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/// \file persistency/gdml/G02/src/G02ChamberParameterisation.cc
/// \brief Implementation of the G02ChamberParameterisation class
//
//
// $Id: G02ChamberParameterisation.cc 68025 2013-03-13 13:43:46Z gcosmo $
//
// Class G02ChamberParameterisation implementation
//
// ----------------------------------------------------------------------------

#include "G02ChamberParameterisation.hh"

#include "G4ThreeVector.hh"
#include "G4Box.hh"
#include "G4VPhysicalVolume.hh"

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G02ChamberParameterisation::
G02ChamberParameterisation( G4int    NoChambers, 
                         G4double startZ,          //  Z of center of first 
                         G4double spacingZ,        //  Z spacing of centers
                         G4double widthChamber, 
                         G4double lengthInitial, 
                         G4double lengthFinal )
 : G4VPVParameterisation()
{
  fNoChambers =  NoChambers; 
  fStartZ     =  startZ; 
  fHalfWidth  =  widthChamber*0.5;
  fSpacing    =  spacingZ;
  fHalfLengthFirst = 0.5 * lengthInitial; 

  if( NoChambers > 0 )
  {
    fHalfLengthIncr = 0.5 * (lengthFinal-lengthInitial)/NoChambers;
    if (spacingZ < widthChamber)
    {
      G4Exception("ExN02G02ChamberParameterisation::G02ChamberParameterisation()",
                  "InvalidSetup", FatalException,
                  "Invalid construction: Width>Spacing");
    }
  }
}

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G02ChamberParameterisation::~G02ChamberParameterisation()
{}

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void G02ChamberParameterisation::
ComputeTransformation (const G4int copyNo, G4VPhysicalVolume* physVol) const
{
  G4double Zposition = fStartZ + (copyNo+1) * fSpacing;
  G4ThreeVector origin(0.,0.,Zposition);
  physVol->SetTranslation(origin);
  physVol->SetRotation(0);
}

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void G02ChamberParameterisation::
ComputeDimensions (G4Box& trackerChamber, const G4int copyNo,
                   const G4VPhysicalVolume*) const
{
  G4double halfLength = fHalfLengthFirst + copyNo * fHalfLengthIncr;
  trackerChamber.SetXHalfLength(halfLength);
  trackerChamber.SetYHalfLength(halfLength);
  trackerChamber.SetZHalfLength(fHalfWidth);
}

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