| blob | bd1fcc43d22bafc3a0c513c19a59adefb3e71d1c |
1 ;;; artist.el --- draw ascii graphics with your mouse
3 ;; Copyright (C) 2000-2011 Free Software Foundation, Inc.
5 ;; Author: Tomas Abrahamsson <tab@lysator.liu.se>
6 ;; Maintainer: Tomas Abrahamsson <tab@lysator.liu.se>
7 ;; Keywords: mouse
8 ;; Version: 1.2.6
9 ;; Release-date: 6-Aug-2004
10 ;; Location: http://www.lysator.liu.se/~tab/artist/
12 ;; Yoni Rabkin <yoni@rabkins.net> contacted the maintainer of this
13 ;; file on 19/3/2008, and the maintainer agreed that when a bug is filed in
14 ;; the Emacs bug reporting system against this file, a copy of the bug
15 ;; report be sent to the maintainer's email address.
17 ;; This file is part of GNU Emacs.
19 ;; GNU Emacs is free software: you can redistribute it and/or modify
20 ;; it under the terms of the GNU General Public License as published by
21 ;; the Free Software Foundation, either version 3 of the License, or
22 ;; (at your option) any later version.
24 ;; GNU Emacs is distributed in the hope that it will be useful,
25 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
26 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 ;; GNU General Public License for more details.
29 ;; You should have received a copy of the GNU General Public License
30 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
32 ;;; Commentary:
34 ;; What is artist?
35 ;; ---------------
36 ;;
37 ;; Artist is an Emacs lisp package that allows you to draw lines,
38 ;; rectangles and ellipses by using your mouse and/or keyboard. The
39 ;; shapes are made up with the ascii characters |, -, / and \.
40 ;;
41 ;; Features are:
42 ;;
43 ;; * Intersecting: When a `|' intersects with a `-', a `+' is
44 ;; drawn, like this: | \ /
45 ;; --+-- X
46 ;; | / \
47 ;;
48 ;; * Rubber-banding: When drawing lines you can interactively see the
49 ;; result while holding the mouse button down and moving the mouse. If
50 ;; your machine is not fast enough (a 386 is a bit to slow, but a
51 ;; pentium is well enough), you can turn this feature off. You will
52 ;; then see 1's and 2's which mark the 1st and 2nd endpoint of the line
53 ;; you are drawing.
54 ;;
55 ;; * Drawing operations: The following drawing operations are implemented:
56 ;;
57 ;; lines straight-lines
58 ;; rectangles squares
59 ;; poly-lines straight poly-lines
60 ;; ellipses circles
61 ;; text (see-thru) text (overwrite)
62 ;; spray-can setting size for spraying
63 ;; vaporize line vaporize lines
64 ;; erase characters erase rectangles
65 ;;
66 ;; Straight lines are lines that go horizontally, vertically or
67 ;; diagonally. Plain lines go in any direction. The operations in
68 ;; the right column are accessed by holding down the shift key while
69 ;; drawing.
70 ;;
71 ;; It is possible to vaporize (erase) entire lines and connected lines
72 ;; (rectangles for example) as long as the lines being vaporized are
73 ;; straight and connected at their endpoints. Vaporizing is inspired
74 ;; by the drawrect package by Jari Aalto <jari.aalto@poboxes.com>.
75 ;;
76 ;; * Flood-filling: You can fill any area with a certain character by
77 ;; flood-filling.
78 ;;
79 ;; * Cut copy and paste: You can cut, copy and paste rectangular
80 ;; regions. Artist also interfaces with the rect package (this can be
81 ;; turned off if it causes you any trouble) so anything you cut in
82 ;; artist can be yanked with C-x r y and vice versa.
83 ;;
84 ;; * Drawing with keys: Everything you can do with the mouse, you can
85 ;; also do without the mouse.
86 ;;
87 ;; * Arrows: After having drawn a (straight) line or a (straight)
88 ;; poly-line, you can set arrows on the line-ends by typing < or >.
89 ;;
90 ;; * Aspect-ratio: You can set the variable artist-aspect-ratio to
91 ;; reflect the height-width ratio for the font you are using. Squares
92 ;; and circles are then drawn square/round. Note, that once your
93 ;; ascii-file is shown with font with a different height-width ratio,
94 ;; the squares won't be square and the circles won't be round.
95 ;;
96 ;; * Picture mode compatibility: Artist is picture mode compatible (this
97 ;; can be turned off).
98 ;;
99 ;; See the documentation for the function artist-mode for a detailed
100 ;; description on how to use artist.
101 ;;
102 ;;
103 ;; What about adding my own drawing modes?
104 ;; ---------------------------------------
105 ;;
106 ;; See the short guide at the end of this file.
107 ;; If you add a new drawing mode, send it to me, and I would gladly
108 ;; include in the next release!
110 ;;; Installation:
112 ;; To use artist, put this in your .emacs:
113 ;;
114 ;; (autoload 'artist-mode "artist" "Enter artist-mode" t)
117 ;;; Requirements:
119 ;; Artist requires Emacs 19.28 or higher.
120 ;;
121 ;; Artist requires the `rect' package (which comes with Emacs) to be
122 ;; loadable, unless the variable `artist-interface-with-rect' is set
123 ;; to nil.
124 ;;
125 ;; Artist also requires the Picture mode (which also comes with Emacs)
126 ;; to be loadable, unless the variable `artist-picture-compatibility'
127 ;; is set to nil.
129 ;;; Known bugs:
131 ;; The shifted operations are not available when drawing with the mouse
132 ;; in Emacs 19.29 and 19.30.
133 ;;
134 ;; It is not possible to change between shifted and unshifted operation
135 ;; while drawing with the mouse. (See the comment in the function
136 ;; artist-shift-has-changed for further details.)
139 ;;; ChangeLog:
141 ;; 1.2.6 6-Aug-2004
142 ;; New: Coerced with the artist.el that's in Emacs-21.3.
143 ;; (minor editorial changes)
144 ;;
145 ;; 1.2.5 4-Aug-2004
146 ;; New: Added tool selection via the mouse-wheel
147 ;; Function provided by Andreas Leue <al@sphenon.de>
148 ;;
149 ;; 1.2.4 25-Oct-2001
150 ;; Bugfix: Some operations (the edit menu) got hidden
151 ;; Bugfix: The first arrow for poly-lines was always pointing
152 ;; to the right
153 ;; Changed: Updated with changes made for Emacs 21.1
154 ;;
155 ;; 1.2.3 20-Nov-2000
156 ;; Bugfix: Autoload cookie corrected
157 ;;
158 ;; 1.2.2 19-Nov-2000
159 ;; Changed: More documentation fixes.
160 ;; Bugfix: The arrow characters (`artist-arrows'), which
161 ;; got wrong in 1.1, are now corrected.
162 ;;
163 ;; 1.2.1 15-Nov-2000
164 ;; New: Documentation fixes.
165 ;; Bugfix: Sets next-line-add-newlines to t while in artist-mode.
166 ;; Drawing with keys was confusing without this fix, if
167 ;; next-line-add-newlines was set to nil.
168 ;; Thanks to Tatsuo Furukawa <tatsuo@kobe.hp.com> for this.
169 ;;
170 ;; 1.2 22-Oct-2000
171 ;; New: Updated to work with Emacs 21
172 ;;
173 ;; 1.1 15-Aug-2000
174 ;; Bugfix: Cursor follows mouse pointer more closely.
175 ;; New: Works with Emacs 20.x
176 ;; New: Variables are customizable
177 ;;
178 ;; 1.1-beta1 21-Apr-1998
179 ;; New: Spray-can (Utterly useless, I believe, but it was fun
180 ;; to implement :-) after an idea by Karl-Johan Karlsson
181 ;; <kj@lysator.liu.se>.
182 ;; New: Freehand drawing (with pen).
183 ;; New: Vaporizing lines.
184 ;; New: Text-rendering using figlet.
185 ;; New: Picture mode compatibility.
186 ;; Changed: All Artist keys now uses the prefix C-c C-a not to conflict
187 ;; with Picture mode.
188 ;; Bugfix: No longer leaves traces of lines when rubberbanding
189 ;; if the buffer auto-scrolls.
190 ;; Bugfix: Infinite loop sometimes when rubberbanding was turned
191 ;; off.
192 ;;
193 ;; 1.0 01-Mar-1998
194 ;; First official release.
196 ;;; Code:
198 ;; Variables
205 ;; User options
206 ;; vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
209 "Customization of the Artist mode."
213 "Customization of the text rendering."
217 "Interactively do rubber-banding when non-nil."
222 "Character to set at first point when not rubber-banding."
227 "Character to set at second point when not rubber-banding."
232 "Whether to interface with the rect package or not.
234 Interfacing to the rect package means that the Copy and Paste operations
235 will use the rectangle buffer when accessing the copied area. This means
236 that you can insert a rectangle which is copied using the artist package
237 and vice versa.
239 If this causes any problem for you (for example, if the implementation of
240 the rectangle package changes), you can set this variable to nil, and the
241 artist package will use its own copy buffer."
246 ;; This is a defvar, not a defcustom, since the custom
247 ;; package shows vectors of characters as a vector of integers,
248 ;; which is confusing
249 "A vector of characters to use as arrows.
251 The vector is 8 elements long and contains a character for each
252 direction, or nil if there is no suitable character to use for arrow
253 in that direction.
255 The directions are as follows:
257 5 6 7
259 4 - * - 0
264 "Defines the character height-to-width aspect ratio.
265 This is used when drawing squares and circles."
270 "Whether or not to remove white-space at end of lines.
272 If non-nil, line-endings are trimmed (that is, extraneous white-space
273 at the end of the line is removed) when the shape is drawn."
279 "Right edge definition, used when flood-filling.
281 When flood-filling, if the area is not closed off to the right, then
282 flood-filling will fill no more to the right than specified by this
283 variable. This limit is called the fill-border."
289 "Whether or not to incrementally update display when flood-filling.
291 If non-nil, incrementally update display when flood-filling.
292 If set to non-nil, this currently implies discarding any input events
293 during the flood-fill."
299 "Character to use at the rightmost position when drawing narrow ellipses.
301 In this figure, it is the right parenthesis (the ``)'' character):
302 -----
303 ( )
304 -----"
310 "Character to use at the leftmost position when drawing narrow ellipses.
312 In this figure, it is the left parenthesis (the ``('' character):
313 -----
314 ( )
315 -----"
320 "Whether or not picture mode compatibility is on."
328 "How to vaporize lines that are cut off.
330 Accept this many characters cutting off a line and still treat
331 it as one line.
332 Example:
333 If `artist-vaporize-fuzziness' is 2, then those will be recognized as
334 lines from A to B (provided you start vaporizing them at the ``*''):
335 /
336 A----*------/-----------B
341 but this one won't, since it is cut off by more than 2 characters:
345 (in fact, only the left part [between the A and the leftmost ``/''
346 crossing the line] will be vaporized)."
356 "Function for doing text rendering."
363 "Program to run for `figlet'."
369 "Default font for `figlet'."
375 ;; list files ending with *.flf in any directory printed by the
376 ;; ``figlet -I2'' command. I think this will not produce more than
377 ;; one directory, but it never hurts to be on the safe side...
378 "for dir in `figlet -I2`; do cd $dir; ls *.flf; done"
379 "Command to run to get list of available fonts."
385 "Number of seconds between repeated spraying."
391 "Size of the area for spraying."
397 ;; This is a defvar, not a defcustom, since the custom
398 ;; package shows lists of characters as a lists of integers,
399 ;; which is confusing
400 "*Characters (``color'') to use when spraying.
401 They should be ordered from the ``lightest'' to the ``heaviest''
406 "*Initial character to use when spraying.
407 This character is used if spraying upon a character that is not in
408 `artist-spray-chars'. The character defined by this variable should
412 ;; ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
413 ;; End of user options
416 ;; Internal variables
417 ;;
453 ; This variable is not buffer local
466 "When non-nil, draw shapes without border.
471 "Assoc list for looking up next and/or previous draw operation.
472 The structure is as follows: (OP . (PREV-OP . NEXT-OP))
473 where the elements are as follows:
474 * OP is an atom: the KEY-SYMBOL in the `artist-mt' structure
475 * PREV-OP and NEXT-OP are strings: the KEYWORD in the `artist-mt' structure
480 ;; Make rect available at compile-time
493 ;; Variables that are made local in artist-mode-init
504 \f
511 '(menu-item "Draw Shape Borders" artist-toggle-borderless-shapes
512 :help "Toggle whether shapes are drawn with borders"
513 :button (:toggle . (not artist-borderless-shapes))))
514 (define-key map [trimming]
515 '(menu-item "Trim Line Endings" artist-toggle-trim-line-endings
516 :help "Toggle trimming of line-endings"
517 :button (:toggle . artist-trim-line-endings)))
518 (define-key map [rubber-band]
519 '(menu-item "Rubber-banding" artist-toggle-rubber-banding
520 :help "Toggle rubber-banding"
521 :button (:toggle . artist-rubber-banding)))
522 (define-key map [set-erase]
523 '(menu-item "Character to Erase..." artist-select-erase-char
524 :help "Choose a specific character to erase"))
525 (define-key map [set-line]
526 '(menu-item "Character for Line..." artist-select-line-char
527 :help "Choose the character to insert when drawing lines"))
528 (define-key map [set-fill]
529 '(menu-item "Character for Fill..." artist-select-fill-char
530 :help "Choose the character to insert when filling in shapes"))
531 (define-key map [artist-separator] '(menu-item "--"))
532 (dolist (op '(("Vaporize" artist-select-op-vaporize-lines vaporize-lines)
533 ("Erase" artist-select-op-erase-rectangle erase-rect)
534 ("Spray-can" artist-select-op-spray-set-size spray-get-size)
535 ("Text" artist-select-op-text-overwrite text-ovwrt)
536 ("Ellipse" artist-select-op-circle circle)
537 ("Poly-line" artist-select-op-straight-poly-line spolyline)
538 ("Rectangle" artist-select-op-square square)
539 ("Line" artist-select-op-straight-line s-line)
540 ("Pen" artist-select-op-pen-line pen-line)))
541 (define-key map (vector (nth 2 op))
542 `(menu-item ,(nth 0 op)
543 ,(nth 1 op)
544 :help ,(format "Draw using the %s style" (nth 0 op))
545 :button (:radio . (eq artist-curr-go ',(nth 2 op))))))
546 map))
548 (defvar artist-mode-map
549 (let ((map (make-sparse-keymap)))
550 (setq artist-mode-map (make-sparse-keymap))
551 (define-key map [down-mouse-1] 'artist-down-mouse-1)
552 (define-key map [S-down-mouse-1] 'artist-down-mouse-1)
553 (define-key map [down-mouse-2] 'artist-mouse-choose-operation)
554 (define-key map [S-down-mouse-2] 'artist-mouse-choose-operation)
555 (define-key map [down-mouse-3] 'artist-down-mouse-3)
556 (define-key map [S-down-mouse-3] 'artist-down-mouse-3)
557 (define-key map [C-mouse-4] 'artist-select-prev-op-in-list)
558 (define-key map [C-mouse-5] 'artist-select-next-op-in-list)
560 (define-key map [up] 'artist-previous-line)
561 (define-key map "\C-p" 'artist-previous-line)
562 (define-key map [down] 'artist-next-line)
563 (define-key map "\C-n" 'artist-next-line)
564 (define-key map [left] 'artist-backward-char)
565 (define-key map "\C-b" 'artist-backward-char)
566 (define-key map [right] 'artist-forward-char)
567 (define-key map "\C-f" 'artist-forward-char)
568 (define-key map "<" 'artist-toggle-first-arrow)
569 (define-key map ">" 'artist-toggle-second-arrow)
570 (define-key map "\C-c\C-a\C-e" 'artist-select-erase-char)
571 (define-key map "\C-c\C-a\C-f" 'artist-select-fill-char)
572 (define-key map "\C-c\C-a\C-l" 'artist-select-line-char)
573 (define-key map "\C-c\C-a\C-o" 'artist-select-operation)
574 (define-key map "\C-c\C-a\C-r" 'artist-toggle-rubber-banding)
575 (define-key map "\C-c\C-a\C-t" 'artist-toggle-trim-line-endings)
576 (define-key map "\C-c\C-a\C-s" 'artist-toggle-borderless-shapes)
577 (define-key map "\C-c\C-c" 'artist-mode-off)
578 (define-key map "\C-c\C-al" 'artist-select-op-line)
579 (define-key map "\C-c\C-aL" 'artist-select-op-straight-line)
580 (define-key map "\C-c\C-ar" 'artist-select-op-rectangle)
581 (define-key map "\C-c\C-aR" 'artist-select-op-square)
582 (define-key map "\C-c\C-as" 'artist-select-op-square)
583 (define-key map "\C-c\C-ap" 'artist-select-op-poly-line)
584 (define-key map "\C-c\C-aP" 'artist-select-op-straight-poly-line)
585 (define-key map "\C-c\C-ae" 'artist-select-op-ellipse)
586 (define-key map "\C-c\C-ac" 'artist-select-op-circle)
587 (define-key map "\C-c\C-at" 'artist-select-op-text-see-thru)
588 (define-key map "\C-c\C-aT" 'artist-select-op-text-overwrite)
589 (define-key map "\C-c\C-aS" 'artist-select-op-spray-can)
590 (define-key map "\C-c\C-az" 'artist-select-op-spray-set-size)
591 (define-key map "\C-c\C-a\C-d" 'artist-select-op-erase-char)
592 (define-key map "\C-c\C-aE" 'artist-select-op-erase-rectangle)
593 (define-key map "\C-c\C-av" 'artist-select-op-vaporize-line)
594 (define-key map "\C-c\C-aV" 'artist-select-op-vaporize-lines)
595 (define-key map "\C-c\C-a\C-k" 'artist-select-op-cut-rectangle)
596 (define-key map "\C-c\C-a\M-w" 'artist-select-op-copy-rectangle)
597 (define-key map "\C-c\C-a\C-y" 'artist-select-op-paste)
598 (define-key map "\C-c\C-af" 'artist-select-op-flood-fill)
599 (define-key map "\C-c\C-a\C-b" 'artist-submit-bug-report)
600 (define-key map [menu-bar artist] (cons "Artist" artist-menu-map))
601 map)
602 "Keymap for `artist-minor-mode'.")
604 (defvar artist-replacement-table (make-vector 256 0)
605 "Replacement table for `artist-replace-char'.")
608 ;;;
609 ;;; The table of graphic operations
610 ;;;
611 (defvar artist-mt
612 ;; Implementation note: Maybe this should be done using a structure
613 ;; in the cl package?
614 ;;
615 '(
616 (menu
617 ("Drawing"
618 ((function-call
619 ( "Undo" do-undo undo))
621 (separator )
622 (graphics-operation
623 ("Pen" (("Pen" pen-char "pen-c"
624 artist-no-arrows nil
625 nil nil nil
626 artist-do-continously
627 artist-pen
628 (nil))
629 ("Pen Line" pen-line "pen-l"
630 artist-arrows artist-pen-set-arrow-points
631 artist-pen-reset-last-xy nil nil
632 artist-do-continously
633 artist-pen-line
634 (nil)))))
636 (graphics-operation
637 ("Line" (("line" line "line"
638 artist-arrows artist-set-arrow-points-for-2points
639 nil nil nil
640 2
641 artist-draw-line
642 (artist-undraw-line
643 artist-nil nil))
644 ("straight line" s-line "sline"
645 artist-arrows artist-set-arrow-points-for-2points
646 nil nil nil
647 2
648 artist-draw-sline
649 (artist-undraw-sline
650 artist-nil nil)))))
652 (graphics-operation
653 ("Rectangle" (("rectangle" rect "rect"
654 artist-no-arrows nil
655 nil nil nil
656 2
657 artist-draw-rect
658 (artist-undraw-rect
659 artist-t-if-fill-char-set artist-fill-rect))
660 ("square" square "square"
661 artist-no-arrows nil
662 nil nil nil
663 2
664 artist-draw-square
665 (artist-undraw-square
666 artist-t-if-fill-char-set artist-fill-square)))))
668 (graphics-operation
669 ("Poly-line" (("poly-line" polyline "poly"
670 artist-arrows artist-set-arrow-points-for-poly
671 nil nil nil
672 artist-do-poly
673 artist-draw-line
674 (artist-undraw-line
675 artist-nil nil))
676 ("straight poly-line" spolyline "s-poly"
677 artist-arrows artist-set-arrow-points-for-poly
678 nil nil nil
679 artist-do-poly
680 artist-draw-sline
681 (artist-undraw-sline
682 artist-nil nil)))))
684 (graphics-operation
685 ("Ellipse" (("ellipse" ellipse "ellipse"
686 artist-no-arrows nil
687 nil nil nil
688 2
689 artist-draw-ellipse
690 (artist-undraw-ellipse
691 artist-t-if-fill-char-set artist-fill-ellipse))
692 ("circle" circle "circle"
693 artist-no-arrows nil
694 nil nil nil
695 2
696 artist-draw-circle
697 (artist-undraw-circle
698 artist-t-if-fill-char-set artist-fill-circle)))))
700 (graphics-operation
701 ("Text" (("text see-thru" text-thru "text-thru"
702 artist-no-arrows nil
703 nil nil nil
704 1
705 artist-text-see-thru
706 nil)
707 ("text overwrite" text-ovwrt "text-ovwrt"
708 artist-no-arrows nil
709 nil nil nil
710 1
711 artist-text-overwrite
712 nil))))
714 (graphics-operation
715 ("Spray-can" (("spray-can" spray-can "spray-can"
716 artist-no-arrows nil
717 nil nil nil
718 artist-do-continously
719 artist-spray
720 (artist-spray-get-interval))
721 ("spray set size" spray-get-size "spray-size"
722 artist-no-arrows nil
723 nil artist-spray-clear-circle artist-spray-set-radius
724 2
725 artist-draw-circle
726 (artist-undraw-circle
727 artist-nil nil)))))
729 (graphics-operation
730 ("Erase" (("erase char" erase-char "erase-c"
731 artist-no-arrows nil
732 nil nil nil
733 artist-do-continously
734 artist-erase-char
735 (nil))
736 ("erase rectangle" erase-rect "erase-r"
737 artist-no-arrows nil
738 nil nil nil
739 2
740 artist-draw-rect
741 (artist-undraw-rect
742 artist-t artist-erase-rect)))))
744 (graphics-operation
745 ("Vaporize" (("vaporize line" vaporize-line "vaporize-1"
746 artist-no-arrows nil
747 nil nil nil
748 1
749 artist-vaporize-line
750 nil)
751 ("vaporize lines" vaporize-lines "vaporize-n"
752 artist-no-arrows nil
753 nil nil nil
754 1
755 artist-vaporize-lines
756 nil)))))))
758 (menu
759 ("Edit"
760 ((graphics-operation
761 ("Cut" (("cut rectangle" cut-r "cut-r"
762 artist-no-arrows nil
763 nil nil nil
764 2
765 artist-draw-rect
766 (artist-undraw-rect
767 artist-t artist-cut-rect))
768 ("cut square" cut-s "cut-s"
769 artist-no-arrows nil
770 nil nil nil
771 2
772 artist-draw-square
773 (artist-undraw-square
774 artist-t artist-cut-square)))))
776 (graphics-operation
777 ("Copy" (("copy rectangle" copy-r "copy-r"
778 artist-no-arrows nil
779 nil nil nil
780 2
781 artist-draw-rect
782 (artist-undraw-rect
783 artist-t artist-copy-rect))
784 ("copy square" copy-s "copy-s"
785 artist-no-arrows nil
786 nil nil nil
787 2
788 artist-draw-square
789 (artist-undraw-square
790 artist-t artist-copy-square)))))
792 (graphics-operation
793 ("Paste" (("paste" paste "paste"
794 artist-no-arrows nil
795 nil nil nil
796 1
797 artist-paste
798 nil)
799 ("paste" paste "paste"
800 artist-no-arrows nil
801 nil nil nil
802 1
803 artist-paste
804 nil))))
806 (graphics-operation
807 ("Flood-fill" (("flood-fill" flood-fill "flood"
808 artist-no-arrows nil
809 nil nil nil
810 1
811 artist-flood-fill
812 nil)
813 ("flood-fill" flood-fill "flood"
814 artist-no-arrows nil
815 nil nil nil
816 1
817 artist-flood-fill
818 nil)))))))
820 (menu
821 ("Settings"
822 ((function-call
823 ("Set Fill" set-fill artist-select-fill-char))
825 (function-call
826 ("Set Line" set-line artist-select-line-char))
828 (function-call
829 ("Set Erase" set-erase artist-select-erase-char))
831 (function-call
832 ("Rubber-banding" rubber-band artist-toggle-rubber-banding))
834 (function-call
835 ("Trimming" trimming artist-toggle-trim-line-endings))
837 (function-call
838 ("Borders" borders artist-toggle-borderless-shapes))
840 (function-call
841 ("Spray-chars" spray-chars artist-select-spray-chars)))))
843 ) ;; end of list
845 "Master Table for `artist-mode'.
846 This table is primarily a table over the different graphics operations
847 available in Artist mode, but it also holds layout information for the
848 popup menu.
850 The master table is a list of table elements. The elements of this table
851 have the layout
853 (TAG INFO-PART)
855 There are three kinds of TAG:
857 `menu' -- a sub-menu
858 `separator' -- produce a separator in the popup menu
859 `function-call' -- call a function
860 `graphics-operation' -- a graphics operation
862 The layout of the INFO-PART for `menu' is
864 (TITLE ((TAG-1 INFO-PART-1) (TAG-2 INFO-PART-2) ...))
866 TITLE is the title of the submenu; this is followed by a list of
867 menu items, each on the general form (TAG INFO-PART).
870 The layout of the INFO-PART for `separator' is empty and not used.
873 This is the layout of the INFO-PART for `function-call':
875 (KEYWORD SYMBOL FN)
877 KEYWORD is a string naming the operation, and appears in the popup menu.
878 SYMBOL is the symbol for the operations.
879 FN is the function performing the operation. This function
880 is called with no arguments. Its return value is ignored.
883 The layout of the INFO-PART for `graphics-operation' is
885 (TITLE (UNSHIFTED SHIFTED))
887 TITLE is the title that appears in the popup menu. UNSHIFTED
888 and SHIFTED specify for unshifted and shifted operation. Both
889 have the form
891 (KEYWORD KEY-SYMBOL MODE-LINE ARROW-PRED ARROW-SET-FN
892 INIT-FN PREP-FILL-FN EXIT-FN DRAW-HOW DRAW-FN EXTRA-DRAW-INFO)
894 KEYWORD is a string specifying the name of the shape to draw.
895 This is used when selecting drawing operation.
896 KEY-SYMBOL is the key which is used when looking up members
897 through the functions `artist-go-get-MEMBER-from-symbol'
898 and `artist-fc-get-MEMBER-from-symbol'.
899 MODE-LINE is a string that appears in the mode-line when drawing
900 the shape.
901 ARROW-PRED is a function that is called to find out if the shape
902 can have arrows. The function is called with no arguments and
903 must return nil or t.
904 ARROW-SET-FN is a function that is called to set arrow end-points.
905 Arguments and return values for this function are described below.
906 INIT-FN is, if non-nil, a function that is called when the first
907 point of the shape is set. Arguments and return values for
908 this function are described below.
909 PREP-FILL-FN is, if non-nil, a function that is called after
910 the last point is set, but before the filling is done.
911 Arguments and return values for this function are described below.
912 EXIT-FN is, if non-nil, a function that is called after filling
913 is done. Arguments and return values for this function are
914 described below.
915 DRAW-HOW defines the kind of shape. The kinds of shapes are:
916 `artist-do-continously' -- Do drawing operation continuously,
917 as long as the mouse button is held down.
918 `artist-do-poly' -- Do drawing operation many times.
919 1 -- Do drawing operation only once.
920 2 -- The drawing operation requires two points.
921 DRAW-FN is the function to call for drawing. Arguments and
922 return values for this function are described below.
