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+;;; strokes.el	-- Control Emacs through mouse strokes --
+
+;; Copyright (C) 1997 Free Software Foundation, Inc.
+
+;; Author: David Bakhash <cadet@mit.edu>
+;; Maintainer: David Bakhash <cadet@mit.edu>
+;; Created: 12 April 1997
+;; Keywords: lisp, mouse, extensions
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; This is the strokes package.  It is intended to allow the user to
+;; control Emacs by means of mouse strokes.  Once strokes is loaded, you
+;; can always get help be invoking `strokes-help':
+
+;; > M-x strokes-help
+
+;; and you can learn how to use the package.  A mouse stroke, for now,
+;; can be defined as holding the middle button, for instance, and then
+;; moving the mouse in whatever pattern you wish, which you have set
+;; Emacs to understand as mapping to a given command.  For example, you
+;; may wish the have a mouse stroke that looks like a capital `C' which
+;; means `copy-region-as-kill'.  Treat strokes just like you do key
+;; bindings.  For example, Emacs sets key bindings globally with the
+;; `global-set-key' command.  Likewise, you can do
+
+;; > M-x global-set-stroke
+
+;; to interactively program in a stroke.  It would be wise to set the
+;; first one to this very command, so that from then on, you invoke
+;; `global-set-stroke' with a stroke.  likewise, there may eventually
+;; be a `local-set-stroke' command, also analogous to `local-set-key'.
+
+;; You can always unset the last stroke definition with the command
+
+;; > M-x strokes-unset-last-stroke
+
+;; and the last stroke that was added to `strokes-global-map' will be
+;; removed.
+
+;; Other analogies between strokes and key bindings are as follows:
+
+;;    1) To describe a stroke binding, you can type
+
+;;       > M-x describe-stroke
+
+;;       analogous to `describe-key'.  It's also wise to have a stroke,
+;;       like an `h', for help, or a `?', mapped to `describe-stroke'.
+
+;;    2) stroke bindings are set internally through the Lisp function
+;;       `define-stroke', similar to the `define-key' function.  some
+;;       examples for a 3x3 stroke grid would be
+
+;;       (define-stroke c-mode-stroke-map
+;;                      '((0 . 0) (1 . 1) (2 . 2))
+;;                      'kill-region)
+;;       (define-stroke strokes-global-map
+;;                      '((0 . 0) (0 . 1) (0 . 2) (1 . 2) (2 . 2))
+;;                      'list-buffers)
+
+;;       however, if you would probably just have the user enter in the
+;;       stroke interactively and then set the stroke to whatever he/she
+;;       entered. The Lisp function to interactively read a stroke is
+;;       `strokes-read-stroke'.  This is especially helpful when you're
+;;       on a fast computer that can handle a 9x9 stroke grid.
+
+;;       NOTE: only global stroke bindings are currently implemented,
+;;       however mode- and buffer-local stroke bindings may eventually
+;;       be implemented in a future version.
+
+;; The important variables to be aware of for this package are listed
+;; below.  They can all be altered through the customizing package via
+
+;; > M-x customize
+
+;; and customizing the group named `strokes'.  You can also read
+;; documentation on the variables there.
+
+;; `strokes-minimum-match-score' (determines the threshold of error that
+;; makes a stroke acceptable or unacceptable.  If your strokes arn't
+;; matching, then you should raise this variable.
+
+;; `strokes-grid-resolution' (determines the grid dimensions that you use
+;; when defining/reading strokes.  The finer the grid your computer can
+;; handle, the more you can do, but even a 3x3 grid is pretty cool.)
+;; The default value (7) should be fine for most decent computers.
+;; NOTE: This variable should not be set to a number less than 3.
+
+;; `strokes-display-strokes-buffer' will allow you to hide the strokes
+;; buffer when doing simple strokes.  This is a speedup for slow
+;; computers as well as people who don't want to see their strokes.
+
+;; If you find that your mouse is accelerating too fast, you can
+;; execute the UNIX X command to slow it down.  A good possibility is
+
+;; % xset m 5/4 8
+
+;; which seems, heuristically, to work okay, without much disruption.
+
+;; Whenever you load in the strokes package, you will be able to save
+;; what you've done upon exiting Emacs.  You can also do
+
+;; > M-x save-strokes
+
+;; and it will save your strokes in ~/.strokes, or you may wish to change
+;; this by setting the variable `strokes-file'.
+
+;; Note that internally, all of the routines that are part of this
+;; package are able to deal with complex strokes, as they are a superset
+;; of simple strokes.  However, the default of this package will map
+;; mouse button2 to the command `strokes-do-stroke', and NOT
+;; `strokes-do-complex-stroke'.  If you wish to use complex strokes, you
+;; will have to override this key mapping.  Complex strokes are terminated
+;; with mouse button3.  The strokes package will not interfere with
+;; `mouse-yank', but you may want to examine how this is done (see the
+;; variable `strokes-click-command')
+
+;; To get strokes to work as part of your your setup, then you'll have
+;; put the strokes package in your load-path (preferably byte-compiled)
+;; and then add the following to your .emacs file (or wherever
+;; you put Emacs-specific startup preferences):
+
+;;(and (fboundp 'device-on-window-system-p)
+;;     (device-on-window-system-p)
+;;     (require 'strokes))
+
+;; Once loaded, you can start stroking.  You can also toggle between
+;; strokes mode by simple typing
+
+;; > M-x strokes-mode
+
+;; I am now in the process of porting this package to Emacs.  I also hope
+;; that, with the help of others, this package will be useful in entering
+;; in pictographic-like language text using the mouse (i.e. Korean).
+;; Japanese and Chinese are a bit trickier, but I'm sure that with help
+;; it can be done.  The next version will allow the user to enter strokes
+;; which "remove the pencil from the paper" so to speak, so one character
+;; can have multiple strokes.
+
+;; You can read more about strokes at:
+
+;; http://www.mit.edu/people/cadet/strokes-help.html
+
+;; If you're interested in using strokes for writing English into Emacs
+;; using strokes, then you'll want to read about it on the web page above
+;; or just download from http://www.mit.edu/people/cadet/strokes-abc.el,
+;; which is nothing but a file with some helper commands for inserting
+;; alphanumerics and punctuation.
+
+;; Great thanks to Rob Ristroph for his generosity in letting me use his
+;; PC to develop this, Jason Johnson for his help in algorithms, Euna
+;; Kim for her help in Korean, and massive thanks to the helpful guys
+;; on the help instance on athena (zeno, jered, amu, gsstark, ghudson, etc)
+;; Special thanks to Steve Baur and Hrvoje Niksic for all their help.
+;; And even more thanks to Dave Gillespie for all the elisp help--he
+;; is responsible for helping me use the cl macros at (near) max speed.
+
+;; Tasks: (what I'm getting ready for future version)...
+;; 2) use 'strokes-read-complex-stroke for korean, etc.
