Jacek,
I have the impression that you are running in batch mode. This is the
case when you do not define a TApplication object or if explictly
you call gROOT->SetBatch(kTRUE); Please check.
About your point with c->Draw, you should not do:
c->Draw(); c->Update();
but
c->Modified(); c->Update();
Rene Brun
"Jacek M. Holeczek" wrote:
>
> > Did you draw something in the canvas?
>
> The point is - there is NOTHING drawn, even the canvas itself.
> I mean, the "new TCanvas(...)" doesn't draw anything.
> And later the "c->Draw()" doesn't draw anything.
>
> > Could you add the statement
> > c->Saveas("mycancas.root");
>
> Well, the "mycancas.root" looks perfectly fine.
> Is it possible that because I link my Geant4 application with root
> libraries (and not opposite) something important doesn't get initialized ?
>
> > Note that the statement c->Draw() is redundant when called in the session
> > where the canvas has been created.
>
> I need (from time to time) to "c->Draw(); c->Update();" in order to
> "refresh" the canvas.
>
> Thanks in advance,
> Jacek.
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