// root macro to analyze the simulation output
//void convertMCPoints()
{

  // -----  Load libraries   ------------------------------------------------
//``gSystem->Load("fstream.h");
  gROOT->LoadMacro("$VMCWORKDIR/gconfig/basiclibs.C");
  basiclibs();
  gSystem->Load("libGeoBase");
  gSystem->Load("libParBase");
  gSystem->Load("libBase");
  gSystem->Load("libMCStack");
  gSystem->Load("libField");
  gSystem->Load("libGen");
  gSystem->Load("libPassive");
  gSystem->Load("libMvd");
  // -----   Timer   --------------------------------------------------------
  TStopwatch timer;
  timer.Start();
  // ------------------------------------------------------------------------

/*
Convert PndMvdWaferMCPoints to the STAR Format (text, "x y z layer")
for the conformal mapping stuff
*/

  PndMvdFileNameCreator namecreator("/home/ralfk/MVD/mvdmacros/data/mvdevalg4.root");
  std::string inFile = namecreator.GetSimFileName(false);

  TFile* f = new TFile(inFile.c_str()); // the sim file you want to analyse
  TTree *t=(TTree *) f->Get("cbmsim") ;
  TClonesArray* hit_array=new TClonesArray("PndMvdMCPoint");
  t->SetBranchAddress("MVDPoint",&hit_array);//Branch names

  TClonesArray* mc_array=new TClonesArray("CbmMCTrack");
  t->SetBranchAddress("MCTrack",&mc_array);//Branch names

  TH2D* hisxy = new TH2D("hisxy","MVD MC Points, xy view",400,-15.,15.,400,-15.,15.);
  TH2D* hisrz = new TH2D("hisrz","MVD MC Points, rz view",400,-20.,20.,400,-15.,25.);
  TH1D* hisde = new TH1D("hisde","MVD MC Points, Energyloss",500,0.,0.002);
  TH2D* hisdedx = new TH2D("hisdedx","MVD MC Points, dE/dx",200,0.,1.,200,0.,0.002);

  int  nEvents = 1000;
  bool verbose = false;

  TVector3 vecs,veco;
  TVector3 vecFront,vecBack,vecP;
  Double_t dx,dE,p,dEdX;

  for (Int_t j=0; j<nEvents && j<t->GetEntriesFast(); j++)
  {
    t->GetEntry(j);
    if(verbose) cout<<"Event No "<<j<<endl;
    for (Int_t i=0; i<hit_array->GetEntriesFast(); i++)
    {
      if(verbose) cout<<"Point No "<<i<<endl;
      PndMvdMCPoint *hit=(PndMvdMCPoint*)hit_array->At(i);
      int mcpdg = -1;

      //CbmMCTrack *mctruth = (CbmMCTrack*)mc_array->At(hit->GetTrackID());
      //mcpdg = mctruth->GetPdgCode();
      //cout<<"mcpdg="<<mcpdg<<endl;

      vecs.SetXYZ(hit->GetX(), hit->GetY(), hit->GetZ());
      veco.SetXYZ(hit->GetXOut(),hit->GetYOut(),hit->GetZOut());
      vecP.SetXYZ(hit->GetPxOut(),hit->GetPyOut(),hit->GetPzOut());
      dx=(veco-vecs).Mag();
      dE=hit->GetEnergyLoss();
      p=vecP.Mag();
      Int_t layer = Int_t(10.*vecs->Mag());
      if(verbose) cout<<vecs.x()<<"\t"<<vecs.y()<<"\t"<<vecs.z()<<endl;

      hisxy->Fill(vecs.x(),vecs.y());
      hisrz->Fill(vecs.z(),((vecs.y()>0.)?1.:-1.)*vecs.Perp());
      hisde->Fill(hit->GetEnergyLoss());

      if(dx!=0)
      {
        dEdX=(dE/dx);
        hisdedx->Fill(p,dE);
      }

    }//end for i (points in event)
  }// end for j (events)

TCanvas* can1 = new TCanvas("can1","MCHit view in MVD",0,0,800,800);
can1->Divide(2,2);
can1->cd(1);  
hisxy->DrawCopy("colz");
can1->cd(2);
hisrz->DrawCopy("colz");
can1->cd(3);
gPad->SetLogy();
hisde->DrawCopy("");
can1->cd(4);
hisdedx->DrawCopy("colz");
can1->Print("outAnaMvdSim.ps");




  // -----   Finish   -------------------------------------------------------
  timer.Stop();
  Double_t rtime = timer.RealTime();
  Double_t ctime = timer.CpuTime();
  cout << endl << endl;
  cout << "Macro finished succesfully." << endl;
  //cout << "Output file is "    << outFile << endl;
  //cout << "Parameter file is " << parFile << endl;
  cout << "Real time " << rtime << " s, CPU time " << ctime << " s" << endl;
  cout << endl;
  // ------------------------------------------------------------------------

}