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//
// $Id: G4Cons.hh,v 1.21 2008/11/06 11:04:00 gcosmo Exp $
// GEANT4 tag $Name: geant4-09-02-cand-01 $
//
//
// --------------------------------------------------------------------
// GEANT 4 class header file
//
// G4Cons
//
// Class description:
//
//   A G4Cons is, in the general case, a Phi segment of a cone, with
//   half-length fDz, inner and outer radii specified at -fDz and +fDz.
//   The Phi segment is described by a starting fSPhi angle, and the
//   +fDPhi delta angle for the shape.
//   If the delta angle is >=2*pi, the shape is treated as continuous
//   in Phi
//
//   Member Data:
//
//  fRmin1  inside radius at  -fDz
//  fRmin2  inside radius at  +fDz
//  fRmax1  outside radius at -fDz
//  fRmax2  outside radius at +fDz
//  fDz  half length in z
//
//  fSPhi  starting angle of the segment in radians
//  fDPhi  delta angle of the segment in radians
//
//  fPhiFullCone   Boolean variable used for indicate the Phi Section
//
//   Note:
//      Internally fSPhi & fDPhi are adjusted so that fDPhi<=2PI,
//      and fDPhi+fSPhi<=2PI. This enables simpler comparisons to be
//      made with (say) Phi of a point.

// History:
// 19.3.94 P.Kent: Old C++ code converted to tolerant geometry
// 13.9.96 V.Grichine: Final modifications to commit
// --------------------------------------------------------------------

#ifndef G4Cons_HH
#define G4Cons_HH

#include "G4CSGSolid.hh"

class G4Cons : public G4CSGSolid
{
  public:  // with description

    G4Cons(const G4String& pName,
                 G4double pRmin1, G4double pRmax1,
                 G4double pRmin2, G4double pRmax2,
                 G4double pDz,
                 G4double pSPhi, G4double pDPhi);
         
    virtual ~G4Cons() ;

    // Accessors

    inline G4double    GetInnerRadiusMinusZ() const;
    inline G4double    GetOuterRadiusMinusZ() const;
    inline G4double    GetInnerRadiusPlusZ()  const;
    inline G4double    GetOuterRadiusPlusZ()  const;
  
    inline G4double    GetZHalfLength()       const;
  
    inline G4double    GetStartPhiAngle () const;
    inline G4double    GetDeltaPhiAngle () const;
  
    // Modifiers

    inline void    SetInnerRadiusMinusZ( G4double Rmin1 );
    inline void    SetOuterRadiusMinusZ( G4double Rmax1 );
    inline void    SetInnerRadiusPlusZ ( G4double Rmin2 );
    inline void    SetOuterRadiusPlusZ ( G4double Rmax2 );
         
    inline void    SetZHalfLength      ( G4double newDz );
    inline void    SetStartPhiAngle    ( G4double newSPhi);
    inline void    SetDeltaPhiAngle    ( G4double newDPhi);

    // Other methods for solid

    inline G4double    GetCubicVolume();
    inline G4double    GetSurfaceArea();

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

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

    // Visualisation functions

    void          DescribeYourselfTo( G4VGraphicsScene& scene ) const;
    G4Polyhedron* CreatePolyhedron() const;
    G4NURBS*      CreateNURBS() const;

  public:  // without description
       
    G4Cons(__void__&);
      //
      // Fake default constructor for usage restricted to direct object
      // persistency for clients requiring preallocation of memory for
      // persistifiable objects.

    //  Old access functions

    inline G4double    GetRmin1() const;
    inline G4double    GetRmax1() const;
    inline G4double    GetRmin2() const;
    inline G4double    GetRmax2() const;
  
    inline G4double    GetDz()    const;
  
    inline G4double    GetSPhi() const;
    inline G4double    GetDPhi() const;

  protected:
 
    G4ThreeVectorList*
    CreateRotatedVertices(const G4AffineTransform& pTransform) const;
  
    G4double fRmin1, fRmin2, fRmax1, fRmax2, fDz, fSPhi, fDPhi;
    G4bool fPhiFullCone;

    // Used by distanceToOut
  
    enum ESide {kNull,kRMin,kRMax,kSPhi,kEPhi,kPZ,kMZ};
  
    // used by normal
  
    enum ENorm {kNRMin,kNRMax,kNSPhi,kNEPhi,kNZ};

  private:

    inline void Initialise();
      // Reset relevant values to zero

    inline void InitializeTrigonometry();
      //
      // Recompute relevant trigonometric values and cache them

    G4ThreeVector ApproxSurfaceNormal(const G4ThreeVector& p) const;
      //
      // Algorithm for SurfaceNormal() following the original
      // specification for points not on the surface

  private:

    G4double kRadTolerance, kAngTolerance;
      //
      // Radial and angular tolerances

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

#include "G4Cons.icc"

#endif