923 EXTRA-DRAW-INFO the layout of this depends on the value of DRAW-HOW:
924 If DRAW-HOW is `artist-do-continously':
926 (INTERVAL-FN)
928 INTERVAL-FN is, if non-nil, a function to call for getting
929 an interval between repeated calls to the DRAW-FN.
930 This function is called with no arguments and must
931 return a number, the interval in seconds.
932 If nil, calls to DRAW-FN are done only when the mouse
933 or cursor is moved.
935 If DRAW-HOW is either `artist-do-poly' or 2:
937 (UNDRAW-FN FILL-PRED FILL-FN)
939 UNDRAW-FN is a function to call for undrawing the shape.
940 Arguments and return values for this function are
941 described below.
942 FILL-PRED is a function that is called to find out if the shape
943 can have arrows. The function must take no arguments and
944 return nil or t.
945 FILL-FN is a function to call for filling the shape.
946 Arguments and return values for this function are
947 described below.
949 If DRAW-HOW is 1:
951 ()
953 Note! All symbols and keywords (both in the `function-call' INFO-PART
954 as well as in the `graphics-operation' INFO-PART) must be unique.
956 The following table describe function arguments and return value
957 for different functions and DRAW-HOWs.
959 If DRAW-HOW is either `artist-do-continously' or 1:
961 INIT-FN X Y ==> ignored
962 PREP-FILL-FN X Y ==> ignored
963 EXIT-FN X Y ==> ignored
964 ARROW-SET-FN X Y ==> ignored
965 DRAW-FN X Y ==> ignored
967 If DRAW-HOW is 2:
969 INIT-FN X1 Y1 ==> ignored
970 PREP-FILL-FN X1 Y1 X2 Y2 ==> ignored
971 EXIT-FN X1 Y1 X2 Y2 ==> ignored
972 ARROW-SET-FN X1 Y1 X2 Y2 ==> ignored
973 DRAW-FN X1 Y1 X2 Y2 ==> (ENDPOINT-1 ENDPOINT-2 SHAPE)
974 UNDRAW-FN (ENDPOINT-1 ENDPOINT-2 SHAPE) ==> ignored
975 FILL-FN (ENDPOINT-1 ENDPOINT-2 SHAPE) X1 Y1 X2 Y2 ==> ignored
977 ENDPOINT-1 and ENDPOINT-2 are endpoints which are created with
978 `artist-make-endpoint'
979 SHAPE is an opaque structure, created by the DRAW-FN and intended
980 to be used only by the UNDRAW-FN.
982 If DRAW-HOW is `artist-do-poly':
984 INIT-FN X1 Y1
985 PREP-FILL-FN POINT-LIST
986 ARROW-SET-FN POINT-LIST
987 EXIT-FN POINT-LIST
988 DRAW-FN X-LAST Y-LAST X-NEW Y-NEW ==> (ENDPOINT-1 ENDPOINT-2 SHAPE)
989 UNDRAW-FN (ENDPOINT-1 ENDPOINT-2 SHAPE)
990 FILL-FN POINT-LIST
992 ENDPOINT-1 and ENDPOINT-2 are endpoints which are created with
993 `artist-make-endpoint'.
994 SHAPE is an opaque structure, created by the DRAW-FN and intended
995 to be used only by the UNDRAW-FN.
996 POINT-LIST is a list of vectors [X Y].")
999 ;;
1000 ;; Accessors for the master table
1001 ;;
1003 (defun artist-mt-get-tag (element)
1004 "Retrieve the tag component from the master table ELEMENT."
1005 (elt element 0))
1007 (defun artist-mt-get-info-part (element)
1008 "Retrieve the info part component from the master table ELEMENT."
1009 (elt element 1))
1011 ;; For the 'graphics-operation info-parts
1012 ;;
1013 (defsubst artist-go-get-desc (info-part)
1014 "Retrieve the description component from a graphics operation INFO-PART."
1015 (elt info-part 0))
1017 (defsubst artist-go-get-unshifted (info-part)
1018 "Retrieve the unshifted info from a graphics operation INFO-PART."
1019 (elt (elt info-part 1) 0))
1021 (defsubst artist-go-get-shifted (info-part)
1022 "Retrieve the shifted info from a graphics operation INFO-PART."
1023 (elt (elt info-part 1) 1))
1025 (defsubst artist-go-get-keyword (info-variant-part)
1026 "Retrieve the keyword component from an INFO-VARIANT-PART.
1027 An INFO-VARIANT-PART is the shifted or unshifted info from a info-part."
1028 (elt info-variant-part 0))
1030 (defsubst artist-go-get-symbol (info-variant-part)
1031 "Retrieve the symbol component from an INFO-VARIANT-PART.
1032 An INFO-VARIANT-PART is the shifted or unshifted info from a info-part."
1033 (elt info-variant-part 1))
1035 (defsubst artist-go-get-mode-line (info-variant-part)
1036 "Retrieve the mode line component from an INFO-VARIANT-PART.
1037 An INFO-VARIANT-PART is the shifted or unshifted info from a info-part."
1038 (elt info-variant-part 2))
1040 (defsubst artist-go-get-arrow-pred (info-variant-part)
1041 "Retrieve the arrow predicate component from an INFO-VARIANT-PART.
1042 An INFO-VARIANT-PART is the shifted or unshifted info from a info-part."
1043 (elt info-variant-part 3))
1045 (defsubst artist-go-get-arrow-set-fn (info-variant-part)
1046 "Retrieve the arrow set component from an INFO-VARIANT-PART.
1047 An INFO-VARIANT-PART is the shifted or unshifted info from a info-part."
1048 (elt info-variant-part 4))
1050 (defsubst artist-go-get-init-fn (info-variant-part)
1051 "Retrieve the init function component from an INFO-VARIANT-PART.
1052 An INFO-VARIANT-PART is the shifted or unshifted info from a info-part."
1053 (elt info-variant-part 5))
1055 (defsubst artist-go-get-prep-fill-fn (info-variant-part)
1056 "Retrieve the fill preparation function component from an INFO-VARIANT-PART.
1057 An INFO-VARIANT-PART is the shifted or unshifted info from a info-part."
1058 (elt info-variant-part 6))
1060 (defsubst artist-go-get-exit-fn (info-variant-part)
1061 "Retrieve the exit component from an INFO-VARIANT-PART.
1062 An INFO-VARIANT-PART is the shifted or unshifted info from a info-part."
1063 (elt info-variant-part 7))
1065 (defsubst artist-go-get-draw-how (info-variant-part)
1066 "Retrieve the draw how component from an INFO-VARIANT-PART.
1067 An INFO-VARIANT-PART is the shifted or unshifted info from a info-part."
1068 (elt info-variant-part 8))
1070 (defsubst artist-go-get-draw-fn (info-variant-part)
1071 "Retrieve the draw function component from an INFO-VARIANT-PART.
1072 An INFO-VARIANT-PART is the shifted or unshifted info from a info-part."
1073 (elt info-variant-part 9))
1075 (defsubst artist-go-get-undraw-fn (info-variant-part)
1076 "Retrieve the undraw function component from an INFO-VARIANT-PART.
1077 An INFO-VARIANT-PART is the shifted or unshifted info from a info-part.
1078 This interval function component is available only if the `draw-how'
1079 component is other than `artist-do-continously' or 1."
1080 (elt (elt info-variant-part 10) 0))
1082 (defsubst artist-go-get-interval-fn (info-variant-part)
1083 "Retrieve the interval function component from an INFO-VARIANT-PART.
1084 An INFO-VARIANT-PART is the shifted or unshifted info from a info-part.
1085 This interval function component is available only if the `draw-how'
1086 component is `artist-do-continously'."
1087 (elt (elt info-variant-part 10) 0))
1089 (defsubst artist-go-get-fill-pred (info-variant-part)
1090 "Retrieve the fill predicate component from an INFO-VARIANT-PART.
1091 An INFO-VARIANT-PART is the shifted or unshifted info from a info-part.
1092 This interval function component is available only if the `draw-how'
1093 component is other than `artist-do-continously' or 1."
1094 (elt (elt info-variant-part 10) 1))
1096 (defsubst artist-go-get-fill-fn (info-variant-part)
1097 "Retrieve the fill function component from an INFO-VARIANT-PART.
1098 An INFO-VARIANT-PART is the shifted or unshifted info from a info-part.
1099 This interval function component is available only if the `draw-how'
1100 component is other than `artist-do-continously' or 1."
1101 (elt (elt info-variant-part 10) 2))
1103 ;; For the 'function-call info-parts
1104 ;;
1105 (defsubst artist-fc-get-keyword (info-part)
1106 "Retrieve the keyword component from a graphics operation INFO-PART."
1107 (elt info-part 0))
1109 (defsubst artist-fc-get-symbol (info-part)
1110 "Retrieve the symbol component from a graphics operation INFO-PART."
1111 (elt info-part 1))
1113 (defsubst artist-fc-get-fn (info-part)
1114 "Retrieve the function component from a graphics operation INFO-PART."
1115 (elt info-part 2))
1117 ;; For the 'menu info-parts
1118 ;;
1119 (defsubst artist-mn-get-title (info-part)
1120 "Retrieve the title component from a graphics operation INFO-PART."
1121 (elt info-part 0))
1123 (defsubst artist-mn-get-items (info-part)
1124 "Retrieve the items component from a graphics operation INFO-PART."
1125 (elt info-part 1))
1127 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1128 ;; mouse wheel cyclic operation selection
1130 (defun artist-get-last-non-nil-op (op-list &optional last-non-nil)
1131 "Find the last non-nil draw operation in OP-LIST.
1132 Optional LAST-NON-NIL will be returned if OP-LIST is nil."
1133 (if op-list
1134 (artist-get-last-non-nil-op (cdr op-list)
1135 (or (car (car op-list)) last-non-nil))
1136 last-non-nil))
1138 (defun artist-get-first-non-nil-op (op-list)
1139 "Find the first non-nil draw operation in OP-LIST."
1140 (or (car (car op-list)) (artist-get-first-non-nil-op (cdr op-list))))
1142 (defun artist-is-in-op-list-p (op op-list)
1143 "Check whether OP is in OP-LIST."
1144 (and op-list
1145 (or (and (car (car op-list)) (string= op (car (car op-list))))
1146 (artist-is-in-op-list-p op (cdr op-list)))))
1148 (defun artist-make-prev-next-op-alist (op-list
1149 &optional
1150 last-non-nil-arg first-non-nil-arg
1151 prev-entry prev-op-arg)
1152 "Build an assoc-list of OP-LIST.
1153 The arguments LAST-NON-NIL-ARG, FIRST-NON-NIL-ARG, PREV-ENTRY and
1154 PREV-OP-ARG are used when invoked recursively during the build-up."
1155 (let* ((last-non-nil (or last-non-nil-arg
1156 (artist-get-last-non-nil-op
1157 artist-key-compl-table)))
1158 (first-non-nil (or first-non-nil-arg
1159 (artist-get-first-non-nil-op
1160 artist-key-compl-table)))
1161 (prev-op (or prev-op-arg last-non-nil))
1162 (op (car (car op-list)))
1163 (opsym (artist-mt-get-symbol-from-keyword op))
1164 (entry (cons opsym (cons prev-op nil))))
1165 (if (or (and op-list (not op))
1166 (artist-is-in-op-list-p op (cdr op-list)))
1167 (artist-make-prev-next-op-alist (cdr op-list)
1168 last-non-nil first-non-nil
1169 prev-entry prev-op)
1170 (if prev-entry (setcdr (cdr prev-entry) op))
1171 (if op-list
1172 (cons entry (artist-make-prev-next-op-alist
1173 (cdr op-list)
1174 last-non-nil first-non-nil
1175 entry op))
1176 (progn (setcdr (cdr prev-entry) first-non-nil) nil)))))
1178 (defun artist-select-next-op-in-list ()
1179 "Cyclically select next drawing mode operation."
1180 (interactive)
1181 (let ((next-op (cdr (cdr (assoc artist-curr-go artist-prev-next-op-alist)))))
1182 (artist-select-operation next-op)
1183 (message "%s" next-op)))
1185 (defun artist-select-prev-op-in-list ()
1186 "Cyclically select previous drawing mode operation."
1187 (interactive)
1188 (let ((prev-op (car (cdr (assoc artist-curr-go artist-prev-next-op-alist)))))
1189 (artist-select-operation prev-op)
1190 (message "%s" prev-op)))
1192 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1194 ;;; ---------------------------------
1195 ;;; The artist-mode
1196 ;;; ---------------------------------
1198 ;;;###autoload
1199 (defun artist-mode (&optional state)
1200 "Toggle Artist mode.
1201 With argument STATE, turn Artist mode on if STATE is positive.
1202 Artist lets you draw lines, squares, rectangles and poly-lines,
1203 ellipses and circles with your mouse and/or keyboard.
1205 How to quit Artist mode
1210 How to submit a bug report
1215 Drawing with the mouse:
1217 mouse-2
1218 shift mouse-2 Pops up a menu where you can select what to draw with
1219 mouse-1, and where you can do some settings (described
1220 below).
1222 mouse-1
1223 shift mouse-1 Draws lines, rectangles or poly-lines, erases, cuts, copies
1224 or pastes:
1226 Operation Not shifted Shifted
1227 --------------------------------------------------------------
1228 Pen fill-char at point line from last point
1229 to new point
1230 --------------------------------------------------------------
1231 Line Line in any direction Straight line
1232 --------------------------------------------------------------
1233 Rectangle Rectangle Square
1234 --------------------------------------------------------------
1235 Poly-line Poly-line in any dir Straight poly-lines
1236 --------------------------------------------------------------
1237 Ellipses Ellipses Circles
1238 --------------------------------------------------------------
1239 Text Text (see thru) Text (overwrite)
1240 --------------------------------------------------------------
1241 Spray-can Spray-can Set size for spray
1242 --------------------------------------------------------------
1243 Erase Erase character Erase rectangle
1244 --------------------------------------------------------------
1245 Vaporize Erase single line Erase connected
1246 lines
1247 --------------------------------------------------------------
1248 Cut Cut rectangle Cut square
1249 --------------------------------------------------------------
1250 Copy Copy rectangle Copy square
1251 --------------------------------------------------------------
1252 Paste Paste Paste
1253 --------------------------------------------------------------
1254 Flood-fill Flood-fill Flood-fill
1255 --------------------------------------------------------------
1257 * Straight lines can only go horizontally, vertically
1258 or diagonally.
1260 * Poly-lines are drawn while holding mouse-1 down. When you
1261 release the button, the point is set. If you want a segment
1262 to be straight, hold down shift before pressing the
1263 mouse-1 button. Click mouse-2 or mouse-3 to stop drawing
1264 poly-lines.
1266 * See thru for text means that text already in the buffer
1267 will be visible through blanks in the text rendered, while
1268 overwrite means the opposite.
1270 * Vaporizing connected lines only vaporizes lines whose
1271 _endpoints_ are connected. See also the variable
1272 `artist-vaporize-fuzziness'.
1274 * Cut copies, then clears the rectangle/square.
1276 * When drawing lines or poly-lines, you can set arrows.
1277 See below under ``Arrows'' for more info.
1279 * The mode line shows the currently selected drawing operation.
1280 In addition, if it has an asterisk (*) at the end, you
1281 are currently drawing something.
1283 * Be patient when flood-filling -- large areas take quite
1284 some time to fill.
1287 mouse-3 Erases character under pointer
1288 shift mouse-3 Erases rectangle
1291 Settings
1293 Set fill Sets the character used when filling rectangles/squares
1295 Set line Sets the character used when drawing lines
1297 Erase char Sets the character used when erasing
1299 Rubber-banding Toggles rubber-banding
1301 Trimming Toggles trimming of line-endings (that is: when the shape
1302 is drawn, extraneous white-space at end of lines is removed)
1304 Borders Toggles the drawing of line borders around filled shapes
1307 Drawing with keys
1310 For lines/rectangles/squares: sets the first/second endpoint
1312 When erase characters: toggles erasing
1313 When cutting/copying: Sets first/last endpoint of rect/square
1314 When pasting: Pastes
1318 Move around with \\[artist-next-line], \\[artist-previous-line], \\[artist-forward-char] and \\[artist-backward-char].
1328 Arrows
1331 of the line/poly-line
1334 of the line/poly-line
1337 Selecting operation
1339 There are some keys for quickly selecting drawing operations:
1363 Variables
1365 This is a brief overview of the different variables. For more info,
1368 artist-rubber-banding Interactively do rubber-banding or not
1369 artist-first-char What to set at first/second point...
1370 artist-second-char ...when not rubber-banding
1371 artist-interface-with-rect If cut/copy/paste should interface with rect
1372 artist-arrows The arrows to use when drawing arrows
1373 artist-aspect-ratio Character height-to-width for squares
1374 artist-trim-line-endings Trimming of line endings
1375 artist-flood-fill-right-border Right border when flood-filling
1376 artist-flood-fill-show-incrementally Update display while filling
1377 artist-pointer-shape Pointer shape to use while drawing
1378 artist-ellipse-left-char Character to use for narrow ellipses
1379 artist-ellipse-right-char Character to use for narrow ellipses
1380 artist-borderless-shapes If shapes should have borders
1381 artist-picture-compatibility Whether or not to be picture mode compatible
1382 artist-vaporize-fuzziness Tolerance when recognizing lines
1383 artist-spray-interval Seconds between repeated sprayings
1384 artist-spray-radius Size of the spray-area
1385 artist-spray-chars The spray-``color''
1386 artist-spray-new-chars Initial spray-``color''
1388 Hooks
1390 When entering artist-mode, the hook `artist-mode-init-hook' is called.
1391 When quitting artist-mode, the hook `artist-mode-exit-hook' is called.
1394 Keymap summary
1397 (interactive)
1398 (if (setq artist-mode
1399 (if (null state) (not artist-mode)
1400 (> (prefix-numeric-value state) 0)))
1401 (artist-mode-init)
1402 (artist-mode-exit)))
1404 ;; insert our minor mode string
1405 (or (assq 'artist-mode minor-mode-alist)
1406 (setq minor-mode-alist
1407 (cons '(artist-mode artist-mode-name)
1408 minor-mode-alist)))
1410 ;; insert our minor mode keymap
1411 (or (assq 'artist-mode minor-mode-map-alist)
1412 (setq minor-mode-map-alist
1413 (cons (cons 'artist-mode artist-mode-map)
1414 minor-mode-map-alist)))
1417 ;; Init and exit
1418 (defun artist-mode-init ()
1419 "Init Artist mode. This will call the hook `artist-mode-init-hook'."
1420 ;; Set up a conversion table for mapping tabs and new-lines to spaces.
1421 ;; the last case, 0, is for the last position in buffer/region, where
1422 ;; the `following-char' function returns 0.
1423 (let ((i 0))
1424 (while (< i 256)
1425 (aset artist-replacement-table i i)
1426 (setq i (1+ i))))
1429 (aset artist-replacement-table 0 ?\s)
1430 ;; More setup
1431 (make-local-variable 'artist-key-is-drawing)
1432 (make-local-variable 'artist-key-endpoint1)
1433 (make-local-variable 'artist-key-poly-point-list)
1434 (make-local-variable 'artist-key-shape)
1435 (make-local-variable 'artist-key-draw-how)
1436 (make-local-variable 'artist-popup-menu-table)
1437 (make-local-variable 'artist-key-compl-table)
1438 (make-local-variable 'artist-prev-next-op-alist)
1439 (make-local-variable 'artist-rb-save-data)
1440 (make-local-variable 'artist-arrow-point-1)
1441 (make-local-variable 'artist-arrow-point-2)
1442 (setq artist-key-is-drawing nil)
1443 (setq artist-key-endpoint1 nil)
1444 (setq artist-key-poly-point-list nil)
1445 (setq artist-key-shape nil)
1446 (setq artist-popup-menu-table (artist-compute-popup-menu-table artist-mt))
1447 (setq artist-key-compl-table (artist-compute-key-compl-table artist-mt))
1448 (setq artist-prev-next-op-alist
1449 (artist-make-prev-next-op-alist artist-key-compl-table))
1450 (setq artist-rb-save-data (make-vector 7 0))
1451 (setq artist-arrow-point-1 nil)
1452 (setq artist-arrow-point-2 nil)
1453 (make-local-variable 'next-line-add-newlines)
1454 (setq next-line-add-newlines t)
1455 (setq artist-key-draw-how
1456 (artist-go-get-draw-how-from-symbol artist-curr-go))
1457 (if (and artist-picture-compatibility (not (eq major-mode 'picture-mode)))
1458 (progn
1459 (picture-mode)
1460 (message "")))
1461 (run-hooks 'artist-mode-init-hook)
1462 (artist-mode-line-show-curr-operation artist-key-is-drawing))
1464 (defun artist-mode-exit ()
1465 "Exit Artist mode. This will call the hook `artist-mode-exit-hook'."
1466 (if (and artist-picture-compatibility (eq major-mode 'picture-mode))
1467 (picture-mode-exit))
1468 (kill-local-variable 'next-line-add-newlines)
1469 (run-hooks 'artist-mode-exit-hook))
1471 (defun artist-mode-off ()
1472 "Turn Artist mode off."
1473 (interactive)
1474 (artist-mode -1)
1475 (force-mode-line-update))
1477 ;;
1478 ;; General routines
1479 ;;
1481 (defun artist-update-display ()
1482 "Repaint the display."
1483 (sit-for 0))
1485 (defun artist-mode-line-show-curr-operation (is-drawing)
1486 "Show current operation in mode-line. If IS-DRAWING, show that."
1487 (let ((mtext (concat artist-mode-name "/"
1488 (artist-go-get-mode-line-from-symbol artist-curr-go)
1489 (if is-drawing "/*" ""))))
1490 (setcdr (assq 'artist-mode minor-mode-alist) (list mtext)))
1491 (force-mode-line-update))
1494 (defun artist-t-if-fill-char-set ()
1495 "Return the value of the variable `artist-fill-char-set'."
1496 artist-fill-char-set)
1498 (defun artist-t ()
1499 "Always return t."
1500 t)
1502 (defun artist-nil ()
1503 "Always return nil."
1504 nil)
1506 (defun artist-arrows ()
1507 "Say yes to arrows!"
1508 t)
1510 (defun artist-no-arrows ()
1511 "Say no to arrows!"
1512 nil)
1514 ;;
1515 ;; Auxiliary init-routines
1516 ;;
1518 ;
1519 ; Computing the table for the x-popup-menu from the master table
1520 ;
1522 (defun artist-compute-popup-menu-table (menu-table)
1523 "Create a menu from MENU-TABLE data.
1524 The returned value is suitable for the `x-popup-menu' function."
1525 (cons "Artist menu"
1526 (artist-compute-popup-menu-table-sub menu-table)))
1528 (defun artist-compute-popup-menu-table-sub (menu-table)
1529 "Compute operation table suitable for `x-popup-menu' from MENU-TABLE."
1530 (mapcar
1531 (lambda (element)
1532 (let ((element-tag (artist-mt-get-tag element)))
1533 (cond ((eq element-tag 'graphics-operation)
1534 (let* ((info-part (artist-mt-get-info-part element))
1535 (descr (artist-go-get-desc info-part))
1536 (unshifted (artist-go-get-unshifted info-part))
1537 (symbol (artist-go-get-symbol unshifted)))
1538 (list descr symbol)))
1540 ((eq element-tag 'function-call)
1541 (let* ((info-part (artist-mt-get-info-part element))
1542 (keyword (artist-fc-get-keyword info-part))
1543 (symbol (artist-fc-get-symbol info-part)))
1544 (list keyword symbol)))
1546 ((eq element-tag 'separator)
1547 '("" ""))
1549 ((eq element-tag 'menu)
1550 (let* ((info-part (artist-mt-get-info-part element))
1551 (title (artist-mn-get-title info-part))
1552 (items (artist-mn-get-items info-part)))
1553 (cons title (artist-compute-popup-menu-table-sub items))))
1555 (t
1557 element-tag)))))
1558 menu-table))
1560 ;
1561 ; Computing the completion table from the master table
1562 ;
1564 (defun artist-compute-key-compl-table (menu-table)
1565 "Compute completion table from MENU-TABLE, suitable for `completing-read'."
1566 (apply
1567 'nconc
1568 (remq nil
1569 (mapcar
1570 (lambda (element)
1571 (let ((element-tag (artist-mt-get-tag element)))
1572 (cond ((eq element-tag 'graphics-operation)
1573 (let* ((info-part (artist-mt-get-info-part element))
1574 (unshifted (artist-go-get-unshifted info-part))
1575 (shifted (artist-go-get-shifted info-part))
1576 (unshifted-kwd (artist-go-get-keyword unshifted))
1577 (shifted-kwd (artist-go-get-keyword shifted)))
1578 (list (list unshifted-kwd) (list shifted-kwd))))
1579 ((eq element-tag 'menu)
1580 (let* ((info-part (artist-mt-get-info-part element))
1581 (items (artist-mn-get-items info-part)))
1582 (artist-compute-key-compl-table items)))
1583 (t
1584 nil))))
1585 menu-table))))
1588 ;
1589 ; Retrieving a symbol (graphics operation or function-call) from a keyword
1590 ;
1592 (defun artist-mt-get-symbol-from-keyword (kwd)
1593 "Search master table for keyword KWD and return its symbol."
1594 (artist-mt-get-symbol-from-keyword-sub artist-mt kwd))
1596 (defun artist-mt-get-symbol-from-keyword-sub (table kwd)
1597 "Search TABLE for keyword KWD and return its symbol."
1598 (catch 'found
1599 (mapc
1600 (lambda (element)
1601 (let ((element-tag (artist-mt-get-tag element)))
1602 (cond ((eq element-tag 'graphics-operation)
1603 (let* ((info-part (artist-mt-get-info-part element))
1604 (unshifted (artist-go-get-unshifted info-part))
1605 (shifted (artist-go-get-shifted info-part))
1606 (unshifted-kwd (artist-go-get-keyword unshifted))
1607 (shifted-kwd (artist-go-get-keyword shifted))
1608 (unshifted-sym (artist-go-get-symbol unshifted))
1609 (shifted-sym (artist-go-get-symbol shifted)))
1610 (if (string-equal kwd unshifted-kwd)
1611 (throw 'found unshifted-sym))
1612 (if (string-equal kwd shifted-kwd)
1613 (throw 'found shifted-sym))))
1615 ((eq element-tag 'function-call)
1616 (let* ((info-part (artist-mt-get-info-part element))
1617 (keyword (artist-fc-get-keyword info-part))
1618 (symbol (artist-fc-get-symbol info-part)))
1619 (if (string-equal kwd keyword)
1620 (throw 'found symbol))))
1621 ((eq element-tag 'menu)
1622 (let* ((info-part (artist-mt-get-info-part element))
1623 (items (artist-mn-get-items info-part))
1624 (answer (artist-mt-get-symbol-from-keyword-sub
1625 items kwd)))
1626 (if answer (throw 'found answer))))
1627 (t
1628 nil))))
1629 table)
1630 nil))
1633 ;
1634 ; Retrieving info from a graphics operation symbol
1635 ;
1637 (defun artist-go-retrieve-from-symbol (symbol retrieve-fn)
1638 "Search the master table for a graphics operation SYMBOL.
1639 Calls RETRIEVE-FN to retrieve information from that symbol's
1640 info-variant-part."
1641 (artist-go-retrieve-from-symbol-sub artist-mt symbol retrieve-fn))
1643 (defun artist-go-retrieve-from-symbol-sub (table symbol retrieve-fn)
1644 "Search the TABLE for a graphics operation SYMBOL.
1645 Calls RETRIEVE-FN to retrieve information from that symbol's
1646 info-variant-part."
