Hi Christian,
When you create a TPaveText, you can choose in which coordinate system
you draw (current pad coordinates or NDC).
In your case, you want to give NDC coordinates. This should be specified
in the optional argument.
Replace the statement:
TPaveText pt1(0.7,0.8,0.9,0.9);
by
TPaveText pt1(0.7,0.8,0.9,0.9,"brNDC");
TPaveText derives from TPave. The options are explained TPave:
option = "T" Top frame
option = "B" Bottom frame
option = "R" Right frame
option = "L" Left frame
option = "NDC" x1,y1,x2,y2 are given in NDC
option = "ARC" corners are rounded
Rene Brun
Christian Haeberli wrote:
>
> Dear ROOTers
>
> I put four TGraphs in a TH2 and fitted them. Now I'd like to label the
> four curves. I tried it with TPaveText, but the problem is, that in my
> case TPavetext.Draw() works in an empty canvas only. Where is the
> mistake? You can see my code below.
>
> Thank you
>
> Christian
>
> --
>
> c1 = new TCanvas("c1","Resolution",200,10,700,500);
>
> c1->SetFillColor(42);
> c1->SetGrid();
> c1->GetFrame()->SetFillColor(21);
> c1->GetFrame()->SetBorderSize(12);
>
> TH2F *hr = new TH2F("hr","Resolution of the Strip Modules for
> electrons",40,5,60,40,4,13);
> hr->SetXTitle("Lead Thickness [mm]");
> hr->SetYTitle("Resolution (RMS) [mm]");
> hr->Draw();
>
> TGraph *gr[4];
>
> for (i=0;i<4;i++) {
> gr[i] = new TGraph(n,lead,resol[i]);
> gr[i]->SetTitle("Resolution");
> gr[i]->SetMarkerColor(i+1);
> gr[i]->SetMarkerStyle(21+i);
> gr[i]->Draw("P");
> gr[i]->Fit("pol3");
> }
>
> TPaveText pt1(0.7,0.8,0.9,0.9);
> pt1.AddText("1 GeV");
> pt1.Draw();
>
> --
> ___________________________________________________________________
> Christian Haeberli christian.haeberli@cern.ch
> University of Bern
> Laboratory for High Energy Physics Phone : ++ 41 31 631 4069
> Sidlerstr. 5 Mobile: ++ 41 76 316 6159
> CH-3012 BERN Fax : ++ 41 31 631 4487
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