+;; 4) buffer-local 'strokes-local-map, and mode-stroke-maps would be nice
+;; 5) 'list-strokes (kinda important).  What do people want?
+;;    How about an optional docstring for each stroke so that a person
+;;    can examine the strokes-file and actually make sense of it?
+;;    (e.g. "This stroke is a pentagram")
+;; 6) add some hooks, like `strokes-read-stroke-hook'
+;; 7) See what people think of the factory settings.  Should I change
+;;    them?  They're all pretty arbitrary in a way.  I guess they
+;;    should be minimal, but computers are getting lots faster, and
+;;    if I choose the defaults too conservatively, then strokes will
+;;    surely dissapoint some people on decent machines (until they
+;;    figure out M-x customize).  I need feedback.
+;; Other: I always have the most beta version of strokes, so if you
+;;        want it just let me know.
+
+;;; Code:
+
+;;; Requirements and provisions...
+
+(autoload 'reporter-submit-bug-report "reporter")
+(autoload 'mail-position-on-field "sendmail")
+(eval-when-compile
+  (mapcar 'require '(pp reporter advice)))
+
+(require 'levents)
+
+;;; Constants...
+
+(defconst strokes-version "0.0-beta")
+
+(defconst strokes-bug-address "cadet@mit.edu")
+
+(defconst strokes-lift 'strokes-lift
+  "Symbol representing a stroke lift event for complex strokes.
+Complex strokes are those which contain two or more simple strokes.
+This will be useful for when Emacs understands Chinese.")
+
+;;; user variables...
+
+(defgroup strokes nil
+  "Control Emacs through mouse strokes"
+  :group 'mouse)
+
+(defcustom strokes-modeline-string " Strokes"
+  "*Modeline identification when strokes are on \(default is \" Strokes\"\)."
+  :type 'string
+  :group 'strokes)
+
+(defcustom strokes-character ?@
+  "*Character used when drawing strokes in the strokes buffer.
+\(The default is lower-case `o', which works okay\)."
+  :type 'character
+  :group 'strokes)
+
+(defcustom strokes-minimum-match-score 1000
+  "*Minimum score for a stroke to be considered a possible match.
+Requiring a perfect match would set this variable to 0.
+The default value is 1000, but it's mostly dependent on how precisely
+you manage to replicate your user-defined strokes.  It also depends on
+the value of `strokes-grid-resolution', since a higher grid resolution
+will correspond to more sample points, and thus more distance
+measurements.  Usually, this is not a problem since you first set
+`strokes-grid-resolution' based on what your computer seems to be able
+to handle (though the defaults are usually more than sufficent), and
+then you can set `strokes-minimum-match-score' to something that works
+for you.  The only purpose of this variable is to insure that if you
+do a bogus stroke that really doesn't match any of the predefined
+ones, then strokes should NOT pick the one that came closest."
+  :type 'integer
+  :group 'strokes)
+
+(defcustom strokes-grid-resolution 9
+  "*Integer defining dimensions of the stroke grid.
+The grid is a square grid, where STROKES-GRID-RESOLUTION defaults to
+`9', making a 9x9 grid whose coordinates go from (0 . 0) on the top
+left to ((STROKES-GRID-RESOLUTION - 1) . (STROKES-GRID-RESOLUTION - 1))
+on the bottom right.  The greater the resolution, the more intricate
+your strokes can be.
+NOTE: This variable should be odd and MUST NOT be less than 3 and need
+      not be greater than 33, which is the resolution of the pixmaps.
+WARNING: Changing the value of this variable will gravely affect the
+         strokes you have already programmed in.  You should try to
+         figure out what it should be based on your needs and on how
+         quick the particular platform(s) you're operating on, and
+         only then start programming in your custom strokes."
+  :type 'integer
+  :group 'strokes)
+
+(defcustom strokes-file "~/.strokes"
+  "*File containing saved strokes for stroke-mode (default is ~/.strokes)."
+  :type 'file
+  :group 'strokes)
+
+(defcustom strokes-buffer-name " *strokes*"
+  "The buffer that the strokes take place in (default is ` *strokes*')."
+  :type 'string
+  :group 'strokes)
+
+(defcustom strokes-use-strokes-buffer t
+  "*If non-nil, the strokes buffer is used and strokes are displayed.
+If nil, strokes will be read the same, however the user will not be
+able to see the strokes.  This be helpful for people who don't like
+the delay in switching to the strokes buffer."
+  :type 'boolean
+  :group 'strokes)
+
+(defcustom strokes-click-command 'mouse-yank-at-click
+  "*Command to execute when stroke is actually a `click' event.
+This is set to `mouse-yank' by default."
+  :type 'function
+  :group 'strokes)
+
+;;; internal variables...
+
+;;;###autoload
+(defvar strokes-mode nil
+  "Non-nil when `strokes' is globally enabled")
+
+(defvar strokes-window-configuration nil
+  "The special window configuration used when entering strokes.
+This is set properly in the function `strokes-update-window-configuration'.")
+
+(defvar strokes-last-stroke nil
+  "Last stroke entered by the user.
+Its value gets set every time the function
+`strokes-fill-stroke' gets called,
+since that is the best time to set the variable")
+
+(defvar strokes-global-map '()
+  "Association list of strokes and their definitions.
+Each entry is (STROKE . COMMAND) where STROKE is itself a list of
+coordinates (X . Y) where X and Y are lists of positions on the
+normalized stroke grid, with the top left at (0 . 0).  COMMAND is the
+corresponding interactive function")
+
+(defvar strokes-load-hook nil
+  "Function or functions to be called when `strokes' is loaded.")
+
+;;; Macros...
+
+(defsubst strokes-click-p (stroke)
+  "Non-nil if STROKE is really click."
+  (< (length stroke) 3))
+
+;;; old, but worked pretty good (just in case)...
+;;(defmacro strokes-define-stroke (stroke-map stroke def)
+;;  "Add STROKE to STROKE-MAP alist with given command DEF"
+;;  (list 'if (list '< (list 'length stroke) 3)
+;;	(list 'error
+;;	      "That's a click, not a stroke.  See `strokes-click-command'")
+;;	(list 'setq stroke-map (list 'cons (list 'cons stroke def)
+;;				     (list 'remassoc stroke stroke-map)))))
+
+(defsubst strokes-remassoc (key list)
+  (remove-if
+   (lambda (element)
+     (equal key (car element)))
+   list))
+
+(defmacro strokes-define-stroke (stroke-map stroke def)
+  "Add STROKE to STROKE-MAP alist with given command DEF."
+  `(if (strokes-click-p ,stroke)
+       (error "That's a click, not a stroke; see `strokes-click-command'")
+     (setq ,stroke-map (cons (cons ,stroke ,def)
+			     (strokes-remassoc ,stroke ,stroke-map)))))
+
+(defalias 'define-stroke 'strokes-define-stroke)
+
+(defsubst strokes-square (x)
+  "Returns the square of the number X"
+  (* x x))
+
+(defsubst strokes-distance-squared (p1 p2)
+  "Gets the distance (squared) between to points P1 and P2.
