hist062_TH1_timeonaxis2.C

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/// \file
/// \ingroup tutorial_hist
/// \notebook
/// \preview Define the time offset as 2003, January 1st.
///
/// \macro_image
/// \macro_code
///
/// \author Olivier Couet
 
void hist062_TH1_timeonaxis2()
{
   auto ct2 = new TCanvas("ct2", "ct2", 10, 10, 700, 500);
 
   TDatime T0(2003, 1, 1, 0, 0, 0);
   int X0 = T0.Convert();
   gStyle->SetTimeOffset(X0);
 
   // Define the lowest histogram limit as 2002, September 23rd
   TDatime T1(2002, 9, 23, 0, 0, 0);
   int X1 = T1.Convert() - X0;
 
   // Define the highest histogram limit as 2003, March 7th
   TDatime T2(2003, 3, 7, 0, 0, 0);
   int X2 = T2.Convert(1) - X0;
 
   auto h1 = new TH1F("h1", "test", 100, X1, X2);
 
   TRandom r;
   for (Int_t i = 0; i < 30000; i++) {
      Double_t noise = r.Gaus(0.5 * (X1 + X2), 0.1 * (X2 - X1));
      h1->Fill(noise);
   }
 
   h1->GetXaxis()->SetTimeDisplay(1);
   h1->GetXaxis()->SetLabelSize(0.03);
   h1->GetXaxis()->SetTimeFormat("%Y/%m/%d");
   h1->Draw();
}