sure you know that the way to a GUI window is much longer
as with processing
but that is the interesting thing,
if you want to fly over my first steps about this
you might see some ideas how to begin:
beginner C++ to GUI (on RPI )
that is not a tutorial, because i not know any of that languages,
it is a LOG what i try,
the whole idea was that i needed to get a overview what is possible
for entry level linux / languages-compiler but with the interest to learn GUI
the specialists at the RPI forum are hardcore terminal users
and the internet is full of terminal hello world examples…
but getting / making a operable window seems to be same unsupported
like with windows.