1647 (catch 'found
1648 (mapc
1649 (lambda (element)
1650 (let ((element-tag (artist-mt-get-tag element)))
1651 (cond ((eq element-tag 'graphics-operation)
1652 (let* ((info-part (artist-mt-get-info-part element))
1653 (unshifted (artist-go-get-unshifted info-part))
1654 (shifted (artist-go-get-shifted info-part))
1655 (unshifted-sym (artist-go-get-symbol unshifted))
1656 (shifted-sym (artist-go-get-symbol shifted))
1657 (variant-part (cond
1658 ((eq unshifted-sym symbol) unshifted)
1659 ((eq shifted-sym symbol) shifted)
1660 (t nil))))
1661 (if variant-part ; if found do:
1662 (throw 'found (funcall retrieve-fn variant-part)))))
1664 ((eq element-tag 'menu)
1665 (let* ((info-part (artist-mt-get-info-part element))
1666 (items (artist-mn-get-items info-part))
1667 (answer (artist-go-retrieve-from-symbol-sub
1668 items symbol retrieve-fn)))
1669 (if answer (throw 'found answer)))))))
1671 table)
1672 nil))
1674 (defun artist-go-get-keyword-from-symbol (symbol)
1675 "Search the master table, get keyword from a graphics operation SYMBOL."
1676 (artist-go-retrieve-from-symbol symbol 'artist-go-get-keyword))
1678 (defun artist-go-get-mode-line-from-symbol (symbol)
1679 "Search the master table, get mode-line from a graphics operation SYMBOL."
1680 (artist-go-retrieve-from-symbol symbol 'artist-go-get-mode-line))
1682 (defun artist-go-get-arrow-pred-from-symbol (symbol)
1683 "Search the master table, get arrow-pred from a graphics operation SYMBOL."
1684 (artist-go-retrieve-from-symbol symbol 'artist-go-get-arrow-pred))
1686 (defun artist-go-get-arrow-set-fn-from-symbol (symbol)
1687 "Search the master table, get arrow-set-fn from a graphics operation SYMBOL."
1688 (artist-go-retrieve-from-symbol symbol 'artist-go-get-arrow-set-fn))
1690 (defun artist-go-get-init-fn-from-symbol (symbol)
1691 "Search the master table, get init-fn from a graphics operation SYMBOL."
1692 (artist-go-retrieve-from-symbol symbol 'artist-go-get-init-fn))
1694 (defun artist-go-get-prep-fill-fn-from-symbol (symbol)
1695 "Search the master table, get prep-fill-fn from a graphics operation SYMBOL."
1696 (artist-go-retrieve-from-symbol symbol 'artist-go-get-prep-fill-fn))
1698 (defun artist-go-get-exit-fn-from-symbol (symbol)
1699 "Search the master table, get exit-fn from a graphics operation SYMBOL."
1700 (artist-go-retrieve-from-symbol symbol 'artist-go-get-exit-fn))
1702 (defun artist-go-get-draw-fn-from-symbol (symbol)
1703 "Search the master table, get draw-fn from a graphics operation SYMBOL."
1704 (artist-go-retrieve-from-symbol symbol 'artist-go-get-draw-fn))
1706 (defun artist-go-get-draw-how-from-symbol (symbol)
1707 "Search the master table, get draw-how from a graphics operation SYMBOL."
1708 (artist-go-retrieve-from-symbol symbol 'artist-go-get-draw-how))
1710 (defun artist-go-get-undraw-fn-from-symbol (symbol)
1711 "Search the master table, get undraw-fn from a graphics operation SYMBOL."
1712 (artist-go-retrieve-from-symbol symbol 'artist-go-get-undraw-fn))
1714 (defun artist-go-get-interval-fn-from-symbol (symbol)
1715 "Search the master table, get interval-fn from a graphics operation SYMBOL."
1716 (artist-go-retrieve-from-symbol symbol 'artist-go-get-interval-fn))
1718 (defun artist-go-get-fill-pred-from-symbol (symbol)
1719 "Search the master table, get fill-pred from a graphics operation SYMBOL."
1720 (artist-go-retrieve-from-symbol symbol 'artist-go-get-fill-pred))
1722 (defun artist-go-get-fill-fn-from-symbol (symbol)
1723 "Search the master table, get fill-fn from a graphics operation SYMBOL."
1724 (artist-go-retrieve-from-symbol symbol 'artist-go-get-fill-fn))
1726 (defun artist-go-get-symbol-shift (symbol is-shifted)
1727 "Search for (shifted or unshifted) graphics operation SYMBOL.
1728 If IS-SHIFTED is non-nil, return the shifted symbol,
1729 otherwise the unshifted symbol."
1730 (artist-go-get-symbol-shift-sub artist-mt symbol is-shifted))
1732 (defun artist-go-get-symbol-shift-sub (table symbol is-shifted)
1733 "Search TABLE for (shifted or unshifted) graphics SYMBOL.
1734 If IS-SHIFTED is non-nil, return the shifted symbol,
1735 otherwise the unshifted symbol."
1736 (catch 'found
1737 (mapc
1738 (lambda (element)
1739 (let ((element-tag (artist-mt-get-tag element)))
1740 (cond ((eq element-tag 'graphics-operation)
1741 (let* ((info-part (artist-mt-get-info-part element))
1742 (unshift-variant (artist-go-get-unshifted info-part))
1743 (shift-variant (artist-go-get-shifted info-part))
1744 (unshift-sym (artist-go-get-symbol unshift-variant))
1745 (shift-sym (artist-go-get-symbol shift-variant)))
1746 (if (or (eq symbol unshift-sym) (eq symbol shift-sym))
1747 (throw 'found (if is-shifted shift-sym unshift-sym)))))
1749 ((eq element-tag 'menu)
1750 (let* ((info-part (artist-mt-get-info-part element))
1751 (items (artist-mn-get-items info-part))
1752 (answer (artist-go-get-symbol-shift-sub
1753 items symbol is-shifted)))
1754 (if answer (throw 'found answer)))))))
1756 table)
1757 nil))
1759 ;
1760 ; Retrieving info from a function-call symbol
1761 ;
1763 (defun artist-fc-retrieve-from-symbol (symbol retrieve-fn)
1764 "Search the master table for a function call SYMBOL.
1765 Calls RETRIEVE-FN to retrieve information from that symbol's
1766 info-variant-part."
1767 (artist-fc-retrieve-from-symbol-sub artist-mt symbol retrieve-fn))
1769 (defun artist-fc-retrieve-from-symbol-sub (table symbol retrieve-fn)
1770 "Search TABLE for a function-call SYMBOL.
1771 Calls RETRIEVE-FN to retrieve information from that symbol's
1772 info-variant-part."
1773 (catch 'found
1774 (mapc
1775 (lambda (element)
1776 (let ((element-tag (artist-mt-get-tag element)))
1777 (cond ((eq element-tag 'function-call)
1778 (let* ((info-part (artist-mt-get-info-part element))
1779 (fc-symbol (artist-fc-get-symbol info-part)))
1780 (if (eq fc-symbol symbol)
1781 (throw 'found (funcall retrieve-fn info-part)))))
1783 ((eq element-tag 'menu)
1784 (let* ((info-part (artist-mt-get-info-part element))
1785 (items (artist-mn-get-items info-part))
1786 (answer (artist-fc-retrieve-from-symbol-sub
1787 items symbol retrieve-fn)))
1788 (if answer (throw 'found answer)))))))
1790 table)
1791 nil))
1793 (defun artist-fc-get-fn-from-symbol (symbol)
1794 "Search the master table to get function from a function call SYMBOL."
1795 (artist-fc-retrieve-from-symbol symbol 'artist-fc-get-fn))
1798 ;;
1799 ;; Utilities
1800 ;;
1802 ;; Macro that won't funcall the function if it is nil.
1803 ;;
1804 (defmacro artist-funcall (fn &rest args)
1805 "Call function FN with ARGS, if FN is not nil."
1806 (list 'if fn (cons 'funcall (cons fn args))))
1808 (defun artist-uniq (l)
1809 "Remove consecutive duplicates in list L. Comparison is done with `equal'."
1810 (cond ((null l) nil)
1811 ((null (cdr l)) l) ; only one element in list
1812 ((equal (car l) (car (cdr l))) (artist-uniq (cdr l))) ; first 2 equal
1813 (t (cons (car l) (artist-uniq (cdr l)))))) ; first 2 are different
1815 (defun artist-string-split (str r)
1816 "Split string STR at occurrences of regexp R, returning a list of strings."
1817 (let ((res nil)
1818 (start 0)
1819 (match-pos 0))
1820 (while (setq match-pos (string-match r str start))
1821 (setq res (cons (copy-sequence (substring str start match-pos)) res))
1822 (setq start (match-end 0)))
1823 (if (null res)
1824 (list str)
1825 (if (< (match-end 0) (- (length str) 1))
1826 (setq res (cons (substring str (match-end 0) (length str)) res)))
1827 (reverse res))))
1829 (defun artist-string-to-file (str file-name)
1830 "Write string STR to file FILE-NAME."
1831 (write-region str 'end-is-ignored file-name nil 'no-message))
1833 (defun artist-file-to-string (file-name)
1834 "Read from file FILE-NAME into a string."
1835 (save-excursion
1836 (let ((tmp-buffer (get-buffer-create (concat "*artist-" file-name "*"))))
1837 (set-buffer tmp-buffer)
1838 (goto-char (point-min))
1839 (insert-file-contents file-name nil nil nil t)
1840 (let ((str (copy-sequence (buffer-substring (point-min)
1841 (point-max)))))
1842 (kill-buffer tmp-buffer)
1843 str))))
1845 (defun artist-clear-buffer (buf)
1846 "Clear contents of buffer BUF."
1847 (with-current-buffer buf
1848 (goto-char (point-min))
1849 (delete-char (- (point-max) (point-min)) nil)))
1852 (defun artist-system (program stdin &optional program-args)
1853 "Run PROGRAM synchronously with the contents of string STDIN to stdin.
1854 Optional args PROGRAM-ARGS are arguments to PROGRAM.
1855 Return a list (RETURN-CODE STDOUT STDERR)."
1856 (save-excursion
1857 (let* ((tmp-stdin-file-name (if stdin
1858 (make-temp-file "artist-stdin.")
1859 nil))
1860 (tmp-stdout-buffer (get-buffer-create
1861 (concat "*artist-" program "*")))
1862 (tmp-stderr-file-name (make-temp-file "artist-stdout."))
1863 (binary-process-input nil) ; for msdos
1864 (binary-process-output nil))
1866 ;; Prepare stdin
1867 (if stdin (artist-string-to-file stdin tmp-stdin-file-name))
1869 ;; Clear the buffer
1870 (artist-clear-buffer tmp-stdout-buffer)
1872 ;; Start the program
1873 (unwind-protect
1874 (let ((res (if program-args
1875 (apply 'call-process
1876 program
1877 tmp-stdin-file-name
1878 (list tmp-stdout-buffer
1879 tmp-stderr-file-name)
1880 nil
1881 (if (stringp program-args)
1882 (list program-args)
1883 program-args))
1884 (apply 'call-process
1885 program
1886 tmp-stdin-file-name
1887 (list tmp-stdout-buffer
1888 tmp-stderr-file-name)
1889 nil))))
1891 ;; the return value
1892 (list res
1893 (with-current-buffer tmp-stdout-buffer
1894 (buffer-substring (point-min) (point-max)))
1895 (artist-file-to-string tmp-stderr-file-name)))
1897 ;; Unwind: remove temporary files and buffers
1898 (if (and stdin (file-exists-p tmp-stdin-file-name))
1899 (delete-file tmp-stdin-file-name))
1900 (if (file-exists-p tmp-stderr-file-name)
1901 (delete-file tmp-stderr-file-name))
1902 (if (memq tmp-stdout-buffer (buffer-list))
1903 (kill-buffer tmp-stdout-buffer))))))
1905 ;; Routines that deal with the buffer
1906 ;;
1907 ;; artist-current-line get line number (top of buffer is 0)
1908 ;;
1909 ;; artist-move-to-xy move to (x,y) (0,0) is beg-of-buffer
1910 ;;
1911 ;; artist-get-char-at-xy get char in at (x,y)
1912 ;;
1913 ;; artist-replace-char overwrite (replace) char at point
1914 ;; artist-replace-chars overwrite (replace) chars at point
1915 ;;
1917 (defsubst artist-current-column ()
1918 "Return point's current column."
1919 (current-column))
1921 (defsubst artist-current-line ()
1922 "Return point's current line, buffer-relative. Top of buffer is 0."
1923 (+ (count-lines 1 (point))
1924 (if (= (current-column) 0) 1 0)
1925 -1))
1927 (defsubst artist-move-to-xy (x y)
1928 "Move to column X, at row Y from the top of buffer. Top line is 0."
1929 ;;
1930 ;; Q: Why do we do forward-line twice?
1931 ;; A: The documentation for forward-line says
1932 ;;
1933 ;; "... Returns the count of lines left to move. ... With
1934 ;; positive N, a non-empty line at the end counts as one
1935 ;; line successfully moved (for the return value)."
1936 ;;
1937 ;; This means that if we are trying to move forward past the end
1938 ;; of the buffer, and that last line happened to be longer than
1939 ;; the current column, then we end up at the end of that last
1940 ;; line, and forward-line returns one less than we actually
1941 ;; wanted to move.
1942 ;;
1943 ;; Example: In the figure below, the `X' is the very last
1944 ;; character in the buffer ("a non-empty line at the
1945 ;; end"). Suppose point is at P. Then (forward-line 1)
1946 ;; returns 0 and puts point after the `X'.
1947 ;;
1948 ;; --------top of buffer--------
1949 ;;
1950 ;; P X
1951 ;; -------bottom of buffer------
1952 ;;
1953 ;; But, if we are at the end of buffer when trying to move
1954 ;; forward, then forward-line will return the (for us) correct
1955 ;; value, which is good, because we will come to the end of the
1956 ;; buffer by the first forward-line. The second forward-line
1957 ;; will then get us where we really wanted to go.
1958 ;;
1959 ;; If we are not moving past the end of the buffer, then the
1960 ;; second forward-line will return 0.
1961 ;;
1962 ;; Q: What happens if we are moving upwards?
1963 ;; A: That will work good. insert-char won't insert a negative
1964 ;; number of chars, and forward-line will fail silently if we are
1965 ;; moving past the beginning of the buffer.
1966 ;;
1967 (forward-line (- y (artist-current-line)))
1969 (move-to-column (max x 0) t)
1970 (let ((curr-y (artist-current-line)))
1971 (setq artist-draw-region-min-y (min curr-y artist-draw-region-min-y))
1972 (setq artist-draw-region-max-y (max curr-y artist-draw-region-max-y))))
1974 (defsubst artist-get-char-at-xy (x y)
1975 "Return the character found at column X, row Y.
1976 Also updates the variables `artist-draw-min-y' and `artist-draw-max-y'."
1977 (artist-move-to-xy x y)
1978 (let ((curr-y (artist-current-line)))
1979 (setq artist-draw-region-min-y (min curr-y artist-draw-region-min-y))
1980 (setq artist-draw-region-max-y (max curr-y artist-draw-region-max-y)))
1981 (following-char))
1984 (defsubst artist-get-replacement-char (c)
1985 "Retrieve a replacement for character C from `artist-replacement-table'.
1986 The replacement is used to convert tabs and new-lines to spaces."
1987 ;; Characters may be outside the range of the `artist-replacement-table',
1988 ;; for example if they are Unicode code points >= 256.
1989 ;; Check so we don't attempt to access the array out of its bounds,
1990 ;; assuming no such character needs to be replaced.
1991 (if (< c (length artist-replacement-table))
1992 (aref artist-replacement-table c)
1993 c))
1995 (defun artist-get-char-at-xy-conv (x y)
1996 "Retrieve the character at X, Y, converting tabs and new-lines to spaces."
1997 (save-excursion
1998 (artist-get-replacement-char (artist-get-char-at-xy x y))))
2001 (defun artist-replace-char (new-char)
2002 "Replace the character at point with NEW-CHAR."
2003 (let ((overwrite-mode 'overwrite-mode-textual)
2004 (fill-column 32765) ; Large :-)
2005 (blink-matching-paren nil))
2006 (setq last-command-event (artist-get-replacement-char new-char))
2007 (self-insert-command 1)))
2009 (defun artist-replace-chars (new-char count)
2010 "Replace characters at point with NEW-CHAR. COUNT chars are replaced."
2011 ;; Check that the variable exists first. The doc says it was added in 19.23.
2012 (if (and (and (boundp 'emacs-major-version) (= emacs-major-version 20))
2013 (and (boundp 'emacs-minor-version) (<= emacs-minor-version 3)))
2014 ;; This is a bug workaround for Emacs 20, versions up to 20.3:
2015 ;; The self-insert-command doesn't care about the overwrite-mode,
2016 ;; so the insertion is done in the same way as in picture mode.
2017 ;; This seems to be a little bit slower.
2018 (let* ((replaced-c (artist-get-replacement-char new-char))
2019 (replaced-s (make-string count replaced-c)))
2020 (artist-move-to-xy (+ (artist-current-column) count)
2021 (artist-current-line))
2022 (delete-char (- count))
2023 (insert replaced-s))
2024 ;; In emacs-19, the self-insert-command works better
2025 (let ((overwrite-mode 'overwrite-mode-textual)
2026 (fill-column 32765) ; Large :-)
2027 (blink-matching-paren nil))
2028 (setq last-command-event (artist-get-replacement-char new-char))
2029 (self-insert-command count))))
2031 (defsubst artist-replace-string (string &optional see-thru)
2032 "Replace contents at point with STRING.
2033 With optional argument SEE-THRU set to non-nil, text in the buffer
2034 ``shines thru'' blanks in the STRING."
2035 (let ((char-list (append string nil)) ; convert the string to a list
2036 (overwrite-mode 'overwrite-mode-textual)
2037 (fill-column 32765) ; Large :-)
2038 (blink-matching-paren nil))
2039 (while char-list
2040 (let ((c (car char-list)))
2041 (if (and see-thru (= (artist-get-replacement-char c) ?\s))
2042 (artist-move-to-xy (1+ (artist-current-column))
2043 (artist-current-line))
2044 (artist-replace-char c)))
2045 (setq char-list (cdr char-list)))))
2047 ;;
2048 ;; Routines for setting and unsetting points
2049 ;; Used when not rubber-banding
2050 ;;
2051 (defun artist-no-rb-unset-point1 ()
2052 "Unsets point 1 when not rubber-banding."
2053 (let ((x-now (artist-current-column))
2054 (y-now (artist-current-line))
2055 (x (aref artist-rb-save-data 0))
2056 (y (aref artist-rb-save-data 1)))
2057 (artist-move-to-xy x y)
2058 (artist-replace-char (aref artist-rb-save-data 2))
2059 (artist-move-to-xy x-now y-now)))
2061 (defun artist-no-rb-set-point1 (x y)
2062 "Set point 1 at X, Y when not rubber-banding."
2063 (let ((x-now (artist-current-column))
2064 (y-now (artist-current-line)))
2065 (aset artist-rb-save-data 0 x)
2066 (aset artist-rb-save-data 1 y)
2067 (aset artist-rb-save-data 2 (artist-get-char-at-xy x y))
2068 (artist-move-to-xy x y)
2069 (artist-replace-char artist-first-char)
2070 (artist-move-to-xy x-now y-now)
2071 (aset artist-rb-save-data 6 0)))
2073 (defun artist-no-rb-unset-point2 ()
2074 "This function unsets point 2 when not rubber-banding."
2075 (if (= (aref artist-rb-save-data 6) 1)
2076 (let ((x-now (artist-current-column))
2077 (y-now (artist-current-line))
2078 (x (aref artist-rb-save-data 3))
2079 (y (aref artist-rb-save-data 4)))
2080 (artist-move-to-xy x y)
2081 (artist-replace-char (aref artist-rb-save-data 5))
2082 (artist-move-to-xy x-now y-now))))
2084 (defun artist-no-rb-set-point2 (x y)
2085 "Set point 2 at X, Y when not rubber-banding."
2086 (let ((x-now (artist-current-column))
2087 (y-now (artist-current-line)))
2088 (aset artist-rb-save-data 3 x)
2089 (aset artist-rb-save-data 4 y)
2090 (aset artist-rb-save-data 5 (artist-get-char-at-xy x y))
2091 (artist-move-to-xy x y)
2092 (artist-replace-char artist-second-char)
2093 (artist-move-to-xy x-now y-now)
2094 (aset artist-rb-save-data 6 1)))
2096 (defun artist-no-rb-unset-points ()
2097 "This function unsets point 1 and 2 when not rubber-banding."
2098 (artist-no-rb-unset-point1)
2099 (artist-no-rb-unset-point2))
2102 ;; artist-intersection-char
2103 ;;
2104 ;; Note: If changing this, see the notes for artist-unintersection-char
2105 ;; and artist-vaporize-lines
2106 ;;
2107 (defun artist-intersection-char (new-c old-c)
2108 "Calculates intersection character when drawing a NEW-C on top of an OLD-C.
2109 Return character according to this scheme:
2111 OLD-C NEW-C return
2112 - | +
2113 | - +
2114 + | +
2115 + - +
2118 X / X
2120 other combinations NEW-C"
2122 (cond ((and (= old-c ?- ) (= new-c ?| )) ?+ )
2123 ((and (= old-c ?| ) (= new-c ?- )) ?+ )
2124 ((and (= old-c ?+ ) (= new-c ?- )) ?+ )
2125 ((and (= old-c ?+ ) (= new-c ?| )) ?+ )
2128 ((and (= old-c ?X ) (= new-c ?/ )) ?X )
2130 (t new-c)))
2132 ;; artist-unintersection-char
2133 ;;
2134 ;; Note: If changing this, see the note for artist-vaporize-lines
2135 ;;
2136 (defun artist-unintersection-char (line-c buffer-c)
2137 "Restore character to before intersection when removing LINE-C from BUFFER-C.
2138 Return character according to this scheme:
2140 LINE-C BUFFER-C return
2141 - + |
2142 | + -
2145 other combinations `artist-erase-char'."
2147 (cond ((and (= line-c ?- ) (= buffer-c ?+ )) ?| )
2148 ((and (= line-c ?| ) (= buffer-c ?+ )) ?- )
2151 ((= line-c buffer-c) artist-erase-char)
2152 (t buffer-c)))
2155 ;; Computing the line-char to use
2156 ;; for use with borderless shapes
2157 ;;
2158 (defsubst artist-compute-line-char ()
2159 "Compute which character to use for lines, if any.
2160 Return value is either nil for the default characters that make up lines, or
2161 a character chosen depending on the variables `artist-borderless-shapes',
2162 `artist-fill-char-set', `artist-fill-char' and
2163 `artist-line-char-set' and `artist-line-char'."
2164 (if (and artist-borderless-shapes artist-fill-char-set)
2165 artist-fill-char
2166 (if artist-line-char-set
2167 artist-line-char
2168 nil)))
2171 ;; Things for drawing horizontal, vertical and diagonal (straight) lines.
2172 ;;
2173 ;; A line here is a vector:
2174 ;; [ start-x start-y length direction saved-char-1 saved-char-2 ... ]
2175 ;; directions start with 0 at the x-axis and counts anti clockwise.
2176 ;;
2177 (defvar artist-direction-info
2178 ;; x y char
2179 [ [ 1 0 ?- ] ; direction 0
2181 [ 0 1 ?| ] ; direction 2
2182 [ -1 1 ?/ ] ; direction 3
2183 [ -1 0 ?- ] ; direction 4
2185 [ 0 -1 ?| ] ; direction 6
2186 [ 1 -1 ?/ ] ] ; direction 7
2187 "Table used for stepping x and y coordinates in a specific direction.
2188 This table is also used for determining which char to use for that direction.")
2190 (defsubst artist-direction-step-x (direction)
2191 "Return the x-step for DIRECTION from the `artist-direction-info' table."
2192 (aref (aref artist-direction-info direction) 0))
2194 (defsubst artist-direction-step-y (direction)
2195 "Return the y-step for DIRECTION from the `artist-direction-info' table."
2196 (aref (aref artist-direction-info direction) 1))
2198 (defun artist-direction-char (direction)
2199 "Return the character for DIRECTION from the `artist-direction-info' table."
2200 (aref (aref artist-direction-info direction) 2))
2202 ;; artist-find-direction
2203 ;;
2204 ;;
2205 ;;
2206 (defun artist-find-direction (x1 y1 x2 y2)
2207 "Find the direction from point X1,Y1 to X2,Y2.
2208 Returns a DIRECTION, a number 0--7, coded as follows:
2210 5 6 7
2212 4 - * - 0
2214 3 2 1"
2215 (let ((delta-x (- x2 x1))
2216 (delta-y (- y2 y1)))
2217 (cond ((>= delta-x (* 2 (abs delta-y))) 0)
2218 ((>= delta-y (* 2 (abs delta-x))) 2)
2219 ((>= (- delta-x) (* 2 (abs delta-y))) 4)
2220 ((>= (- delta-y) (* 2 (abs delta-x))) 6)
2221 ((and (>= delta-x 0) (>= delta-y 0)) 1)
2222 ((and (<= delta-x 0) (>= delta-y 0)) 3)
2223 ((and (<= delta-x 0) (<= delta-y 0)) 5)
2224 ((and (>= delta-x 0) (<= delta-y 0)) 7))))
2226 (defun artist-straight-calculate-length (direction x1 y1 x2 y2)
2227 "Calculate length for a straight line in DIRECTION from X1,Y1 to X2,Y2."
2228 (cond ((or (= direction 7)
2229 (= direction 0)
2230 (= direction 1)) (1+ (- x2 x1)))
2231 ((or (= direction 3)
2232 (= direction 4)
2233 (= direction 5)) (1+ (- x1 x2)))
2234 (t (1+ (abs (- y2 y1))))))
2236 (defun artist-sline (x1 y1 x2 y2)
2237 "Create a straight line from X1,Y1 to X2,Y2."
2238 (let* ((direction (artist-find-direction x1 y1 x2 y2))
2239 (length (artist-straight-calculate-length direction x1 y1 x2 y2))
2240 (line (make-vector (+ length 4) x1)))
2241 ;; not needed:
2242 ;; (aset line 0 x1)
2243 ;; because we set all elements to x1
2244 (aset line 1 y1)
2245 (aset line 2 length)
2246 (aset line 3 direction)
2247 line))
2249 (defun artist-save-chars-under-sline (line)
2250 "Save characters under a LINE."
2251 (let ((x (aref line 0))
2252 (y (aref line 1))
2253 (length (+ (aref line 2) 4))
2254 (direction (aref line 3))
2255 (i 4))
2256 (while (< i length)
2257 (aset line i (artist-get-char-at-xy x y))
2258 (setq x (+ x (artist-direction-step-x direction)))
2259 (setq y (+ y (artist-direction-step-y direction)))
2260 (setq i (1+ i))))
2261 line)
2265 ;; Things for drawing lines in all directions.
2266 ;; The line drawing engine is the eight-point algorithm.
2267 ;;
2268 ;; A line is here a list of (x y saved-char new-char)s.
2269 ;;
2270 (defvar artist-octant-info
2271 ;; Initial Step in Step in
2272 ;; coeffs x and y x and y
2273 ;; for if q >= 0 if g < 0
2274 ;; dfdx,dfdy
2275 [ [ 2 1 1 0 1 1 ] ; 1st octant
2276 [ 1 2 1 1 0 1 ] ; 2nd octant
2277 [ -1 2 0 1 -1 1 ] ; 3rd octant
2278 [ -2 1 -1 1 -1 0 ] ; 4th octant
2279 [ -2 -1 -1 0 -1 -1 ] ; 5th octant
2280 [ -1 -2 -1 -1 0 -1 ] ; 6th octant
2281 [ 1 -2 0 -1 1 -1 ] ; 7th octant
2282 [ 2 -1 1 -1 1 0 ] ] ; 8th octant
2283 "Table used by line drawing algorithm (eight point).")
2285 ;; Primitives for the artist-octant-info.
2286 ;; Decrease octant by 1 since elt counts from 0 and octant counts from 1.
2287 ;;
2288 (defsubst artist-get-dfdx-init-coeff (octant)
2289 "Retrieve dfdx component for OCTANT."
2290 (aref (aref artist-octant-info (- octant 1)) 0))
2292 (defsubst artist-get-dfdy-init-coeff (octant)
2293 "Retrieve dfdy component for OCTANT."
