FairMCTrack.cxx

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/********************************************************************************
 *    Copyright (C) 2014 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH    *
 *                                                                              *
 *              This software is distributed under the terms of the             *
 *              GNU Lesser General Public Licence (LGPL) version 3,             *
 *                  copied verbatim in the file "LICENSE"                       *
 ********************************************************************************/
// -------------------------------------------------------------------------
// -----                      FairMCTrack source file                   -----
// -----                  Created 03/08/04  by V. Friese               -----
// -------------------------------------------------------------------------
#include "FairMCTrack.h"

#include "FairLogger.h"   // for FairLogger, etc

#include <TDatabasePDG.h>   // for TDatabasePDG
#include <TParticle.h>      // for TParticle
#include <TParticlePDG.h>   // for TParticlePDG

FairMCTrack::FairMCTrack()
    : TObject()
    , fPdgCode(0)
    , fMotherId(-1)
    , fPx(0.)
    , fPy(0.)
    , fPz(0.)
    , fStartX(0.)
    , fStartY(0.)
    , fStartZ(0.)
    , fStartT(0.)
    , fNPoints(0)
{}

FairMCTrack::FairMCTrack(Int_t pdgCode,
                         Int_t motherId,
                         Double_t px,
                         Double_t py,
                         Double_t pz,
                         Double_t x,
                         Double_t y,
                         Double_t z,
                         Double_t t,
                         Int_t nPoints = 0)
    : TObject()
    , fPdgCode(pdgCode)
    , fMotherId(motherId)
    , fPx(px)
    , fPy(py)
    , fPz(pz)
    , fStartX(x)
    , fStartY(y)
    , fStartZ(z)
    , fStartT(t)
    , fNPoints(nPoints)
{}

FairMCTrack::FairMCTrack(const FairMCTrack& track)
    : TObject(track)
    , fPdgCode(track.fPdgCode)
    , fMotherId(track.fMotherId)
    , fPx(track.fPx)
    , fPy(track.fPy)
    , fPz(track.fPz)
    , fStartX(track.fStartX)
    , fStartY(track.fStartY)
    , fStartZ(track.fStartZ)
    , fStartT(track.fStartT)
    , fNPoints(track.fNPoints)
{}

FairMCTrack::FairMCTrack(TParticle* part)
    : TObject()
    , fPdgCode(part->GetPdgCode())
    , fMotherId(part->GetMother(0))
    , fPx(part->Px())
    , fPy(part->Py())
    , fPz(part->Pz())
    , fStartX(part->Vx())
    , fStartY(part->Vy())
    , fStartZ(part->Vz())
    , fStartT(part->T() * 1e09)
    , fNPoints(0)
{}

FairMCTrack::~FairMCTrack() {}

void FairMCTrack::Print(Int_t trackId) const
{
    LOG(debug) << "Track " << trackId << ", mother : " << fMotherId << ", Type " << fPdgCode << ", momentum (" << fPx
               << ", " << fPy << ", " << fPz << ") GeV";
    LOG(debug2) << "       Ref " << GetNPoints(kREF) << ", TutDet " << GetNPoints(kTutDet) << ", Rutherford "
                << GetNPoints(kFairRutherford);
}

Double_t FairMCTrack::GetMass() const
{
    if (TDatabasePDG::Instance()) {
        TParticlePDG* particle = TDatabasePDG::Instance()->GetParticle(fPdgCode);
        if (particle) {
            return particle->Mass();
        } else {
            return 0.;
        }
    }
    return 0.;
}

Double_t FairMCTrack::GetRapidity() const
{
    Double_t e = GetEnergy();
    Double_t y = 0.5 * TMath::Log((e + fPz) / (e - fPz));
    return y;
}

Int_t FairMCTrack::GetNPoints(DetectorId detId) const
{
    // TODO: Where does this come from
    if (detId == kREF) {
        return (fNPoints & 1);
    } else if (detId == kTutDet) {
        return ((fNPoints & (7 << 1)) >> 1);
    } else if (detId == kFairRutherford) {
        return ((fNPoints & (31 << 4)) >> 4);
    } else {
        LOG(error) << "Unknown detector ID " << detId;
        return 0;
    }
}

void FairMCTrack::SetNPoints(Int_t iDet, Int_t nPoints)
{
    if (iDet == kREF) {
        if (nPoints < 0) {
            nPoints = 0;
        } else if (nPoints > 1) {
            nPoints = 1;
        }
        fNPoints = (fNPoints & (~1)) | nPoints;
    }

    else if (iDet == kTutDet) {
        if (nPoints < 0) {
            nPoints = 0;
        } else if (nPoints > 7) {
            nPoints = 7;
        }
        fNPoints = (fNPoints & (~(7 << 1))) | (nPoints << 1);
    }

    else if (iDet == kFairRutherford) {
        if (nPoints < 0) {
            nPoints = 0;
        } else if (nPoints > 31) {
            nPoints = 31;
        }
        fNPoints = (fNPoints & (~(31 << 4))) | (nPoints << 4);
    }

    else
        LOG(error) << "Unknown detector ID " << iDet;
}

ClassImp(FairMCTrack);