Re:

From: Fons Rademakers (Fons.Rademakers@cern.ch)
Date: Wed Mar 19 1997 - 12:34:51 MET


Hi Maarten,

 in your case just use:
     TApplication theApp("Toep", 0, 0);

However, better do this once and for all in the main() program. Also
never call
delete on an object (delete &theApp). The object will be destructed
automatically
when leaving the routine.

Cheers, Fons.


Maarten Bruinsma wrote:
> 
> Thanks (dank je wel) for your very quick reply. What you mentioned could
> very well be the problem. I have created dummies for the command line
> argument, as I haven't got a clue what to put ther below you will
> find the routine in which I invoke the ROOT stuff
> 
> void Track::Plot_On_Screen(CellInfo
> this_cel[NUMBER_OF_PLANES][NUMBER_OF_WIRES]) /* plot circles and line */
> {
>   int a=0;
>   char** p;
>   TLine *this_line;
>   TApplication theApp("Toep", &a, p);
>   TCanvas *c = new TCanvas("Picture", "The Alignment Geometry", 400, 400);
>   c->Show();
>   TEllipse* these_ellipses = new TEllipse[nr_of_hits];
>   for(a=0;a<nr_of_hits;a++)
>     {
>       these_ellipses[a]= TEllipse(hit[a].Z(), hit[a].Y(), hit[a].R(),
> hit[a].Error_R());
>       these_ellipses[a].Draw();
>     }
>   this_line = new
> TLine(Z_0,0,this_cel[8][7].Z(),(this_cel[8][7].Z()-Z_0)*tan(1.570796-phi));
> /* max z zit bovenste mod. */
>   this_line->Draw(); /* nog herschalen */
>   c->Update();
>   getchar();
>   theApp.SetReturnFromRun();
>   theApp.Run();
>   delete &theApp;
> }
> 
> the purpose is to plot a track on screen and apart from mentioned error
> will still need debugging probably.
> 
> Thanks again and in advance.
> 
> *************************************************************************
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-- 
Org:    CERN, European Laboratory for Particle Physics.
Mail:   1211 Geneve 23, Switzerland          Phone: +41 22 7679248
E-Mail: Fons.Rademakers@cern.ch              Fax:   +41 22 7822601



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