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// $Id: ExN02ChamberParameterisation.hh,v 1.3.4.1 2001/06/28 19:07:27 gunter Exp $
// GEANT4 tag $Name:  $
//
//
//  A parameterisation that describes a series of boxes along Z
//    The boxes have equal width, & their lengths are a linear equation.
//    They are spaced an equal distance apart, starting from given location.
//
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#ifndef ExN02ChamberParameterisation_H
#define ExN02ChamberParameterisation_H 1

#include "globals.hh"
#include "G4VPVParameterisation.hh"

class G4VPhysicalVolume;
class G4Box;

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class ExN02ChamberParameterisation : public G4VPVParameterisation
{ 
  public:
  
    ExN02ChamberParameterisation(G4int    NoChambers, 
                                 G4double startZ, 
                                 G4double spacing,
                                 G4double widthChamber, 
                                 G4double lengthInitial,
                                 G4double lengthFinal );
				 
   ~ExN02ChamberParameterisation();
   
    void ComputeTransformation (const G4int copyNo,
                                G4VPhysicalVolume* physVol) const;
    
    void ComputeDimensions (G4Box & trackerLayer, const G4int copyNo,
                            const G4VPhysicalVolume* physVol) const;


  private:

    G4int    fNoChambers;   
    G4double fStartZ;
    G4double fHalfWidth;    //  The half-width of each tracker chamber
    G4double fSpacing;      //  The distance between the chambers' center
    G4double fHalfLengthFirst;  //  The first half-length 
    G4double fHalfLengthIncr;   //  The Increment for the half-length 
};

#endif