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// $Id: G4TouchableHistory.cc,v 1.15 2009/11/06 11:10:35 gcosmo Exp $
// GEANT4 tag $Name: geant4-09-03 $
//
// 
// class G4TouchableHistory Implementation
//
// ----------------------------------------------------------------------

#include "G4TouchableHistory.hh"

G4Allocator<G4TouchableHistory> aTouchableHistoryAllocator;

G4TouchableHistory::G4TouchableHistory()
  : frot(G4RotationMatrix()),
    ftlate(G4ThreeVector(0.,0.,0.)),
    fhistory()
{
   G4VPhysicalVolume* pPhysVol=0;
   fhistory.SetFirstEntry(pPhysVol);
}

G4TouchableHistory::G4TouchableHistory( const G4NavigationHistory &history )
  : fhistory(history)
{
  G4AffineTransform tf(fhistory.GetTopTransform().Inverse());
  ftlate = tf.NetTranslation();
  frot = tf.NetRotation();
}

G4TouchableHistory::~G4TouchableHistory()
{
}

const G4ThreeVector&
G4TouchableHistory::GetTranslation(G4int depth) const
{
  // The value returned will change at the next call
  // Copy it if you want to use it!
  //
  static G4ThreeVector currTranslation;
  if(depth==0.0)
  {
    return ftlate;
  }
  else
  {
    currTranslation =
      fhistory.GetTransform(CalculateHistoryIndex(depth)).NetTranslation();
    return currTranslation;
  }
}

const G4RotationMatrix*
G4TouchableHistory::GetRotation(G4int depth) const
{
  // The value returned will change at the next call
  // Copy it if you want to use it!
  //
  static G4RotationMatrix rotM;

  if(depth==0.0)
  {
    return &frot;
  }
  else
  {
    rotM = fhistory.GetTransform(CalculateHistoryIndex(depth)).NetRotation();
    return &rotM;
  }
}