+P1 and P2 are cons cells in the form (X . Y)."
+  (let ((x1 (car p1))
+	(y1 (cdr p1))
+	(x2 (car p2))
+	(y2 (cdr p2)))
+    (+ (strokes-square (- x2 x1))
+       (strokes-square (- y2 y1)))))
+
+;;; Advice for various functions...
+
+;; I'd originally wanted to write a macro that would just take in the
+;; generic functions which use mouse button2 in various modes.  Most of
+;; them are identical in form: they take an event as the single argument
+;; and then do their thing.  I tried writing a macro that looked
+;; something like this, but failed.  Advice just ain't that easy.  The
+;; one that bugged me the most was `Manual-follow-xref', because that had
+;; &rest arguments, and I didn't know how to work around it in defadvice.
+;; However, I was able to fix up most of the important modes (i.e. the
+;; ones I use all the time).  One `bug' in the program that I just can't
+;; seem to figure out is why I can only advise other button2 functions
+;; successfully when the variable `strokes-use-strokes-buffer' is nil.  I
+;; did all the save-excursion/save-window-excursion stuff SPECIFICALLY so
+;; that using the strokes buffer or not would absolutely not affect any
+;; other part of the program.  If someone can figure out how to make the
+;; following advices work w/ regardless of that variable
+;; `strokes-use-strokes-buffer', then that would be a great victory.  If
+;; someone out there would be kind enough to make the commented code
+;; below work, I'd be grateful.  By the way, I put the `protect' keywords
+;; there to insure that if a stroke went bad, then
+;; `strokes-click-command' would be set back.  If this isn't necessary,
+;; then feel free to let me know.
+
+;; For what follows, I really wanted something that would work like this:
+
+;;(strokes-fix-button2 'vm-mouse-button-2)
+
+;; Or even better, I could have simply done something like:
+
+;;(mapcar 'strokes-fix-button2
+;; 	  '(vm-mouse-button-2
+;;          rmail-summary-mouse-goto-msg
+;;	    <rest of them>))
+
+;;; With help from Hans (author of advice.el)...
+(defmacro strokes-fix-button2-command (command)
+  "Fix COMMAND so that it can also work with strokes.
+COMMAND must take one event argument.
+Example of how one might fix up a command that's bound to button2
+and which is an interactive funcion of one event argument:
+
+\(strokes-fix-button2-command 'rmail-summary-mouse-goto-msg)"
+  (let ((command (eval command)))
+    `(progn
+       (defadvice ,command (around strokes-fix-button2 compile preactivate)
+         ,(format "Fix %s to work with strokes." command)
+         (if strokes-use-strokes-buffer
+             ;; then strokes is no good and we'll have to use the original
+             ad-do-it
+           ;; otherwise, we can make strokes work too...
+	     (let ((strokes-click-command
+                  ',(intern (format "ad-Orig-%s" command))))
+             (strokes-do-stroke (ad-get-arg 0))))))))
+
+(strokes-fix-button2-command 'vm-mouse-button-2)
+(strokes-fix-button2-command 'rmail-summary-mouse-goto-msg)
+(strokes-fix-button2-command 'Buffer-menu-mouse-select)
+(strokes-fix-button2-command 'w3-widget-button-click)
+(strokes-fix-button2-command 'widget-image-button-press)
+(strokes-fix-button2-command 'Info-follow-clicked-node)
+(strokes-fix-button2-command 'compile-mouse-goto-error)
+(strokes-fix-button2-command 'gdbsrc-select-or-yank)
+(strokes-fix-button2-command 'hypropos-mouse-get-doc)
+(strokes-fix-button2-command 'gnus-mouse-pick-group)
+(strokes-fix-button2-command 'gnus-mouse-pick-article)
+(strokes-fix-button2-command 'gnus-article-push-button)
+(strokes-fix-button2-command 'dired-mouse-find-file)
+(strokes-fix-button2-command 'url-dired-find-file-mouse)
+(strokes-fix-button2-command 'dired-u-r-mouse-toggle)
+(strokes-fix-button2-command 'dired-u-w-mouse-toggle)
+(strokes-fix-button2-command 'dired-u-x-mouse-toggle)
+(strokes-fix-button2-command 'dired-g-r-mouse-toggle)
+(strokes-fix-button2-command 'dired-g-w-mouse-toggle)
+(strokes-fix-button2-command 'dired-g-x-mouse-toggle)
+(strokes-fix-button2-command 'dired-o-r-mouse-toggle)
+(strokes-fix-button2-command 'dired-o-w-mouse-toggle)
+(strokes-fix-button2-command 'isearch-yank-x-selection)
+(strokes-fix-button2-command 'occur-mode-mouse-goto)
+(strokes-fix-button2-command 'cvs-mouse-find-file)
+
+;;; I can fix the customize widget button click, but then
+;;; people will get confused when they try to customize
+;;; strokes with the mouse and customize tells them that
+;;; `strokes-click-command' is mapped to `ad-Orig-widget-button-click'
+;;(strokes-fix-button2-command 'widget-button-click)
+
+;;; without the advice, each advised function would look like...
+;;(defadvice vm-mouse-button-2 (around vm-strokes activate protect)
+;;  "Allow strokes to work in VM."
+;;  (if strokes-use-strokes-buffer
+;;      ;; then strokes is no good and we'll have to use the original
+;;      ad-do-it
+;;    ;; otherwise, we can make strokes work too...
+;;    (let ((strokes-click-command 'ad-Orig-vm-mouse-button-2))
+;;      (strokes-do-stroke (ad-get-arg 0)))))
+
+;;; Functions...
+
+(defsubst strokes-mouse-event-p (event)
+  (or (motion-event-p event)
+      (button-press-event-p event)
+      (button-release-event-p event)))
+
+(defun strokes-event-closest-point-1 (window &optional line)
+  "Return position of start of line LINE in WINDOW.
+If LINE is nil, return the last position visible in WINDOW."
+  (let* ((total (- (window-height window)
+		   (if (window-minibuffer-p window)
+		       0 1)))
+	 (distance (or line total)))
+    (save-excursion
+      (goto-char (window-start window))
+      (if (= (vertical-motion distance) distance)
+	  (if (not line)
+	      (forward-char -1)))
+      (point))))
+
+(defun strokes-event-closest-point (event &optional start-window)
+  "Return the nearest position to where EVENT ended its motion.
+This is computed for the window where EVENT's motion started,
+or for window WINDOW if that is specified."
+  (or start-window (setq start-window (posn-window (event-start event))))
+  (if (eq start-window (posn-window (event-end event)))
+      (if (eq (event-point event) 'vertical-line)
+	  (strokes-event-closest-point-1 start-window
+					 (cdr (posn-col-row (event-end event))))
+	(if (eq (event-point event) 'mode-line)
+	    (strokes-event-closest-point-1 start-window)
+	  (event-point event)))
+    ;; EVENT ended in some other window.
