+++ /dev/null
-@c This is part of the Emacs manual.
-@c Copyright (C) 1985, 1986, 1987, 1993, 1994, 1995, 1997, 2002, 2003,
-@c 2004, 2005, 2006 Free Software Foundation, Inc.
-@c See file emacs.texi for copying conditions.
-@node Picture, Sending Mail, Abbrevs, Top
-@chapter Editing Pictures
-@cindex pictures
-@cindex making pictures out of text characters
-@findex edit-picture
-
- To edit a picture made out of text characters (for example, a picture
-of the division of a register into fields, as a comment in a program),
-use the command @kbd{M-x edit-picture} to enter Picture mode.
-
- In Picture mode, editing is based on the @dfn{quarter-plane} model of
-text, according to which the text characters lie studded on an area that
-stretches infinitely far to the right and downward. The concept of the end
-of a line does not exist in this model; the most you can say is where the
-last nonblank character on the line is found.
-
- Of course, Emacs really always considers text as a sequence of
-characters, and lines really do have ends. But Picture mode replaces
-the most frequently-used commands with variants that simulate the
-quarter-plane model of text. They do this by inserting spaces or by
-converting tabs to spaces.
-
- Most of the basic editing commands of Emacs are redefined by Picture mode
-to do essentially the same thing but in a quarter-plane way. In addition,
-Picture mode defines various keys starting with the @kbd{C-c} prefix to
-run special picture editing commands.
-
- One of these keys, @kbd{C-c C-c}, is particularly important. Often a
-picture is part of a larger file that is usually edited in some other
-major mode. @kbd{M-x edit-picture} records the name of the previous
-major mode so you can use the @kbd{C-c C-c} command
-(@code{picture-mode-exit}) later to go back to that mode. @kbd{C-c C-c}
-also deletes spaces from the ends of lines, unless given a numeric
-argument.
-
- The special commands of Picture mode all work in other modes (provided
-the @file{picture} library is loaded), but are not bound to keys except
-in Picture mode. The descriptions below talk of moving ``one column''
-and so on, but all the picture mode commands handle numeric arguments as
-their normal equivalents do.
-
-@vindex picture-mode-hook
- Turning on Picture mode runs the hook @code{picture-mode-hook}
-(@pxref{Hooks}). Additional extensions to Picture mode can be found
-in @file{artist.el}.
-
-@menu
-* Basic Picture:: Basic concepts and simple commands of Picture Mode.
-* Insert in Picture:: Controlling direction of cursor motion
- after "self-inserting" characters.
-* Tabs in Picture:: Various features for tab stops and indentation.
-* Rectangles in Picture:: Clearing and superimposing rectangles.
-@end menu
-
-@node Basic Picture, Insert in Picture, Picture, Picture
-@section Basic Editing in Picture Mode
-
-@findex picture-forward-column
-@findex picture-backward-column
-@findex picture-move-down
-@findex picture-move-up
-@cindex editing in Picture mode
-
- Most keys do the same thing in Picture mode that they usually do, but
-do it in a quarter-plane style. For example, @kbd{C-f} is rebound to
-run @code{picture-forward-column}, a command which moves point one
-column to the right, inserting a space if necessary so that the actual
-end of the line makes no difference. @kbd{C-b} is rebound to run
-@code{picture-backward-column}, which always moves point left one
-column, converting a tab to multiple spaces if necessary. @kbd{C-n} and
-@kbd{C-p} are rebound to run @code{picture-move-down} and
-@code{picture-move-up}, which can either insert spaces or convert tabs
-as necessary to make sure that point stays in exactly the same column.
-@kbd{C-e} runs @code{picture-end-of-line}, which moves to after the last
-nonblank character on the line. There is no need to change @kbd{C-a},
-as the choice of screen model does not affect beginnings of
-lines.
-
-@findex picture-newline
- Insertion of text is adapted to the quarter-plane screen model through
-the use of Overwrite mode (@pxref{Minor Modes}). Self-inserting characters
-replace existing text, column by column, rather than pushing existing text
-to the right. @key{RET} runs @code{picture-newline}, which just moves to
-the beginning of the following line so that new text will replace that
-line.
