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Most keys do the same thing in Picture mode that they usually do, but
do it in a quarter-plane style. For example, C-f is rebound to
run 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. C-b is rebound to run
picture-backward-column, which always moves point left one
column, converting a tab to multiple spaces if necessary. C-n and
C-p are rebound to run picture-move-down and
picture-move-up, which can either insert spaces or convert tabs
as necessary to make sure that point stays in exactly the same column.
C-e runs picture-end-of-line, which moves to after the last
nonblank character on the line. There is no need to change C-a,
as the choice of screen model does not affect beginnings of
lines.
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. RET runs picture-newline, which just moves to
the beginning of the following line so that new text will replace that
line.
Picture mode provides erasure instead of deletion and killing of
text. DEL (picture-backward-clear-column) replaces the
preceding character with a space rather than removing it; this moves
point backwards. C-d (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
SPC.) C-k (picture-clear-line) really kills the
contents of lines, but does not delete the newlines from the
buffer.
To do actual insertion, you must use special commands. C-o
(picture-open-line) creates a blank line after the current line;
it never splits a line. C-M-o (split-line) makes sense in
Picture mode, so it is not changed. C-j
(picture-duplicate-line) inserts below the current line another
line with the same contents.
To do actual deletion in Picture mode, use C-w, C-c C-d
(which is defined as delete-char, as C-d is in other
modes), or one of the picture rectangle commands (@pxref{Rectangles in
Picture}).
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This document was generated by Roberto on abril, 2 2007 using texi2html 1.76.