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; Blackbox game in Emacs Lisp
; by F. Thomas May
; uw-nsr!uw-warp!tom@beaver.cs.washington.edu
(defvar blackbox-mode-map nil "")
(if blackbox-mode-map
()
(setq blackbox-mode-map (make-keymap))
(suppress-keymap blackbox-mode-map t)
(define-key blackbox-mode-map "\C-f" 'bb-right)
(define-key blackbox-mode-map "\C-b" 'bb-left)
(define-key blackbox-mode-map "\C-p" 'bb-up)
(define-key blackbox-mode-map "\C-n" 'bb-down)
(define-key blackbox-mode-map "\C-e" 'bb-eol)
(define-key blackbox-mode-map "\C-a" 'bb-bol)
(define-key blackbox-mode-map " " 'bb-romp)
(define-key blackbox-mode-map "\C-m" 'bb-done))
;; Blackbox mode is suitable only for specially formatted data.
(put 'blackbox-mode 'mode-class 'special)
(defun blackbox-mode ()
"Major mode for playing blackbox.
SPC -- send in a ray from point, or toggle a ball
RET -- end game and get score
Precisely,\\{blackbox-mode-map}"
(interactive)
(kill-all-local-variables)
(use-local-map blackbox-mode-map)
(setq truncate-lines t)
(setq major-mode 'blackbox-mode)
(setq mode-name "Blackbox"))
(defun blackbox (num)
"Play blackbox. Arg is number of balls."
(interactive "P")
(switch-to-buffer "*Blackbox*")
(blackbox-mode)
(setq buffer-read-only t)
(buffer-flush-undo (current-buffer))
(setq bb-board (bb-init-board (or num 4)))
(setq bb-balls-placed nil)
(setq bb-x -1)
(setq bb-y -1)
(setq bb-score 0)
(setq bb-detour-count 0)
(bb-insert-board)
(bb-goto (cons bb-x bb-y)))
(defun bb-init-board (num-balls)
(random t)
(let (board pos)
(while (>= (setq num-balls (1- num-balls)) 0)
(while
(progn
(setq pos (cons (logand (random) 7) (logand (random) 7)))
(bb-member pos board)))
(setq board (cons pos board)))
board))
(defun bb-insert-board ()
(let (i (buffer-read-only nil))
(erase-buffer)
(insert " \n")
(setq i 8)
(while (>= (setq i (1- i)) 0)
(insert " - - - - - - - - \n"))
(insert " \n")))
(defun bb-right ()
(interactive)
(if (= bb-x 8)
()
(forward-char 2)
(setq bb-x (1+ bb-x))))
(defun bb-left ()
(interactive)
(if (= bb-x -1)
()
(backward-char 2)
(setq bb-x (1- bb-x))))
(defun bb-up ()
(interactive)
(if (= bb-y -1)
()
(previous-line 1)
(setq bb-y (1- bb-y))))
(defun bb-down ()
(interactive)
(if (= bb-y 8)
()
(next-line 1)
(setq bb-y (1+ bb-y))))
(defun bb-eol ()
(interactive)
(setq bb-x 8)
(bb-goto (cons bb-x bb-y)))
(defun bb-bol ()
(interactive)
(setq bb-x -1)
(bb-goto (cons bb-x bb-y)))
(defun bb-romp ()
(interactive)
(cond
((and
(or (= bb-x -1) (= bb-x 8))
(or (= bb-y -1) (= bb-y 8))))
((bb-outside-box bb-x bb-y)
(bb-trace-ray bb-x bb-y))
(t
(bb-place-ball bb-x bb-y))))
(defun bb-place-ball (x y)
(let ((coord (cons x y)))
(cond
((bb-member coord bb-balls-placed)
(setq bb-balls-placed (bb-delete coord bb-balls-placed))
(bb-update-board "-"))
(t
(setq bb-balls-placed (cons coord bb-balls-placed))
(bb-update-board "O")))))
(defun bb-trace-ray (x y)
(let ((result (bb-trace-ray-2
t
x
(cond
((= x -1) 1)
((= x 8) -1)
(t 0))
y
(cond
((= y -1) 1)
((= y 8) -1)
(t 0)))))
(cond
((eq result 'hit)
(bb-update-board "H")
(setq bb-score (1+ bb-score)))
((equal result (cons x y))
(bb-update-board "R")
(setq bb-score (1+ bb-score)))
(t
(setq bb-detour-count (1+ bb-detour-count))
(bb-update-board (format "%d" bb-detour-count))
(save-excursion
(bb-goto result)
(bb-update-board (format "%d" bb-detour-count)))
(setq bb-score (+ bb-score 2))))))
(defun bb-trace-ray-2 (first x dx y dy)
(cond
((and (not first)
(bb-outside-box x y))
(cons x y))
((bb-member (cons (+ x dx) (+ y dy)) bb-board)
'hit)
((bb-member (cons (+ x dx dy) (+ y dy dx)) bb-board)
(bb-trace-ray-2 nil x (- dy) y (- dx)))
((bb-member (cons (+ x dx (- dy)) (+ y dy (- dx))) bb-board)
(bb-trace-ray-2 nil x dy y dx))
(t
(bb-trace-ray-2 nil (+ x dx) dx (+ y dy) dy))))
(defun bb-done ()
(interactive)
(let (bogus-balls)
(if (not (= (length bb-balls-placed) (length bb-board)))
(message "Spud! You have only %d balls in the box."
(length bb-balls-placed))
(setq bogus-balls (bb-show-bogus-balls bb-balls-placed bb-board))
(if (= bogus-balls 0)
(message "Right! Your score is %d." bb-score)
(setq bb-score (+ bb-score (* 5 bogus-balls)))
(message "Veg! You missed %d balls. Your score is %d."
bogus-balls bb-score))
(bb-goto '(-1 . -1)))))
(defun bb-show-bogus-balls (balls-placed board)
(bb-show-bogus-balls-2 balls-placed board "x")
(bb-show-bogus-balls-2 board balls-placed "o"))
(defun bb-show-bogus-balls-2 (list-1 list-2 c)
(cond
((null list-1)
0)
((bb-member (car list-1) list-2)
(bb-show-bogus-balls-2 (cdr list-1) list-2 c))
(t
(bb-goto (car list-1))
(bb-update-board c)
(1+ (bb-show-bogus-balls-2 (cdr list-1) list-2 c)))))
(defun bb-outside-box (x y)
(or (= x -1) (= x 8) (= y -1) (= y 8)))
(defun bb-goto (pos)
(goto-char (+ (* (car pos) 2) (* (cdr pos) 22) 26)))
(defun bb-update-board (c)
(let ((buffer-read-only nil))
(backward-char (1- (length c)))
(delete-char (length c))
(insert c)
(backward-char 1)))
(defun bb-member (elt list)
"Returns non-nil if ELT is an element of LIST. Comparison done with equal."
(eval (cons 'or (mapcar (function (lambda (x) (equal x elt))) list))))
(defun bb-delete (item list)
"Deletes ITEM from LIST and returns a copy."
(cond
((equal item (car list)) (cdr list))
(t (cons (car list) (bb-delete item (cdr list))))))
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