Re: Elisp and overlay, how to show an image

[Michael Heerdegen via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>]

Sébastien Gendre <seb@k-7.ch> writes:

> 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. 

Have a look at (info "(elisp) Image Descriptors") - in particular,
:scale, :ascent, :margin.  AFAIU you are allowed to manipulate the data
structure of an already created image "object".  But note that not every
image type supports or implements all descriptors.


Michael.