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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* Maarten Bruinsma *
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