I have a gui that loads an image into some axes located into the gui.
The image loaded can be of different size. I would like that the gui
resizes and repositions all buttons around the axis appropriately when
a larger or smaller image is loaded. Could you point out any resources
for this?

Alternatively, how to convert pixel sizes to characters in Matlab? I
could programatically position the elements of the gui depending on
pixel size of the image loaded, but it seems this is not too friendly
across platforms.

Any help would be greatly appreciated.

Thanks.