labels1.C

Go to the documentation of this file.

/// \file
/// \ingroup tutorial_graphs
/// \notebook
/// Setting alphanumeric labels in a 1-d histogram.
///
/// \macro_image
/// \macro_code
///
/// \author Rene Brun
 
void labels1()
{
   Int_t i;
   const Int_t nx = 20;
   const char *people[nx] = {"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, 900, 500);
   c1->SetGrid();
   c1->SetBottomMargin(0.15);
   TH1F *h = new TH1F("h", "test", nx, 0, nx);
   h->SetFillColor(38);
   for (i = 0; i < 5000; i++)
      h->Fill(gRandom->Gaus(0.5 * nx, 0.2 * nx));
   h->SetStats(0);
   for (i = 1; i <= nx; i++)
      h->GetXaxis()->SetBinLabel(i, people[i - 1]);
   h->Draw();
   TPaveText *pt = new TPaveText(0.6, 0.7, 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();
}