#include <TH2F.h>
#include <TRandom3.h>
#include <TMarker.h>
#include <TCanvas.h>
#include <TStyle.h>

void
markerTest()
{

  gStyle->SetOptStat(0);
  TH2F* h2 = new TH2F( "h2", "h2; var 1; var 2", 50, 0.0, 1.0, 50, 0.0, 1.0 );
  TRandom3 r(731980);

  for( Int_t i(0); i<1000000; ++i )
    {
      Double_t xval = r.Gaus( 0.5, 0.5 );
      Double_t yval = r.Gaus( 0.6, 0.3 );

      h2->Fill( xval, yval );
    }
  
  TH2F* h2c = (TH2F*)h2->Clone( "h2c" );

  TCanvas* c1 = new TCanvas( "c1", "c1", 910, 420 );
  c1->Divide(2,1);

  TMarker* m1 = new TMarker( 0.3, 0.3, 29 ); m1->SetMarkerSize(2);
  TMarker* m2 = new TMarker( 0.3, 0.3, 29 ); m2->SetMarkerSize(2);

  c1->cd(1); h2 ->Draw( "colz"  ); m1->Draw();
  c1->cd(2); h2c->Draw( "cont4z"); m2->Draw();

  return;
}