2294 (aref (aref artist-octant-info (- octant 1)) 1))
2296 (defsubst artist-get-x-step-q>=0 (octant)
2297 "Retrieve x-step component for OCTANT when q >= 0."
2298 (aref (aref artist-octant-info (- octant 1)) 2))
2300 (defsubst artist-get-y-step-q>=0 (octant)
2301 "Retrieve y-step component for OCTANT when q >= 0."
2302 (aref (aref artist-octant-info (- octant 1)) 3))
2304 (defsubst artist-get-x-step-q<0 (octant)
2305 "Retrieve x-step component for OCTANT for q < 0."
2306 (aref (aref artist-octant-info (- octant 1)) 4))
2308 (defsubst artist-get-y-step-q<0 (octant)
2309 "Retrieve y-step component for OCTANT for q < 0."
2310 (aref (aref artist-octant-info (- octant 1)) 5))
2313 ;; Find octant from x1 y1 x2 y2 coordinates.
2314 ;;
2315 (defun artist-find-octant (x1 y1 x2 y2)
2316 "Find octant for a line from X1,Y1 to X2,Y2.
2317 Octant are numbered 1--8, anti-clockwise as:
2321 ---+---
2325 (if (<= x1 x2) ; quadrant 1 or 4
2326 (if (<= y1 y2) ; quadrant 1, octant 1 or 2
2327 (if (>= (- x2 x1) (- y2 y1))
2328 1
2329 2)
2330 (if (>= (- x2 x1) (- (- y2 y1))) ; quadrant 4, octant 7 or 8
2331 8
2332 7))
2333 (if (<= y1 y2) ; quadrant 2 or 3
2334 (if (>= (- (- x2 x1)) (- y2 y1)) ; quadrant 2, octant 3 or 4
2335 4
2336 3)
2337 (if (>= (- (- x2 x1)) (- (- y2 y1))) ; quadrant 3, octant 5 or 6
2338 5
2339 6))))
2341 ;; Some inline functions for creating, setting and reading
2342 ;; members of a coordinate
2343 ;;
2345 (defsubst artist-new-coord (x y &optional new-char)
2346 "Create a new coordinate at X,Y for use in a line.
2347 Optional argument NEW-CHAR can be used for setting the new-char component
2348 in the coord."
2349 (let ((coord (make-vector 4 x)))
2350 (aset coord 1 y)
2351 (aset coord 3 new-char)
2352 coord))
2354 (defsubst artist-coord-get-x (coord)
2355 "Retrieve the x component of a COORD."
2356 (aref coord 0))
2358 (defsubst artist-coord-get-y (coord)
2359 "Retrieve the y component of a COORD."
2360 (aref coord 1))
2362 (defsubst artist-coord-set-x (coord new-x)
2363 "Set the x component of a COORD to NEW-X."
2364 (aset coord 0 new-x)
2365 coord)
2367 (defsubst artist-coord-set-y (coord new-y)
2368 "Set the y component of a COORD to NEW-Y."
2369 (aset coord 1 new-y)
2370 coord)
2372 (defsubst artist-coord-get-saved-char (coord)
2373 "Retrieve the saved char component of a COORD."
2374 (aref coord 2))
2376 (defsubst artist-coord-get-new-char (coord)
2377 "Retrieve the new char component of a COORD."
2378 (aref coord 3))
2380 (defsubst artist-coord-add-saved-char (coord saved-char)
2381 "Set the saved char component of a COORD to SAVED-CHAR."
2382 (aset coord 2 saved-char)
2383 coord)
2385 (defsubst artist-coord-add-new-char (coord new-char)
2386 "Set the new char component of a COORD to NEW-CHAR."
2387 (aset coord 3 new-char)
2388 coord)
2390 (defsubst artist-coord-set-new-char (coord new-char)
2391 "Set the new char component of a COORD to NEW-CHAR."
2392 (aset coord 3 new-char)
2393 coord)
2396 ;; Pretend we are plotting a pixel. Instead we just list it
2397 ;;
2398 (defmacro artist-put-pixel (point-list x y)
2399 "In POINT-LIST, store a ``pixel'' at coord X,Y."
2400 (list 'setq point-list
2401 (list 'append point-list (list 'list (list 'artist-new-coord x y)))))
2403 ;; Calculate list of points using eight point algorithm
2404 ;; return a list of coords
2405 ;;
2406 (defun artist-eight-point (x1 y1 x2 y2)
2407 "Run the eight-point algorithm to get a list of coords from X1,Y1 to X2,Y2."
2408 (let* ((point-list nil)
2409 (octant (artist-find-octant x1 y1 x2 y2))
2410 (dfdx-coeff (artist-get-dfdx-init-coeff octant))
2411 (dfdy-coeff (artist-get-dfdy-init-coeff octant))
2412 (x-step-q>=0 (artist-get-x-step-q>=0 octant))
2413 (y-step-q>=0 (artist-get-y-step-q>=0 octant))
2414 (x-step-q<0 (artist-get-x-step-q<0 octant))
2415 (y-step-q<0 (artist-get-y-step-q<0 octant))
2416 (dfdx (- (- y2 y1)))
2417 (dfdy (- x2 x1))
2418 (x x1)
2419 (y y1)
2420 (f 0)
2421 (q (+ (* 2 f)
2422 (* dfdx-coeff dfdx)
2423 (* dfdy-coeff dfdy))))
2424 (artist-put-pixel point-list x y)
2425 (while (or (not (eq x x2)) (not (eq y y2)))
2426 (if (>= q 0)
2427 (progn
2428 (setq x (+ x x-step-q>=0))
2429 (setq y (+ y y-step-q>=0))
2430 (setq f (+ f (* x-step-q>=0 dfdx) (* y-step-q>=0 dfdy))))
2431 (progn
2432 (setq x (+ x x-step-q<0))
2433 (setq y (+ y y-step-q<0))
2434 (setq f (+ f (* x-step-q<0 dfdx) (* y-step-q<0 dfdy)))))
2435 (setq q (+ (* 2 f) (* dfdx-coeff dfdx) (* dfdy-coeff dfdy)))
2436 (artist-put-pixel point-list x y))
2437 point-list))
2439 ;; artist-save-chars-under-point-list
2440 ;; Remembers the chars that were there before we did draw the line.
2441 ;; Returns point-list.
2442 ;;
2443 (defun artist-save-chars-under-point-list (point-list)
2444 "Save characters originally under POINT-LIST."
2445 (mapcar
2446 (lambda (coord)
2447 (artist-coord-add-saved-char
2448 coord
2449 (artist-get-char-at-xy (artist-coord-get-x coord)
2450 (artist-coord-get-y coord))))
2451 point-list))
2453 ;; artist-calculate-new-char, artist-calculate-new-chars
2454 ;; Calculates which char to insert depending on direction of point-list.
2455 ;;
2456 ;; Depending on new-coord's position relative to last-coord one of the
2457 ;; following chars are returned: \ | / - o, as indicated by this:
2458 ;;
2459 ;; \ | /
2460 ;; - o -
2461 ;; / | \
2462 ;;
2463 ;; artist-calculate-new-char works on one coordinate, returns char.
2464 ;; artist-calculate-new-chars works on a point-list, returns point-list.
2465 ;;
2466 (defun artist-calculate-new-char (last-coord new-coord)
2467 "Return a line-char to use when moving from LAST-COORD to NEW-COORD."
2468 (let ((last-x (artist-coord-get-x last-coord))
2469 (last-y (artist-coord-get-y last-coord))
2470 (new-x (artist-coord-get-x new-coord))
2471 (new-y (artist-coord-get-y new-coord)))
2472 (cond ((> new-x last-x) (cond ((< new-y last-y) ?/ )
2474 (t ?- )))
2476 ((> new-y last-y) ?/ )
2477 (t ?- )))
2478 ((eq new-y last-y) ?o)
2479 (t ?| ))))
2481 (defun artist-calculate-new-chars (point-list)
2482 "Return a list of coords with line-chars calculated. Input: POINT-LIST."
2483 (if (null (cdr point-list))
2484 (list (artist-coord-add-new-char (car point-list) ?o ))
2485 (let ((last-coord (car point-list)))
2486 (cons (artist-coord-add-new-char
2487 (car point-list)
2488 (artist-calculate-new-char (car (cdr point-list))
2489 (car point-list)))
2490 (mapcar
2491 (lambda (this-coord)
2492 (prog1
2493 (artist-coord-add-new-char
2494 this-coord
2495 (artist-calculate-new-char last-coord this-coord))
2496 (setq last-coord this-coord)))
2497 (cdr point-list))))))
2499 ;; artist-modify-new-chars
2500 ;; Replaces some characters with some other characters.
2501 ;;
2502 ;; artist-modify-new-chars works on a point-list, returns point-list.
2503 ;;
2504 (defun artist-modify-new-chars (point-list)
2505 "Replace intersecting characters in POINT-LIST.
2506 This function returns a point-list."
2507 (mapcar
2508 (lambda (coord)
2509 (let* ((new-c (artist-coord-get-new-char coord))
2510 (saved-c (artist-coord-get-saved-char coord))
2511 (modified-c (artist-intersection-char new-c saved-c)))
2512 (artist-coord-set-new-char coord modified-c)))
2513 point-list))
2516 ;;
2517 ;; functions for accessing endpoints and elements in object requiring
2518 ;; 2 endpoints
2519 ;;
2521 (defun artist-make-endpoint (x y)
2522 "Create an endpoint at X, Y."
2523 (let ((new-endpoint (make-vector 2 x)))
2524 (aset new-endpoint 1 y)
2525 new-endpoint))
2527 (defun artist-endpoint-get-x (endpoint)
2528 "Retrieve the x component of an ENDPOINT."
2529 (aref endpoint 0))
2531 (defun artist-endpoint-get-y (endpoint)
2532 "Retrieve the y component of an ENDPOINT."
2533 (aref endpoint 1))
2535 (defun artist-make-2point-object (endpoint1 endpoint2 shapeinfo)
2536 "Create a 2-point object of ENDPOINT1, ENDPOINT2 and SHAPEINFO."
2537 (list endpoint1 endpoint2 shapeinfo))
2539 (defun artist-2point-get-endpoint1 (obj)
2540 "Retrieve the first endpoint of a 2-point object OBJ."
2541 (elt obj 0))
2543 (defun artist-2point-get-endpoint2 (obj)
2544 "Retrieve the second endpoint of a 2-point object OBJ."
2545 (elt obj 1))
2547 (defun artist-2point-get-shapeinfo (obj)
2548 "Retrieve the shapeinfo component of a 2-point object OBJ."
2549 (elt obj 2))
2552 ;;
2553 ;; Drawing and undrawing lines (any direction)
2554 ;;
2556 (defun artist-draw-line (x1 y1 x2 y2)
2557 "Draw a line from X1, Y1 to X2, Y2.
2559 Output is a line, which is a list (END-POINT-1 END-POINT-2 SHAPE-INFO).
2561 END-POINT-1 and END-POINT-2 are two-element vectors on the form [X Y].
2562 SHAPE-INFO is a list of vectors [X Y SAVED-CHAR NEW-CHAR]."
2563 (let ((endpoint1 (artist-make-endpoint x1 y1))
2564 (endpoint2 (artist-make-endpoint x2 y2)))
2565 (artist-make-2point-object
2566 endpoint1
2567 endpoint2
2568 (mapcar
2569 (lambda (coord)
2570 (artist-move-to-xy (artist-coord-get-x coord)
2571 (artist-coord-get-y coord))
2572 (if artist-line-char-set
2573 (artist-replace-char artist-line-char)
2574 (artist-replace-char (artist-coord-get-new-char coord)))
2575 coord)
2576 (artist-modify-new-chars
2577 (artist-calculate-new-chars
2578 (artist-save-chars-under-point-list
2579 (artist-eight-point x1 y1 x2 y2))))))))
2581 (defun artist-undraw-line (line)
2582 "Undraw LINE."
2583 (mapcar
2584 (lambda (coord)
2585 (artist-move-to-xy (artist-coord-get-x coord)
2586 (artist-coord-get-y coord))
2587 (artist-replace-char (artist-coord-get-saved-char coord))
2588 coord)
2589 (artist-2point-get-shapeinfo line)))
2591 ;;
2592 ;; Drawing and undrawing straight lines
2593 ;;
2595 (defun artist-draw-sline (x1 y1 x2 y2)
2596 "Draw a straight line from X1, Y1 to X2, Y2.
2597 Straight lines are vertical, horizontal or diagonal lines.
2598 They are faster to draw and most often they are what you need
2599 when drawing a simple image.
2601 Output is a straight line, which is a list on the form
2602 \(END-POINT-1 END-POINT-2 SHAPE-INFO).
2604 END-POINT-1 and END-POINT-2 are two-element vectors on the form [X Y].
2605 SHAPE-INFO is a vector [START-X START-Y LENGTH-OF-LINE DIRECTION
2606 ORIGINAL-CHAR-1 ORIGINAL-CHAR-2 ... ]."
2607 (let* ((line (artist-save-chars-under-sline (artist-sline x1 y1 x2 y2)))
2608 (x (aref line 0))
2609 (y (aref line 1))
2610 (length (+ (aref line 2) 4))
2611 (direction (aref line 3))
2612 (line-char (artist-direction-char direction))
2613 (i 4)
2614 (endpoint1 (artist-make-endpoint x y))
2615 (endpoint2 nil))
2616 (while (< i length)
2617 (artist-move-to-xy x y)
2618 (if artist-line-char-set
2619 (artist-replace-char artist-line-char)
2620 (artist-replace-char (artist-intersection-char
2621 line-char
2622 (aref line i))))
2623 (if (not (< (1+ i) length))
2624 ;; This is the last element. Set the second endpoint
2625 (setq endpoint2 (artist-make-endpoint x y)))
2626 (setq x (+ x (artist-direction-step-x direction)))
2627 (setq y (+ y (artist-direction-step-y direction)))
2628 (setq i (1+ i)))
2629 (artist-make-2point-object endpoint1 endpoint2 line)))
2632 (defun artist-undraw-sline (line)
2633 "Undraw a straight line LINE."
2634 (if line
2635 (let* ((shape-info (artist-2point-get-shapeinfo line))
2636 (x (aref shape-info 0))
2637 (y (aref shape-info 1))
2638 (length (+ (aref shape-info 2) 4))
2639 (direction (aref shape-info 3))
2640 (i 4))
2641 (while (< i length)
2642 (artist-move-to-xy x y)
2643 (artist-replace-char (aref shape-info i))
2644 (setq x (+ x (artist-direction-step-x direction)))
2645 (setq y (+ y (artist-direction-step-y direction)))
2646 (setq i (1+ i))))))
2649 ;;
2650 ;; Drawing and undrawing rectangles and squares
2651 ;;
2653 (defun artist-draw-rect (x1 y1 x2 y2)
2654 "Draw a rectangle with corners at X1, Y1 and X2, Y2.
2656 Output is a rectangle, which is a list on the form
2657 \(END-POINT-1 END-POINT-2 SHAPE-INFO).
2659 END-POINT-1 and END-POINT-2 are two-element vectors on the form [X Y].
2660 SHAPE-INFO is a list of four straight lines."
2661 (let* ((artist-line-char (artist-compute-line-char))
2662 (artist-line-char-set artist-line-char)
2663 (line1 (artist-draw-sline x1 y1 x2 y1))
2664 (line2 (artist-draw-sline x2 y1 x2 y2))
2665 (line3 (artist-draw-sline x2 y2 x1 y2))
2666 (line4 (artist-draw-sline x1 y2 x1 y1))
2667 (endpoint1 (artist-make-endpoint x1 y1))
2668 (endpoint2 (artist-make-endpoint x2 y2)))
2669 (artist-make-2point-object endpoint1
2670 endpoint2
2671 (list line1 line2 line3 line4))))
2673 (defun artist-undraw-rect (rectangle)
2674 "Undraw RECTANGLE."
2675 (if rectangle
2676 (let ((shape-info (artist-2point-get-shapeinfo rectangle)))
2677 (artist-undraw-sline (elt shape-info 3))
2678 (artist-undraw-sline (elt shape-info 2))
2679 (artist-undraw-sline (elt shape-info 1))
2680 (artist-undraw-sline (elt shape-info 0)))))
2683 (defun artist-rect-corners-squarify (x1 y1 x2 y2)
2684 "Compute square corners from rectangle corners at X1, Y1 and X2, Y2.
2685 The square's first corner will be X1, Y1. The position of the second
2686 corner depends on which of X2 and Y2 is most far away from X1, Y1."
2687 (let* ((delta-x (- x2 x1))
2688 (delta-y (- y2 y1))
2689 (delta-x-sign (if (< delta-x 0) -1 1))
2690 (delta-y-sign (if (< delta-y 0) -1 1))
2691 (new-x2) ; set below
2692 (new-y2)) ; set below
2694 ;; Check which of x2 and y2 is most distant
2695 ;; take care to the aspect ratio
2696 (if (> (abs delta-x) (abs delta-y))
2698 ;; *** x2 more distant than y2 (with care taken to aspect ratio)
2699 (progn
2700 (setq new-x2 x2)
2701 (setq new-y2 (+ y1 (round (/ (* (abs delta-x) delta-y-sign)
2702 artist-aspect-ratio)))))
2704 ;; *** y2 more distant than x2 (with care taken to aspect ratio)
2705 (progn
2706 (setq new-x2 (round (+ x1 (* (* (abs delta-y) delta-x-sign)
2707 artist-aspect-ratio))))
2708 (setq new-y2 y2)))
2710 ;; Return this
2711 (list x1 y1 new-x2 new-y2)))
2714 (defun artist-draw-square (x1 y1 x2 y2)
2715 "Draw a square with corners at X1, Y1 and X2, Y2.
2717 Output is a square, which is a list on the form
2718 \(END-POINT-1 END-POINT-2 SHAPE-INFO).
2720 END-POINT-1 and END-POINT-2 are two-element vectors on the form [X Y].
2721 SHAPE-INFO is a list of four straight lines."
2722 (let* ((artist-line-char (artist-compute-line-char))
2723 (artist-line-char-set artist-line-char)
2724 (square-corners (artist-rect-corners-squarify x1 y1 x2 y2))
2725 (new-x1 (elt square-corners 0))
2726 (new-y1 (elt square-corners 1))
2727 (new-x2 (elt square-corners 2))
2728 (new-y2 (elt square-corners 3))
2729 (endpoint1 (artist-make-endpoint new-x1 new-y1))
2730 (endpoint2 (artist-make-endpoint new-x2 new-y2))
2731 (line1 (artist-draw-sline new-x1 new-y1 new-x2 new-y1))
2732 (line2 (artist-draw-sline new-x2 new-y1 new-x2 new-y2))
2733 (line3 (artist-draw-sline new-x2 new-y2 new-x1 new-y2))
2734 (line4 (artist-draw-sline new-x1 new-y2 new-x1 new-y1)))
2735 (artist-make-2point-object endpoint1
2736 endpoint2
2737 (list line1 line2 line3 line4))))
2739 (defun artist-undraw-square (square)
2740 "Undraw SQUARE."
2741 (if square
2742 (let ((shape-info (artist-2point-get-shapeinfo square)))
2743 (artist-undraw-sline (elt shape-info 3))
2744 (artist-undraw-sline (elt shape-info 2))
2745 (artist-undraw-sline (elt shape-info 1))
2746 (artist-undraw-sline (elt shape-info 0)))))
2748 ;;
2749 ;; Filling rectangles and squares
2750 ;;
2752 (defun artist-fill-rect (rect x1 y1 x2 y2)
2753 "Fill rectangle RECT from X1,Y1 to X2,Y2."
2754 (let ((x (1+ (min x1 x2)))
2755 (y (1+ (min y1 y2)))
2756 (x-max (max x1 x2))
2757 (y-max (max y1 y2)))
2758 (let ((w (- x-max x)))
2759 (while (< y y-max)
2760 (artist-move-to-xy x y)
2761 (artist-replace-chars artist-fill-char w)
2762 (setq y (1+ y))))))
2764 (defun artist-fill-square (square x1 y1 x2 y2)
2765 "Fill a SQUARE from X1,Y1 to X2,Y2."
2766 (let* ((square-corners (artist-rect-corners-squarify x1 y1 x2 y2))
2767 (new-x1 (elt square-corners 0))
2768 (new-y1 (elt square-corners 1))
2769 (new-x2 (elt square-corners 2))
2770 (new-y2 (elt square-corners 3))
2771 (x (1+ (min new-x1 new-x2)))
2772 (y (1+ (min new-y1 new-y2)))
2773 (x-max (max new-x1 new-x2))
2774 (y-max (max new-y1 new-y2))
2775 (w (- x-max x)))
2776 (while (< y y-max)
2777 (artist-move-to-xy x y)
2778 (artist-replace-chars artist-fill-char w)
2779 (setq y (1+ y)))))
2782 ;;
2783 ;; Pen drawing
2784 ;;
2786 (defun artist-pen (x1 y1)
2787 "Draw a character at X1, Y1.
2788 The character is replaced with the character in `artist-fill-char'."
2789 (artist-move-to-xy x1 y1)
2790 (artist-replace-char (if artist-line-char-set
2791 artist-line-char
2792 (if artist-fill-char-set
2793 artist-fill-char
2794 artist-default-fill-char))))
2797 (defun artist-pen-line (x1 y1)
2798 "Draw a line from last pen position to X1, Y1.
2799 The character is replaced with the character in `artist-fill-char'.
2800 This will store all points in `artist-key-poly-point-list' in reversed
2801 order (I assume it is faster to cons to the beginning of the list than
2802 to append to the end of the list, when doing free-hand drawing)."
2803 (let ((artist-line-char (if artist-line-char-set
2804 artist-line-char
2805 (if artist-fill-char-set
2806 artist-fill-char
2807 artist-default-fill-char))))
2809 ;; Draw line from last point to this
2810 (let ((x-last (car (car artist-key-poly-point-list)))
2811 (y-last (cdr (car artist-key-poly-point-list))))
2812 (artist-move-to-xy x-last y-last)
2813 (artist-replace-char artist-line-char)
2814 (artist-draw-line x-last y-last x1 y1))
2816 ;; Update the point-list
2817 (setq artist-key-poly-point-list
2818 (cons (cons x1 y1) artist-key-poly-point-list))))
2820 (defun artist-pen-reset-last-xy (x1 y1)
2821 "Reset the last x and y points to X1, Y1 when doing pen-drawing."
2822 (artist-clear-arrow-points)
2823 (setq artist-key-poly-point-list (list (cons x1 y1))))
2826 (defun artist-pen-set-arrow-points (x1 y1)
2827 "Set arrow points for pen drawing using X1, Y1.
2828 Also, the `artist-key-poly-point-list' is reversed."
2830 (setq artist-key-poly-point-list
2831 (artist-uniq artist-key-poly-point-list))
2833 (if (>= (length artist-key-poly-point-list) 2)
2835 ;; Only set arrow-points if the point-list has two or more entries
2836 (let ((xn (car (car artist-key-poly-point-list)))
2837 (yn (cdr (car artist-key-poly-point-list)))
2838 (xn-1 (car (car (cdr artist-key-poly-point-list))))
2839 (yn-1 (cdr (car (cdr artist-key-poly-point-list))))
2840 (dirn)) ; direction for point n
2841 (setq artist-key-poly-point-list (reverse artist-key-poly-point-list))
2842 (let ((x0 (car (car artist-key-poly-point-list)))
2843 (y0 (cdr (car artist-key-poly-point-list)))
2844 (x1 (car (car (cdr artist-key-poly-point-list))))
2845 (y1 (cdr (car (cdr artist-key-poly-point-list))))
2846 (dir0)) ; direction for point 0
2847 (setq dir0 (artist-find-direction x1 y1 x0 y0))
2848 (setq dirn (artist-find-direction xn-1 yn-1 xn yn))
2849 (setq artist-arrow-point-1 (artist-make-arrow-point x0 y0 dir0))
2850 (setq artist-arrow-point-2 (artist-make-arrow-point xn yn dirn))))))
2853 ;;
2854 ;; Text rendering
2855 ;;
2856 (defun artist-figlet-run (text font extra-args)
2857 "Run figlet rendering TEXT using FONT.
2858 EXTRA-ARGS for figlet, for the command line, may be specified."
2859 (let* ((figlet-args (cond ((and font extra-args)
2860 (cons (concat "-f" font)
2862 (font (concat "-f" font))
2863 (extra-args
2865 (t nil)))
2866 (figlet-output (artist-system artist-figlet-program text figlet-args))
2867 (exit-code (elt figlet-output 0))
2868 (stdout (elt figlet-output 1))
2869 (stderr (elt figlet-output 2)))
2870 (if (not (= exit-code 0))
2871 (error "Failed to render font: %s (%d)" stderr exit-code))
2872 stdout))
2874 (defun artist-figlet-get-font-list ()
2875 "Read fonts in with the shell command.
2876 Returns a list of strings."
2877 (let* ((cmd-interpreter "/bin/sh")
2878 (ls-cmd artist-figlet-list-fonts-command)
2879 (result (artist-system cmd-interpreter ls-cmd nil))
2880 (exit-code (elt result 0))
2881 (stdout (elt result 1))
2882 (stderr (elt result 2)))
2883 (if (not (= exit-code 0))
2884 (error "Failed to read available fonts: %s (%d)" stderr exit-code))
2887 (defun artist-figlet-choose-font ()
2888 "Read any extra arguments for figlet."
2889 (interactive)
2890 (let* ((avail-fonts (artist-figlet-get-font-list))
2891 (font (completing-read (concat "Select font (default "
2892 artist-figlet-default-font
2893 "): ")
2894 (mapcar
2895 (lambda (font) (cons font font))
2896 avail-fonts))))
2897 (if (string= font "") artist-figlet-default-font font)))
2899 (defun artist-figlet-get-extra-args ()
2900 "Read any extra arguments for figlet."
2901 (let ((extra-args (read-string "Extra args to figlet: ")))
2902 (if (string= extra-args "")
2903 nil
2904 extra-args)))
2906 (defun artist-figlet (text)
2907 "Render TEXT using figlet."
2908 (let* ((figlet-font (artist-figlet-choose-font))
2909 (figlet-extra-args (artist-figlet-get-extra-args)))
2910 (artist-figlet-run text figlet-font figlet-extra-args)))
2913 (defun artist-text-insert-common (x y text see-thru)
2914 "At position X, Y, insert text TEXT.
2915 If SEE-THRU is non-nil, then blanks in TEXT do not replace text
2916 in the buffer."
2918 (i 0)
2919 (len (length string-list)))
2920 (while (< i len)
2921 (artist-move-to-xy x (+ y i))
2922 (artist-replace-string (car string-list) see-thru)
2923 (setq string-list (cdr string-list))
2924 (setq i (1+ i)))))
2926 (defun artist-text-insert-see-thru (x y text)
2927 "At position X, Y, insert text TEXT.
2928 Let text already in buffer shine thru the TEXT inserted."
2929 (artist-text-insert-common x y text t))
2931 (defun artist-text-insert-overwrite (x y text)
2932 "At position X, Y, insert text TEXT.
2933 Let blanks in TEXT overwrite any text already in the buffer."
2934 (artist-text-insert-common x y text nil))
2936 (defun artist-text-see-thru (x y)
2937 "Prompt for text to render, render it at X,Y.
2938 This is done by calling the function specified by
2939 `artist-text-renderer-function', which must return a list of strings,
2940 to be inserted in the buffer.
2942 Text already in the buffer ``shines thru'' blanks in the rendered text."
2943 (let* ((input-text (read-string "Type text to render: "))
2944 (rendered-text (artist-funcall artist-text-renderer-function input-text)))
2945 (artist-text-insert-see-thru x y rendered-text)))
2948 (defun artist-text-overwrite (x y)
2949 "Prompt for text to render, render it at X,Y.
2950 This is done by calling the function specified by
2951 `artist-text-renderer-function', which must return a list of strings,
2952 to be inserted in the buffer.
