G4Tubs.hh

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//
// G4Tubs
//
// Class description:
//
//   A tube or tube segment with curved sides parallel to
//   the z-axis. The tube has a specified half-length along
//   the z-axis, about which it is centered, and a given
//   minimum and maximum radius. A minimum radius of 0
//   corresponds to filled tube /cylinder. The tube segment is
//   specified by starting and delta angles for phi, with 0
//   being the +x axis, PI/2 the +y axis.
//   A delta angle of 2PI signifies a complete, unsegmented
//   tube/cylinder.
//
//   Member Data:
//
//   fRMin  Inner radius
//   fRMax  Outer radius
//   fDz  half length in z
//
//   fSPhi  The starting phi angle in radians,
//          adjusted such that fSPhi+fDPhi<=2PI, fSPhi>-2PI
//
//   fDPhi  Delta angle of the segment.
//
//   fPhiFullTube   Boolean variable used for indicate the Phi Section
 
// 23.01.94 P.Kent: First version. Converted to `tolerant' geometry
// --------------------------------------------------------------------
#ifndef G4TUBS_HH
#define G4TUBS_HH
 
#include "G4GeomTypes.hh"
 
#if defined(G4GEOM_USE_USOLIDS)
#define G4GEOM_USE_UTUBS 1
#endif
 
#if defined(G4GEOM_USE_UTUBS)
  #define G4UTubs G4Tubs
  #include "G4UTubs.hh"
#else
 
#include <CLHEP/Units/PhysicalConstants.h>
 
#include "G4CSGSolid.hh"
#include "G4Polyhedron.hh"
 
class G4Tubs : public G4CSGSolid
{
  public:
 
    G4Tubs( const G4String& pName,
                  G4double pRMin,
                  G4double pRMax,
                  G4double pDz,
                  G4double pSPhi,
                  G4double pDPhi );
      //
      // Constructs a tubs with the given name and dimensions
 
    ~G4Tubs() override;
      //
      // Destructor
 
    // Accessors
 
    inline G4double GetInnerRadius   () const;
    inline G4double GetOuterRadius   () const;
    inline G4double GetZHalfLength   () const;
    inline G4double GetStartPhiAngle () const;
    inline G4double GetDeltaPhiAngle () const;
    inline G4double GetSinStartPhi   () const;
    inline G4double GetCosStartPhi   () const;
    inline G4double GetSinEndPhi     () const;
    inline G4double GetCosEndPhi     () const;
 
    // Modifiers
 
    inline void SetInnerRadius   (G4double newRMin);
    inline void SetOuterRadius   (G4double newRMax);
    inline void SetZHalfLength   (G4double newDz);
    inline void SetStartPhiAngle (G4double newSPhi, G4bool trig=true);
    inline void SetDeltaPhiAngle (G4double newDPhi);
 
    // Methods for solid
 
    inline G4double GetCubicVolume() override;
    inline G4double GetSurfaceArea() override;
 
    void ComputeDimensions(       G4VPVParameterisation* p,
                            const G4int n,
                            const G4VPhysicalVolume* pRep ) override;
 
    void BoundingLimits(G4ThreeVector& pMin, G4ThreeVector& pMax) const override;
 
    G4bool CalculateExtent(const EAxis pAxis,
                           const G4VoxelLimits& pVoxelLimit,
                           const G4AffineTransform& pTransform,
                                 G4double& pmin, G4double& pmax) const override;
 
    EInside Inside( const G4ThreeVector& p ) const override;
 
    G4ThreeVector SurfaceNormal( const G4ThreeVector& p ) const override;
 
    G4double DistanceToIn(const G4ThreeVector& p,
                          const G4ThreeVector& v) const override;
    G4double DistanceToIn(const G4ThreeVector& p) const override;
    G4double DistanceToOut(const G4ThreeVector& p, const G4ThreeVector& v,
                           const G4bool calcNorm = false,
                                 G4bool* validNorm = nullptr,
                                 G4ThreeVector* n = nullptr) const override;
    G4double DistanceToOut(const G4ThreeVector& p) const override;
 
    G4GeometryType GetEntityType() const override;
 
    G4ThreeVector GetPointOnSurface() const override;
 
    G4VSolid* Clone() const override;
 
    std::ostream& StreamInfo( std::ostream& os ) const override;
 
    // Visualisation functions
 
    void          DescribeYourselfTo (G4VGraphicsScene& scene) const override;
    G4Polyhedron* CreatePolyhedron   () const override;
 
    G4Tubs(__void__&);
      //
      // Fake default constructor for usage restricted to direct object
      // persistency for clients requiring preallocation of memory for
      // persistifiable objects.
 
    G4Tubs(const G4Tubs& rhs);
    G4Tubs& operator=(const G4Tubs& rhs);
      // Copy constructor and assignment operator.
 
  protected:
 
    inline void Initialize();
      //
      // Reset relevant values to zero
 
    inline void CheckSPhiAngle(G4double sPhi);
    inline void CheckDPhiAngle(G4double dPhi);
    inline void CheckPhiAngles(G4double sPhi, G4double dPhi);
      //
      // Reset relevant flags and angle values
 
    inline void InitializeTrigonometry();
      //
      // Recompute relevant trigonometric values and cache them
 
    inline G4double FastInverseRxy( const G4ThreeVector& pos, G4double invRad,
                                    G4double normalTolerance ) const;
      //
      // Compute fast inverse cylindrical (Rxy) radius for points expected to
      // be on a cylindrical surface. Ensures that surface normal vector
      // produced has magnitude with 'normalTolerance' of unit
 
    virtual G4ThreeVector ApproxSurfaceNormal( const G4ThreeVector& p ) const;
      //
      // Algorithm for SurfaceNormal() following the original
      // specification for points not on the surface
 
  protected:
 
    // Used by distanceToOut
    //
    enum ESide {kNull,kRMin,kRMax,kSPhi,kEPhi,kPZ,kMZ};
 
    // Used by normal
    //
    enum ENorm {kNRMin,kNRMax,kNSPhi,kNEPhi,kNZ};
 
    G4double kRadTolerance, kAngTolerance;
      //
      // Radial and angular tolerances
 
    static constexpr G4double kNormTolerance = 1.0e-6;
      //
      // Tolerance of unity for surface normal
      // (for speedup - use fInvRmax if possible )
 
    G4double fRMin, fRMax, fDz, fSPhi, fDPhi;
      //
      // Radial and angular dimensions
 
    G4double sinCPhi, cosCPhi, cosHDPhi, cosHDPhiOT, cosHDPhiIT,
             sinSPhi, cosSPhi, sinEPhi, cosEPhi;
      //
      // Cached trigonometric values
 
    G4bool fPhiFullTube;
      //
      // Flag for identification of section or full tube
 
    G4double fInvRmax, fInvRmin;
      //
      // More cached values - inverse of Rmax, Rmin.
 
    G4double halfCarTolerance, halfRadTolerance, halfAngTolerance;
      //
      // Cached half tolerance values
};
 
#include "G4Tubs.icc"
 
#endif
 
#endif