G4TwistTubsSide.hh

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// G4TwistTubsSide
//
// Class description:
//
// Class describing a twisted boundary surface for a cylinder.
 
// 01-Aug-2002 - Kotoyo Hoshina ([email protected]), created
// 13-Nov-2003 - O.Link ([email protected]), Integration in Geant4
//               from original version in Jupiter-2.5.02 application.
// --------------------------------------------------------------------
#ifndef G4TWISTTUBSSIDE_HH
#define G4TWISTTUBSSIDE_HH
 
#include "G4VTwistSurface.hh"
 
class G4TwistTubsSide : public G4VTwistSurface
{
  public:
   
    G4TwistTubsSide(const G4String&         name,
                    const G4RotationMatrix& rot,   // 0.5*(phi-width segment)
                    const G4ThreeVector&    tlate,
                          G4int    handedness, // R-hand = 1, L-hand = -1
                    const G4double kappa,      // tan(TwistAngle/2)/fZHalfLen
                    const EAxis    axis0 = kXAxis,
                    const EAxis    axis1 = kZAxis,
                          G4double axis0min = -kInfinity,
                          G4double axis1min = -kInfinity,
                          G4double axis0max = kInfinity,
                          G4double axis1max = kInfinity );
 
    G4TwistTubsSide(const G4String& name,
                          G4double  EndInnerRadius[2],
                          G4double  EndOuterRadius[2],
                          G4double  DPhi,
                          G4double  EndPhi[2],
                          G4double  EndZ[2], 
                          G4double  InnerRadius,
                          G4double  OuterRadius,
                          G4double  Kappa,
                          G4int     handedness);
 
   ~G4TwistTubsSide() override;
 
    G4ThreeVector GetNormal(const G4ThreeVector& xx,
                                  G4bool isGlobal = false) override ;   
 
    G4int DistanceToSurface(const G4ThreeVector& gp,
                            const G4ThreeVector& gv,
                                  G4ThreeVector  gxx[],
                                  G4double  distance[],
                                  G4int     areacode[],
                                  G4bool    isvalid[],
                            EValidate validate = kValidateWithTol) override;
 
    G4int DistanceToSurface(const G4ThreeVector& gp,
                                  G4ThreeVector  gxx[],
                                  G4double       distance[],
                                  G4int          areacode[]) override;
 
    inline G4ThreeVector ProjectAtPXPZ(const G4ThreeVector& p,
                                             G4bool isglobal = false) const ;
 
    inline G4ThreeVector SurfacePoint(G4double, G4double,
                                      G4bool isGlobal = false) override ;  
    inline G4double GetBoundaryMin(G4double phi) override ;
    inline G4double GetBoundaryMax(G4double phi) override ;
    inline G4double GetSurfaceArea() override ;
    void GetFacets( G4int m, G4int n, G4double xyz[][3],
                    G4int faces[][4], G4int iside ) override ;
 
    G4TwistTubsSide(__void__&);
      // Fake default constructor for usage restricted to direct object
      // persistency for clients requiring preallocation of memory for
      // persistifiable objects.
 
  private:
 
    G4double DistanceToPlane(const G4ThreeVector& p,
                             const G4ThreeVector& A,
                             const G4ThreeVector& B,
                             const G4ThreeVector& C,
                             const G4ThreeVector& D,
                             const G4int          parity,
                                   G4ThreeVector& xx,
                                   G4ThreeVector& n);
 
    G4int GetAreaCode(const G4ThreeVector& xx, 
                            G4bool         withTol = true) override;
 
    void SetCorners() override;
 
    void SetCorners( G4double endInnerRad[2],
                     G4double endOuterRad[2],
                     G4double endPhi[2],
                     G4double endZ[2] ) ;
 
    void SetBoundaries() override;
 
  private:
 
    G4double       fKappa;          // std::tan(TwistedAngle/2)/HalfLenZ;
};   
 
 
//========================================================
// inline functions
//========================================================
 
inline
G4ThreeVector G4TwistTubsSide::ProjectAtPXPZ(const G4ThreeVector& p, 
                                                   G4bool isglobal) const 
{
  // Get Rho at p.z() on Hyperbolic Surface.
  G4ThreeVector tmpp;
  if (isglobal) { tmpp = fRot.inverse()*p - fTrans; }
  else          { tmpp = p; }
  G4ThreeVector xx(p.x(), p.x() * fKappa * p.z(), p.z());
  if (isglobal) { return (fRot * xx + fTrans); }
  return xx;
}
 
inline
G4ThreeVector
G4TwistTubsSide::SurfacePoint(G4double x, G4double z, G4bool isGlobal)
{
  G4ThreeVector SurfPoint( x , x * fKappa * z , z ) ;
 
  if (isGlobal) { return (fRot * SurfPoint + fTrans); }
  return SurfPoint;
}
 
inline
G4double G4TwistTubsSide::GetBoundaryMin(G4double)
{
  return  fAxisMin[0] ;  // inner radius at z = 0
}
 
inline
G4double G4TwistTubsSide::GetBoundaryMax(G4double)
{
  return  fAxisMax[0] ;  // outer radius at z = 0
}
 
inline
G4double G4TwistTubsSide::GetSurfaceArea()
{
  // approximation only
  return ( fAxisMax[0] - fAxisMin[0] ) * ( fAxisMax[1] - fAxisMin[1] ) ;
}
 
#endif