+    (let* ((end-w (posn-window (event-end event)))
+	   (end-w-top)
+	   (w-top (nth 1 (window-edges start-window))))
+      (setq end-w-top
+	    (if (windowp end-w)
+		(nth 1 (window-edges end-w))
+	      (/ (cdr (posn-x-y (event-end event)))
+		 ((frame-char-height end-w)))))
+      (if (>= end-w-top w-top)
+	  (strokes-event-closest-point-1 start-window)
+	(window-start start-window)))))
+
+(defun strokes-lift-p (object)
+  "Return non-nil if object is a stroke-lift."
+  (eq object strokes-lift))
+
+(defun strokes-unset-last-stroke ()
+  "Undo the last stroke definition."
+  (interactive)
+  (let ((command (cdar strokes-global-map)))
+    (if (y-or-n-p-maybe-dialog-box
+	 (format "really delete last stroke definition, defined to `%s'? "
+		 command))
+	(progn
+	  (setq strokes-global-map (cdr strokes-global-map))
+	  (message "That stroke has been deleted"))
+      (message "Nothing done"))))
+
+;;;###autoload
+(defun strokes-global-set-stroke (stroke command)
+  "Interactively give STROKE the global binding as COMMAND.
+Operated just like `global-set-key', except for strokes.
+COMMAND is a symbol naming an interactively-callable function.  STROKE
+is a list of sampled positions on the stroke grid as described in the
+documentation for the `strokes-define-stroke' function."
+  (interactive
+   (list
+    (and (or strokes-mode (strokes-mode t))
+	 (strokes-read-complex-stroke
+	  "Define a new stroke.  Draw with button1 (or 2).  End with button3..."))
+    (read-command "command to map stroke to: ")))
+  (strokes-define-stroke strokes-global-map stroke command))
+
+;;;###autoload
+(defalias 'global-set-stroke 'strokes-global-set-stroke)
+
+;;(defun global-unset-stroke (stroke); FINISH THIS DEFUN!
+;;  "delete all strokes matching STROKE from `strokes-global-map',
+;; letting the user input
+;; the stroke with the mouse"
+;;  (interactive
+;;   (list
+;;    (strokes-read-stroke "Enter the stroke you want to delete...")))
+;;  (strokes-define-stroke 'strokes-global-map stroke command))
+
+(defun strokes-get-grid-position (stroke-extent position &optional grid-resolution)
+  "Map POSITION to a new grid position based on its STROKE-EXTENT and GRID-RESOLUTION.
+STROKE-EXTENT as a list \(\(XMIN . YMIN\) \(XMAX . YMAX\)\).
+If POSITION is a `strokes-lift', then it is itself returned.
+Optional GRID-RESOLUTION may be used in place of STROKES-GRID-RESOLUTION.
+The grid is a square whose dimesion is [0,GRID-RESOLUTION)."
+  (cond ((consp position)		; actual pixel location
+	 (let ((grid-resolution (or grid-resolution strokes-grid-resolution))
+	       (x (car position))
+	       (y (cdr position))
+	       (xmin (caar stroke-extent))
+	       (ymin (cdar stroke-extent))
+	       ;; the `1+' is there to insure that the
+	       ;; formula evaluates correctly at the boundaries
+	       (xmax (1+ (caadr stroke-extent)))
+	       (ymax (1+ (cdadr stroke-extent))))
+	   (cons (floor (* grid-resolution
+			   (/ (float (- x xmin))
+			      (- xmax xmin))))
+		 (floor (* grid-resolution
+			   (/ (float (- y ymin))
+			      (- ymax ymin)))))))
+	((strokes-lift-p position)	; stroke lift
+	 strokes-lift)))
+
+;;(defun strokes-get-grid-position (stroke-extent pix-pos)
+;;  "Return the stroke-grid position for PIX-POS given the total STROKE-EXTENT.
+;;STROKE-EXTENT as a list \(\(xmin . ymin\) \(xmax . ymax\)\) and a particular
+;;pixel position or `strokes-lift', find the corresponding grid position
+;;\(based on `strokes-grid-resolution'\) for the PIX-POS."
+;;  (cond ((consp pix-pos)		; actual pixel location
+;;	 (let ((x (car pix-pos))
+;;	       (y (cdr pix-pos))
+;;	       (xmin (caar stroke-extent))
+;;	       (ymin (cdar stroke-extent))
+;;	       ;; the `1+' is there to insure that the
+;;	       ;; formula evaluates correctly at the boundaries
+;;	       (xmax (1+ (caadr stroke-extent)))
+;;	       (ymax (1+ (cdadr stroke-extent))))
+;;	   (cons (floor (* strokes-grid-resolution
+;;			   (/ (float (- x xmin))
+;;			      (- xmax xmin))))
+;;		 (floor (* strokes-grid-resolution
+;;			   (/ (float (- y ymin))
+;;			      (- ymax ymin)))))))
+;;	((strokes-lift-p pix-pos)	; stroke lift
+;;	 strokes-lift)))
+
+(defun strokes-get-stroke-extent (pixel-positions)
+  "From a list of absolute PIXEL-POSITIONS, returns absolute spatial extent.
+The return value is a list ((XMIN . YMIN) (XMAX . YMAX))."
+  (if pixel-positions
+      (let ((xmin (caar pixel-positions))
+	    (xmax (caar pixel-positions))
+	    (ymin (cdar pixel-positions))
+	    (ymax (cdar pixel-positions))
+	    (rest (cdr pixel-positions)))
+	(while rest
+	  (if (consp (car rest))
+	      (let ((x (caar rest))
+		    (y (cdar rest)))
+		(if (< x xmin)
+		    (setq xmin x))
+		(if (> x xmax)
+		    (setq xmax x))
+		(if (< y ymin)
+		    (setq ymin y))
+		(if (> y ymax)
+		    (setq ymax y))))
+	  (setq rest (cdr rest)))
+	(let ((delta-x (- xmax xmin))
+	      (delta-y (- ymax ymin)))
+	  (if (> delta-x delta-y)
+	      (setq ymin (- ymin
+			    (/ (- delta-x delta-y)
+			       2))
+		    ymax (+ ymax
+			    (/ (- delta-x delta-y)
+			       2)))
+	    (setq xmin (- xmin
+			  (/ (- delta-y delta-x)
+			     2))
+		  xmax (+ xmax
+			  (/ (- delta-y delta-x)
+			     2))))
+	  (list (cons xmin ymin)
+		(cons xmax ymax))))
+    nil))
+
+(defun strokes-eliminate-consecutive-redundancies (entries)
+  "Returns a list with no consecutive redundant entries."
+  ;; defun a grande vitesse grace a Dave G.
+  (loop for element on entries
+        if (not (equal (car element) (cadr element)))
+        collect (car element)))
+;;  (loop for element on entries
+;;        nconc (if (not (equal (car el) (cadr el)))
+;;                  (list (car el)))))
+;; yet another (orig) way of doing it...
