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// $Id: G4Sphere.hh,v 1.21 2008/11/21 09:50:05 gcosmo Exp $
// GEANT4 tag $Name: geant4-09-02-cand-01 $
//
//
// --------------------------------------------------------------------
// GEANT 4 class header file
//
// G4Sphere
//
// Class description:
//
//   A G4Sphere is, in the general case, section of a spherical shell,
//   between specified phi and theta angles
//
//   The phi and theta segments are described by a starting angle,
//   and the +ve delta angle for the shape.
//   If the delta angle is >=2*pi, or >=pi the shape is treated as
//   continuous in phi or theta respectively.
//
//   Theta must lie between 0-pi (incl).
//
//   Member Data:
//
//   fRmin  inner radius
//   fRmax  outer radius
//
//   fSPhi  starting angle of the segment in radians
//   fDPhi  delta angle of the segment in radians
//
//   fSTheta  starting angle of the segment in radians
//   fDTheta  delta angle of the segment in radians
//
//     
//   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:
// 28.3.94 P.Kent: old C++ code converted to tolerant geometry
// 17.9.96 V.Grichine: final modifications to commit
// --------------------------------------------------------------------

#ifndef G4Sphere_HH
#define G4Sphere_HH

#include "G4CSGSolid.hh"

class G4VisExtent;

class G4Sphere : public G4CSGSolid
{
  public:  // with description

    G4Sphere(const G4String& pName,
                   G4double pRmin, G4double pRmax,
                   G4double pSPhi, G4double pDPhi,
                   G4double pSTheta, G4double pDTheta);
       
    virtual ~G4Sphere() ;
    
    // Accessors
       
    inline G4double GetInnerRadius    () const;
    inline G4double GetOuterRadius    () const;
    inline G4double GetStartPhiAngle  () const;
    inline G4double GetDeltaPhiAngle  () const;
    inline G4double GetStartThetaAngle() const;
    inline G4double GetDeltaThetaAngle() const;

    // Modifiers

    inline void SetInnerRadius    (G4double newRMin);
    inline void SetOuterRadius    (G4double newRmax);
    inline void SetStartPhiAngle  (G4double newSphi);
    inline void SetDeltaPhiAngle  (G4double newDphi);
    inline void SetStartThetaAngle(G4double newSTheta);
    inline void SetDeltaThetaAngle(G4double newDTheta);

    // 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
    G4VisExtent   GetExtent          () const;    
    void          DescribeYourselfTo(G4VGraphicsScene& scene) const;
    G4Polyhedron* CreatePolyhedron() const;
    G4NURBS*      CreateNURBS() const;
  
  public:  // without description
   
    G4Sphere(__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  GetRmin()   const;
    inline G4double  GetRmax()   const;
    inline G4double  GetSPhi()   const;
    inline G4double  GetDPhi()   const;
    inline G4double  GetSTheta() const;
    inline G4double  GetDTheta() const;
    inline G4double  GetInsideRadius() const;
    inline void SetInsideRadius(G4double newRmin);

  protected:
 
    G4ThreeVectorList*
    CreateRotatedVertices(const G4AffineTransform& pTransform,
                                G4int& noPolygonVertices) const;
  
    // Used by distanceToOut
  
    enum ESide {kNull,kRMin,kRMax,kSPhi,kEPhi,kSTheta,kETheta};
  
    // used by normal
  
    enum ENorm {kNRMin,kNRMax,kNSPhi,kNEPhi,kNSTheta,kNETheta};

  private:

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

  private:

    G4double kAngTolerance, kRadTolerance;

    G4double fRmin,fRmax,
             fSPhi,fDPhi,
             fSTheta,fDTheta;
    G4double fEpsilon;
};

#include "G4Sphere.icc"

#endif