-
-@findex picture-backward-clear-column
-@findex picture-clear-column
-@findex picture-clear-line
- In Picture mode, the commands that normally delete or kill text,
-instead erase text (replacing it with spaces). @key{DEL}
-(@code{picture-backward-clear-column}) replaces the preceding
-character with a space rather than removing it; this moves point
-backwards. @kbd{C-d} (@code{picture-clear-column}) replaces the next
-character or characters with spaces, but does not move point. (If you
-want to clear characters to spaces and move forward over them, use
-@key{SPC}.) @kbd{C-k} (@code{picture-clear-line}) really kills the
-contents of lines, but does not delete the newlines from the buffer.
-
-@findex picture-open-line
- To do actual insertion, you must use special commands. @kbd{C-o}
-(@code{picture-open-line}) creates a blank line after the current
-line; it never splits a line. @kbd{C-M-o} (@code{split-line}) makes
-sense in Picture mode, so it is not changed. @kbd{C-j}
-(@code{picture-duplicate-line}) inserts another line with the same
-contents below the current line.
-
-@kindex C-c C-d @r{(Picture mode)}
- To do actual deletion in Picture mode, use @kbd{C-w}, @kbd{C-c C-d}
-(which is defined as @code{delete-char}, as @kbd{C-d} is in other
-modes), or one of the picture rectangle commands (@pxref{Rectangles in
-Picture}).
-
-@node Insert in Picture, Tabs in Picture, Basic Picture, Picture
-@section Controlling Motion after Insert
-
-@findex picture-movement-up
-@findex picture-movement-down
-@findex picture-movement-left
-@findex picture-movement-right
-@findex picture-movement-nw
-@findex picture-movement-ne
-@findex picture-movement-sw
-@findex picture-movement-se
-@kindex C-c < @r{(Picture mode)}
-@kindex C-c > @r{(Picture mode)}
-@kindex C-c ^ @r{(Picture mode)}
-@kindex C-c . @r{(Picture mode)}
-@kindex C-c ` @r{(Picture mode)}
-@kindex C-c ' @r{(Picture mode)}
-@kindex C-c / @r{(Picture mode)}
-@kindex C-c \ @r{(Picture mode)}
- Since ``self-inserting'' characters in Picture mode overwrite and move
-point, there is no essential restriction on how point should be moved.
-Normally point moves right, but you can specify any of the eight
-orthogonal or diagonal directions for motion after a ``self-inserting''
-character. This is useful for drawing lines in the buffer.
-
-@table @kbd
-@item C-c <
-@itemx C-c @key{LEFT}
-Move left after insertion (@code{picture-movement-left}).
-@item C-c >
-@itemx C-c @key{RIGHT}
-Move right after insertion (@code{picture-movement-right}).
-@item C-c ^
-@itemx C-c @key{UP}
-Move up after insertion (@code{picture-movement-up}).
-@item C-c .
-@itemx C-c @key{DOWN}
-Move down after insertion (@code{picture-movement-down}).
-@item C-c `
-@itemx C-c @key{HOME}
-Move up and left (``northwest'') after insertion (@code{picture-movement-nw}).
-@item C-c '
-@itemx C-c @key{PAGEUP}
-Move up and right (``northeast'') after insertion
-(@code{picture-movement-ne}).
-@item C-c /
-@itemx C-c @key{END}
-Move down and left (``southwest'') after insertion
-@*(@code{picture-movement-sw}).
-@item C-c \
-@itemx C-c @key{PAGEDOWN}
-Move down and right (``southeast'') after insertion
-@*(@code{picture-movement-se}).
-@end table
-
-@kindex C-c C-f @r{(Picture mode)}
-@kindex C-c C-b @r{(Picture mode)}
-@findex picture-motion
-@findex picture-motion-reverse
- Two motion commands move based on the current Picture insertion
-direction. The command @kbd{C-c C-f} (@code{picture-motion}) moves in the
-same direction as motion after ``insertion'' currently does, while @kbd{C-c
-C-b} (@code{picture-motion-reverse}) moves in the opposite direction.
-
-@node Tabs in Picture, Rectangles in Picture, Insert in Picture, Picture
-@section Picture Mode Tabs
-
-@kindex M-TAB @r{(Picture mode)}
-@findex picture-tab-search
-@vindex picture-tab-chars
- Two kinds of tab-like action are provided in Picture mode. Use
-@kbd{M-@key{TAB}} (@code{picture-tab-search}) for context-based tabbing.
