On Sat, Sep 09, 2017 at 03:02:25PM -0300, Luis López wrote:
> Hi!

Hi!

> I'm trying to simulate a diffraction grating for my pupils. I have two
> scrolled-canvas: one for displaying the spectrum as colors, and one for
> showing its intensity profile.
>
> The problem is that I want to make the first one to have a specific height

have you tried:

(ltk:configure (canvas scrolled-canvas-instance) :height size)

Bye!
C.