+;;  (if entries
+;;      (let* ((current (car entries))
+;;	     (rest (cdr entries))
+;;	     (non-redundant-list (list current))
+;;	     (next nil))
+;;	(while rest
+;;	  (setq next (car rest))
+;;	  (if (equal current next)
+;;	      (setq rest (cdr rest))
+;;	    (setq non-redundant-list (cons next non-redundant-list)
+;;		  current next
+;;		  rest (cdr rest))))
+;;	(nreverse non-redundant-list))
+;;    nil))
+
+(defun strokes-renormalize-to-grid (positions &optional grid-resolution)
+  "Map POSITIONS to a new grid whose dimensions are based on GRID-RESOLUTION.
+POSITIONS is a list of positions and stroke-lifts.
+Optional GRID-RESOLUTION may be used in place of STROKES-GRID-RESOLUTION.
+The grid is a square whose dimesion is [0,GRID-RESOLUTION)."
+  (or grid-resolution (setq grid-resolution strokes-grid-resolution))
+  (let ((stroke-extent (strokes-get-stroke-extent positions)))
+    (mapcar (function
+	     (lambda (pos)
+	       (strokes-get-grid-position stroke-extent pos grid-resolution)))
+	    positions)))
+
+;;(defun strokes-normalize-pixels-to-grid (pixel-positions)
+;;  "Map PIXEL-POSITIONS to the stroke grid.
+;;PIXEL-POSITIONS is a list of pixel-positions and stroke-lifts.  The
+;;normalized stroke grid is defined by the variable STROKES-GRID-RESOLUTION"
+;;  (let ((stroke-extent (strokes-get-stroke-extent pixel-positions)))
+;;    (mapcar (function
+;;	     (lambda (pix-pos)
+;;	       (strokes-get-grid-position stroke-extent pix-pos)))
+;;	    pixel-positions)))
+
+(defun strokes-fill-stroke (unfilled-stroke &optional force)
+  "Fill in missing grid locations in the list of UNFILLED-STROKE.
+If FORCE is non-nil, then fill the stroke even if it's `stroke-click'.
+NOTE: This is where the global variable `strokes-last-stroke' is set."
+  (setq strokes-last-stroke		; this is global
+	(if (and (strokes-click-p unfilled-stroke)
+		 (not force))
+	    unfilled-stroke
+	  (loop for grid-locs on unfilled-stroke
+		nconc (let* ((current (car grid-locs))
+			     (current-is-a-point-p (consp current))
+			     (next (cadr grid-locs))
+			     (next-is-a-point-p (consp next))
+			     (both-are-points-p (and current-is-a-point-p
+						     next-is-a-point-p))
+			     (x1 (and current-is-a-point-p
+				      (car current)))
+			     (y1 (and current-is-a-point-p
+				      (cdr current)))
+			     (x2 (and next-is-a-point-p
+				      (car next)))
+			     (y2 (and next-is-a-point-p
+				      (cdr next)))
+			     (delta-x (and both-are-points-p
+					   (- x2 x1)))
+			     (delta-y (and both-are-points-p
+					   (- y2 y1)))
+			     (slope (and both-are-points-p
+					 (if (zerop delta-x)
+					     nil ; undefined vertical slope
+					   (/ (float delta-y)
+					      delta-x)))))
+			(cond ((not both-are-points-p)
+			       (list current))
+			      ((null slope) ; undefinded vertical slope
+			       (if (>= delta-y 0)
+				   (loop for y from y1 below y2
+					 collect (cons x1 y))
+				 (loop for y from y1 above y2
+				       collect (cons x1 y))))
+			      ((zerop slope) ; (= y1 y2)
+			       (if (>= delta-x 0)
+				   (loop for x from x1 below x2
+					 collect (cons x y1))
+				 (loop for x from x1 above x2
+				       collect (cons x y1))))
+			      ((>= (abs delta-x) (abs delta-y))
+			       (if (> delta-x 0)
+				   (loop for x from x1 below x2
+					 collect (cons x
+						       (+ y1
+							  (round (* slope
+								    (- x x1))))))
+				 (loop for x from x1 above x2
+				       collect (cons x
+						     (+ y1
+							(round (* slope
+								  (- x x1))))))))
+			      (t	; (< (abs delta-x) (abs delta-y))
+			       (if (> delta-y 0)
+				   (loop for y from y1 below y2
+					 collect (cons (+ x1
+							  (round (/ (- y y1)
+								    slope)))
+						       y))
+				 (loop for y from y1 above y2
+				       collect (cons (+ x1
+							(round (/ (- y y1)
+								  slope)))
+						     y))))))))))
+
+(defun strokes-rate-stroke (stroke1 stroke2)
+  "Rates STROKE1 with STROKE2 and returns a score based on a distance metric.
+Note: the rating is an error rating, and therefore, a return of 0
+represents a perfect match.  Also note that the order of stroke
+arguments is order-independent for the algorithm used here."
+  (if (and stroke1 stroke2)
+      (let ((rest1 (cdr stroke1))
+	    (rest2 (cdr stroke2))
+	    (err (strokes-distance-squared (car stroke1)
+					   (car stroke2))))
+	(while (and rest1 rest2)
+	  (while (and (consp (car rest1))
+		      (consp (car rest2)))
+	    (setq err (+ err
+			 (strokes-distance-squared (car rest1)
+						   (car rest2)))
+		  stroke1 rest1
+		  stroke2 rest2
+		  rest1 (cdr stroke1)
+		  rest2 (cdr stroke2)))
+	  (cond ((and (strokes-lift-p (car rest1))
+		      (strokes-lift-p (car rest2)))
+		 (setq rest1 (cdr rest1)
+		       rest2 (cdr rest2)))
+		((strokes-lift-p (car rest2))
+		 (while (consp (car rest1))
+		   (setq err (+ err
+				(strokes-distance-squared (car rest1)
+							  (car stroke2)))
+			 rest1 (cdr rest1))))
+		((strokes-lift-p (car rest1))
+		 (while (consp (car rest2))
+		   (setq err (+ err
+				(strokes-distance-squared (car stroke1)
+							  (car rest2)))
+			 rest2 (cdr rest2))))))
+	(if (null rest2)
+	    (while (consp (car rest1))
+	      (setq err (+ err
+			   (strokes-distance-squared (car rest1)
+						     (car stroke2)))
+		    rest1 (cdr rest1))))
+	(if (null rest1)
+	    (while (consp (car rest2))
+	      (setq err (+ err
+			   (strokes-distance-squared (car stroke1)
+						     (car rest2)))
+		    rest2 (cdr rest2))))
+	(if (or (strokes-lift-p (car rest1))
+		(strokes-lift-p (car rest2)))
+	    (setq err nil)
+	  err))
+    nil))
+
+(defun strokes-match-stroke (stroke stroke-map)
+  "Finds the best matching command of STROKE in STROKE-MAP.
+Returns the corresponding match as (COMMAND . SCORE)."
