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:  // with description

    G4Tubs( const G4String& pName,
                  G4double pRMin,
                  G4double pRMax,
                  G4double pDz,
                  G4double pSPhi,
                  G4double pDPhi );
      //
      // Constructs a tubs with the given name and dimensions

    virtual ~G4Tubs();
      //
      // 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();
    inline G4double GetSurfaceArea();

    void ComputeDimensions(       G4VPVParameterisation* p,
                            const G4int n,
                            const G4VPhysicalVolume* pRep );

    void BoundingLimits(G4ThreeVector& pMin, G4ThreeVector& pMax) const;

    G4bool CalculateExtent( const EAxis pAxis,
                            const G4VoxelLimits& pVoxelLimit,
                            const G4AffineTransform& pTransform,
                                  G4double& pmin, G4double& pmax ) const;

    EInside Inside( const G4ThreeVector& p ) const;

    G4ThreeVector SurfaceNormal( const G4ThreeVector& p ) const;

    G4double DistanceToIn(const G4ThreeVector& p, const G4ThreeVector& v) const;
    G4double DistanceToIn(const G4ThreeVector& p) const;
    G4double DistanceToOut(const G4ThreeVector& p, const G4ThreeVector& v,
                           const G4bool calcNorm = false,
                                 G4bool* validNorm = nullptr,
                                 G4ThreeVector* n = nullptr) const;
    G4double DistanceToOut(const G4ThreeVector& p) const;

    G4GeometryType GetEntityType() const;

    G4ThreeVector GetPointOnSurface() const;

    G4VSolid* Clone() const;

    std::ostream& StreamInfo( std::ostream& os ) const;

    // Visualisation functions

    void                DescribeYourselfTo ( G4VGraphicsScene& scene ) const;
    G4Polyhedron*       CreatePolyhedron   () const;

  public:  // without description

    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.

    //  Older names for access functions

    inline G4double GetRMin() const;
    inline G4double GetRMax() const;
    inline G4double GetDz  () const;
    inline G4double GetSPhi() const;
    inline G4double GetDPhi() const;

  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