hist060_TH1_stats.C

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/// \file
/// \ingroup tutorial_hist
/// \notebook
/// \preview Edit statistics box.
///
/// This example shows:
///  - how to remove a stat element from the stat box
///  - how to add a new one
///
/// \macro_image
/// \macro_code
///
/// \date August 2016
/// \author  Olivier Couet
 
void hist060_TH1_stats()
{
   // Create and plot a test histogram with stats
   TCanvas *se = new TCanvas;
   TH1F *h = new TH1F("h", "test", 100, -3, 3);
   h->FillRandom("gaus", 3000);
   gStyle->SetOptStat();
   h->Draw();
   se->Update();
 
   // Retrieve the stat box
   TPaveStats *ps = (TPaveStats *)se->GetPrimitive("stats");
   ps->SetName("mystats");
   TList *listOfLines = ps->GetListOfLines();
 
   // Remove the RMS line
   TText *tconst = ps->GetLineWith("RMS");
   listOfLines->Remove(tconst);
 
   // Add a new line in the stat box.
   // Note that "=" is a control character
   TLatex *myt = new TLatex(0, 0, "Test = 10");
   myt->SetTextFont(42);
   myt->SetTextSize(0.04);
   myt->SetTextColor(kRed);
   listOfLines->Add(myt);
 
   // the following line is needed to avoid that the automatic redrawing of stats
   h->SetStats(0);
 
   se->Modified();
}