225 | ((= c pong-border) |
a464a6c7 | 226 | pong-border-options) |
c1475eae | 227 | (t |
a464a6c7 | 228 | '(nil nil nil))))) |
c1475eae GM |
229 | options)) |
230 | ||
231 | ||
232 | ||
233 | (defun pong-init-buffer () | |
234 | "Initialize pong buffer and draw stuff thanks to gamegrid library." | |
235 | (interactive) | |
236 | (get-buffer-create pong-buffer-name) | |
237 | (switch-to-buffer pong-buffer-name) | |
238 | (use-local-map pong-mode-map) | |
239 | ||
240 | (setq gamegrid-use-glyphs t) | |
241 | (setq gamegrid-use-color t) | |
242 | (gamegrid-init (pong-display-options)) | |
243 | ||
244 | (gamegrid-init-buffer pong-width | |
245 | (+ 2 pong-height) | |
f47adf18 | 246 | ?\s) |
c1475eae GM |
247 | |
248 | (let ((buffer-read-only nil)) | |
a464a6c7 SM |
249 | (dotimes (y pong-height) |
250 | (dotimes (x pong-width) | |
251 | (gamegrid-set-cell x y pong-border))) | |
252 | (cl-loop for y from 1 to (- pong-height 2) do | |
253 | (cl-loop for x from 1 to (- pong-width 2) do | |
254 | (gamegrid-set-cell x y pong-blank)))) | |
c1475eae | 255 | |
a464a6c7 SM |
256 | (cl-loop for y from pong-bat-player1 |
257 | to (1- (+ pong-bat-player1 pong-bat-width)) | |
258 | do (gamegrid-set-cell 2 y pong-bat)) | |
259 | (cl-loop for y from pong-bat-player2 | |
260 | to (1- (+ pong-bat-player2 pong-bat-width)) | |
261 | do (gamegrid-set-cell (- pong-width 3) y pong-bat))) | |
c1475eae GM |
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." | |
a464a6c7 SM |
405 | (let* ((string (format "Score: %d / %d" |
406 | pong-score-player1 pong-score-player2)) | |
c1475eae | 407 | (len (length string))) |
a464a6c7 SM |
408 | (dotimes (x len) |
409 | (if (string-equal (buffer-name (current-buffer)) pong-buffer-name) | |
410 | (gamegrid-set-cell x pong-height (aref string x)))))) | |
c1475eae GM |
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 | ||
e8951be0 | 450 | pong-mode keybindings:\\<pong-mode-map> |
c1475eae | 451 | |
e8951be0 | 452 | \\{pong-mode-map}" |
c1475eae GM |
453 | (interactive) |
454 | (setq pong-score-player1 0) | |
455 | (setq pong-score-player2 0) | |
456 | (pong-init)) | |
457 | ||
458 | ||
459 | ||
460 | (provide 'pong) | |
6e44da43 PJ |
461 | |
462 | ;;; pong.el ends here |