+  (if (and stroke stroke-map)
+      (let ((score (strokes-rate-stroke stroke (caar stroke-map)))
+	    (command (cdar stroke-map))
+	    (map (cdr stroke-map)))
+	(while map
+	  (let ((newscore (strokes-rate-stroke stroke (caar map))))
+	    (if (or (and newscore score (< newscore score))
+		    (and newscore (null score)))
+		(setq score newscore
+		      command (cdar map)))
+	    (setq map (cdr map))))
+	(if score
+	    (cons command score)
+	  nil))
+    nil))
+
+;;;###autoload
+(defun strokes-read-stroke (&optional prompt event)
+  "Read a simple stroke (interactively) and return the stroke.
+Optional PROMPT in minibuffer displays before and during stroke reading.
+This function will display the stroke interactively as it is being
+entered in the strokes buffer if the variable
+`strokes-use-strokes-buffer' is non-nil.
+Optional EVENT is currently not used, but hopefully will be soon."
+  (save-excursion
+    (track-mouse
+      (let ((pix-locs nil)
+	    (grid-locs nil)
+	    (event nil))
+	(if strokes-use-strokes-buffer
+	    ;; switch to the strokes buffer and
+	    ;; display the stroke as it's being read
+	    (save-window-excursion
+	      (set-window-configuration strokes-window-configuration)
+	      (if prompt
+		  (progn
+		    (message prompt)
+		    (setq event (read-event))
+		    (while (not (button-press-event-p event))
+		      (setq event (read-event)))))
+	      (unwind-protect
+		  (progn
+		    (setq event (read-event))
+		    (while (not (button-release-event-p event))
+		      (if (strokes-mouse-event-p event)
+			  (let ((point (strokes-event-closest-point event)))
+			    (when point
+			      (goto-char point)
+			      (subst-char-in-region point (1+ point) ?\  strokes-character))
+			    (push (cons (event-x-pixel event)
+					(event-y-pixel event))
+				  pix-locs)))
+		      (setq event (read-event))))
+		;; protected
+		;; clean up strokes buffer and then bury it.
+		(when (equal (buffer-name) strokes-buffer-name)
+		  (subst-char-in-region (point-min) (point-max) strokes-character ?\ )
+		  (goto-char (point-min))
+		  (bury-buffer))))
+	  ;; Otherwise, don't use strokes buffer and read stroke silently
+	  (if prompt
+	      (progn
+		(message prompt)
+		(setq event (read-event))
+		(while (not (button-press-event-p event))
+		  (setq event (read-event)))))
+	  (setq event (read-event))
+	  (while (not (button-release-event-p event))
+	    (if (strokes-mouse-event-p event)
+		(push (cons (event-x-pixel event)
+			    (event-y-pixel event))
+		      pix-locs))
+	    (setq event (read-event))))
+	(setq grid-locs (strokes-renormalize-to-grid (nreverse pix-locs)))
+	(strokes-fill-stroke (strokes-eliminate-consecutive-redundancies grid-locs))))))
+
+;;;###autoload
+(defun strokes-read-complex-stroke (&optional prompt event)
+  "Read a complex stroke (interactively) and return the stroke.
+Optional PROMPT in minibuffer displays before and during stroke reading.
+Note that a complex stroke allows the user to pen-up and pen-down.  This
+is implemented by allowing the user to paint with button1 or button2 and
+then complete the stroke with button3.
+Optional EVENT is currently not used, but hopefully will be soon."
+  (save-excursion
+    (save-window-excursion
+      (track-mouse
+	(set-window-configuration strokes-window-configuration)
+	(let ((pix-locs nil)
+	      (grid-locs nil)
+	      (event (or event (read-event))))
+	  (if prompt
+	      (while (not (button-press-event-p event))
+		(message prompt)
+		(setq event (read-event))))
+	  (unwind-protect
+	      (progn
+		(setq event (read-event))
+		(while (not (and (button-press-event-p event)
+				 (eq (event-button event) 3)))
+		  (while (not (button-release-event-p event))
+		    (if (strokes-mouse-event-p event)
+			(let ((point (strokes-event-closest-point event)))
+			  (when point
+			    (goto-char point)
+			    (subst-char-in-region point (1+ point) ?\ strokes-character))
+			  (push (cons (event-x-pixel event)
+				      (event-y-pixel event))
+				pix-locs)))
+		    (setq event (read-event)))
+		  (push strokes-lift pix-locs)
+		  (while (not (button-press-event-p event))
+		    (setq event (read-event))))
+		;; ### KLUDGE! ### sit and wait
+		;; for some useless event to
+		;; happen to fix the minibuffer bug.
+		(while (not (button-release-event-p (read-event))))
+		(setq pix-locs (nreverse (cdr pix-locs))
+		      grid-locs (strokes-renormalize-to-grid pix-locs))
+		(strokes-fill-stroke
+		 (strokes-eliminate-consecutive-redundancies grid-locs)))
+	    ;; protected
+	    (when (equal (buffer-name) strokes-buffer-name)
+	      (subst-char-in-region (point-min) (point-max) strokes-character ?\ )
+	      (goto-char (point-min))
+	      (bury-buffer))))))))
+
+(defun strokes-execute-stroke (stroke)
+  "Given STROKE, execute the command which corresponds to it.
+The command will be executed provided one exists for that stroke,
+based on the variable `strokes-minimum-match-score'.
+If no stroke matches, nothing is done and return value is nil."
+  (let* ((match (strokes-match-stroke stroke strokes-global-map))
+	 (command (car match))
+	 (score (cdr match)))
+    (cond ((strokes-click-p stroke)
+	   ;; This is the case of a `click' type event
+	   (command-execute strokes-click-command))
+	  ((and match (<= score strokes-minimum-match-score))
+	   (message "%s" command)
+	   (command-execute command))
+	  ((null strokes-global-map)
+	   (if (file-exists-p strokes-file)
+	       (and (y-or-n-p-maybe-dialog-box
+		     (format "No strokes loaded.  Load `%s'? "
+			     strokes-file))
+		    (strokes-load-user-strokes))
+	     (error "No strokes defined; use `global-set-stroke'")))
+	  (t
+	   (error
+	    "No stroke matches; see variable `strokes-minimum-match-score'")
+	   nil))))
+
+;;;###autoload
+(defun strokes-do-stroke (event)
+  "Read a simple stroke from the user and then exectute its comand.
+This must be bound to a mouse event."
+  (interactive "e")
+  (or strokes-mode (strokes-mode t))
+  (strokes-execute-stroke (strokes-read-stroke nil event)))
+
+;;;###autoload
+(defun strokes-do-complex-stroke (event)
+  "Read a complex stroke from the user and then exectute its command.
+This must be bound to a mouse event."
+  (interactive "e")
+  (or strokes-mode (strokes-mode t))
+  (strokes-execute-stroke (strokes-read-complex-stroke nil event)))
+
+;;;###autoload
+(defun strokes-describe-stroke (stroke)
+  "Displays the command which STROKE maps to, reading STROKE interactively."
