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(emacs)Rectangles in Picture

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Picture Mode Rectangle Commands
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   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 (Note: Rectangles).

`C-c C-k'
     Clear out the region-rectangle with spaces
     (`picture-clear-rectangle').  With argument, delete the text.

`C-c C-w R'
     Similar, but save rectangle contents in register R first
     (`picture-clear-rectangle-to-register').

`C-c C-y'
     Copy last killed rectangle into the buffer by overwriting, with
     upper left corner at point (`picture-yank-rectangle').  With
     argument, insert instead.

`C-c C-x R'
     Similar, but use the rectangle in register R
     (`picture-yank-rectangle-from-register').

   The picture rectangle commands `C-c C-k' (`picture-clear-rectangle')
and `C-c C-w' (`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 `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.  `C-c
C-k' either with or without a numeric argument saves the rectangle for
`C-c C-y'.

   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.  `C-c C-y' (`picture-yank-rectangle') inserts (by overwriting)
the rectangle that was most recently killed, while `C-c C-x'
(`picture-yank-rectangle-from-register') does likewise for the
rectangle found in a specified register.