How to keep the size aspect ratio of GUI form fixed?

Hi all. I am trying to make my GUI figure to be resizable but I need the aspect ratio to be fixed. Is this possible to achieve?

Answer 1

[Walter Roberson]

You can put in a resize callback on the figure that changes the size to match the aspect ratio you want.

[Naz]

My GUI figure is called 'Vessel' and here is a code I provide for it:

function Vessel_Callback(hObject, eventdata, handles)

[x y w h]=get(hObject,'Position')

w=(4*h)/3;

set(hObject,'Position',[x y w h])

So far, it does not seem to work

[Naz]

Walter, can you give me a more explicit suggestion?