+  (interactive
+   (list
+    (strokes-read-complex-stroke
+     "Enter stroke to describe; end with button3...")))
+  (let* ((match (strokes-match-stroke stroke strokes-global-map))
+	 (command (or (and (strokes-click-p stroke)
+			   strokes-click-command)
+		      (car match)))
+	 (score (cdr match)))
+    (if (or (and match
+		 (<= score strokes-minimum-match-score))
+	    (and (strokes-click-p stroke)
+		 strokes-click-command))
+	(message "That stroke maps to `%s'" command)
+      (message "That stroke is undefined"))
+    (sleep-for 1)))			; helpful for recursive edits
+
+;;;###autoload
+(defalias 'describe-stroke 'strokes-describe-stroke)
+
+;;; ### FORGET IT!  I COULN'T GET THE EMACS READER TO PARSE THIS FUNCTION ###
+;;;###autoload
+;;(defun strokes-help ()
+;;  "Get instructional help on using the the `strokes' package."
+;;  (interactive)
+;;  (with-output-to-temp-buffer "*Help with Strokes*"
+;;    (let ((helpdoc
+;;	   "This is help for the strokes package.
+
+;;If you find something wrong with strokes, or feel that it can be
+;;improved in some way, then please feel free to email me:
+
+;;David Bakhash <cadet@mit.edu>
+
+;;or just do
+
+;;M-x strokes-report-bug
+
+;;------------------------------------------------------------
+
+;;** Strokes...
+
+;;The strokes package allows you to define strokes, made with
+;;the mouse or other pointer device, that Emacs can interpret as
+;;corresponding to commands, and then executes the commands.  It does
+;;character recognition, so you don't have to worry about getting it
+;;right every time.
+
+;;Strokes are easy to program and fun to use.  To start strokes going,
+;;you'll want to put the following line in your .emacs file as mentioned
+;;in the commentary to strokes.el.
+
+;;This will load strokes when and only when you start Emacs on a window
+;;system, with a mouse or other pointer device defined.
+
+;;To toggle strokes-mode, you just do
+
+;;> M-x strokes-mode
+
+;;** Strokes for controling the behavior of Emacs...
+
+;;When you're ready to start defining strokes, just use the command
+
+;;> M-x global-set-stroke
+
+;;You will see a ` *strokes*' buffer which is waiting for you to enter in
+;;your stroke.  When you enter in the stroke, you draw with button1 or
+;;button2, and then end with button3.  Next, you enter in the command
+;;which will be executed when that stroke is invoked.  Simple as that.
+;;For now, try to define a stroke to copy a region.  This is a popular
+;;edit command, so type
+
+;;> M-x global-set-stroke
+
+;;Then, in the ` *strokes*' buffer, draw the letter `C' (for `copy'\)
+;;and then, when it asks you to enter the command to map that to, type
+
+;;> copy-region-as-kill
+
+;;That's about as hard as it gets.
+;;Remember: paint with button1 or button2 and then end with button3.
+
+;;If ever you want to know what a certain strokes maps to, then do
+
+;;> M-x describe-stroke
+
+;;and you can enter in any arbitrary stroke.  Remember: The strokes
+;;package lets you program in simple and complex, or multi-lift, strokes.
+;;The only difference is how you *invoke* the two.  You will most likely
+;;use simple strokes, as complex strokes were developed for
+;;Chinese/Japanese/Korean.  So the middle mouse button, button2, will
+;;invoke the command `strokes-do-stroke' in buffers where button2 doesn't
+;;already have a meaning other than its original, which is `mouse-yank'.
+;;But don't worry: `mouse-yank' will still work with strokes.  See the
+;;variable `strokes-click-command'.
+
+;;If ever you define a stroke which you don't like, then you can unset
+;;it with the command
+
+;;> M-x strokes-unset-last-stroke
+
+;;Your strokes are stored as you enter them.  They get saved in a file
+;;called ~/.strokes, along with other strokes configuration variables.
+;;You can change this location by setting the variable `strokes-file'.
+;;You will be prompted to save them when you exit Emacs, or you can save
+;;them with
+
+;;> M-x save-strokes
+
+;;Your strokes get loaded automatically when you enable `strokes-mode'.
+;;You can also load in your user-defined strokes with
+
+;;> M-x load-user-strokes
+
+;;** A few more important things...
+
+;;o The command `strokes-do-stroke' is also invoked with M-button2, so that you
+;;  can still enter a stroke in modes which use button2 for other things,
+;;  such as cross-referencing.
+
+;;o Strokes are a bit computer-dependent in that they depend somewhat on
+;;  the speed of the computer you're working on.  This means that you
+;;  may have to tweak some variables.  You can read about them in the
+;;  commentary of `strokes.el'.  Better to just use apropos and read their
+;;  docstrings.  All variables/functions start with `strokes'.  The one
+;;  variable which many people wanted to see was
+;;  `strokes-use-strokes-buffer' which allows the user to use strokes
+;;  silently--without displaying the strokes.  All variables can be set
+;;  by customizing the group named `strokes' via the customization package:
+
+;;  > M-x customize"))
+;;    (save-excursion
+;;	(princ helpdoc)
+;;	(set-buffer standard-output)
+;;	(help-mode))
+;;      (print-help-return-message)))))
+
+(defun strokes-report-bug ()
+  "Submit a bug report for strokes."
+  (interactive)
+  (let ((reporter-prompt-for-summary-p t))
+    (or (boundp 'reporter-version)
+	(setq reporter-version
+	      "Your version of reporter is obsolete.  Please upgrade."))
+    (reporter-submit-bug-report
+     strokes-bug-address "Strokes"
+     (cons
+      'strokes-version
+      (nconc
+       (mapcar
+	'intern
+	(sort
+	 (let (completion-ignore-case)
+	   (all-completions "strokes-" obarray 'user-variable-p))
+	 'string-lessp))
+       (list 'reporter-version)))
+     (function
+      (lambda ()
+	(save-excursion
+	  (mail-position-on-field "subject")
+	  (beginning-of-line)
+	  (skip-chars-forward "^:\n")
+	  (if (looking-at ": Strokes;")
+	      (progn
+		(goto-char (match-end 0))
+		(delete-char -1)
+		(insert " " strokes-version " bug:")))))))))
+
+(defsubst strokes-fill-current-buffer-with-whitespace ()
+  "Erase the contents of the current buffer and fill it with whitespace"
+  (erase-buffer)
+  (loop repeat (frame-height) do
+	(insert-char ?\  (1- (frame-width)))
+	(newline))
+  (goto-char (point-min)))
+
+(defun strokes-update-window-configuration ()
+  "Insure that `strokes-window-configuration' is up-to-date."
+  (interactive)
+  (let ((current-window (selected-window)))
+    (cond ((or (window-minibuffer-p current-window)
+	       (window-dedicated-p current-window))
+	   ;; don't try to update strokes window configuration
+	   ;; if window is dedicated or a minibuffer
+	   nil)
+	  ((or (interactive-p)
+	       (not (buffer-live-p (get-buffer strokes-buffer-name)))
+	       (null strokes-window-configuration))
+	   ;; create `strokes-window-configuration' from scratch...
