diff options
Diffstat (limited to 'lisp/play/pong.el')
| -rw-r--r-- | lisp/play/pong.el | 32 |
1 files changed, 16 insertions, 16 deletions
diff --git a/lisp/play/pong.el b/lisp/play/pong.el index 11aad3b6ea3..8d4f0871290 100644 --- a/lisp/play/pong.el +++ b/lisp/play/pong.el @@ -34,12 +34,12 @@ ;;; Customization -(defgroup pong nil +(defgroup pong nil "Emacs-Lisp implementation of the classical game pong." :tag "Pong" :group 'games) -(defcustom pong-buffer-name "*Pong*" +(defcustom pong-buffer-name "*Pong*" "*Name of the buffer used to play." :group 'pong :type '(string)) @@ -313,12 +313,12 @@ implementations you move with left/right paddle." (gamegrid-set-cell x (1- y) pong-blank)) (if (< (+ y pong-bat-width) (1- pong-height)) (gamegrid-set-cell x (+ y pong-bat-width) pong-blank))))) - + (defun pong-init () "Initialize a game." - + (define-key pong-mode-map pong-pause-key 'pong-pause) (add-hook 'kill-buffer-hook 'pong-quit nil t) @@ -345,44 +345,44 @@ updates ball and bats positions. It is responsible of collision detection and checks if a player scores." (if (not (eq (current-buffer) pong-buffer)) (pong-pause) - + (let ((old-x pong-x) (old-y pong-y)) - + (setq pong-x (+ pong-x pong-xx)) (setq pong-y (+ pong-y pong-yy)) - + (if (and (> old-y 0) (< old-y (- pong-height 1))) (gamegrid-set-cell old-x old-y pong-blank)) - + (if (and (> pong-y 0) (< pong-y (- pong-height 1))) (gamegrid-set-cell pong-x pong-y pong-ball)) - + (cond ((or (= pong-x 3) (= pong-x 2)) - (if (and (>= pong-y pong-bat-player1) + (if (and (>= pong-y pong-bat-player1) (< pong-y (+ pong-bat-player1 pong-bat-width))) - (and + (and (setq pong-yy (+ pong-yy - (cond + (cond ((= pong-y pong-bat-player1) -1) ((= pong-y (1+ pong-bat-player1)) 0) (t 1)))) (setq pong-xx (- pong-xx))))) ((or (= pong-x (- pong-width 4)) (= pong-x (- pong-width 3))) - (if (and (>= pong-y pong-bat-player2) + (if (and (>= pong-y pong-bat-player2) (< pong-y (+ pong-bat-player2 pong-bat-width))) - (and + (and (setq pong-yy (+ pong-yy - (cond + (cond ((= pong-y pong-bat-player2) -1) ((= pong-y (1+ pong-bat-player2)) 0) (t 1)))) (setq pong-xx (- pong-xx))))) - + ((<= pong-y 1) (setq pong-yy (- pong-yy))) |