2954 Blanks in the rendered text overwrite any text in the buffer."
2955 (let* ((input-text (read-string "Type text to render: "))
2956 (rendered-text (artist-funcall artist-text-renderer-function input-text)))
2957 (artist-text-insert-overwrite x y rendered-text)))
2959 ;;
2960 ;; Spraying
2961 ;;
2963 (defun artist-spray-get-interval ()
2964 "Retrieve the interval for repeated spray."
2965 artist-spray-interval)
2967 (defun artist-spray-random-points (n radius)
2968 "Generate N random points within a radius of RADIUS.
2969 Returns a list of points. Each point is on the form (X1 . Y1)."
2970 (let ((points))
2971 (while (> n 0)
2972 (let* ((angle (* (random 359) (/ float-pi 180)))
2973 (dist (random radius))
2974 (point (cons (round (* dist (cos angle)))
2975 (round (* dist (sin angle))))))
2976 (setq points (cons point points)))
2977 (setq n (- n 1)))
2978 points))
2980 (defun artist-spray (x1 y1)
2981 "Spray at X1, Y1."
2982 (let* ((num-points (* artist-spray-radius artist-spray-radius))
2983 (spray-points (artist-spray-random-points num-points
2984 artist-spray-radius)))
2985 (while spray-points
2986 ;; Replace one spray point
2987 (let* ((point (car spray-points))
2988 (x (+ x1 (car point)))
2989 (y (+ y1 (cdr point)))
2990 (buf-c (artist-get-char-at-xy-conv x y))
2991 (this-c (memq buf-c artist-spray-chars))
2992 (next-c (cond ((null this-c) artist-spray-new-char)
2993 ((null (cdr this-c)) (car this-c))
2994 (t (car (cdr this-c))))))
2995 (artist-move-to-xy x y)
2996 (artist-replace-char next-c))
2998 ;; Step to next spray point
2999 (setq spray-points (cdr spray-points)))))
3001 (defun artist-spray-clear-circle (circle x1 y1 x2 y2)
3002 "Clear circle CIRCLE at X1, Y1 through X2, Y2."
3003 (artist-undraw-circle circle))
3005 (defun artist-spray-set-radius (circle x1 y1 x2 y2)
3006 "Set spray radius from CIRCLE at X1, Y1 through X2, Y2."
3007 (let ((dx (- x2 x1))
3008 (dy (- y2 y1)))
3009 (setq artist-spray-radius (round (sqrt (+ (* dx dx) (* dy dy)))))
3010 (if (= 0 artist-spray-radius)
3011 (setq artist-spray-radius 1))))
3013 ;;
3014 ;; Erasing
3015 ;;
3017 (defun artist-erase-char (x1 y1)
3018 "Erase a character at X1, Y1.
3019 The character is replaced with the character in `artist-erase-char'."
3020 (artist-move-to-xy x1 y1)
3021 (artist-replace-char artist-erase-char))
3023 (defun artist-erase-rect (rect x1 y1 x2 y2)
3024 "Erase rectangle RECT from X1, Y1, X2, Y2."
3025 (let ((artist-line-char-set t)
3026 (artist-fill-char-set t)
3027 (artist-line-char artist-erase-char)
3028 (artist-fill-char artist-erase-char))
3029 (artist-draw-rect x1 y1 x2 y2)
3030 (artist-fill-rect rect x1 y1 x2 y2)))
3033 ;;
3034 ;; Vaporizing (erasing) line and lines
3035 ;;
3038 (defun artist-vap-find-endpoint (x1 y1 step-x step-y accept-set reject-set)
3039 "Find one endpoint for line through X1, Y1.
3040 The endpoint is searched for in the direction defined by STEP-X, STEP-Y,
3041 accepting characters in the list ACCEPT-SET, stopping immediately
3042 when finding characters in the list REJECT-SET. Fuzziness, that is
3043 the number of consecutive characters not in ACCEPT-SET to allow as
3044 part of the line, is determined by the variable `artist-vaporize-fuzziness'.
3045 An endpoint is a cons pair, (ENDPOINT-X . ENDPOINT-Y)."
3046 (let ((x x1)
3047 (y y1)
3048 (x-last x1)
3049 (y-last y1)
3050 (done nil))
3051 (while (not done)
3052 (let ((c (artist-get-char-at-xy-conv x y)))
3053 (cond ((memq c reject-set)
3054 (setq done t))
3056 ;; We found a character we are accepting as part of the line.
3057 ;; Update position
3058 ((memq c accept-set)
3059 (setq x-last x
3060 y-last y
3061 x (+ x step-x)
3062 y (+ y step-y))
3063 (if (or (< x 0) (< y 0)) ;stop at the edge
3064 (setq done t)))
3066 ;; We found a character we are not accepting as part of
3067 ;; the line Search `artist-vaporize-fuzziness'
3068 ;; characters away from this position in the same
3069 ;; direction to see if there are any characters in the
3070 ;; accept-set. If not, we have found the endpoint.
3071 (t
3072 (let ((fuzziness artist-vaporize-fuzziness)
3073 (x-tmp x)
3074 (y-tmp y))
3076 ;; while we have more fuzziness left and we have not
3077 ;; found a character accepted as a line, move
3078 ;; forward!
3079 (while (and (> fuzziness 0) (not (memq c accept-set)))
3080 (setq x-tmp (+ x-tmp step-x))
3081 (setq y-tmp (+ y-tmp step-y))
3082 (setq c (artist-get-char-at-xy-conv x-tmp y-tmp))
3083 (setq fuzziness (- fuzziness 1)))
3084 (if (memq c accept-set)
3086 ;; The line continues on the other side of the
3087 ;; not-accepted character.
3088 (setq x x-tmp
3089 y y-tmp)
3091 ;; Else: We couldn't find any line on the other side.
3092 ;; That means we are done searching for the endpoint.
3093 (setq done t)))))))
3094 (cons x-last y-last)))
3097 (defun artist-vap-find-endpoints-horiz (x y)
3098 "Find endpoints for a horizontal line through X, Y.
3099 An endpoint is a cons pair, (ENDPOINT-X . ENDPOINT-Y)."
3100 (list (artist-vap-find-endpoint x y 1 0 '(?- ?+) '(?\s))
3101 (artist-vap-find-endpoint x y -1 0 '(?- ?+) '(?\s))))
3103 (defun artist-vap-find-endpoints-vert (x y)
3104 "Find endpoints for a vertical line through X, Y.
3105 An endpoint is a cons pair, (ENDPOINT-X . ENDPOINT-Y)."
3106 (list (artist-vap-find-endpoint x y 0 1 '(?| ?+) '(?\s))
3107 (artist-vap-find-endpoint x y 0 -1 '(?| ?+) '(?\s))))
3109 (defun artist-vap-find-endpoints-swne (x y)
3110 "Find endpoints for a diagonal line (made by /'s) through X, Y.
3111 An endpoint is a cons pair, (ENDPOINT-X . ENDPOINT-Y)."
3112 (list (artist-vap-find-endpoint x y 1 -1 '(?/ ?X) '(?\s))
3113 (artist-vap-find-endpoint x y -1 1 '(?/ ?X) '(?\s))))
3115 (defun artist-vap-find-endpoints-nwse (x y)
3117 An endpoint is a cons pair, (ENDPOINT-X . ENDPOINT-Y)."
3122 (defun artist-vap-find-endpoints (x y)
3123 "Given a point X1, Y1, return a list of endpoints of lines through X, Y.
3124 An endpoint is a cons pair, (ENDPOINT-X . ENDPOINT-Y)."
3125 (if artist-line-char-set
3126 nil
3127 (let ((c (artist-get-char-at-xy-conv x y)))
3128 (cond ((eq c ?-) (artist-vap-find-endpoints-horiz x y))
3129 ((eq c ?|) (artist-vap-find-endpoints-vert x y))
3130 ((eq c ?/) (artist-vap-find-endpoints-swne x y))
3132 ((eq c ?+) (append (artist-vap-find-endpoints-horiz x y)
3133 (artist-vap-find-endpoints-vert x y)))
3134 ((eq c ?X) (append (artist-vap-find-endpoints-swne x y)
3135 (artist-vap-find-endpoints-nwse x y)))
3137 ;; We don't know how to find directions when we are on
3138 ;; another character
3139 (t nil)))))
3142 (defun artist-vap-group-in-pairs (l)
3143 "Group elements in list L in pairs."
3144 (cond ((null l) nil)
3145 ((null (cdr l)) l) ; unevent number of elements in list
3146 (t (append (list (list (car l) (car (cdr l))))
3147 (artist-vap-group-in-pairs (cdr (cdr l)))))))
3149 (defun artist-vaporize-by-endpoints (endpoint1 endpoint2)
3150 "Given ENDPOINT1 and ENDPOINT2, vaporize the line between them.
3151 An endpoint is a pair (X . Y)."
3152 (let* ((x1 (car endpoint1))
3153 (y1 (cdr endpoint1))
3154 (x2 (car endpoint2))
3155 (y2 (cdr endpoint2))
3156 (dir (artist-find-direction x1 y1 x2 y2))
3157 (x-step (aref [1 1 0 -1 -1 -1 0 1] dir))
3158 (y-step (aref [0 1 1 1 0 -1 -1 -1] dir))
3160 (line-len (elt (list (abs (- x2 x1))
3161 (abs (- x2 x1))
3162 (abs (- y2 y1))
3163 (abs (- y2 y1))
3164 (abs (- x1 x2))
3165 (abs (- x1 x2))
3166 (abs (- y1 y2))
3167 (abs (- y1 y2)))
3168 dir))
3169 (x x1)
3170 (y y1))
3171 (while (>= line-len 0)
3172 (let* ((buffer-c (artist-get-char-at-xy-conv x y))
3173 (new-c (artist-unintersection-char line-c buffer-c)))
3174 (artist-move-to-xy x y)
3175 (artist-replace-char new-c))
3176 (setq x (+ x x-step)
3177 y (+ y y-step)
3178 line-len (- line-len 1)))))
3181 (defun artist-vaporize-line (x1 y1)
3182 "Vaporize (erase) the straight line through X1, Y1.
3183 Do this by replacing the characters that forms the line with
3184 `artist-erase-char'. Output is a list of endpoints for lines through
3185 X1, Y1. An endpoint is a cons pair, (ENDPOINT-X . ENDPOINT-Y)."
3186 (let ((endpoints (artist-vap-find-endpoints x1 y1)))
3187 (mapc
3188 (lambda (endpoints)
3189 (let ((ep1 (car endpoints))
3190 (ep2 (car (cdr endpoints))))
3191 (artist-vaporize-by-endpoints ep1 ep2)))
3192 (artist-vap-group-in-pairs endpoints))
3193 endpoints))
3196 ;; Implementation note: This depends on artist-vaporize-line doing
3197 ;; unintersections of intersecting lines.
3198 ;;
3199 ;; Example:
3200 ;; Suppose the buffer looks like this and that we start vaporizing
3201 ;; lines at (3,0) (at the ``*'').
3202 ;;
3203 ;; 0123456
3204 ;; 0+--*--+
3205 ;; 1| |
3206 ;; 2| |
3207 ;; 3+-----+
3208 ;;
3209 ;; We will then push (0,0) and (6,0) on the stack, and vaporize the
3210 ;; topmost horizontal line:
3211 ;;
3212 ;; 0123456
3213 ;; 0| |
3214 ;; 1| |
3215 ;; 2| |
3216 ;; 3+-----+
3217 ;;
3218 ;; We will then pop (0,0) and remove the left-most vertical line while
3219 ;; pushing the lower left corner (0,3) on the stack, and so on until
3220 ;; the entire rectangle is vaporized.
3221 ;;
3222 ;; Now, What if the `+' in the upper left and upper right corners,
3223 ;; had not been changed to `|' but to spaces instead? We would
3224 ;; have failed when popping (0,0) and vaporizing that line because
3225 ;; we wouldn't find any line at (0,0):
3226 ;;
3227 ;; 0123456
3228 ;; 0
3229 ;; 1| |
3230 ;; 2| |
3231 ;; 3+-----+
3232 ;;
3233 ;; That's why we depend on artist-vaporize-line doing unintersecting
3234 ;; of crossing lines. There are alternative ways to handle this
3235 ;; if it becomes too much a trouble.
3236 ;;
3237 (defun artist-vaporize-lines (x1 y1)
3238 "Vaporize lines reachable from point X1, Y1."
3239 (let ((ep-stack nil))
3240 (mapc
3241 (lambda (ep) (push ep ep-stack))
3242 (artist-vap-find-endpoints x1 y1))
3243 (while (not (null ep-stack))
3244 (let* ((vaporize-point (pop ep-stack))
3245 (new-endpoints (artist-vaporize-line (car vaporize-point)
3246 (cdr vaporize-point))))
3247 (mapc
3248 (lambda (endpoint) (push endpoint ep-stack))
3249 new-endpoints)))))
3252 ;;
3253 ;; Circles and ellipses
3254 ;;
3255 (defun artist-ellipse-generate-quadrant (x-radius y-radius)
3256 "Create a point-list for first quadrant.
3257 Points go from (X-RADIUS, 0) to (0, Y-RADIUS).
3258 Quadrant is generated around origin."
3259 (let* ((rx2 (* x-radius x-radius))
3260 (ry2 (* y-radius y-radius))
3261 (2rx2 (* 2 rx2))
3262 (2ry2 (* 2 ry2))
3263 (p)
3264 (x 0)
3265 (y y-radius)
3266 (px 0)
3267 (py (* 2rx2 y))
3268 (point-list nil))
3269 (artist-put-pixel point-list x y)
3270 (setq p (round (+ ry2 (- (* rx2 y-radius)) (* 0.25 rx2))))
3271 (while (< px py)
3272 (setq x (1+ x)
3273 px (+ px 2ry2))
3274 (if (< p 0)
3275 (setq p (+ p ry2 px))
3276 (setq y (- y 1)
3277 py (- py 2rx2)
3278 p (+ p ry2 px (- py))))
3279 (artist-put-pixel point-list x y))
3280 (setq p (round (+ (* ry2 (+ x 0.5) (+ x 0.5))
3281 (* rx2 (- y 1) (- y 1))
3282 (- (* rx2 ry2)))))
3283 (while (> y 0)
3284 (setq y (- y 1)
3285 py (- py 2rx2))
3286 (if (> p 0)
3287 (setq p (+ p rx2 (- py)))
3288 (setq x (1+ x)
3289 px (+ px 2ry2)
3290 p (+ p rx2 (- py) px)))
3291 (artist-put-pixel point-list x y))
3292 point-list))
3294 (defsubst artist-new-fill-item (x y width)
3295 "Create a new item at X, Y, with WIDTH.
3296 This is for use in fill-info in ellipses and circles."
3297 (let ((new-item (make-vector 3 x)))
3298 (aset new-item 1 y)
3299 (aset new-item 2 width)
3300 new-item))
3302 (defsubst artist-fill-item-get-x (fill-item)
3303 "Retrieve the x component of a FILL-ITEM."
3304 (aref fill-item 0))
3306 (defsubst artist-fill-item-set-x (fill-item new-x)
3307 "Set the x component of a FILL-ITEM to NEW-X."
3308 (aset fill-item 0 new-x)
3309 fill-item)
3311 (defsubst artist-fill-item-get-y (fill-item)
3312 "Retrieve the y component of a FILL-ITEM."
3313 (aref fill-item 1))
3315 (defsubst artist-fill-item-set-y (fill-item new-y)
3316 "Set the y component of a FILL-ITEM to NEW-Y."
3317 (aset fill-item 1 new-y)
3318 fill-item)
3320 (defsubst artist-fill-item-get-width (fill-item)
3321 "Retrieve the width component of a FILL-ITEM."
3322 (aref fill-item 2))
3324 (defsubst artist-fill-item-set-width (fill-item new-width)
3325 "Set the width component of a FILL-ITEM to NEW-WIDTH."
3326 (aset fill-item 2 new-width)
3327 fill-item)
3330 (defun artist-ellipse-point-list-add-center (x-center y-center point-list)
3331 "Add offsets X-CENTER and Y-CENTER to coordinates in POINT-LIST."
3332 (mapcar
3333 (lambda (p)
3334 (artist-coord-set-x p (+ x-center (artist-coord-get-x p)))
3335 (artist-coord-set-y p (+ y-center (artist-coord-get-y p))))
3336 point-list))
3339 (defun artist-ellipse-fill-info-add-center (x-center y-center fill-info)
3340 "Add offsets X-CENTER and Y-CENTER to fill-items in FILL-INFO."
3341 (mapcar
3342 (lambda (p)
3343 (artist-fill-item-set-x p (+ x-center (artist-fill-item-get-x p)))
3344 (artist-fill-item-set-y p (+ y-center (artist-fill-item-get-y p))))
3345 fill-info))
3347 (defun artist-ellipse-remove-0-fills (fill-info)
3348 "Remove fill-infos from FILL-INFO that fills a zero-width field."
3349 (cond ((null fill-info)
3350 nil)
3351 ((= 0 (artist-fill-item-get-width (car fill-info)))
3352 (artist-ellipse-remove-0-fills (cdr fill-info)))
3353 (t
3354 (append (list (car fill-info))
3355 (artist-ellipse-remove-0-fills (cdr fill-info))))))
3358 (defun artist-ellipse-compute-fill-info (point-list)
3359 "Compute fill info for ellipse around 0,0 from POINT-LIST.
3360 The POINT-LIST is expected to cover the first quadrant."
3361 (let ((first-half nil)
3362 (both-halves nil)
3363 (last-y nil))
3365 ;; Create first half (the lower one (since y grows downwards)) from
3366 ;; the first quadrant.
3367 (mapc
3368 (lambda (coord)
3369 (let* ((x (artist-coord-get-x coord))
3370 (y (artist-coord-get-y coord))
3371 (width (max (- (* 2 x) 1) 0))
3372 (left-edge (- x width)))
3373 (if (or (null last-y) (not (= y last-y)))
3374 ;; This was either the first time,
3375 ;; or it was the first time on a new line
3376 (setq first-half
3377 (append first-half
3378 ;; Fill info item starts at left-edge on line y
3379 (list (artist-new-fill-item left-edge y width)))))
3380 (setq last-y y)))
3381 point-list)
3383 ;; Create the other half by mirroring the first half.
3384 (setq both-halves
3385 (append first-half
3386 (mapc
3387 (lambda (i)
3388 (artist-new-fill-item (artist-fill-item-get-x i)
3389 (- (artist-fill-item-get-y i))
3390 (artist-fill-item-get-width i)))
3391 ;; The cdr below is so we don't include fill-info for
3392 ;;; the middle line twice
3393 (cdr (reverse first-half)))))
3394 (artist-ellipse-remove-0-fills both-halves)))
3397 (defun artist-ellipse-mirror-quadrant (point-list)
3398 "Mirror a POINT-LIST describing first quadrant to create a complete ellipse."
3399 (let ((right-half nil)
3400 (left-half nil))
3402 ;; First, if last char in that quadrant is `/', then replace it with `)'
3403 ;; This way we avoids things
3404 ;; --------- ---------
3405 ;; / \ / \
3406 ;; that look like: \ / instead we get: ( )
3407 ;; \ / \ /
3408 ;; --------- ---------
3409 (let ((last-coord (car (last point-list))))
3410 (if (= (artist-coord-get-new-char last-coord) ?/)
3411 (artist-coord-set-new-char last-coord artist-ellipse-right-char)))
3413 ;; Create the other part of the right half by mirroring the first part
3414 (setq right-half
3415 (append
3416 point-list
3417 (mapcar
3418 (lambda (coord)
3419 (let ((c (artist-coord-get-new-char coord)))
3420 (artist-new-coord (artist-coord-get-x coord)
3421 (- (artist-coord-get-y coord))
3424 (t c)))))
3425 ;; The cdr below is so we don't draw the middle right char twice
3426 (cdr (reverse point-list)))))
3428 ;; Create the left half by mirroring the right half.
3429 (setq left-half
3430 (mapcar
3431 (lambda (coord)
3432 (let ((c (artist-coord-get-new-char coord)))
3433 (artist-new-coord (- (artist-coord-get-x coord))
3434 (artist-coord-get-y coord)
3437 ((= c artist-ellipse-right-char)
3438 artist-ellipse-left-char)
3439 (t c)))))
3440 ;; The cdr and butlast below is so we don't draw the middle top
3441 ;; and middle bottom char twice.
3442 (butlast (cdr (reverse right-half)))))
3443 (append right-half left-half)))
3446 (defun artist-draw-ellipse-general (x1 y1 x-radius y-radius)
3447 "Draw an ellipse with center at X1, Y1 and X-RADIUS and Y-RADIUS.
3449 Output is an ellipse, which is a list (END-POINT-1 END-POINT-2 SHAPE-INFO).
3451 END-POINT-1 and END-POINT-2 are two-element vectors on the form [X Y].
3452 SHAPE-INFO is a two-element vector on the form [POINT-LIST FILL-INFO].
3454 POINT-LIST is a list of vectors on the form [X Y SAVED-CHAR NEW-CHAR].
3455 FILL-INFO is a list of vectors on the form [X Y ELLIPSE-WIDTH-ON-THIS-LINE].
3457 Ellipses with zero Y-RADIUS are not drawn correctly."
3458 (let* ((point-list (artist-ellipse-generate-quadrant x-radius y-radius))
3459 (fill-info (artist-ellipse-compute-fill-info point-list))
3460 (shape-info (make-vector 2 0)))
3462 (setq point-list (artist-calculate-new-chars point-list))
3463 (setq point-list (artist-ellipse-mirror-quadrant point-list))
3464 (setq point-list (artist-ellipse-point-list-add-center x1 y1 point-list))
3465 (setq fill-info (artist-ellipse-fill-info-add-center x1 y1 fill-info))
3467 ;; Draw the ellipse
3468 (setq point-list
3469 (mapcar
3470 (lambda (coord)
3471 (artist-move-to-xy (artist-coord-get-x coord)
3472 (artist-coord-get-y coord))
3473 (if artist-line-char-set
3474 (artist-replace-char artist-line-char)
3475 (artist-replace-char (artist-coord-get-new-char coord)))
3476 coord)
3477 (artist-modify-new-chars
3478 (artist-save-chars-under-point-list point-list))))
3480 (aset shape-info 0 point-list)
3481 (aset shape-info 1 fill-info)
3482 (artist-make-2point-object (artist-make-endpoint x1 y1)
3483 (artist-make-endpoint x-radius y-radius)
3484 shape-info)))
3486 (defun artist-draw-ellipse-with-0-height (x1 y1 x-radius y-radius)
3487 "Draw an ellipse with center at X1, Y1 and X-RADIUS and Y-RADIUS.
3489 Output is an ellipse, which is a list (END-POINT-1 END-POINT-2 SHAPE-INFO).
3491 END-POINT-1 and END-POINT-2 are two-element vectors on the form [X Y].
3492 SHAPE-INFO is a two-element vector on the form [POINT-LIST FILL-INFO].
3494 POINT-LIST is a list of vectors on the form [X Y SAVED-CHAR NEW-CHAR].
3495 FILL-INFO is a list of vectors on the form [X Y ELLIPSE-WIDTH-ON-THIS-LINE].
3497 The Y-RADIUS must be 0, but the X-RADIUS must not be 0."
3498 (let ((point-list nil)
3499 (width (max (- (abs (* 2 x-radius)) 1)))
3500 (left-edge (1+ (- x1 (abs x-radius))))
3501 (line-char (if artist-line-char-set artist-line-char ?-))
3502 (i 0)
3503 (point-list nil)
3504 (fill-info nil)
3505 (shape-info (make-vector 2 0)))
3506 (while (< i width)
3507 (let* ((line-x (+ left-edge i))
3508 (line-y y1)
3509 (new-coord (artist-new-coord line-x line-y)))
3510 (artist-coord-add-saved-char new-coord
3511 (artist-get-char-at-xy line-x line-y))
3512 (artist-move-to-xy line-x line-y)
3513 (artist-replace-char line-char)
3514 (setq point-list (append point-list (list new-coord)))
3515 (setq i (1+ i))))
3516 (aset shape-info 0 point-list)
3517 (aset shape-info 1 fill-info)
3518 (artist-make-2point-object (artist-make-endpoint x1 y1)
3519 (artist-make-endpoint x-radius y-radius)
3520 shape-info)))
3522 (defun artist-draw-ellipse (x1 y1 x2 y2)
3523 "Draw an ellipse with center at X1, Y1 and point X2,Y2.
3525 Output is an ellipse, which is a list (END-POINT-1 END-POINT-2 SHAPE-INFO).
3527 END-POINT-1 and END-POINT-2 are two-element vectors on the form [X Y].
3528 SHAPE-INFO is a two-element vector on the form [POINT-LIST FILL-INFO].
3530 POINT-LIST is a list of vectors on the form [X Y SAVED-CHAR NEW-CHAR].
3531 FILL-INFO is a list of vectors on the form [X Y ELLIPSE-WIDTH-ON-THIS-LINE]."
3532 (let* ((artist-line-char (artist-compute-line-char))
3533 (artist-line-char-set artist-line-char)
3534 (width (abs (- x2 x1)))
3535 (height (abs (- y2 y1)))
3536 ;;
3537 ;; When we draw our ellipse, we want it to go through the cursor
3538 ;; position, but since x1,y1, x2,y2 marks the corners of one
3539 ;; of the quadrants, we have to enlarge the ellipse a bit.
3540 ;; Ok, so then why by sqrt(2)?
3541 ;; It comes from the equation for the ellipse (where a is the
3542 ;; x-radius and b is the y-radius):
3543 ;; f(x,y) = x^2 / a^2 + y^2 / b^2 - 1 = 0
3544 ;; and the fact that we want the enlarged ellipse to have the
3545 ;; same proportions as the smaller square, therefore we have:
3546 ;; a/b = x/y
3547 ;; Solving this yields a-in-larger-ellipse = a-in-smaller * sqrt(2)
3548 (x-radius (round (* width (sqrt 2))))
3549 (y-radius (round (* height (sqrt 2))))
3550 (x x1)
3551 (y y1))
3552 (if (and (= y1 y2) (not (= x1 x2)))
3553 (artist-draw-ellipse-with-0-height x y x-radius y-radius)
3554 (artist-draw-ellipse-general x y x-radius y-radius))))
3557 (defun artist-undraw-ellipse (ellipse)
3558 "Undraw ELLIPSE."
3559 (if ellipse
3560 (let ((point-list (aref (artist-2point-get-shapeinfo ellipse) 0)))
3561 (mapcar
3562 (lambda (coord)
3563 (artist-move-to-xy (artist-coord-get-x coord)
3564 (artist-coord-get-y coord))
3565 (artist-replace-char (artist-coord-get-saved-char coord))
3566 coord)
3567 point-list))))
3570 (defun artist-draw-circle (x1 y1 x2 y2)
3571 "Draw a circle with center at X1, Y1 and point X2,Y2.
3573 Output is an ellipse, which is a list (END-POINT-1 END-POINT-2 SHAPE-INFO).
3575 END-POINT-1 and END-POINT-2 are two-element vectors on the form [X Y].
3576 SHAPE-INFO is a two-element vector on the form [POINT-LIST FILL-INFO].
3578 POINT-LIST is a list of vectors on the form [X Y SAVED-CHAR NEW-CHAR].
3579 FILL-INFO is a list of vectors on the form [X Y ELLIPSE-WIDTH-ON-THIS-LINE]."
3580 (let* ((artist-line-char (artist-compute-line-char))
3581 (artist-line-char-set artist-line-char)
3582 (width (abs (- x2 x1)))
3583 (height (abs (- y2 y1)))
3584 ;; When drawing our circle, we want it to through the cursor
3585 ;; just as when drawing the ellipse, but we have to take
3586 ;; care for the aspect-ratio.
