[racket] Very simple animation in #racket/gui

Hello dear community members,

I am trying to build a GUI with a very simple animation - just a moving dot
(or vertical line) from the left side of the canvas object to it's right
side.

There is a section called "1.7 Animation in Canvases" in the racket
documentation:

http://docs.racket-lang.org/gui/windowing-overview.html#%28part._animation%29

But it's very short and without examples.

Could you please point me out where to search or maybe give me actual
example how to implement this using racket/gui ? I know there are
matlab-like plotting libs but I am going to build GUI with a lot of buttons
and parameters, I don't need just a plot, that's why I am asking about
implementation in #racket/gui environment.

Thank you in advance.

-- 
Best regards,
Alex
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