How to set Title when superimposing two histograms?

ROOT
1

I superimpose two histograms:

 TH1F *data1 = new TH1F("without_KF", "without_KF",100,0,400 );
    t1->Project("without_KF", "pi0pi0");
    //e_data->Scale(1./scale_e);
    data1->Draw();
    c->Update();
    TH1F *data2 = new TH1F("with_KF", "with_KF",100,0,400);
    t2->Project("with_KF", "pi0pi0");
    data2->SetLineColor(kRed);
    data2->Draw("same");
    c->BuildLegend();

Next I want to set Title in result picture. By default it is the name of the 1st drew hist. And I cannot change it. How to set Title in this case properly?

2

The simplest is to change the title of the histogram data1, either at creation time or using SetTitle on data1.

3

It is bad because I set Legend and if I change title of the hist data1 then in legend it will be too.

4 
{
   auto h1 = new TH1D("h1","h1",100,-2.,2.);
   h1->FillRandom("gaus", 100000);
   h1->Draw();

   auto h2 = new TH1D("h2","h2",100,-2.,2.);
   h2->FillRandom("gaus", 50000);
   h2->Draw("same");
   gPad->Update();

   TPaveText* pt  = (TPaveText*)gPad->FindObject("title");

   TPaveText* ptn = new TPaveText(pt->GetX1(),pt->GetY1(),
                                  pt->GetX2(),pt->GetY2(),"");
   ptn->AddText("New Title");
   ptn->SetBorderSize(0);
   ptn->SetFillColor(0);
   ptn->SetTextFont(42);
   ptn->Draw();

   gPad->BuildLegend();
}
1 Like
5

Though it looks like not the way it works and I do not have any alternative. Thank you.

6

One more. I want to enlarge text. But if I try ptn->SetTextSize(number) I get no text at all.
How to set text size?

7

Sorry it seems like number should be less than zero? Sorry.

8

To enlarge the title you should specify the ton box larger. X1 smaller and X2 bigger.

9

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