3587 ;; The equation for the ellipse (where a is the x-radius and
3588 ;; b is the y-radius):
3589 ;; f(x,y) = x^2 / a^2 + y^2 / b^2 - 1 = 0
3590 ;; together with the relationship
3591 ;; a = aspect-ratio * b
3592 ;; gives
3593 ;; a = sqrt( x^2 + (aspect-ratio * y)^2 ) and
3594 ;; b = a / aspect-ratio
3595 (x-radius (round (sqrt (+ (* width width)
3596 (* (* artist-aspect-ratio height)
3597 (* artist-aspect-ratio height))))))
3598 (y-radius (round (/ x-radius artist-aspect-ratio))))
3599 (artist-draw-ellipse-general x1 y1 x-radius y-radius)))
3601 (defalias 'artist-undraw-circle 'artist-undraw-ellipse)
3604 ;
3605 ; Filling ellipses
3606 ;
3607 (defun artist-fill-ellipse (ellipse x y x-radius y-radius)
3608 "Fill an ELLIPSE centered at X,Y with radius X-RADIUS and Y-RADIUS."
3609 (let ((fill-info (aref (artist-2point-get-shapeinfo ellipse) 1)))
3610 (mapcar
3611 (lambda (fill-item)
3612 (artist-move-to-xy (artist-fill-item-get-x fill-item)
3613 (artist-fill-item-get-y fill-item))
3614 (artist-replace-chars artist-fill-char
3615 (artist-fill-item-get-width fill-item))
3616 fill-item)
3617 fill-info)))
3619 (defalias 'artist-fill-circle 'artist-fill-ellipse)
3622 ;;
3623 ;; Cutting, copying and pasting rectangles and squares
3624 ;; (filling functions)
3625 ;;
3627 (defun artist-cut-rect (rect x1 y1 x2 y2)
3628 "Copy rectangle RECT drawn from X1, Y1 to X2, Y2, then clear it."
3629 (artist-undraw-rect rect)
3630 (artist-copy-generic x1 y1 x2 y2)
3631 (artist-erase-rect rect x1 y1 x2 y2))
3633 (defun artist-cut-square (square x1 y1 x2 y2)
3634 "Copy a SQUARE drawn from X1, Y1 to X2, Y2 (made square), then clears it."
3635 (artist-undraw-square square)
3636 (let* ((square-corners (artist-rect-corners-squarify x1 y1 x2 y2))
3637 (new-x1 (elt square-corners 0))
3638 (new-y1 (elt square-corners 1))
3639 (new-x2 (elt square-corners 2))
3640 (new-y2 (elt square-corners 3)))
3641 (artist-copy-generic new-x1 new-y1 new-x2 new-y2)
3642 (artist-erase-rect square new-x1 new-y1 new-x2 new-y2)))
3645 (defun artist-get-buffer-contents-at-xy (x y width)
3646 "Retrieve contents from the buffer at X, Y. WIDTH characters are returned."
3647 (artist-move-to-xy x y)
3648 (let ((here (point))
3649 (there (save-excursion (artist-move-to-xy (+ x width) y) (point))))
3650 (untabify here there)
3651 (setq there (save-excursion (artist-move-to-xy (+ x width) y) (point)))
3652 (buffer-substring here there)))
3655 (defun artist-copy-generic (x1 y1 x2 y2)
3656 "Copy a rectangular area with corners at X1, Y1 and X2, Y2.
3657 Output is a copy buffer, a list of strings, representing the
3658 original contents of that area in the buffer."
3659 (let* ((x (min x1 x2))
3660 (y (min y1 y2))
3661 (x-max (max x1 x2))
3662 (y-max (max y1 y2))
3663 (w (+ (- x-max x) 1))
3664 (l nil))
3665 (while (<= y y-max)
3666 (setq l (cons (artist-get-buffer-contents-at-xy x y w) l))
3667 (setq y (1+ y)))
3668 (if artist-interface-with-rect
3669 (setq killed-rectangle (reverse l))
3670 (setq artist-copy-buffer (reverse l)))))
3673 (defun artist-copy-rect (rect x1 y1 x2 y2)
3674 "Copy rectangle RECT drawn from X1, Y1 to X2, Y2."
3675 (artist-undraw-rect rect)
3676 (artist-copy-generic x1 y1 x2 y2))
3678 (defun artist-copy-square (square x1 y1 x2 y2)
3679 "Copy a SQUARE drawn from X1, Y1 to X2, Y2 (but made square)."
3680 (artist-undraw-square square)
3681 (let* ((square-corners (artist-rect-corners-squarify x1 y1 x2 y2))
3682 (new-x1 (elt square-corners 0))
3683 (new-y1 (elt square-corners 1))
3684 (new-x2 (elt square-corners 2))
3685 (new-y2 (elt square-corners 3)))
3686 (artist-copy-generic new-x1 new-y1 new-x2 new-y2)))
3688 (defun artist-paste (x y)
3689 "Paste the contents of the copy-buffer at X,Y."
3690 (let ((copy-buf (if artist-interface-with-rect
3691 killed-rectangle
3692 artist-copy-buffer)))
3693 (if (not (null copy-buf))
3694 (while (not (null copy-buf))
3695 (artist-move-to-xy x y)
3696 (artist-replace-string (car copy-buf))
3697 (setq copy-buf (cdr copy-buf))
3698 (setq y (1+ y)))
3699 (message "Nothing to paste"))))
3702 ;;
3703 ;; Flood filling
3704 ;;
3705 (defun artist-ff-too-far-right (x)
3706 "Determine if the position X is too far to the right."
3707 (cond ((numberp artist-flood-fill-right-border)
3708 (> x artist-flood-fill-right-border))
3709 ((eq artist-flood-fill-right-border 'window-width)
3710 (> x (- (window-width) 2)))
3711 ((eq artist-flood-fill-right-border 'fill-column)
3712 (> x fill-column))
3713 (t (error "Invalid value for `artist-flood-fill-right-border'"))))
3715 (defun artist-ff-get-rightmost-from-xy (x y)
3716 "Find the rightmost position in this run, starting at X, Y."
3717 (save-excursion
3718 (let ((char-at-xy (artist-get-char-at-xy-conv x y))
3719 (last-x x))
3720 (setq x (1+ x))
3721 (while (and (not (artist-ff-too-far-right x))
3722 (= char-at-xy (artist-get-char-at-xy-conv x y)))
3723 (setq last-x x)
3724 (setq x (1+ x)))
3725 last-x)))
3727 (defun artist-ff-is-topmost-line (x y)
3728 "Determine whether the position X,Y is on the topmost line or not."
3729 (= y 0))
3731 (defun artist-ff-is-bottommost-line (x y)
3732 "Determine whether the position X,Y is on the bottommost line or not."
3733 (save-excursion
3734 (goto-char (point-max))
3735 (beginning-of-line)
3736 (let ((last-line (artist-current-line)))
3737 (if (= (point) (point-max))
3739 ;; Last line is empty, don't paint on it, report previous line
3740 ;; as last line
3741 (>= y (- last-line 1))
3742 (>= y last-line)))))
3744 (defun artist-flood-fill (x1 y1)
3745 "Flood-fill starting at X1, Y1. Fill with the char in `artist-fill-char'."
3746 (let ((stack nil)
3747 (input-queue nil)
3748 ;; We are flood-filling the area that has this character.
3749 (c (artist-get-char-at-xy-conv x1 y1))
3750 (artist-fill-char (if artist-fill-char-set
3751 artist-fill-char
3752 artist-default-fill-char)))
3754 ;; Fill only if the fill-char is not the same as the character whose
3755 ;; area we are about to fill, or, in other words, don't fill if we
3756 ;; needn't.
3757 (if (not (= c artist-fill-char))
3758 (push (artist-new-coord x1 y1) stack))
3760 (while (not (null stack))
3761 (let* ((coord (pop stack))
3762 (x (artist-coord-get-x coord))
3763 (y (artist-coord-get-y coord))
3765 ;; Here we keep track of the leftmost and rightmost position
3766 ;; for this run
3767 (x-leftmost 0)
3768 (x-rightmost 0)
3769 (last-x 0)
3771 ;; Remember if line above and below are accessible
3772 ;; Lines below the last one, and prior to the first-one
3773 ;; are not accessible.
3774 (lines-above nil)
3775 (lines-below nil)
3777 ;; Remember char for position on line above and below, so we
3778 ;; can find the rightmost positions on the runs.
3779 (last-c-above -1)
3780 (last-c-below -1))
3782 (setq x-rightmost (artist-ff-get-rightmost-from-xy x y))
3783 (setq lines-above (not (artist-ff-is-topmost-line x y)))
3784 (setq lines-below (not (artist-ff-is-bottommost-line x y)))
3785 (setq last-x x-rightmost)
3786 (setq x x-rightmost)
3788 ;; Search line above, push rightmost positions of runs for that line
3789 (while (and (>= x 0) (= c (artist-get-char-at-xy-conv x y)))
3790 (if lines-above
3791 (let ((c-above (artist-get-char-at-xy-conv x (- y 1))))
3792 (if (and (= c-above c) (/= c-above last-c-above))
3793 (push (artist-new-coord x (- y 1)) stack))
3794 (setq last-c-above c-above)))
3795 (setq last-x x)
3796 (setq x (- x 1)))
3798 ;; Remember the left-most position on this run
3799 (setq x-leftmost last-x)
3801 ;; Search line below, push rightmost positions of runs for that line
3802 (setq x x-rightmost)
3803 (while (>= x x-leftmost)
3804 (if lines-below
3805 (let ((c-below (artist-get-char-at-xy-conv x (1+ y))))
3806 (if (and (= c-below c) (/= c-below last-c-below))
3807 (push (artist-new-coord x (1+ y)) stack))
3808 (setq last-c-below c-below)))
3809 (setq x (- x 1)))
3811 (artist-move-to-xy x-leftmost y)
3812 (artist-replace-chars artist-fill-char (1+ (- x-rightmost x-leftmost)))
3814 ;; If we are to show incrementally, we have to remove any pending
3815 ;; input from the input queue, because processing of pending input
3816 ;; always has priority over display updates (although this input
3817 ;; won't be processed until we are done). Later on we will queue
3818 ;; the input on the input queue again.
3819 (if artist-flood-fill-show-incrementally
3820 (progn
3821 (if (input-pending-p)
3822 (discard-input))
3823 (artist-update-display)))))))
3825 ;;
3826 ;; Accessors to arrow-points
3827 ;;
3829 (defun artist-make-arrow-point (x y direction &optional state)
3830 "Create an arrow point at X, Y for a line in direction DIRECTION.
3831 Optional argument STATE can be used to set state (default is nil)."
3832 (save-excursion
3833 (let* ((arrow-point (make-vector 4 0))
3834 (arrow-marker (make-marker)))
3835 (artist-move-to-xy x y)
3836 (set-marker arrow-marker (point))
3837 (aset arrow-point 0 arrow-marker)
3838 (aset arrow-point 1 (artist-get-char-at-xy x y))
3839 (aset arrow-point 2 direction)
3840 (aset arrow-point 3 state)
3841 arrow-point)))
3843 (defsubst artist-arrow-point-get-marker (arrow-point)
3844 "Retrieve the marker component of an ARROW-POINT."
3845 (aref arrow-point 0))
3847 (defsubst artist-arrow-point-get-orig-char (arrow-point)
3848 "Retrieve the orig char component of an ARROW-POINT."
3849 (aref arrow-point 1))
3851 (defsubst artist-arrow-point-get-direction (arrow-point)
3852 "Retrieve the direction component of an ARROW-POINT."
3853 (aref arrow-point 2))
3855 (defsubst artist-arrow-point-get-state (arrow-point)
3856 "Retrieve the state component of an ARROW-POINT."
3857 (aref arrow-point 3))
3859 (defsubst artist-arrow-point-set-state (arrow-point new-state)
3860 "Set the state component of an ARROW-POINT to NEW-STATE."
3861 (aset arrow-point 3 new-state))
3864 (defun artist-clear-arrow-points ()
3865 "Clear current endpoints."
3866 (setq artist-arrow-point-1 nil)
3867 (setq artist-arrow-point-2 nil))
3869 (defun artist-set-arrow-points-for-poly (point-list)
3870 "Generic function for setting arrow-points for poly-shapes from POINT-LIST."
3871 (let* ((ep1 (elt point-list 0))
3872 (ep2 (elt point-list 1))
3873 (x1 (artist-endpoint-get-x ep1))
3874 (y1 (artist-endpoint-get-y ep1))
3875 (x2 (artist-endpoint-get-x ep2))
3876 (y2 (artist-endpoint-get-y ep2))
3877 (dir1 (artist-find-direction x2 y2 x1 y1))
3878 (epn (car (last point-list)))
3879 (epn-1 (car (last point-list 2)))
3880 (xn (artist-endpoint-get-x epn))
3881 (yn (artist-endpoint-get-y epn))
3882 (xn-1 (artist-endpoint-get-x epn-1))
3883 (yn-1 (artist-endpoint-get-y epn-1))
3884 (dirn (artist-find-direction xn-1 yn-1 xn yn)))
3885 (setq artist-arrow-point-1 (artist-make-arrow-point x1 y1 dir1))
3886 (setq artist-arrow-point-2 (artist-make-arrow-point xn yn dirn))))
3889 (defun artist-set-arrow-points-for-2points (shape x1 y1 x2 y2)
3890 "Generic function for setting arrow-points for 2-point shapes.
3891 The 2-point shape SHAPE is drawn from X1, Y1 to X2, Y2."
3892 (let* ((endpoint1 (artist-2point-get-endpoint1 shape))
3893 (endpoint2 (artist-2point-get-endpoint2 shape))
3894 (x1 (artist-endpoint-get-x endpoint1))
3895 (y1 (artist-endpoint-get-y endpoint1))
3896 (x2 (artist-endpoint-get-x endpoint2))
3897 (y2 (artist-endpoint-get-y endpoint2)))
3898 (setq artist-arrow-point-1
3899 (artist-make-arrow-point x1 y1
3900 (artist-find-direction x2 y2 x1 y1)))
3901 (setq artist-arrow-point-2
3902 (artist-make-arrow-point x2 y2
3903 (artist-find-direction x1 y1 x2 y2)))))
3906 ;;
3907 ;; Common routine for drawing/undrawing shapes based
3908 ;; on the draw-how
3909 ;;
3911 (defun artist-key-undraw-continously (x y)
3912 "Undraw current continuous shape with point at X, Y."
3913 ;; No undraw-info for continuous shapes
3914 nil)
3916 (defun artist-key-undraw-poly (x y)
3917 "Undraw current poly shape with point at X, Y."
3918 (let ((undraw-fn (artist-go-get-undraw-fn-from-symbol artist-curr-go))
3919 (x1 (artist-endpoint-get-x artist-key-endpoint1))
3920 (y1 (artist-endpoint-get-y artist-key-endpoint1)))
3921 (artist-funcall undraw-fn artist-key-shape)))
3923 (defun artist-key-undraw-1point (x y)
3924 "Undraw current 1-point shape at X, Y."
3925 ;; No undraw-info for 1-point shapes
3926 nil)
3928 (defun artist-key-undraw-2points (x y)
3929 "Undraw current 2-point shape at X, Y."
3930 (let ((undraw-fn (artist-go-get-undraw-fn-from-symbol artist-curr-go))
3931 (x1 (artist-endpoint-get-x artist-key-endpoint1))
3932 (y1 (artist-endpoint-get-y artist-key-endpoint1)))
3933 (artist-funcall undraw-fn artist-key-shape)))
3935 (defun artist-key-undraw-common ()
3936 "Common routine undrawing current shape."
3937 (let ((draw-how (artist-go-get-draw-how-from-symbol artist-curr-go))
3938 (col (artist-current-column))
3939 (row (artist-current-line)))
3941 ;; Depending on what we are currently drawing, call other routines
3942 ;; that knows how to do the job
3943 ;;
3944 (cond ((eq draw-how 'artist-do-continously)
3945 (artist-key-undraw-continously col row))
3946 ((eq draw-how 'artist-do-poly)
3947 (artist-key-undraw-poly col row))
3948 ((and (numberp draw-how) (= draw-how 1))
3949 (artist-key-undraw-1point col row))
3950 ((and (numberp draw-how) (= draw-how 2))
3951 (artist-key-undraw-2points col row))
3954 ;; Now restore the old position
3955 ;;
3956 (artist-move-to-xy col row)))
3960 ;; Implementation note: This really should honor the interval-fn entry
3961 ;; in the master table, `artist-mt', which would mean leaving a timer
3962 ;; that calls `draw-fn' every now and then. That timer would then have
3963 ;; to be canceled and reinstalled whenever the user moves the cursor.
3964 ;; This could be done, but what if the user suddenly switches to another
3965 ;; drawing mode, or even kills the buffer! In the mouse case, it is much
3966 ;; simpler: when at the end of `artist-mouse-draw-continously', the
3967 ;; user has released the button, so the timer will always be canceled
3968 ;; at that point.
3969 (defun artist-key-draw-continously (x y)
3970 "Draw current continuous shape at X,Y."
3971 (let ((draw-fn (artist-go-get-draw-fn-from-symbol artist-curr-go)))
3972 (setq artist-key-shape (artist-funcall draw-fn x y))))
3974 (defun artist-key-draw-poly (x y)
3975 "Draw current poly-point shape with nth point at X,Y."
3976 (let ((draw-fn (artist-go-get-draw-fn-from-symbol artist-curr-go))
3977 (x1 (artist-endpoint-get-x artist-key-endpoint1))
3978 (y1 (artist-endpoint-get-y artist-key-endpoint1)))
3979 (setq artist-key-shape (artist-funcall draw-fn x1 y1 x y))))
3981 (defun artist-key-draw-1point (x y)
3982 "Draw current 1-point shape at X,Y."
3983 (let ((draw-fn (artist-go-get-draw-fn-from-symbol artist-curr-go)))
3984 (setq artist-key-shape (artist-funcall draw-fn x y))))
3987 (defun artist-key-draw-2points (x y)
3988 "Draw current 2-point shape at X,Y."
3989 (let ((draw-fn (artist-go-get-draw-fn-from-symbol artist-curr-go))
3990 (x1 (artist-endpoint-get-x artist-key-endpoint1))
3991 (y1 (artist-endpoint-get-y artist-key-endpoint1)))
3992 (setq artist-key-shape (artist-funcall draw-fn x1 y1 x y))))
3994 (defun artist-key-draw-common ()
3995 "Common routine for drawing current shape."
3996 (let ((draw-how (artist-go-get-draw-how-from-symbol artist-curr-go))
3997 (col (artist-current-column))
3998 (row (artist-current-line)))
4000 ;; Depending on what we are currently drawing, call other routines
4001 ;; that knows how to do the job
4002 ;;
4003 (cond ((eq draw-how 'artist-do-continously)
4004 (artist-key-draw-continously col row))
4005 ((eq draw-how 'artist-do-poly)
4006 (artist-key-draw-poly col row))
4007 ((and (numberp draw-how) (= draw-how 1))
4008 (artist-key-draw-1point col row))
4009 ((and (numberp draw-how) (= draw-how 2))
4010 (artist-key-draw-2points col row))
4013 ;; Now restore the old position
4014 ;;
4015 (artist-move-to-xy col row)))
4019 ;;
4020 ;; Functions related to trimming line-endings
4021 ;; The region between the topmost and bottommost visited line is
4022 ;; called a draw-region.
4023 ;;
4025 (defun artist-draw-region-reset ()
4026 "Reset the current draw-region."
4027 (setq artist-draw-region-max-y 0)
4028 (setq artist-draw-region-min-y 1000000))
4030 (defun artist-draw-region-trim-line-endings (min-y max-y)
4031 "Trim lines in current draw-region from MIN-Y to MAX-Y.
4032 Trimming here means removing white space at end of a line."
4033 ;; Safety check: switch min-y and max-y if max-y is smaller
4034 (if (< max-y min-y)
4035 (let ((tmp min-y))
4036 (setq min-y max-y)
4037 (setq max-y tmp)))
4038 (save-excursion
4039 (let ((curr-y min-y))
4040 (while (<= curr-y max-y)
4041 (artist-move-to-xy 0 curr-y)
4042 (end-of-line)
4043 (delete-horizontal-space)
4044 (setq curr-y (1+ curr-y))))))
4046 ;;
4047 ;; Drawing shapes by using keys
4048 ;;
4050 (defun artist-key-do-continously-continously (x y)
4051 "Update current continuous shape at X,Y."
4052 (let ((draw-fn (artist-go-get-draw-fn-from-symbol artist-curr-go)))
4053 (artist-funcall draw-fn x y)))
4056 (defun artist-key-do-continously-poly (x y)
4057 "Update current poly-point shape with nth point at X,Y."
4058 (let ((draw-fn (artist-go-get-draw-fn-from-symbol artist-curr-go))
4059 (undraw-fn (artist-go-get-undraw-fn-from-symbol artist-curr-go))
4060 (x1 (artist-endpoint-get-x artist-key-endpoint1))
4061 (y1 (artist-endpoint-get-y artist-key-endpoint1))
4062 (x2 x)
4063 (y2 y))
4064 ;; If not rubber-banding, then move the 2
4065 ;; Otherwise re-draw the shape to the new position
4066 ;;
4067 (if (not artist-rubber-banding)
4068 (progn
4069 (artist-no-rb-unset-point2)
4070 (artist-no-rb-set-point2 x y))
4071 (progn
4072 (artist-funcall undraw-fn artist-key-shape)
4073 (setq artist-key-shape (artist-funcall draw-fn x1 y1 x2 y2))))))
4076 (defun artist-key-do-continously-1point (x y)
4077 "Update current 1-point shape at X,Y."
4078 ;; Nothing to do continuously for operations
4079 ;; where we have only one input point
4080 nil)
4082 (defun artist-key-do-continously-2points (x y)
4083 "Update current 2-point shape with 2nd point at X,Y."
4084 (let ((draw-fn (artist-go-get-draw-fn-from-symbol artist-curr-go))
4085 (undraw-fn (artist-go-get-undraw-fn-from-symbol artist-curr-go))
4086 (x1 (artist-endpoint-get-x artist-key-endpoint1))
4087 (y1 (artist-endpoint-get-y artist-key-endpoint1))
4088 (x2 x)
4089 (y2 y))
4090 ;; If not rubber-banding, then move the 2
4091 ;; Otherwise re-draw the shape to the new position
4092 ;;
4093 (if (not artist-rubber-banding)
4094 (progn
4095 (artist-no-rb-unset-point2)
4096 (artist-no-rb-set-point2 x y))
4097 (progn
4098 (artist-funcall undraw-fn artist-key-shape)
4099 (setq artist-key-shape (artist-funcall draw-fn x1 y1 x2 y2))))))
4102 (defun artist-key-do-continously-common ()
4103 "Common routine for updating current shape."
4104 (let ((draw-how (artist-go-get-draw-how-from-symbol artist-curr-go))
4105 (col (artist-current-column))
4106 (row (artist-current-line)))
4108 ;; Depending on what we are currently drawing, call other routines
4109 ;; that knows how to do the job
4110 ;;
4111 (cond ((eq draw-how 'artist-do-continously)
4112 (artist-key-do-continously-continously col row))
4113 ((eq draw-how 'artist-do-poly)
4114 (artist-key-do-continously-poly col row))
4115 ((and (numberp draw-how) (= draw-how 1))
4116 (artist-key-do-continously-1point col row))
4117 ((and (numberp draw-how) (= draw-how 2))
4118 (artist-key-do-continously-2points col row))
4121 ;; Now restore the old position
4122 ;;
4123 (artist-move-to-xy col row)))
4126 (defun artist-key-set-point-continously (x y)
4127 "Set point for current continuous shape at X,Y."
4128 ;; Maybe set arrow-points for continuous shapes
4129 (let ((arrow-pred (artist-go-get-arrow-pred-from-symbol artist-curr-go))
4130 (arrow-set-fn (artist-go-get-arrow-set-fn-from-symbol artist-curr-go))
4131 (init-fn (artist-go-get-init-fn-from-symbol artist-curr-go))
4132 (prep-fill-fn (artist-go-get-prep-fill-fn-from-symbol artist-curr-go))
4133 (exit-fn (artist-go-get-exit-fn-from-symbol artist-curr-go)))
4135 (if (not artist-key-is-drawing)
4136 ;; *** We are about to begin drawing
4137 (progn
4138 (artist-funcall init-fn x y))
4140 ;; *** We are about to stop drawing
4141 (progn
4143 (artist-funcall prep-fill-fn x y)
4144 (if (artist-funcall arrow-pred)
4145 (artist-funcall arrow-set-fn x y)
4146 (artist-clear-arrow-points))
4147 (artist-funcall exit-fn x y))))
4149 ;; Toggle the is-drawing flag
4150 (setq artist-key-is-drawing (not artist-key-is-drawing)))
4154 (defun artist-key-set-point-poly (x y &optional this-is-last-point)
4155 "Set point for current poly-point shape at X,Y.
4156 If optional argument THIS-IS-LAST-POINT is non-nil, this point is the last."
4157 (let ((draw-fn (artist-go-get-draw-fn-from-symbol artist-curr-go))
4158 (init-fn (artist-go-get-init-fn-from-symbol artist-curr-go))
4159 (prep-fill-fn (artist-go-get-prep-fill-fn-from-symbol artist-curr-go))
4160 (exit-fn (artist-go-get-exit-fn-from-symbol artist-curr-go))
4161 (fill-pred (artist-go-get-fill-pred-from-symbol artist-curr-go))
4162 (fill-fn (artist-go-get-fill-fn-from-symbol artist-curr-go))
4163 (arrow-pred (artist-go-get-arrow-pred-from-symbol artist-curr-go))
4164 (arrow-set-fn (artist-go-get-arrow-set-fn-from-symbol artist-curr-go)))
4166 (if (not artist-key-is-drawing)
4168 ;; *** We were not drawing ==> set first point
4169 (progn
4171 (artist-funcall init-fn x y)
4173 ;; If not rubber-banding, set first point.
4174 ;; Otherwise, draw the shape from x,y to x,y
4175 (if (not artist-rubber-banding)
4176 (artist-no-rb-set-point1 x y)
4177 (setq artist-key-shape (artist-funcall draw-fn x y x y)))
4179 ;; Set first endpoint
4180 (setq artist-key-endpoint1 (artist-make-endpoint x y))
4182 ;; Set point-list to contain start point
4183 (setq artist-key-poly-point-list (list (artist-make-endpoint x y)))
4185 ;; Since we are not ready, set the arrow-points to nil
4186 (artist-clear-arrow-points)
4188 ;; Change state to drawing
4189 (setq artist-key-is-drawing t)
4191 ;; Feedback
4192 (message "%s" (substitute-command-keys
4193 (concat "First point set. "
4198 ;; *** We were drawing ==> we are about to set nth point
4199 ;; (last point if the argument this-is-last-point is non-nil)
4200 ;;
4201 (let ((x1 (artist-endpoint-get-x artist-key-endpoint1))
4202 (y1 (artist-endpoint-get-y artist-key-endpoint1))
4203 (x2 x)
4204 (y2 y))
4206 ;; If not rubber-banding, undraw the 1's and 2's, then
4207 ;; draw the shape (if we were rubber-banding, then the
4208 ;; shape is already drawn in artist-key-do-continously-2points.)
4209 ;;
4210 (if (not artist-rubber-banding)
4211 (progn
4212 (artist-no-rb-unset-points)
4213 (setq artist-key-shape (artist-funcall draw-fn x1 y1 x2 y2))))
4215 ;; Set x2 and y2 from shape's second point
4216 ;; (which might be different from the mouse's second point,
4217 ;; if, for example, we are drawing a straight line)
4218 ;;
4219 (if (not (null artist-key-shape))
4220 (let ((endpoint2 (artist-2point-get-endpoint2 artist-key-shape)))
4221 (setq x2 (artist-endpoint-get-x endpoint2))
4222 (setq y2 (artist-endpoint-get-y endpoint2))))
4224 ;; Add the endpoint to the list of poly-points
4225 (setq artist-key-poly-point-list
4226 (append artist-key-poly-point-list
4227 (list (artist-make-endpoint x2 y2))))
4229 ;; Now do handle the case when this is the last point,
4230 ;; and the case when this point isn't the last
4231 ;;
4232 (if (not this-is-last-point)
4233 ;; ** This is not the last point
4234 (progn
4235 ;; Start drawing a new 2-point-shape from last endpoint.
