Re: Elisp and overlay, how to show an image

[<tomas@tuxteam.de>]

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On Sat, Jul 06, 2024 at 11:12:23PM +0200, Sébastien Gendre wrote:
> Hello,
> 
> I am trying to show an image on the top of a buffer, before the first
> line of text, and put a small margin at the bottom of the image.
> 
> 
> I have read the Overlay manual [1] and the source code of the function
> `org-display-inline-images`, but I have difficulties to understand how
> to use overlay beginning and end parameters.
> 
> 
> Here is the source code my first try:
> 
> 
>     ;; Create an overlay at the first char of the buffer
>     (setq ov1 (make-overlay 1 1))

I think you have to give the overlay some width. Possibly you'll
have to insert some text (one char will be enough) to slap the
overlay on.

>     
>     ;; Create the image from a file
>     (setq my_image (create-image "~/Path/to/my/image.jpg"))
>     
>     ;; Put a new line, to avoid aving the image replacing the first char
>     (overlay-put ov1 'before-string "\n")

I'm not quite sure the before-string is displayed when the overlay has
a 'display property.

Cheers
-- 
t

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