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From: Thien-Thi Nguyen
Subject: colorcomp.el
Date: Sat, 20 May 2006 10:40:13 +0200

greetings earthlings,

please find below colorcomp.el, a simple exercise to use ewoc.el
(specifically, the one in cvs emacs).  munge to taste, etc.

it may be used w/ ewoc.el in the wild, but you will probably see
extra (though harmless) blank lines.


;;; colorcomp.el --- Manipulate color components interactively

;; Copyright (C) 2006 Thien-Thi Nguyen

;; 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 2, 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
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:

;; Load it and try: M-x colorcomp RET forest green RET
;; Seems to work ok for my setup (256 colors under X).

;;; Code:

(require 'ewoc)

;; vars

(defvar colorcomp-ewoc nil)
(defvar colorcomp-data nil)

(defvar colorcomp-labels ["Red" "Green" "Blue"])

(defvar colorcomp-mode-map nil)

;; funcs

(defun colorcomp-pp (data)
  (if data
      (let ((comp (aref colorcomp-data data)))
        (insert (aref colorcomp-labels data) "\t: #x"
                (format "%02X" comp) " "
                (make-string (ash comp -2) ?#) "\n"))
    (let ((cstr (format "#%02X%02X%02X"
                        (aref colorcomp-data 0)
                        (aref colorcomp-data 1)
                        (aref colorcomp-data 2)))
          (samp " (sample text) "))
      (insert "Color\t: "
              (propertize samp 'face `(foreground-color . ,cstr))
              (propertize samp 'face `(background-color . ,cstr))

(defun colorcomp (color)
  "Allow fiddling with COLOR in a new buffer.
The buffer is in Color Components mode."
  (interactive "sColor (name or #RGB or #RRGGBB): ")
  (when (string= "" color)
    (setq color "green"))
  (unless (color-values color)
    (error "No such color: %S" color))
   (generate-new-buffer (format "originally: %s" color)))
  (setq major-mode 'colorcomp-mode
        mode-name "Color-Components")
  (use-local-map colorcomp-mode-map)
  (let ((data (apply 'vector (mapcar (lambda (n) (ash n -8))
                                     (color-values color))))
        (ewoc (ewoc-create 'colorcomp-pp
                           "\nColor Components\n\n"
    (set (make-local-variable 'colorcomp-data) data)
    (set (make-local-variable 'colorcomp-ewoc) ewoc)
    (ewoc-enter-last ewoc 0)
    (ewoc-enter-last ewoc 1)
    (ewoc-enter-last ewoc 2)
    (ewoc-enter-last ewoc nil)))

(defun colorcomp-mod (index limit delta)
    (let ((cur (aref colorcomp-data index))
          (ewoc colorcomp-ewoc))
      (unless (= limit cur)
        (aset colorcomp-data index (+ cur delta)))
       (ewoc-nth ewoc index)
       (ewoc-nth ewoc -1)))))

(defun colorcomp-R-more () (interactive) (colorcomp-mod 0 255 1))
(defun colorcomp-G-more () (interactive) (colorcomp-mod 1 255 1))
(defun colorcomp-B-more () (interactive) (colorcomp-mod 2 255 1))
(defun colorcomp-R-less () (interactive) (colorcomp-mod 0 0 -1))
(defun colorcomp-G-less () (interactive) (colorcomp-mod 1 0 -1))
(defun colorcomp-B-less () (interactive) (colorcomp-mod 2 0 -1))

(defun colorcomp-copy-as-kill-and-exit ()
  "Copy the color components into the kill ring and kill the buffer.
The string is formatted #RRGGBB (hash followed by six hex digits)."
  (goto-char (point-min))
  (insert "#"
          (format "%02X" (aref colorcomp-data 0))
          (format "%02X" (aref colorcomp-data 1))
          (format "%02X" (aref colorcomp-data 2)))
  (copy-region-as-kill (point-min) (point))
  (kill-buffer nil))

;;; load-time actions

(unless colorcomp-mode-map
  (setq colorcomp-mode-map
        (let ((m (make-sparse-keymap)))
          (suppress-keymap m)
          (define-key m "i" 'colorcomp-R-less)
          (define-key m "o" 'colorcomp-R-more)
          (define-key m "k" 'colorcomp-G-less)
          (define-key m "l" 'colorcomp-G-more)
          (define-key m "," 'colorcomp-B-less)
          (define-key m "." 'colorcomp-B-more)
          (define-key m " " 'colorcomp-copy-as-kill-and-exit)

(provide 'colorcomp)

;;; colorcomp.el ends here

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