+	   (save-excursion
+	     (save-window-excursion
+	       (get-buffer-create strokes-buffer-name)
+	       (set-window-buffer current-window strokes-buffer-name)
+	       (delete-other-windows)
+	       (fundamental-mode)
+	       (auto-save-mode 0)
+	       (if (featurep 'font-lock)
+		   (font-lock-mode 0))
+	       (abbrev-mode 0)
+	       (buffer-disable-undo (current-buffer))
+	       (setq truncate-lines nil)
+	       (strokes-fill-current-buffer-with-whitespace)
+	       (setq strokes-window-configuration (current-window-configuration))
+	       (bury-buffer))))
+	  (t				; `strokes buffer' still exists...
+	   ;; update the strokes-window-configuration for this specific frame...
+	   (save-excursion
+	     (save-window-excursion
+	       (set-window-buffer current-window strokes-buffer-name)
+	       (delete-other-windows)
+	       (strokes-fill-current-buffer-with-whitespace)
+	       (setq strokes-window-configuration (current-window-configuration))
+	       (bury-buffer)))))))
+
+;;;###autoload
+(defun strokes-load-user-strokes ()
+  "Load user-defined strokes from file named by `strokes-file'."
+  (interactive)
+  (cond ((and (file-exists-p strokes-file)
+	      (file-readable-p strokes-file))
+	 (load-file strokes-file))
+	((interactive-p)
+	 (error "Trouble loading user-defined strokes; nothing done"))
+	(t
+	 (message "No user-defined strokes, sorry"))))
+
+;;;###autoload
+(defalias 'load-user-strokes 'strokes-load-user-strokes)
+
+(defun strokes-prompt-user-save-strokes ()
+  "Save user-defined strokes to file named by `strokes-file'."
+  (interactive)
+  (save-excursion
+    (let ((current strokes-global-map))
+      (unwind-protect
+	  (progn
+	    (setq strokes-global-map nil)
+	    (strokes-load-user-strokes)
+	    (if (and (not (equal current strokes-global-map))
+		     (or (interactive-p)
+			 (yes-or-no-p-maybe-dialog-box "save your strokes? ")))
+		(progn
+		  (require 'pp)		; pretty-print variables
+		  (message "Saving strokes in %s..." strokes-file)
+		  (get-buffer-create "*saved-strokes*")
+		  (set-buffer "*saved-strokes*")
+		  (erase-buffer)
+		  (emacs-lisp-mode)
+		  (goto-char (point-min))
+		  (insert-string
+		   ";;   -*- Syntax: Emacs-Lisp; Mode: emacs-lisp -*-\n")
+		  (insert-string (format ";;; saved strokes for %s, as of %s\n\n"
+					 (user-full-name)
+					 (format-time-string "%B %e, %Y" nil)))
+		  (message "Saving strokes in %s..." strokes-file)
+		  (insert-string (format "(setq strokes-global-map '%s)"
+					 (pp current)))
+		  (message "Saving strokes in %s..." strokes-file)
+		  (indent-region (point-min) (point-max) nil)
+		  (write-region (point-min)
+				(point-max)
+				strokes-file))
+	      (message "(no changes need to be saved)")))
+	;; protected
+	(if (get-buffer "*saved-strokes*")
+	    (kill-buffer (get-buffer "*saved-strokes*")))
+	(setq strokes-global-map current)))))
+
+(defalias 'save-strokes 'strokes-prompt-user-save-strokes)
+
+(defun strokes-toggle-strokes-buffer (&optional arg)
+  "Toggle the use of the strokes buffer.
+In other words, toggle the variabe `strokes-use-strokes-buffer'.
+With ARG, use strokes buffer if and only if ARG is positive or true.
+Returns value of `strokes-use-strokes-buffer'."
+  (interactive "P")
+  (setq strokes-use-strokes-buffer
+	(if arg (> (prefix-numeric-value arg) 0)
+	  (not strokes-use-strokes-buffer))))
+
+;;;###autoload
+(defun strokes-mode (&optional arg)
+  "Toggle strokes being enabled.
+With ARG, turn strokes on if and only if ARG is positive or true.
+Note that `strokes-mode' is a global mode.  Think of it as a minor
+mode in all buffers when activated.
+By default, strokes are invoked with mouse button-2.  You can define
+new strokes with
+
+> M-x global-set-stroke
+
+To use strokes for pictographic editing, such as Chinese/Japanese, use
+Sh-button-2, which draws strokes and inserts them.  Encode/decode your
+strokes with
+
+> M-x strokes-encode-buffer
+> M-x strokes-decode-buffer"
+  (interactive "P")
+  (let ((on-p (if arg
+		  (> (prefix-numeric-value arg) 0)
+		(not strokes-mode))))
+    (cond ((not window-system)
+	   (error "Can't use strokes without windows"))
+	  (on-p				; turn on strokes
+	   (and (file-exists-p strokes-file)
+		(null strokes-global-map)
+		(strokes-load-user-strokes))
+	   (add-hook 'kill-emacs-hook
+		     'strokes-prompt-user-save-strokes)
+	   (add-hook 'select-frame-hook
+		     'strokes-update-window-configuration)
+	   (strokes-update-window-configuration)
+	   (define-key global-map [(button2)] 'strokes-do-stroke)
+	   (define-key global-map [(meta button2)] 'strokes-do-stroke)
+	   ;;	   (define-key global-map [(control button2)] 'strokes-do-complex-stroke)
+	   (ad-activate-regexp "^strokes-") ; advise button2 commands
+	   (setq strokes-mode t))
+	  (t				; turn off strokes
+	   (if (get-buffer strokes-buffer-name)
+	       (kill-buffer (get-buffer strokes-buffer-name)))
+	   (remove-hook 'select-frame-hook
+			'strokes-update-window-configuration)
+	   (if (string-match "^strokes-" (symbol-name (key-binding [(button2)])))
+	       (define-key global-map [(button2)] strokes-click-command))
+	   (if (string-match "^strokes-" (symbol-name (key-binding [(meta button2)])))
+	       (global-unset-key [(meta button2)]))
+	   ;;	   (if (string-match "^strokes-" (symbol-name (key-binding [(shift button2)])))	
+	   ;;	       (global-unset-key [(shift button2)]))
+	   (ad-deactivate-regexp "^strokes-") ; unadvise strokes-button2 commands
+	   (setq strokes-mode nil))))
+  (force-mode-line-update))
+
+(or (assq 'strokes-mode minor-mode-alist)
+(setq minor-mode-alist (cons (list 'strokes-mode strokes-modeline-string)
+			     minor-mode-alist)))
+
+(provide 'strokes)
+(run-hooks 'strokes-load-hook)
+
+;;; strokes.el ends here
+
+