4237 ;; First set the start-point
4238 (setq x1 x2)
4239 (setq y1 y2)
4240 (setq artist-key-endpoint1 (artist-make-endpoint x1 y1))
4242 ;; If we are not rubber-banding, then place the '1
4243 ;; Otherwise, draw the shape from x1,y1 to x1,y1
4244 (if (not artist-rubber-banding)
4245 (artist-no-rb-set-point1 x1 y1)
4246 (setq artist-key-shape (artist-funcall draw-fn x1 y1 x1 y1)))
4248 ;; Feedback
4249 (message "Point set"))
4251 ;; ** This is the last point
4252 (progn
4254 (artist-funcall prep-fill-fn artist-key-poly-point-list)
4256 ;; Maybe fill
4257 (if (artist-funcall fill-pred)
4258 (artist-funcall fill-fn artist-key-shape
4259 artist-key-poly-point-list))
4261 ;; Set the arrow-points
4262 (if (artist-funcall arrow-pred)
4263 (artist-funcall arrow-set-fn artist-key-poly-point-list)
4264 (artist-clear-arrow-points))
4266 (artist-funcall exit-fn artist-key-poly-point-list)
4268 ;; Change state to not drawing
4269 (setq artist-key-shape nil)
4270 (setq artist-key-endpoint1 nil)
4271 (setq artist-key-is-drawing nil)))))))
4274 (defun artist-key-set-point-1point (x y)
4275 "Set point for current 1-point shape at X,Y."
4276 (let ((draw-fn (artist-go-get-draw-fn-from-symbol artist-curr-go))
4277 (init-fn (artist-go-get-init-fn-from-symbol artist-curr-go))
4278 (prep-fill-fn (artist-go-get-prep-fill-fn-from-symbol artist-curr-go))
4279 (exit-fn (artist-go-get-exit-fn-from-symbol artist-curr-go))
4280 (draw-fn (artist-go-get-draw-fn-from-symbol artist-curr-go))
4281 (arrow-pred (artist-go-get-arrow-pred-from-symbol artist-curr-go))
4282 (arrow-set-fn (artist-go-get-arrow-set-fn-from-symbol artist-curr-go)))
4283 (artist-funcall init-fn x y)
4284 (artist-funcall draw-fn x y)
4285 (artist-funcall prep-fill-fn x y)
4286 (if (artist-funcall arrow-pred)
4287 (artist-funcall arrow-set-fn x y)
4288 (artist-clear-arrow-points))
4289 (artist-funcall exit-fn x y))
4290 (setq artist-key-shape nil)
4291 (setq artist-key-is-drawing nil))
4294 (defun artist-key-set-point-2points (x y)
4295 "Set first or second point in current 2-point shape at X,Y."
4296 (let ((draw-fn (artist-go-get-draw-fn-from-symbol artist-curr-go))
4297 (init-fn (artist-go-get-init-fn-from-symbol artist-curr-go))
4298 (prep-fill-fn (artist-go-get-prep-fill-fn-from-symbol artist-curr-go))
4299 (exit-fn (artist-go-get-exit-fn-from-symbol artist-curr-go))
4300 (fill-pred (artist-go-get-fill-pred-from-symbol artist-curr-go))
4301 (fill-fn (artist-go-get-fill-fn-from-symbol artist-curr-go))
4302 (arrow-pred (artist-go-get-arrow-pred-from-symbol artist-curr-go))
4303 (arrow-set-fn (artist-go-get-arrow-set-fn-from-symbol artist-curr-go)))
4304 (if (not artist-key-is-drawing)
4306 ;; *** We were not drawing ==> set first point
4307 (progn
4309 (artist-funcall init-fn x y)
4311 ;; If not rubber-banding, set first point.
4312 ;; Otherwise, draw the shape from x,y to x,y
4313 (if (not artist-rubber-banding)
4314 (artist-no-rb-set-point1 x y)
4315 (setq artist-key-shape (artist-funcall draw-fn x y x y)))
4317 ;; Set first endpoint
4318 (setq artist-key-endpoint1 (artist-make-endpoint x y))
4320 ;; Since we are not ready, clear the arrow-points
4321 (artist-clear-arrow-points)
4323 ;; Change state to drawing
4324 (setq artist-key-is-drawing t))
4326 ;; *** We were drawing ==> we are about to set 2nd point
4327 ;; and end the drawing operation
4329 (let ((x1 (artist-endpoint-get-x artist-key-endpoint1))
4330 (y1 (artist-endpoint-get-y artist-key-endpoint1))
4331 (x2 x)
4332 (y2 y))
4334 ;; If not rubber-banding, undraw the 1's and 2's, then
4335 ;; draw the shape (if we were rubber-banding, then the
4336 ;; shape is already drawn in artist-key-do-continously-2points.)
4337 ;;
4338 (if (not artist-rubber-banding)
4339 (progn
4340 (artist-no-rb-unset-points)
4341 (setq artist-key-shape (artist-funcall draw-fn x1 y1 x2 y2))))
4343 (artist-funcall prep-fill-fn artist-key-shape x1 y1 x2 y2)
4345 ;; Maybe fill
4346 ;;
4347 (if (artist-funcall fill-pred)
4348 (artist-funcall fill-fn artist-key-shape x1 y1 x2 y2))
4350 ;; Maybe set the arrow-points
4351 ;;
4352 (if (artist-funcall arrow-pred)
4353 (artist-funcall arrow-set-fn artist-key-shape x1 y1 x2 y2)
4354 (artist-clear-arrow-points))
4356 (artist-funcall exit-fn artist-key-shape x1 y1 x2 y2)
4358 ;; Change state to not drawing
4359 (setq artist-key-is-drawing nil)))))
4362 (defun artist-key-set-point-common (arg)
4363 "Common routine for setting point in current shape.
4364 With non-nil ARG, set the last point."
4365 (let ((draw-how (artist-go-get-draw-how-from-symbol artist-curr-go))
4366 (col (artist-current-column))
4367 (row (artist-current-line))
4368 (was-drawing artist-key-is-drawing))
4370 ;; First, if we are about to draw, then reset the draw-region
4371 (if (not artist-key-is-drawing)
4372 (artist-draw-region-reset))
4374 ;; Depending on what we are currently drawing, call other routines
4375 ;; that knows how to do the job
4376 ;;
4377 (cond ((eq draw-how 'artist-do-continously)
4378 (artist-key-set-point-continously col row)
4379 ;; Do this now, otherwise nothing will happen until we move.
4380 (artist-key-do-continously-continously col row))
4381 ((eq draw-how 'artist-do-poly)
4382 (artist-key-set-point-poly col row arg))
4383 ((and (numberp draw-how) (= draw-how 1))
4384 (artist-key-set-point-1point col row))
4385 ((and (numberp draw-how) (= draw-how 2))
4386 (artist-key-set-point-2points col row))
4389 ;; Maybe trim line endings
4390 (if (and artist-trim-line-endings
4391 was-drawing
4392 (not artist-key-is-drawing))
4393 (artist-draw-region-trim-line-endings artist-draw-region-min-y
4394 artist-draw-region-max-y))
4396 ;; Now restore the old position
4397 ;;
4398 (artist-move-to-xy col row)
4399 (artist-mode-line-show-curr-operation artist-key-is-drawing)))
4401 ;;
4402 ;; Key navigation
4403 ;;
4405 (defun artist-previous-line (&optional n)
4406 "Move cursor up N lines (default is 1), updating current shape.
4407 If N is negative, move cursor down."
4408 (interactive "p")
4409 (let ((col (artist-current-column)))
4410 (forward-line (- n))
4411 (move-to-column col t))
4412 (when artist-key-is-drawing
4413 (artist-key-do-continously-common)))
4416 (defun artist-next-line (&optional n)
4417 "Move cursor down N lines (default is 1), updating current shape.
4418 If N is negative, move cursor up."
4419 (interactive "p")
4420 (let ((col (artist-current-column)))
4421 (forward-line n)
4422 (move-to-column col t))
4423 (when artist-key-is-drawing
4424 (artist-key-do-continously-common)))
4426 (defun artist-backward-char (&optional n)
4427 "Move cursor backward N chars (default is 1), updating current shape.
4428 If N is negative, move forward."
4429 (interactive "p")
4430 (if (> n 0)
4431 (artist-forward-char (- n))
4432 (artist-forward-char n)))
4434 (defun artist-forward-char (&optional n)
4435 "Move cursor forward N chars (default is 1), updating current shape.
4436 If N is negative, move backward."
4437 (interactive "p")
4438 (let* ((step-x (if (>= n 0) 1 -1))
4439 (distance (abs n))
4440 (curr-col (artist-current-column))
4441 (new-col (max 0 (+ curr-col (* distance step-x)))))
4442 (if (not artist-key-is-drawing)
4443 (move-to-column new-col t)
4444 (move-to-column new-col t)
4445 (artist-key-do-continously-common))))
4448 (defun artist-key-set-point (&optional arg)
4449 "Set a point for the current shape. With optional ARG, set the last point."
4450 (interactive "P")
4451 (artist-key-set-point-common arg))
4454 (defun artist-select-fill-char (c)
4455 "Set current fill character to be C."
4456 (interactive "cType fill char (type RET to turn off): ")
4458 (message "Fill cancelled"))
4459 (t (setq artist-fill-char-set t)
4460 (setq artist-fill-char c)
4464 (defun artist-select-line-char (c)
4465 "Set current line character to be C."
4466 (interactive "cType line char (type RET to turn off): ")
4468 (message "Normal lines"))
4469 (t (setq artist-line-char-set t)
4470 (setq artist-line-char c)
4472 (if artist-key-is-drawing
4473 (artist-key-do-continously-common)))
4476 (defun artist-select-erase-char (c)
4477 "Set current erase character to be C."
4478 (interactive "cType char to use when erasing (type RET for normal): ")
4480 (message "Normal erasing"))
4481 (t (setq artist-erase-char c)
4483 (if artist-key-is-drawing
4484 (artist-key-do-continously-common)))
4486 (defun artist-charlist-to-string (char-list)
4487 "Convert a list of characters, CHAR-LIST, to a string."
4488 (concat char-list))
4490 (defun artist-string-to-charlist (str)
4491 "Convert a string, STR, to list of characters."
4492 (append str nil))
4494 (defun artist-select-spray-chars (chars initial-char)
4495 "Set current spray characters to be CHARS, starting with INITIAL-CHAR."
4496 ;; This huge unreadable `interactive'-clause does the following
4497 ;; 1. Asks for a string of spray-characters
4498 ;; 2. Asks for the initial character (default is the first),
4499 ;; and loops if the answer is not a char within the string in 1.
4500 (interactive
4501 (let* ((str (read-string "Select spray-can characters, lightest first: "
4502 (artist-charlist-to-string artist-spray-chars)))
4503 (char-list (artist-string-to-charlist str))
4504 (initial (let* ((err-msg "")
4505 (ok nil)
4506 (first-char-as-str (char-to-string (car char-list)))
4507 (first-s) (first-c))
4508 (while (not ok)
4509 (setq first-s
4510 (read-string
4511 (format (concat "%sSelect initial-character, "
4513 err-msg str first-char-as-str)))
4514 (if (equal first-s "")
4515 (setq first-s first-char-as-str))
4516 (setq first-c (car (artist-string-to-charlist first-s)))
4517 (setq ok (not (null (member first-c char-list))))
4518 (if (not ok)
4519 (setq err-msg (format
4521 (char-to-string first-c)))))
4522 first-c)))
4523 (list char-list initial)))
4524 (setq artist-spray-chars chars)
4525 (setq artist-spray-new-char initial-char)
4527 (artist-charlist-to-string chars) (char-to-string initial-char)))
4530 (defun artist-select-operation (op-str)
4531 "Select drawing operation OP-STR."
4532 (interactive (list (completing-read "Select operation: "
4533 artist-key-compl-table)))
4534 (let* ((op-symbol (artist-mt-get-symbol-from-keyword op-str))
4535 (draw-how (if op-symbol
4536 (artist-go-get-draw-how-from-symbol op-symbol)
4537 nil)))
4538 ;; First check that the string was valid
4539 (if (null op-symbol)
4540 (error "Unknown drawing method: %s" op-str))
4542 ;; Second, check that we are not about to switch to a different
4543 ;; kind of shape (do that only if we are drawing with keys;
4544 ;; otherwise this function cannot get called).
4545 (if (and artist-key-is-drawing
4546 (not (equal artist-key-draw-how draw-how)))
4547 (error "Cannot switch to a different kind of shape while drawing"))
4549 ;; If we were drawing, undraw the shape
4550 (if (and artist-key-is-drawing
4551 artist-rubber-banding)
4552 (artist-key-undraw-common))
4554 ;; Set the current operation and draw-how
4555 (setq artist-curr-go op-symbol)
4556 (setq artist-key-draw-how draw-how)
4558 ;; If we were drawing, redraw the shape (but don't if shape
4559 ;; is drawn by setting only one point)
4560 (if (and artist-key-is-drawing
4561 artist-rubber-banding
4562 (not (eq artist-key-draw-how 1)))
4563 (artist-key-draw-common)))
4565 ;; Feedback
4566 (artist-mode-line-show-curr-operation artist-key-is-drawing))
4569 (defun artist-toggle-rubber-banding (&optional state)
4570 "Toggle rubber-banding.
4571 If optional argument STATE is positive, turn rubber-banding on."
4572 (interactive)
4573 (if artist-key-is-drawing
4574 (error "Cannot toggle rubber-banding while drawing"))
4575 (if (setq artist-rubber-banding
4576 (if (null state) (not artist-rubber-banding)
4577 (> (prefix-numeric-value state) 0)))
4578 (message "Rubber-banding is now on")
4579 (message "Rubber-banding is now off")))
4582 (defun artist-toggle-trim-line-endings (&optional state)
4583 "Toggle trimming of line-endings.
4584 If optional argument STATE is positive, turn trimming on."
4585 (interactive)
4586 (if (setq artist-trim-line-endings
4587 (if (null state) (not artist-trim-line-endings)
4588 (> (prefix-numeric-value state) 0)))
4589 (message "Trimming is now on")
4590 (message "Trimming is now off")))
4593 (defun artist-toggle-borderless-shapes (&optional state)
4594 "Toggle borders of shapes.
4595 If optional argument STATE is positive, turn borders on."
4596 (interactive)
4597 (if (setq artist-borderless-shapes
4598 (if (null state) (not artist-borderless-shapes)
4599 (> (prefix-numeric-value state) 0)))
4600 (message "Borders are now off")
4601 (message "Borders are now on")))
4604 (defun artist-toggle-first-arrow ()
4605 "Toggle first arrow for shape, if possible."
4606 (interactive)
4607 (save-excursion
4608 (if (not (null artist-arrow-point-1))
4609 (let* ((arrow-point artist-arrow-point-1)
4610 (arrow-state (artist-arrow-point-get-state arrow-point))
4611 (arrow-marker (artist-arrow-point-get-marker arrow-point))
4612 (direction (artist-arrow-point-get-direction arrow-point))
4613 (orig-char (artist-arrow-point-get-orig-char arrow-point))
4614 (arrow-char (aref artist-arrows direction))
4615 (new-state (not arrow-state)))
4617 (goto-char (marker-position arrow-marker))
4619 (if new-state
4620 (if arrow-char
4621 (artist-replace-char arrow-char))
4622 (artist-replace-char orig-char))
4624 (artist-arrow-point-set-state artist-arrow-point-1 new-state)))))
4626 (defun artist-toggle-second-arrow ()
4627 "Toggle second arrow for shape, if possible."
4628 (interactive)
4629 (save-excursion
4630 (if (not (null artist-arrow-point-2))
4631 (let* ((arrow-point artist-arrow-point-2)
4632 (arrow-state (artist-arrow-point-get-state arrow-point))
4633 (arrow-marker (artist-arrow-point-get-marker arrow-point))
4634 (direction (artist-arrow-point-get-direction arrow-point))
4635 (orig-char (artist-arrow-point-get-orig-char arrow-point))
4636 (arrow-char (aref artist-arrows direction))
4637 (new-state (not arrow-state)))
4639 (goto-char (marker-position arrow-marker))
4641 (if new-state
4642 (if arrow-char
4643 (artist-replace-char arrow-char))
4644 (artist-replace-char orig-char))
4646 (artist-arrow-point-set-state artist-arrow-point-2 new-state)))))
4648 (defun artist-select-op-pen-line ()
4649 "Select drawing pen lines."
4650 (interactive)
4651 (artist-select-operation "Pen Line"))
4653 (defun artist-select-op-line ()
4654 "Select drawing lines."
4655 (interactive)
4656 (artist-select-operation "line"))
4658 (defun artist-select-op-straight-line ()
4659 "Select drawing straight lines."
4660 (interactive)
4661 (artist-select-operation "straight line"))
4663 (defun artist-select-op-rectangle ()
4664 "Select drawing rectangles."
4665 (interactive)
4666 (artist-select-operation "rectangle"))
4668 (defun artist-select-op-square ()
4669 "Select drawing squares."
4670 (interactive)
4671 (artist-select-operation "square"))
4673 (defun artist-select-op-poly-line ()
4674 "Select drawing poly-lines."
4675 (interactive)
4676 (artist-select-operation "poly-line"))
4678 (defun artist-select-op-straight-poly-line ()
4679 "Select drawing straight poly-lines."
4680 (interactive)
4681 (artist-select-operation "straight poly-line"))
4683 (defun artist-select-op-ellipse ()
4684 "Select drawing ellipses."
4685 (interactive)
4686 (artist-select-operation "ellipse"))
4688 (defun artist-select-op-circle ()
4689 "Select drawing circles."
4690 (interactive)
4691 (artist-select-operation "circle"))
4693 (defun artist-select-op-text-see-thru ()
4694 "Select rendering text (see thru)."
4695 (interactive)
4696 (artist-select-operation "text see-thru"))
4698 (defun artist-select-op-text-overwrite ()
4699 "Select rendering text (overwrite)."
4700 (interactive)
4701 (artist-select-operation "text overwrite"))
4703 (defun artist-select-op-spray-can ()
4704 "Select spraying."
4705 (interactive)
4706 (artist-select-operation "spray-can"))
4708 (defun artist-select-op-spray-set-size ()
4709 "Select setting size for spraying."
4710 (interactive)
4711 (artist-select-operation "spray set size"))
4713 (defun artist-select-op-erase-char ()
4714 "Select erasing characters."
4715 (interactive)
4716 (artist-select-operation "erase char"))
4718 (defun artist-select-op-erase-rectangle ()
4719 "Select erasing rectangles."
4720 (interactive)
4721 (artist-select-operation "erase rectangle"))
4723 (defun artist-select-op-vaporize-line ()
4724 "Select vaporizing single lines."
4725 (interactive)
4726 (artist-select-operation "vaporize line"))
4728 (defun artist-select-op-vaporize-lines ()
4729 "Select vaporizing connected lines."
4730 (interactive)
4731 (artist-select-operation "vaporize lines"))
4733 (defun artist-select-op-cut-rectangle ()
4734 "Select cutting rectangles."
4735 (interactive)
4736 (artist-select-operation "cut rectangle"))
4738 (defun artist-select-op-cut-square ()
4739 "Select cutting squares."
4740 (interactive)
4741 (artist-select-operation "cut square"))
4743 (defun artist-select-op-copy-rectangle ()
4744 "Select copying rectangles."
4745 (interactive)
4746 (artist-select-operation "copy rectangle"))
4748 (defun artist-select-op-copy-square ()
4749 "Select copying squares."
4750 (interactive)
4751 (artist-select-operation "cut square"))
4753 (defun artist-select-op-paste ()
4754 "Select pasting."
4755 (interactive)
4756 (artist-select-operation "paste"))
4758 (defun artist-select-op-flood-fill ()
4759 "Select flood-filling."
4760 (interactive)
4761 (artist-select-operation "flood-fill"))
4764 ;; Drawing lines by using mouse
4765 ;; Mouse button actions
4766 ;;
4768 (defun artist-update-pointer-shape ()
4769 "Perform the update of the X Windows pointer shape."
4770 (set-mouse-color nil))
4772 (defvar x-pointer-shape)
4774 (defun artist-set-pointer-shape (new-pointer-shape)
4775 "Set the shape of the X Windows pointer to NEW-POINTER-SHAPE."
4776 (setq x-pointer-shape new-pointer-shape)
4777 (artist-update-pointer-shape))
4779 (defsubst artist-event-is-shifted (ev)
4780 "Check whether the shift-key is pressed in event EV."
4781 (memq 'shift (event-modifiers ev)))
4783 (defun artist-do-nothing ()
4784 "Function that does nothing."
4785 (interactive))
4787 (defun artist-compute-up-event-key (ev)
4788 "Compute the corresponding up key sequence for event EV."
4789 (let* ((basic (event-basic-type ev))
4790 (unshifted basic)
4791 (shifted (make-symbol (concat "S-" (symbol-name basic)))))
4792 (if (artist-event-is-shifted ev)
4793 (make-vector 1 shifted)
4794 (make-vector 1 unshifted))))
4796 (defun artist-down-mouse-1 (ev)
4797 "Perform drawing action for event EV."
4798 (interactive "@e")
4799 (let* ((real (artist-go-get-symbol-shift
4800 artist-curr-go (artist-event-is-shifted ev)))
4801 (draw-how (artist-go-get-draw-how-from-symbol real))
4802 ;; Remember original values for draw-region-min-y and max-y
4803 ;; in case we are interrupting a key-draw operation.
4804 (orig-draw-region-min-y artist-draw-region-min-y)
4805 (orig-draw-region-max-y artist-draw-region-max-y)
4806 (orig-pointer-shape (if (eq window-system 'x) x-pointer-shape nil))
4807 (echoq-keystrokes 10000) ; a lot of seconds
4808 ;; Remember original binding for the button-up event to this
4809 ;; button-down event.
4810 (key (artist-compute-up-event-key ev))
4811 (orig-button-up-binding (lookup-key (current-global-map) key)))
4813 (unwind-protect
4814 (progn
4815 (if (eq window-system 'x)
4816 (artist-set-pointer-shape artist-pointer-shape))
4818 ;; Redefine the button-up binding temporarily (the original
4819 ;; binding is restored in the unwind-forms below). This is to
4820 ;; avoid the phenomenon outlined in this scenario:
4821 ;;
4822 ;; 1. A routine which reads something from the mini-buffer (such
4823 ;; as the text renderer) is called from below.
4824 ;; 2. Meanwhile, the users releases the mouse button.
4825 ;; 3. As a (funny :-) coincidence, the binding for the
4826 ;; button-up event is often mouse-set-point, so Emacs
4827 ;; sets the point to where the button was released, which is
4828 ;; in the buffer where the user wants to place the text.
4829 ;; 4. The user types C-x o (or uses the mouse once again)
4830 ;; until he reaches the mini-buffer which is still prompting
4831 ;; for some text to render.
4832 ;;
4833 ;; To do this foolproof, all local and minor-mode maps should
4834 ;; be searched and temporarily changed as well, since they
4835 ;; too might have some binding for the button-up event,
4836 ;; but I hope dealing with the global map will suffice.
4837 (define-key (current-global-map) key 'artist-do-nothing)
4839 (artist-draw-region-reset)
4841 (artist-mode-line-show-curr-operation t)
4843 (cond ((eq draw-how 'artist-do-continously)
4844 (artist-mouse-draw-continously ev))
4845 ((eq draw-how 'artist-do-poly)
4846 (artist-mouse-draw-poly ev))
4847 ((and (numberp draw-how) (= draw-how 1))
4848 (artist-mouse-draw-1point ev))
4849 ((and (numberp draw-how) (= draw-how 2))
4850 (artist-mouse-draw-2points ev))
4852 draw-how)))
4854 (if artist-trim-line-endings
4855 (artist-draw-region-trim-line-endings artist-draw-region-min-y
4856 artist-draw-region-max-y))
4857 (setq artist-draw-region-min-y orig-draw-region-min-y)
4858 (setq artist-draw-region-max-y orig-draw-region-max-y))
4860 ; This is protected
4861 (if (eq window-system 'x)
4862 (artist-set-pointer-shape orig-pointer-shape))
4864 (if orig-button-up-binding
4865 (define-key (current-global-map) key orig-button-up-binding))
4867 (artist-mode-line-show-curr-operation artist-key-is-drawing))))
4870 (defun artist-mouse-choose-operation (ev op)
4871 "Choose operation for event EV and operation OP."
4872 (interactive
4873 (progn
4874 (select-window (posn-window (event-start last-input-event)))
4875 (list last-input-event
4876 (if (display-popup-menus-p)
4877 (x-popup-menu last-nonmenu-event artist-popup-menu-table)
4878 'no-popup-menus))))
4880 (if (eq op 'no-popup-menus)
4881 ;; No popup menus. Call `tmm-prompt' instead, but with the
4882 ;; up-mouse-button, if any, temporarily disabled, otherwise
4883 ;; it'll interfere.
4884 (let* ((key (artist-compute-up-event-key ev))
4885 (orig-button-up-binding (lookup-key (current-global-map) key)))
4886 (unwind-protect
4887 (define-key (current-global-map) key 'artist-do-nothing)
4888 (setq op (tmm-prompt artist-popup-menu-table))
4889 (if orig-button-up-binding
4890 (define-key (current-global-map) key orig-button-up-binding)))))
4892 (let ((draw-fn (artist-go-get-draw-fn-from-symbol (car op)))
4893 (set-fn (artist-fc-get-fn-from-symbol (car op))))
4894 (cond
4896 ;; *** It was a draw-function
4897 ((not (listp draw-fn))
4898 (let* ((unshifted (artist-go-get-symbol-shift (car op) nil))
4899 (shifted (artist-go-get-symbol-shift (car op) t))
4900 (shift-state (artist-event-is-shifted ev))
4901 (selected-op (if shift-state shifted unshifted))
4902 (keyword (artist-go-get-keyword-from-symbol selected-op)))
4903 (artist-select-operation keyword)))
4905 ;; *** It was a set/unset function
4906 ((not (listp set-fn))
4907 (call-interactively set-fn)))))
4910 (defun artist-down-mouse-3 (ev)
4911 "Erase character or rectangle, depending on event EV."
4912 (interactive "@e")
4913 (let ((artist-curr-go 'erase-char))
4914 (artist-down-mouse-1 ev))
4915 ;; Restore mode-line
4916 (artist-mode-line-show-curr-operation artist-key-is-drawing))
4919 ;;
4920 ;; Mouse routines
4921 ;;
4923 (defsubst artist-shift-has-changed (shift-state ev)
4924 "From the last SHIFT-STATE and EV, determine if the shift-state has changed."
4925 ;; This one simply doesn't work.
4926 ;;
4927 ;; There seems to be no way to tell whether the user has pressed shift
4928 ;; while dragging the cursor around when we are in a track-mouse
4929 ;; form. Calling (event-modifiers ev) yields nil :-( Neither is the
4930 ;; (event-basic-type ev) of any help (it is simply `mouse-movement').
4931 ;;
4932 ;; So this doesn't work:
4933 ;; (cond ((and shift-state (not (artist-event-is-shifted ev))) t)
4934 ;; ((and (not shift-state) (artist-event-is-shifted ev)) t)
4935 ;; (t nil))
4936 nil)
4938 (defun artist-coord-win-to-buf (coord)
4939 "Convert a window-relative coordinate COORD to a buffer-relative coordinate."
4940 (let ((window-x (car coord))
4941 (window-y (cdr coord))
4942 (window-start-x (window-hscroll))
4943 (window-start-y (save-excursion (goto-char (window-start))
4944 (artist-current-line))))
4945 (cons (+ window-x window-start-x)
4946 (+ window-y window-start-y))))
4949 (defun artist-mouse-draw-continously (ev)
4950 "Generic function for shapes that require 1 point as input.
