CCAL_occupancy.C

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//
// Guidance: --------------------------------------------
//
// End Guidance: ----------------------------------------
//
//
//
// The following are special comments used by RootSpy to know
// which histograms to fetch for the macro.
//
// hnamepath: /occupancy/ccal_occ
// hnamepath: /occupancy/ccal_num_events
//
// e-mail: davidl@jlab.org
// e-mail: staylor@jlab.org
// e-mail: somov@jlab.org
// e-mail: tbritton@jlab.org
//

{
   // RootSpy saves the current directory and style before
   // calling the macro and restores it after so it is OK to
   // change them and not change them back.
        TDirectory *savedir = gDirectory;
   TDirectory *dir = (TDirectory*)gDirectory->FindObjectAny("occupancy");
   if(dir) dir->cd();

   TH2I *ccal_occ = (TH2I*)gDirectory->FindObjectAny("ccal_occ");
   TH1I *ccal_num_events = (TH1I*)gDirectory->FindObjectAny("ccal_num_events");

   double Nevents = 1.0;
   if(ccal_num_events) Nevents = (double)ccal_num_events->GetBinContent(1);

   TLegend *legend_sa = new TLegend(0.1,0.85,0.3,0.9);
   if(ccal_occ)legend_sa->AddEntry(ccal_occ, "fADC","f");

   // Just for testing
   if(gPad == NULL){
      TCanvas *c1 = new TCanvas("c1");
      c1->cd(0);
      c1->Draw();
      c1->Update();
   }
   if(!gPad) {savedir->cd(); return;}

   TCanvas *c1 = gPad->GetCanvas();
   c1->cd(0);
   c1->Clear();

   gPad->SetTicks();
   gPad->SetGrid();
   gPad->SetRightMargin(2.0);
   gPad->SetLeftMargin(2.0);
   if(ccal_occ){
      ccal_occ->SetStats(0);
      TH1* h = ccal_occ->DrawCopy("colz");
      h->Scale(1./Nevents);
      h->GetZaxis()->SetRangeUser(0.0001, 0.25);
      
      char str[256];
      sprintf(str,"%0.0f events", Nevents);
      TLatex lat(30.0, 61.75, str);
      lat.SetTextAlign(22);
      lat.SetTextSize(0.035);
      lat.Draw();
   }

   legend_sa->Draw();

}