(lemacs.info)Rectangles in Picture
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Picture Mode Rectangle Commands
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.).
Clear out the region-rectangle (`picture-clear-rectangle'). With
argument, kill it.
`C-c C-w R'
Similar but save rectangle contents in register R first
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
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.
The Picture mode commands for yanking rectangles differ from the
standard ones in overwriting instead of inserting. This is the same
way that Picture mode insertion of other text is different 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 for the rectangle found
in a specified register.
Since most region commands in Picture mode operate on rectangles,
when you select a region of text with the mouse in Picture mode, it is
highlighted as a rectangle.
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