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. > > ************************************************************************* > * Maarten Bruinsma * > * ----------------------- * > * Werk: Prive: * > * NIKHEF/ HERA B Ruysdaelkade 189 HS * > * Kruislaan 409 1072 AV AMSTERDAM * > * Postbus 41882 tel. (020) 6758856 * > * 1009 DB AMSTERDAM * > * tel. (020) 5922116 email: t26@nikhef.nl * > * fax. (020) 5995155 http://www.nikhef.nl/user/t26/ * > ************************************************************************* -- 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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