G4TwistTubsSide.hh

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// G4TwistTubsSide
//
// Class description:
//
// Class describing a twisted boundary surface for a cylinder.
 
// 01-Aug-2002 - Kotoyo Hoshina (hoshina@hepburn.s.chiba-u.ac.jp), created
// 13-Nov-2003 - O.Link (Oliver.Link@cern.ch), 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:  // with description
   
   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);
 
   virtual ~G4TwistTubsSide();
   
   virtual G4ThreeVector  GetNormal(const G4ThreeVector& xx,
                                          G4bool isGlobal = false) ;   
   
   virtual G4int DistanceToSurface(const G4ThreeVector& gp,
                                   const G4ThreeVector& gv,
                                         G4ThreeVector  gxx[],
                                         G4double  distance[],
                                         G4int     areacode[],
                                         G4bool    isvalid[],
                                         EValidate validate = kValidateWithTol);
                                                  
   virtual G4int DistanceToSurface(const G4ThreeVector& gp,
                                         G4ThreeVector  gxx[],
                                         G4double       distance[],
                                         G4int          areacode[]);
 
   inline G4ThreeVector ProjectAtPXPZ(const G4ThreeVector& p,
                                            G4bool isglobal = false) const ;
 
   virtual G4ThreeVector SurfacePoint(G4double, G4double,
                                      G4bool isGlobal = false) ;  
   virtual G4double GetBoundaryMin(G4double phi) ;
   virtual G4double GetBoundaryMax(G4double phi) ;
   virtual G4double GetSurfaceArea() ;
   virtual void GetFacets( G4int m, G4int n, G4double xyz[][3],
                           G4int faces[][4], G4int iside ) ;
 
 public:  // without description
 
   G4TwistTubsSide(__void__&);
     // Fake default constructor for usage restricted to direct object
     // persistency for clients requiring preallocation of memory for
     // persistifiable objects.
 
 private:
 
   virtual G4double DistanceToPlane(const G4ThreeVector& p,
                                    const G4ThreeVector& A,
                                    const G4ThreeVector& B,
                                    const G4ThreeVector& C,
                                    const G4ThreeVector& D,
                                    const G4int          parity,
                                          G4ThreeVector& xx,
                                          G4ThreeVector& n);
 
   virtual G4int GetAreaCode(const G4ThreeVector& xx, 
                                   G4bool         withTol = true);
 
   virtual void SetCorners();
 
   virtual void SetCorners(  G4double endInnerRad[2],
                             G4double endOuterRad[2],
                             G4double endPhi[2],
                             G4double endZ[2] ) ;
 
   virtual void SetBoundaries();
 
  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