Insert in Picture Picture Rectangles in Picture
Two kinds of tab-like action are provided in Picture mode. Use
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
TAB, this command moves to the next such interesting
character in the current line. M-
TAB does not change the
text; it only moves point. ``Interesting'' characters are defined by
picture-tab-chars, which should define a set of
characters. The syntax for this variable is like the syntax used inside
[...]' in a regular expression---but without the `
and the `
]'. Its default value is
TAB itself runs
picture-tab, which operates based on the
current tab stop settings; it is the Picture mode equivalent of
tab-to-tab-stop. Normally it just moves point, but with a numeric
argument it clears the text that it moves over.
The context-based and tab-stop-based forms of tabbing are brought
together by the command C-c
This command sets the tab stops to the positions which M-
would consider significant in the current line. The use of this command,
TAB, can get the effect of context-based tabbing. But
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 C-x
TAB from messing
up the picture. You can do this by setting the variable
nil. See Just Spaces.