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;;; chess-ics1.el --- Classic ICS1 style chessboard display
;; Copyright (C) 2002, 2005, 2014 Free Software Foundation, Inc.
;; Author: John Wiegley <johnw@gnu.org>
;; Keywords: games
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Code:
(require 'chess-display)
(defgroup chess-ics1 nil
"The ICS1 style ASCII display."
:group 'chess-display)
(defface chess-ics1-black-face
'((((class color) (background light)) (:foreground "Green"))
(((class color) (background dark)) (:foreground "Green"))
(t (:bold t)))
"*The face used for black pieces on the ASCII display."
:group 'chess-ics1)
(defface chess-ics1-white-face
'((((class color) (background light)) (:foreground "Yellow"))
(((class color) (background dark)) (:foreground "Yellow"))
(t (:bold t)))
"*The face used for white pieces on the ASCII display."
:group 'chess-ics1)
(defface chess-ics1-highlight-face
'((((class color) (background light)) (:background "#add8e6"))
(((class color) (background dark)) (:background "#add8e6")))
"Face to use for highlighting pieces that have been selected."
:group 'chess-ics1)
(defcustom chess-ics1-popup-function 'chess-ics1-popup
"The function used to popup a chess-ics1 display."
:type 'function
:group 'chess-ics1)
(defcustom chess-ics1-separate-frame nil
"If non-nil, display the chessboard in its own frame."
:type 'boolean
:group 'chess-ics1)
;;; Code:
(defun chess-ics1-handler (event &rest args)
(cond
((eq event 'initialize) t)
((eq event 'popup)
(funcall chess-ics1-popup-function))
((eq event 'draw)
(apply 'chess-ics1-draw args))
((eq event 'draw-square)
(apply 'chess-ics1-draw-square args))
((eq event 'highlight)
(apply 'chess-ics1-highlight args))))
(defun chess-ics1-popup ()
(if chess-ics1-separate-frame
(chess-display-popup-in-frame 21 43 nil nil t)
(chess-display-popup-in-window)))
(defsubst chess-ics1-piece-text (piece)
(let ((p (char-to-string piece)))
(add-text-properties 0 1 (list 'face (if (> piece ?a)
'chess-ics1-black-face
'chess-ics1-white-face)) p)
p))
(defsubst chess-ics1-draw-square (pos piece index)
"Draw a piece image at point on an already drawn display."
(save-excursion
(let ((inhibit-redisplay t))
(goto-char pos)
(delete-char 3)
(insert ? (chess-ics1-piece-text piece) ? )
(add-text-properties pos (point) (list 'chess-coord index)))))
(defun chess-ics1-draw (position perspective)
"Draw the given POSITION from PERSPECTIVE's point of view.
PERSPECTIVE is t for white or nil for black."
(let ((inhibit-redisplay t)
(pos (point)))
(erase-buffer)
(let* ((inverted (not perspective))
(rank (if inverted 7 0))
(file (if inverted 7 0)))
(insert "\n +---+---+---+---+---+---+---+---+\n")
(while (if inverted (>= rank 0) (< rank 8))
(if (/= rank (if inverted 7 0))
(insert " +---+---+---+---+---+---+---+---+\n"))
(while (if inverted (>= file 0) (< file 8))
(let ((piece (chess-pos-piece position
(chess-rf-to-index rank file)))
begin)
(if (= file (if inverted 7 0))
(insert (format " %d " (1+ (- 7 rank)))))
(insert "| ")
(setq begin (1- (point)))
(insert (chess-ics1-piece-text piece) ? )
(add-text-properties begin (point)
(list 'chess-coord
(chess-rf-to-index rank file))))
(setq file (if inverted (1- file) (1+ file))))
(insert "|\n")
(setq file (if inverted 7 0)
rank (if inverted (1- rank) (1+ rank))))
(insert " +---+---+---+---+---+---+---+---+\n")
(if inverted
(insert " h g f e d c b a\n\n")
(insert " a b c d e f g h\n\n")))
(set-buffer-modified-p nil)
(goto-char pos)))
(defun chess-ics1-highlight (index &optional mode)
(let ((pos (chess-display-index-pos nil index)))
(put-text-property pos (save-excursion
(goto-char pos)
(skip-chars-forward "^|")
(point))
'face (cond
((eq mode :selected)
'chess-ics1-highlight-face)
(t
(chess-display-get-face mode))))))
(defun chess-debug-position (&optional position)
"This is a debugging function, and not meant from general use."
(interactive)
(let ((pos (or position (chess-engine-position nil))))
(with-current-buffer (get-buffer-create "*scratch*")
(chess-ics1-draw pos t)
(funcall chess-ics1-popup-function))))
(provide 'chess-ics1)
;;; chess-ics1.el ends here
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