* Displaying an overlay image across the margins and body
@ 2021-07-06 7:36 Thomas F. K. Jorna
2021-07-06 9:23 ` Emanuel Berg via Users list for the GNU Emacs text editor
0 siblings, 1 reply; 2+ messages in thread
From: Thomas F. K. Jorna @ 2021-07-06 7:36 UTC (permalink / raw)
To: help-gnu-emacs
Hi!
I want to create an overlay (or, to avoid X-Y problems, a multicolored,
multilayered, visually distinct line at an arbitrary position that
cannot be removed, like a page-break) that spans the entire "page", by
which I mean the margins and buffer width, of zero width, and insertable
anywhere.
I've created a sample function which does that (be sure to |(require
'svg)| if you want to test it)
|(defun insert-svg-overlay () (interactive) (let* ((margin-pixel-width
(* (frame-char-width) (car (window-margins)))) (svg (svg-create
margin-pixel-width 50)) (svg2 (svg-create (window-body-width nil t) 50))
(ov (make-overlay (point) (point)))) (svg-rectangle svg 0 0
margin-pixel-width 50 :fill-color "red") (svg-rectangle svg2 0 0
(window-body-width nil t) 50 :fill-color "yellow") (overlay-put ov
'before-string (concat (propertize "x" 'display (svg-image svg2))
(propertize "x" 'display (list (list 'margin 'right-margin) (svg-image
svg))) (propertize "x" 'display (list (list 'margin 'left-margin)
(svg-image svg))))))) |
which, if you have margins set, will insert an (ugly-looking) overlay
like so red-yellow line inserted in the middle of some code
<https://i.stack.imgur.com/vKBSg.png>.
This does exactly what I want at the start of an "actual" line. However,
I would like it to do the same thing at the start of a /visual / line.
However, doing so yields (inserting before |(svg-image svg)|) same line,
now with the yellow line offset from the rest
<https://i.stack.imgur.com/azk6U.png>
How do I "prevent" some of the overlay from going places it shouldn't? I
have tried so many different combinations of |before-string|,
|after-string| and plain inserting images, to no avail. There are two
things that do work, but are undesirable in their own right.
1. Make the middle rectangle 1 pixel shorter, by changing |svg2| to
|(svg2 (svg-create (1- (window-body-width nil t) 50))| same line,
now correct but with a 1 pixel gap between the middle yellow chunk
and the right red chunk <https://i.stack.imgur.com/VYuRn.png>
Undesirable for obvious reasons.
2. Make the overlay occupy non-zero space. This allows you to change
the region occupied by the overlay to the image/whatever, which
somehow /does/ work. Undesirable because this would remove the
character(s) we want to have.
I feel like there is some combination of |before-string|s and
|after-string|s and svg-order that will accomplish what I want, but I
have had very little luck so far.
Somehow parts of the overlay get pushed to the next line, but why? I'm
relatively sure it has something to do with visual-line-mode, is there
some way to "prevent" it from word-wrapping specific strings?
I am using svg's/overlays because I want to be able to draw in
them/display multiple lines.
This way of displaying in the margins comes from |put-image|.
Thank you very much for your help!
Thomas F. K. Jorna
PS. This is a copy of
https://emacs.stackexchange.com/questions/66457/why-cant-i-create-a-full-width-overlay-and-display-in-the-margins-at-the-same-t
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Displaying an overlay image across the margins and body
2021-07-06 7:36 Displaying an overlay image across the margins and body Thomas F. K. Jorna
@ 2021-07-06 9:23 ` Emanuel Berg via Users list for the GNU Emacs text editor
0 siblings, 0 replies; 2+ messages in thread
From: Emanuel Berg via Users list for the GNU Emacs text editor @ 2021-07-06 9:23 UTC (permalink / raw)
To: help-gnu-emacs
Thomas F. K. Jorna wrote:
> svg
Oh, good that you got it to work!
I tried several years ago to make a drawing of an outdoor
project I did. IIRC I didn't get it to work, not even
indoors...
The only thing I can say is your lines are so wide they
overflow the sacred 80 sometimes, perhaps. This
> (list (list 'margin 'left-margin))
perhaps can be put as
'((margin left-margin))
?
--
underground experts united
https://dataswamp.org/~incal
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