-With no argument, it moves to a point underneath the next
-``interesting'' character that follows whitespace in the previous
-nonblank line. ``Next'' here means ``appearing at a horizontal position
-greater than the one point starts out at.'' With an argument, as in
-@kbd{C-u M-@key{TAB}}, this command moves to the next such interesting
-character in the current line. @kbd{M-@key{TAB}} does not change the
-text; it only moves point. ``Interesting'' characters are defined by
-the variable @code{picture-tab-chars}, which should define a set of
-characters. The syntax for this variable is like the syntax used inside
-of @samp{[@dots{}]} in a regular expression---but without the @samp{[}
-and the @samp{]}. Its default value is @code{"!-~"}.
-
-@findex picture-tab
- @key{TAB} itself runs @code{picture-tab}, which operates based on the
-current tab stop settings; it is the Picture mode equivalent of
-@code{tab-to-tab-stop}. Normally it just moves point, but with a numeric
-argument it clears the text that it moves over.
-
-@kindex C-c TAB @r{(Picture mode)}
-@findex picture-set-tab-stops
- The context-based and tab-stop-based forms of tabbing are brought
-together by the command @kbd{C-c @key{TAB}} (@code{picture-set-tab-stops}).
-This command sets the tab stops to the positions which @kbd{M-@key{TAB}}
-would consider significant in the current line. The use of this command,
-together with @key{TAB}, can get the effect of context-based tabbing. But
-@kbd{M-@key{TAB}} is more convenient in the cases where it is sufficient.
-
- It may be convenient to prevent use of actual tab characters in
-pictures. For example, this prevents @kbd{C-x @key{TAB}} from messing
-up the picture. You can do this by setting the variable
-@code{indent-tabs-mode} to @code{nil}. @xref{Just Spaces}.
-
-@node Rectangles in Picture,, Tabs in Picture, Picture
-@section Picture Mode Rectangle Commands
-@cindex rectangles and Picture mode
-@cindex Picture mode and rectangles
-
- Picture mode defines commands for working on rectangular pieces of the
-text in ways that fit with the quarter-plane model. The standard rectangle
-commands may also be useful (@pxref{Rectangles}).
-
-@table @kbd
-@item C-c C-k
-Clear out the region-rectangle with spaces
-(@code{picture-clear-rectangle}). With argument, delete the text.
-@item C-c C-w @var{r}
-Similar, but save rectangle contents in register @var{r} first
-(@code{picture-clear-rectangle-to-register}).
-@item C-c C-y
-Copy last killed rectangle into the buffer by overwriting, with upper
-left corner at point (@code{picture-yank-rectangle}). With argument,
-insert instead.
-@item C-c C-x @var{r}
-Similar, but use the rectangle in register @var{r}
-(@code{picture-yank-rectangle-from-register}).
-@end table
-
-@kindex C-c C-k @r{(Picture mode)}
-@kindex C-c C-w @r{(Picture mode)}
-@findex picture-clear-rectangle
-@findex picture-clear-rectangle-to-register
- The picture rectangle commands @kbd{C-c C-k}
-(@code{picture-clear-rectangle}) and @kbd{C-c C-w}
-(@code{picture-clear-rectangle-to-register}) differ from the standard
-rectangle commands in that they normally clear the rectangle instead of
-deleting it; this is analogous with the way @kbd{C-d} is changed in Picture
-mode.
-
- However, deletion of rectangles can be useful in Picture mode, so
-these commands delete the rectangle if given a numeric argument.
-@kbd{C-c C-k} either with or without a numeric argument saves the
-rectangle for @kbd{C-c C-y}.
-
-@kindex C-c C-y @r{(Picture mode)}
-@kindex C-c C-x @r{(Picture mode)}
-@findex picture-yank-rectangle
-@findex picture-yank-rectangle-from-register
- The Picture mode commands for yanking rectangles differ from the
-standard ones in that they overwrite instead of inserting. This is
-the same way that Picture mode insertion of other text differs from
-other modes. @kbd{C-c C-y} (@code{picture-yank-rectangle}) inserts
-(by overwriting) the rectangle that was most recently killed, while
-@kbd{C-c C-x} (@code{picture-yank-rectangle-from-register}) does
-likewise for the rectangle found in a specified register.
-
-@ignore
- arch-tag: b7589747-683c-4f40-aed8-1b10403cb666
-@end ignore
HCoop / bpt / emacs.git / commitdiff