hist036_TH2_labels.C

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/// \file
/// \ingroup tutorial_hist
/// \notebook
/// \preview 2-D histograms with alphanumeric labels.
///
/// \macro_image
/// \macro_code
///
/// \date July 2016
/// \author Rene Brun
 
void hist036_TH2_labels()
{
   const Int_t nx = 12;
   const Int_t ny = 20;
   const char *month[nx] = {"January", "February", "March",     "April",   "May",      "June",
                            "July",    "August",   "September", "October", "November", "December"};
   const char *people[ny] = {"Jean",    "Pierre", "Marie",    "Odile",   "Sebastien", "Fons",  "Rene",
                             "Nicolas", "Xavier", "Greg",     "Bjarne",  "Anton",     "Otto",  "Eddy",
                             "Peter",   "Pasha",  "Philippe", "Suzanne", "Jeff",      "Valery"};
   TCanvas *c1 = new TCanvas("c1", "demo bin labels", 10, 10, 600, 600);
   c1->SetGrid();
   c1->SetLeftMargin(0.15);
   c1->SetBottomMargin(0.15);
   TH2F *h = new TH2F("h", "test", 3, 0, 3, 2, 0, 2);
   h->SetCanExtend(TH1::kAllAxes);
   h->SetStats(0);
   gRandom->SetSeed();
   for (Int_t i = 0; i < 15000; i++) {
      Int_t rx = gRandom->Rndm() * nx;
      Int_t ry = gRandom->Rndm() * ny;
      h->Fill(people[ry], month[rx], 1);
   }
   h->LabelsDeflate("X");
   h->LabelsDeflate("Y");
   h->LabelsOption("v");
   h->Draw("text");
 
   TPaveText *pt = new TPaveText(0.6, 0.85, 0.98, 0.98, "brNDC");
   pt->SetFillColor(18);
   pt->SetTextAlign(12);
   pt->AddText("Use the axis Context Menu LabelsOption");
   pt->AddText(" \"a\"   to sort by alphabetic order");
   pt->AddText(" \">\"   to sort by decreasing values");
   pt->AddText(" \"<\"   to sort by increasing values");
   pt->Draw();
}