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//
//
// $Id:$
//
// 
// --------------------------------------------------------------------
// GEANT 4 class header file
//
// 
// G4OTubs
//
// Class description:
//
//   Temporary copy of original G4Tubs code for use by G4CutTubs.

// --------------------------------------------------------------------
#ifndef G4OTUBS_HH
#define G4OTUBS_HH

#include <CLHEP/Units/PhysicalConstants.h>

#include "G4CSGSolid.hh"
#include "G4Polyhedron.hh"

class G4OTubs : public G4CSGSolid
{
  public:  // with description

    G4OTubs( const G4String& pName,
                   G4double pRMin,
                   G4double pRMax,
                   G4double pDz,
                   G4double pSPhi,
                   G4double pDPhi );
      //
      // Constructs a tubs with the given name and dimensions

    virtual ~G4OTubs();
      //
      // Destructor

    // Accessors
    
    inline G4double GetInnerRadius   () const;
    inline G4double GetOuterRadius   () const;
    inline G4double GetZHalfLength   () const;
    inline G4double GetStartPhiAngle () const;
    inline G4double GetDeltaPhiAngle () 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();

    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=G4bool(false),
                                 G4bool *validNorm=0, G4ThreeVector *n=0) 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

    G4OTubs(__void__&);
      //
      // Fake default constructor for usage restricted to direct object
      // persistency for clients requiring preallocation of memory for
      // persistifiable objects.

    G4OTubs(const G4OTubs& rhs);
    G4OTubs& operator=(const G4OTubs& 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:

    G4ThreeVectorList*
    CreateRotatedVertices( const G4AffineTransform& pTransform ) const;
      //
      // Creates the List of transformed vertices in the format required
      // for G4VSolid:: ClipCrossSection and ClipBetweenSections

    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

    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

    G4double fRMin, fRMax, fDz, fSPhi, fDPhi;
      //
      // Radial and angular dimensions

    G4double sinCPhi, cosCPhi, cosHDPhiOT, cosHDPhiIT,
             sinSPhi, cosSPhi, sinEPhi, cosEPhi;
      //
      // Cached trigonometric values

    G4bool fPhiFullTube;
      //
      // Flag for identification of section or full tube

    G4double halfCarTolerance, halfRadTolerance, halfAngTolerance;
      //
      // Cached half tolerance values
};

#include "G4OTubs.icc"

#endif