BDSTrajectoryPrimary.cc

/* 
Beam Delivery Simulation (BDSIM) Copyright (C) BDSIM Collaboration, 2001 - 2026.
 
This file is part of BDSIM.
 
BDSIM is free software: you can redistribute it and/or modify 
it under the terms of the GNU General Public License as published 
by the Free Software Foundation version 3 of the License.
 
BDSIM is distributed in the hope that it will be useful, but 
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with BDSIM.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "BDSBeamline.hh"
#include "BDSBeamlineElement.hh"
#include "BDSTrajectoryPoint.hh"
#include "BDSTrajectoryPrimary.hh"
 
#include "globals.hh" // geant4 globals / types
#include "G4Allocator.hh"
#include "G4Step.hh"
#include "G4Track.hh"
#include "G4TrajectoryContainer.hh"
 
#include <ostream>
#include <set>
 
G4Allocator<BDSTrajectoryPrimary> bdsTrajectoryPrimaryAllocator;
G4bool BDSTrajectoryPrimary::hasScatteredThisTurn = false;
 
BDSTrajectoryPrimary::BDSTrajectoryPrimary(const G4Track* aTrack,
                                           G4bool         interactiveIn,
                                           const BDS::TrajectoryOptions& storageOptionsIn,
                                           G4bool         storeTrajectoryPointsIn):
  BDSTrajectory(aTrack,
                interactiveIn,
                storageOptionsIn),
  firstHit(nullptr),
  lastPoint(nullptr),
  storeTrajectoryPoints(storeTrajectoryPointsIn)
{;}
 
BDSTrajectoryPrimary::~BDSTrajectoryPrimary()
{
  delete firstHit;
  delete lastPoint;
}
 
void BDSTrajectoryPrimary::AppendStep(const G4Step* aStep)
{
  if (aStep->GetTrack()->GetTrackStatus() != G4TrackStatus::fAlive)
    {
      // particle is being killed, ie end of track. update last point
      delete lastPoint;
      lastPoint = new BDSTrajectoryPoint(aStep, true, true, true);
    }
  
  G4bool isScatteringPoint = BDSTrajectoryPoint::IsScatteringPoint(aStep);
  
  // if we don't have a first hit already and it's a scattering point, record it
  if (!firstHit && isScatteringPoint)
    {
      firstHit = new BDSTrajectoryPoint(aStep, true, true, true);
      hasScatteredThisTurn = true;
    }
  else if (isScatteringPoint && !hasScatteredThisTurn)
    {hasScatteredThisTurn = true;}
  // already a first hit scattering point but need to know if it scattered at all on this turn
  // hasScatteredThisTurn is externally updated (reset) each turn in a circular machine
  
  if (storeTrajectoryPoints)
    {
      if (lastPoint) // copy it if we've already done the work of preparing the point
        {BDSTrajectory::AppendStep(lastPoint);}
      else
        {BDSTrajectory::AppendStep(aStep);}
    }
}
 
void BDSTrajectoryPrimary::MergeTrajectory(G4VTrajectory* secondTrajectory)
{
  BDSTrajectory::MergeTrajectory(secondTrajectory);
  if (secondTrajectory)
    {
      auto prim = dynamic_cast<BDSTrajectoryPrimary*>(secondTrajectory);
      if (prim)
        {
          if (prim->LastPoint())
            {
              delete lastPoint;
              lastPoint = new BDSTrajectoryPoint(*prim->LastPoint());
            }
        }
    }
}
 
std::ostream& operator<< (std::ostream& out, BDSTrajectoryPrimary const& t)
{
  if (t.firstHit)
    {out << "First hit: " << t.firstHit << G4endl;}
  else
    {out << "No first hit" << G4endl;}
  if (t.lastPoint)
    {out << "Last point: " << t.lastPoint << G4endl;}
  else
    {out << "No last point" << G4endl;}
 
  const BDSTrajectory& b(t);
  out << b;
  return out;
}