4951 Operation is done continuously while the mouse button is hold down.
4952 The event, EV, is the mouse event."
4953 (let* ((unshifted (artist-go-get-symbol-shift artist-curr-go nil))
4954 (shifted (artist-go-get-symbol-shift artist-curr-go t))
4955 (shift-state (artist-event-is-shifted ev))
4956 (op (if shift-state shifted unshifted))
4957 (draw-how (artist-go-get-draw-how-from-symbol op))
4958 (init-fn (artist-go-get-init-fn-from-symbol op))
4959 (prep-fill-fn (artist-go-get-prep-fill-fn-from-symbol op))
4960 (exit-fn (artist-go-get-exit-fn-from-symbol op))
4961 (draw-fn (artist-go-get-draw-fn-from-symbol op))
4962 (interval-fn (artist-go-get-interval-fn-from-symbol op))
4963 (interval (artist-funcall interval-fn))
4964 (arrow-pred (artist-go-get-arrow-pred-from-symbol op))
4965 (arrow-set-fn (artist-go-get-arrow-set-fn-from-symbol op))
4966 (ev-start (event-start ev))
4967 (initial-win (posn-window ev-start))
4968 (ev-start-pos (artist-coord-win-to-buf (posn-col-row ev-start)))
4969 (x1 (car ev-start-pos))
4970 (y1 (cdr ev-start-pos))
4971 (shape)
4972 (timer))
4973 (select-window (posn-window ev-start))
4974 (artist-funcall init-fn x1 y1)
4975 (if (not artist-rubber-banding)
4976 (artist-no-rb-set-point1 x1 y1))
4977 (track-mouse
4978 (while (or (mouse-movement-p ev)
4979 (member 'down (event-modifiers ev)))
4980 (setq ev-start-pos (artist-coord-win-to-buf
4981 (posn-col-row (event-start ev))))
4982 (setq x1 (car ev-start-pos))
4983 (setq y1 (cdr ev-start-pos))
4985 ;; Cancel previous timer
4986 (if timer
4987 (cancel-timer timer))
4989 (if (not (eq initial-win (posn-window (event-start ev))))
4990 ;; If we moved outside the window, do nothing
4991 nil
4993 ;; Still in same window:
4994 ;;
4995 ;; Check if user presses or releases shift key
4996 (if (artist-shift-has-changed shift-state ev)
4998 ;; First check that the draw-how is the same as we
4999 ;; already have. Otherwise, ignore the changed shift-state.
5000 (if (not (eq draw-how
5001 (artist-go-get-draw-how-from-symbol
5002 (if (not shift-state) shifted unshifted))))
5003 (message "Cannot switch to shifted operation")
5005 ;; progn is "implicit" since this is the else-part
5006 (setq shift-state (not shift-state))
5007 (setq op (if shift-state shifted unshifted))
5008 (setq draw-how (artist-go-get-draw-how-from-symbol op))
5009 (setq draw-fn (artist-go-get-draw-fn-from-symbol op))))
5011 ;; Draw the new shape
5012 (setq shape (artist-funcall draw-fn x1 y1))
5013 (artist-move-to-xy x1 y1)
5015 ;; Start the timer to call `draw-fn' repeatedly every
5016 ;; `interval' second
5017 (if (and interval draw-fn)
5018 (setq timer (run-at-time interval interval draw-fn x1 y1))))
5020 ;; Read next event
5021 (setq ev (read-event))))
5023 ;; Cancel any timers
5024 (if timer
5025 (cancel-timer timer))
5027 (artist-funcall prep-fill-fn x1 y1)
5029 (if (artist-funcall arrow-pred)
5030 (artist-funcall arrow-set-fn x1 y1)
5031 (artist-clear-arrow-points))
5033 (artist-funcall exit-fn x1 y1)
5034 (artist-move-to-xy x1 y1)))
5038 (defun artist-mouse-draw-poly (ev)
5039 "Generic function for shapes requiring several points as input.
5040 The event, EV, is the mouse event."
5041 (interactive "@e")
5042 (message "Mouse-1: set new point, mouse-2: set last point")
5043 (let* ((unshifted (artist-go-get-symbol-shift artist-curr-go nil))
5044 (shifted (artist-go-get-symbol-shift artist-curr-go t))
5045 (shift-state (artist-event-is-shifted ev))
5046 (op (if shift-state shifted unshifted))
5047 (draw-how (artist-go-get-draw-how-from-symbol op))
5048 (init-fn (artist-go-get-init-fn-from-symbol op))
5049 (prep-fill-fn (artist-go-get-prep-fill-fn-from-symbol op))
5050 (exit-fn (artist-go-get-exit-fn-from-symbol op))
5051 (draw-fn (artist-go-get-draw-fn-from-symbol op))
5052 (undraw-fn (artist-go-get-undraw-fn-from-symbol op))
5053 (fill-pred (artist-go-get-fill-pred-from-symbol op))
5054 (fill-fn (artist-go-get-fill-fn-from-symbol op))
5055 (arrow-pred (artist-go-get-arrow-pred-from-symbol op))
5056 (arrow-set-fn (artist-go-get-arrow-set-fn-from-symbol op))
5057 (ev-start (event-start ev))
5058 (initial-win (posn-window ev-start))
5059 (ev-start-pos (artist-coord-win-to-buf (posn-col-row ev-start)))
5060 (x1-last (car ev-start-pos))
5061 (y1-last (cdr ev-start-pos))
5062 (x2 x1-last)
5063 (y2 y1-last)
5064 (is-down t)
5065 (shape nil)
5066 (point-list nil)
5067 (done nil))
5068 (select-window (posn-window ev-start))
5069 (artist-funcall init-fn x1-last y1-last)
5070 (if (not artist-rubber-banding)
5071 (artist-no-rb-set-point1 x1-last y1-last))
5072 (track-mouse
5073 (while (not done)
5074 ;; decide what to do
5075 (cond
5077 ;; *** Mouse button is released.
5078 ((and is-down
5079 (or (member 'click (event-modifiers ev))
5080 (member 'drag (event-modifiers ev))))
5081 ;; First, if not rubber-banding, draw the line.
5082 ;;
5083 (if (not artist-rubber-banding)
5084 (progn
5085 (artist-no-rb-unset-points)
5086 (setq shape (artist-funcall draw-fn x1-last y1-last x2 y2))))
5088 ;; Set the second point to the shape's second point
5089 ;; (which might be different from the mouse's second point,
5090 ;; if, for example, we are drawing a straight line)
5091 ;;
5092 (if (not (null shape))
5093 (let ((endpoint2 (artist-2point-get-endpoint2 shape)))
5094 (setq x1-last (artist-endpoint-get-x endpoint2))
5095 (setq y1-last (artist-endpoint-get-y endpoint2))))
5096 (setq point-list (cons (artist-make-endpoint x1-last y1-last)
5097 point-list))
5098 (setq shape nil)
5099 (setq is-down nil))
5101 ;; *** Mouse button 2 or 3 down
5102 ((and (member 'down (event-modifiers ev))
5103 (or (equal (event-basic-type ev) 'mouse-2)
5104 (equal (event-basic-type ev) 'mouse-3)))
5105 ;; Ignore
5106 nil)
5108 ;; *** Mouse button 2 or 3 released
5109 ((and (or (member 'click (event-modifiers ev))
5110 (member 'drag (event-modifiers ev)))
5111 (or (equal (event-basic-type ev) 'mouse-2)
5112 (equal (event-basic-type ev) 'mouse-3)))
5114 ;; This means the end of our poly-line drawing-session.
5115 ;;
5116 (setq done t))
5118 ;; *** Mouse button 1 went down
5119 ((and (not is-down)
5120 (member 'down (event-modifiers ev))
5121 (equal (event-basic-type ev) 'mouse-1))
5122 ;; Check whether the (possibly new, that depends on if shift
5123 ;; has been pressed or released) symbol has the same draw-how
5124 ;; information as the previous had. If it hasn't, we can't
5125 ;; proceed.
5126 ;;
5127 (if (not (eq draw-how
5128 (artist-go-get-draw-how-from-symbol
5129 (if (not shift-state) shifted unshifted))))
5130 (message "Cannot switch operation")
5131 (progn
5132 ;; Decide operation
5133 ;;
5134 (setq unshifted
5135 (artist-go-get-symbol-shift artist-curr-go nil)
5136 shifted
5137 (artist-go-get-symbol-shift artist-curr-go t)
5138 shift-state (artist-event-is-shifted ev)
5139 op (if shift-state shifted unshifted)
5140 draw-how (artist-go-get-draw-how-from-symbol op)
5141 draw-fn (artist-go-get-draw-fn-from-symbol op)
5142 undraw-fn (artist-go-get-undraw-fn-from-symbol op)
5143 fill-pred (artist-go-get-fill-pred-from-symbol op)
5144 fill-fn (artist-go-get-fill-fn-from-symbol op))
5146 ;; Draw shape from last place to this place
5148 ;; set x2 and y2
5149 ;;
5150 (setq ev-start-pos (artist-coord-win-to-buf
5151 (posn-col-row (event-start ev))))
5152 (setq x2 (car ev-start-pos))
5153 (setq y2 (cdr ev-start-pos))
5155 ;; Draw the new shape (if not rubber-banding, place both marks)
5156 ;;
5157 (if artist-rubber-banding
5158 (setq shape (artist-funcall draw-fn x1-last y1-last x2 y2))
5159 (progn
5160 (artist-no-rb-set-point1 x1-last y1-last)
5161 (artist-no-rb-set-point2 x2 y2)))
5163 ;; Show new operation in mode-line
5164 (let ((artist-curr-go op))
5165 (artist-mode-line-show-curr-operation t))))
5167 (setq is-down t))
5170 ;; *** Mouse moved, button is down and we are still in orig window
5171 ((and (mouse-movement-p ev)
5172 is-down
5173 (eq initial-win (posn-window (event-start ev))))
5174 ;; Draw shape from last place to this place
5175 ;;
5176 ;; set x2 and y2
5177 (setq ev-start-pos (artist-coord-win-to-buf
5178 (posn-col-row (event-start ev))))
5179 (setq x2 (car ev-start-pos))
5180 (setq y2 (cdr ev-start-pos))
5182 ;; First undraw last shape
5183 ;; (unset last point if not rubberbanding)
5184 ;;
5185 (artist-funcall undraw-fn shape)
5187 ;; Draw the new shape (if not rubberbanding, set 2nd mark)
5188 ;;
5189 (if artist-rubber-banding
5190 (setq shape (artist-funcall draw-fn x1-last y1-last x2 y2))
5191 (progn
5192 (artist-no-rb-unset-point2)
5193 (artist-no-rb-set-point2 x2 y2)))
5194 ;; Move cursor
5195 (artist-move-to-xy x2 y2))
5197 ;; *** Mouse moved, button is down but we are NOT in orig window
5198 ((and (mouse-movement-p ev)
5199 is-down
5200 (not (eq initial-win (posn-window (event-start ev)))))
5201 ;; Ignore
5202 nil)
5205 ;; *** Moving mouse while mouse button is not down
5206 ((and (mouse-movement-p ev) (not is-down))
5207 ;; don't do anything.
5208 nil)
5211 ;; *** Mouse button 1 went down, first time
5212 ((and is-down
5213 (member 'down (event-modifiers ev))
5214 (equal (event-basic-type ev) 'mouse-1))
5215 ;; don't do anything
5216 nil)
5219 ;; *** Another event
5220 (t
5221 ;; End drawing
5222 ;;
5223 (setq done t)))
5225 ;; Read next event (only if we should not stop)
5226 (if (not done)
5227 (setq ev (read-event)))))
5229 ;; Reverse point-list (last points are cond'ed first)
5230 (setq point-list (reverse point-list))
5232 (artist-funcall prep-fill-fn point-list)
5234 ;; Maybe fill
5235 (if (artist-funcall fill-pred)
5236 (artist-funcall fill-fn point-list))
5238 ;; Maybe set arrow points
5239 (if (and point-list (artist-funcall arrow-pred))
5240 (artist-funcall arrow-set-fn point-list)
5241 (artist-clear-arrow-points))
5243 (artist-funcall exit-fn point-list)
5244 (artist-move-to-xy x2 y2)))
5247 (defun artist-mouse-draw-1point (ev)
5248 "Generic function for shapes requiring only 1 point as input.
5249 Operation is done once. The event, EV, is the mouse event."
5250 (interactive "@e")
5251 (let* ((unshifted (artist-go-get-symbol-shift artist-curr-go nil))
5252 (shifted (artist-go-get-symbol-shift artist-curr-go t))
5253 (shift-state (artist-event-is-shifted ev))
5254 (op (if shift-state shifted unshifted))
5255 (draw-how (artist-go-get-draw-how-from-symbol op))
5256 (init-fn (artist-go-get-init-fn-from-symbol op))
5257 (prep-fill-fn (artist-go-get-prep-fill-fn-from-symbol op))
5258 (exit-fn (artist-go-get-exit-fn-from-symbol op))
5259 (draw-fn (artist-go-get-draw-fn-from-symbol op))
5260 (arrow-pred (artist-go-get-arrow-pred-from-symbol op))
5261 (arrow-set-fn (artist-go-get-arrow-set-fn-from-symbol op))
5262 (ev-start (event-start ev))
5263 (ev-start-pos (artist-coord-win-to-buf (posn-col-row ev-start)))
5264 (x1 (car ev-start-pos))
5265 (y1 (cdr ev-start-pos)))
5266 (select-window (posn-window ev-start))
5267 (artist-funcall init-fn x1 y1)
5268 (artist-funcall draw-fn x1 y1)
5269 (artist-funcall prep-fill-fn x1 y1)
5270 (if (artist-funcall arrow-pred)
5271 (artist-funcall arrow-set-fn x1 y1)
5272 (artist-clear-arrow-points))
5273 (artist-funcall exit-fn x1 y1)
5274 (artist-move-to-xy x1 y1)))
5277 (defun artist-mouse-draw-2points (ev)
5278 "Generic function for shapes requiring 2 points as input.
5279 The event, EV, is the mouse event."
5280 (interactive "@e")
5281 (let* ((unshifted (artist-go-get-symbol-shift artist-curr-go nil))
5282 (shifted (artist-go-get-symbol-shift artist-curr-go t))
5283 (shift-state (artist-event-is-shifted ev))
5284 (op (if shift-state shifted unshifted))
5285 (draw-how (artist-go-get-draw-how-from-symbol op))
5286 (init-fn (artist-go-get-init-fn-from-symbol op))
5287 (prep-fill-fn (artist-go-get-prep-fill-fn-from-symbol op))
5288 (exit-fn (artist-go-get-exit-fn-from-symbol op))
5289 (draw-fn (artist-go-get-draw-fn-from-symbol op))
5290 (undraw-fn (artist-go-get-undraw-fn-from-symbol op))
5291 (fill-pred (artist-go-get-fill-pred-from-symbol op))
5292 (fill-fn (artist-go-get-fill-fn-from-symbol op))
5293 (arrow-pred (artist-go-get-arrow-pred-from-symbol op))
5294 (arrow-set-fn (artist-go-get-arrow-set-fn-from-symbol op))
5295 (ev-start (event-start ev))
5296 (initial-win (posn-window ev-start))
5297 (ev-start-pos (artist-coord-win-to-buf (posn-col-row ev-start)))
5298 (x1 (car ev-start-pos))
5299 (y1 (cdr ev-start-pos))
5300 (x2)
5301 (y2)
5302 (shape))
5303 (select-window (posn-window ev-start))
5304 (artist-funcall init-fn x1 y1)
5305 (if (not artist-rubber-banding)
5306 (artist-no-rb-set-point1 x1 y1))
5307 (track-mouse
5308 (while (or (mouse-movement-p ev)
5309 (member 'down (event-modifiers ev)))
5310 (setq ev-start-pos (artist-coord-win-to-buf
5311 (posn-col-row (event-start ev))))
5312 (setq x2 (car ev-start-pos))
5313 (setq y2 (cdr ev-start-pos))
5315 (if (not (eq initial-win (posn-window (event-start ev))))
5316 ;; If we moved outside the window, do nothing
5317 nil
5319 ;; Still in same window:
5320 ;;
5321 ;; First undraw last shape (unset last point if not rubberbanding)
5322 (if artist-rubber-banding
5323 (artist-funcall undraw-fn shape)
5324 (artist-no-rb-unset-point2))
5326 ;; Check if user presses or releases shift key
5327 (if (artist-shift-has-changed shift-state ev)
5329 ;; First check that the draw-how is the same as we
5330 ;; already have. Otherwise, ignore the changed shift-state.
5331 (if (not (eq draw-how
5332 (artist-go-get-draw-how-from-symbol
5333 (if (not shift-state) shifted unshifted))))
5334 (message "Cannot switch to shifted operation")
5336 (message "Switching")
5337 ;; progn is "implicit" since this is the else-part
5338 (setq shift-state (not shift-state))
5339 (setq op (if shift-state shifted unshifted))
5340 (setq draw-how (artist-go-get-draw-how-from-symbol op))
5341 (setq draw-fn (artist-go-get-draw-fn-from-symbol op))
5342 (setq undraw-fn (artist-go-get-undraw-fn-from-symbol op))
5343 (setq fill-pred (artist-go-get-fill-pred-from-symbol op))
5344 (setq fill-fn (artist-go-get-fill-fn-from-symbol op))))
5346 ;; Draw the new shape
5347 (if artist-rubber-banding
5348 (setq shape (artist-funcall draw-fn x1 y1 x2 y2))
5349 (artist-no-rb-set-point2 x2 y2))
5350 ;; Move cursor
5351 (artist-move-to-xy x2 y2))
5354 ;; Read next event
5355 (setq ev (read-event))))
5357 ;; If we are not rubber-banding (that is, we were moving around the `2')
5358 ;; draw the shape
5359 (if (not artist-rubber-banding)
5360 (progn
5361 (artist-no-rb-unset-points)
5362 (setq shape (artist-funcall draw-fn x1 y1 x2 y2))))
5364 (artist-funcall prep-fill-fn shape x1 y1 x2 y2)
5366 ;; Maybe fill
5367 (if (artist-funcall fill-pred)
5368 (artist-funcall fill-fn shape x1 y1 x2 y2))
5370 ;; Maybe set arrow-points
5371 (if (artist-funcall arrow-pred)
5372 (artist-funcall arrow-set-fn shape x1 y1 x2 y2)
5373 (artist-clear-arrow-points))
5375 (artist-funcall exit-fn shape x1 y1 x2 y2)
5376 (artist-move-to-xy x2 y2)))
5379 ;;
5380 ;; Bug-report-submitting
5381 ;;
5382 (defun artist-submit-bug-report ()
5383 "Submit via mail a bug report on Artist."
5384 (interactive)
5385 (require 'reporter)
5386 (if (y-or-n-p "Do you want to submit a bug report on Artist? ")
5387 (let ((to artist-maintainer-address)
5388 (vars '(window-system
5389 window-system-version
5390 ;;
5391 artist-rubber-banding
5392 artist-interface-with-rect
5393 artist-aspect-ratio
5394 ;; Now the internal ones
5395 artist-curr-go
5396 artist-key-poly-point-list
5397 artist-key-shape
5398 artist-key-draw-how
5399 artist-arrow-point-1
5400 artist-arrow-point-2)))
5401 ;; Remove those variables from vars that are not bound
5402 (mapc
5403 (function
5404 (lambda (x)
5405 (if (not (and (boundp x) (symbol-value x)))
5406 (setq vars (delq x vars))))) vars)
5407 (reporter-submit-bug-report
5408 artist-maintainer-address
5409 (concat "artist.el " artist-version)
5410 vars
5411 nil nil
5413 "I have a nice bug report on Artist for you! Here it is:")))))
5416 ;;
5417 ;; Now provide this minor mode
5418 ;;
5420 (provide 'artist)
5423 ;;; About adding drawing modes
5424 ;;; --------------------------
5426 ;; If you are going to add a new drawing mode, read the following
5427 ;; sketchy outlines to get started a bit easier.
5428 ;;
5429 ;; 1. If your new drawing mode falls into one of the following
5430 ;; categories, goto point 2, otherwise goto point 3.
5431 ;;
5432 ;; - Modes where the shapes are drawn continuously, as long as
5433 ;; the mouse button is held down (continuous modes).
5434 ;; Example: the erase-char mode, the pen and pen-line modes.
5435 ;;
5436 ;; - Modes where the shape is made up of from 2 points to an
5437 ;; arbitrary number of points (poly-point modes).
5438 ;; Example: the poly-line mode
5439 ;;
5440 ;; - Modes where the shape is made up of 2 points (2-point
5441 ;; modes).
5442 ;; Example: lines, rectangles
5443 ;;
5444 ;; - Modes where the shape is made up of 1 point (1-point
5445 ;; modes). This mode differs from the continuous modes in
5446 ;; that the shape is drawn only once when the mouse button
5447 ;; is pressed.
5448 ;; Examples: paste, a flood-fill, vaporize modes
5449 ;;
5450 ;;
5451 ;; 2. To make it easier and more flexible to program new drawing
5452 ;; modes, you might choose to specify
5453 ;; init-fn: a function to be called at the very beginning
5454 ;; of the drawing phase,
5455 ;; prep-fill-fn: a function to be called before filling,
5456 ;; arrow-set-fn: a function for setting arrows, to be called
5457 ;; after filling, and
5458 ;; exit-fn: a function to be called at the very end of
5459 ;; the drawing phase.
5460 ;; For each of the cases below, the arguments given to the init-fn,
5461 ;; prep-fill-fn, arrow-set-fn and exit-fn are stated.
5462 ;;
5463 ;; If your mode matches the continuous mode or the 1-point mode:
5464 ;;
5465 ;; a. Create a draw-function that draws your shape. Your function
5466 ;; must take x and y as arguments. The return value is not
5467 ;; used.
5468 ;;
5469 ;; b. Add your mode to the master table, `artist-mt'.
5470 ;;
5471 ;; init-fn: x y
5472 ;; prep-fill-fn: x y
5473 ;; arrow-set-fn: x y
5474 ;; exit-fn: x y
5475 ;;
5476 ;; If your mode matches the 2-point mode:
5477 ;;
5478 ;; a. Create one draw-function that draws your shape and one
5479 ;; undraw-function that undraws it.
5480 ;;
5481 ;; The draw-function must take x1, y1, x2 and y2 as
5482 ;; arguments. It must return a list with three elements:
5483 ;; Endpoint1: a vector [x1 y1]
5484 ;; Endpoint2: a vector [x2 y2]
5485 ;; Shapeinfo: all info necessary for your undraw-function to
5486 ;; be able to undraw the shape
5487 ;; Use the artist-endpoint-* accessors to create and inspect
5488 ;; the endpoints.
5489 ;;
5490 ;; If applicable, you must be able to draw your shape without
5491 ;; borders if the `artist-borderless-shapes' is non-nil.
5492 ;; See `artist-draw-rect' for an example.
5493 ;;
5494 ;; The undraw-function must take one argument: the list created
5495 ;; by your draw-function. The return value is not used.
5496 ;;
5497 ;; b. If you want to provide a fill-function, then create a
5498 ;; function that takes 5 arguments: the list created by your
5499 ;; draw-function, x1, y1, x2 and y2. The return value is not
5500 ;; used.
5501 ;;
5502 ;; c. Add your mode to the master table, `artist-mt'.
5503 ;;
5504 ;; init-fn: x1 y1
5505 ;; prep-fill-fn: shape x1 y1 x2 y2
5506 ;; arrow-set-fn: shape x1 y1 x2 y2
5507 ;; exit-fn: shape x1 y1 x2 y2
5508 ;;
5509 ;; If your mode matches the poly-point mode:
5510 ;;
5511 ;; a. Create one draw-function that draws your shape and one
5512 ;; undraw-function that undraws it. The draw- and
5513 ;; undraw-functions are used to draw/undraw a segment of
5514 ;; your poly-point mode between 2 points. The draw- and
5515 ;; undraw-functions are then really 2-point mode functions.
5516 ;; They must take the same arguments and return the same
5517 ;; values as those of the 2-point mode.
5518 ;;
5519 ;; If applicable, you must be able to draw your shape without
5520 ;; borders if the `artist-borderless-shapes' is non-nil.
5521 ;; See `artist-draw-rect' for an example.
5522 ;;
5523 ;; b. If you want to provide a fill-function, then create a
5524 ;; function that takes 1 argument: a list of points where each
5525 ;; point is a vector, [x, y].
5526 ;;
5527 ;; c. Add your mode to the master table, `artist-mt'.
5528 ;;
5529 ;; init-fn: x1 y1
5530 ;; prep-fill-fn: point-list
5531 ;; arrow-set-fn: point-list
5532 ;; exit-fn: point-list
5533 ;;
5534 ;; The arrow-set-fn must set the variables `artist-arrow-point-1'
5535 ;; and `artist-arrow-point-2'. If your mode does not take arrows,
5536 ;; you must set the variables to nil. Use the accessors
5537 ;; artist-arrow-point-* to create and inspect arrow-points.
5538 ;;
5539 ;;
5540 ;; 3. If your mode doesn't match any of the categories, you are facing
5541 ;; a bit more work, and I cannot be as detailed as above. Here is a
5542 ;; brief outline of what you have to do:
5543 ;;
5544 ;; a. Decide on a name for your type of mode. Let's assume that
5545 ;; you decided on `xxx'. Then you should use the draw-how
5546 ;; symbol artist-do-xxx.
5547 ;;
5548 ;; b. Create a function artist-mouse-draw-xxx for drawing with
5549 ;; mouse. It should be called from `artist-down-mouse-1'.
5550 ;;
5551 ;; The all coordinates must be converted from window-relative
5552 ;; to buffer relative before saved or handed over to
5553 ;; any other function. Converting is done with
5554 ;; the function `artist-coord-win-to-buf'.
5555 ;;
5556 ;; It must take care to the `artist-rubber-banding' variable
5557 ;; and perform rubber-banding accordingly. Use the
5558 ;; artist-no-rb-* functions if not rubber-banding.
5559 ;;
5560 ;; If applicable, you must be able to draw your shape without
5561 ;; borders if the `artist-borderless-shapes' is non-nil.
5562 ;; See `artist-draw-rect' for an example.
5563 ;;
5564 ;; You must call the init-fn, the prep-fill-fn, arrow-set-fn
5565 ;; and the exit-fn at the appropriate points.
5566 ;;
5567 ;; When artist-mouse-draw-xxx ends, the shape for your mode
5568 ;; must be completely drawn.
5569 ;;
5570 ;; c. Create functions for drawing with keys:
5571 ;;
5572 ;; - artist-key-set-point-xxx for setting a point in the
5573 ;; mode, to be called from `artist-key-set-point-common'.
5574 ;;
5575 ;; - artist-key-do-continuously-xxx to be called from
5576 ;; `artist-key-do-continuously-common' whenever the user
5577 ;; moves around.
5578 ;;
5579 ;; As for the artist-mouse-draw-xxx, these two functions must
5580 ;; take care to do rubber-banding, borderless shapes and to
5581 ;; set arrows.
5582 ;;
5583 ;; These functions should set the variable `artist-key-shape'
5584 ;; to the shape drawn.
5585 ;;
5586 ;; d. Create artist-key-draw-xxx and artist-key-undraw-xxx for
5587 ;; drawing and undrawing. These are needed when the user
5588 ;; switches operation to draw another shape of the same type
5589 ;; of drawing mode.
5590 ;;
5591 ;; You should provide these functions. You might think that
5592 ;; only you is using your type of mode, so no one will be able
5593 ;; to switch to another operation of the same type of mode,
5594 ;; but someone else might base a new drawing mode upon your
5595 ;; work.
5596 ;;
5597 ;; You must call the init-fn, the prep-fill-fn, arrow-set-fn
5598 ;; and the exit-fn at the appropriate points.
5599 ;;
5600 ;; e. Add your new mode to the master table, `artist-mt'.
5601 ;;
5602 ;;
5603 ;; Happy hacking! Please let me hear if you add any drawing modes!
5604 ;; Don't hesitate to ask me any questions.
5607 ;;; artist.el ends here