Re: Elisp and overlay, how to show an image

["Sébastien Gendre" <seb@k-7.ch>]

Stefan Monnier via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org> writes:
> As Tomas points out, the `display` property is obeyed only if it covers
> characters.  The usual way to "insert" an image without disrupting the
> content of the buffer (e.g. in `put-image`) is to put the image (with
> `display` property) on a *string* and then put that string in the
> `before-string` (or `after-string`) property of an overlay.
>
>     (let ((ol (put-image (create-image "~/Path/to/my/image.jpg")
>                          (point-min))))
>       (overlay-put ol 'after-string "\n"))
>
>
> - Stefan
<#secure method=pgpmime mode=sign>

Thank you, to Tomas and you, for your replies. It help me a lot.

I didn't know that (put-image) will return the overlay it created.

Is there a way to set a bottom margin to the added overlay, or to the
image, like with CSS on a web page ? Or do I need to add more "\n" with
(overlay-put) ?


I need to found a way to modify the way the image is shown. Controlling
the zoom, on which part it's centered and how the image is cut. I will
read more carefully the section "41.17 Images" of the elisp manual.
Until now, I was started by the overlays section of the manual.