//
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//
//
// $Id$
//
// ----------------------------------------------------------------------
// Class G4BREPSolidSphere
//
// Class description:
// 
//  Definition of a generic BREP sphere:
//
//  G4BREPSolidSphere(const G4String& name,
//                    const G4Vector3D& origin,
//                    const G4Vector3D& xhat, 
//                    const G4Vector3D& zhat,
//                          G4double radius)

// Authors: J.Sulkimo, P.Urban.
// Revisions by: L.Broglia, G.Cosmo.
// ----------------------------------------------------------------------
#ifndef __G4BREPSolidSphere
#define __G4BREPSolidSphere

#include "G4BREPSolid.hh"

class G4BREPSolidSphere : public G4BREPSolid
{

 public:  // with description

  G4BREPSolidSphere(const G4String& name,
		    const G4Vector3D& origin,
		    const G4Vector3D& xhat, 
		    const G4Vector3D& zhat,
		    G4double radius);
    // Constructor defining the sphere through its spherical surfaces.

  ~G4BREPSolidSphere();
    // Empty destructor.

  EInside Inside(register const G4ThreeVector& Pt) const;
    // Determines if the point Pt is inside, outside or on the surface
    // of the solid.

  G4ThreeVector SurfaceNormal(const G4ThreeVector&) const;
    // Calculates the normal of the surface at a point on the surface
    // The sense of the normal depends on the sense of the surface.

  G4double DistanceToIn(const G4ThreeVector&) const;
    // Calculates the shortest distance ("safety") from a point
    // outside the solid to any boundary of this solid.
    // Return 0 if the point is already inside.

  G4double DistanceToIn(register const G4ThreeVector& Pt, 
			register const G4ThreeVector& V) const;
    // Calculates the distance from a point Pt outside the solid
    // to the solid's boundary along a specified direction vector V.
    // Note: Intersections with boundaries less than the tolerance must
    //       be ignored if the direction is away from the boundary.

  G4double DistanceToOut(register const G4ThreeVector& Pt, 
			 register const G4ThreeVector& V, 
			 const G4bool calcNorm=false, 
			 G4bool *validNorm=0, G4ThreeVector *n=0) const;
    // Calculates the distance from a point inside the solid to the solid`s
    // boundary along a specified direction vector.
    // Return 0 if the point is already outside.
    // Note: If the shortest distance to a boundary is less than the
    //       tolerance, it is ignored. This allows for a point within a
    //       tolerant boundary to leave immediately.

  G4double DistanceToOut(const G4ThreeVector&) const;
    // Calculates the shortest distance ("safety") from a point inside the
    // solid to any boundary of this solid.
    // Return 0 if the point is already outside.	

  G4VSolid* Clone() const;
    // Returns a pointer of a dynamically allocated copy of the solid.

  std::ostream& StreamInfo(std::ostream& os) const;
    // Streams solid contents to output stream.

 public:  // without description

  G4BREPSolidSphere(__void__&);
    // Fake default constructor for usage restricted to direct object
    // persistency for clients requiring preallocation of memory for
    // persistifiable objects.

  inline void SphReset() { active=1; }

  G4BREPSolidSphere(const G4BREPSolidSphere& rhs);
  G4BREPSolidSphere& operator=(const G4BREPSolidSphere& rhs);
    // Copy constructor and assignment operator.

 private:

  void InitializeSphere();

 private:

  struct G4BREPSphereParams
  {
    G4Vector3D origin;
    G4Vector3D xhat;
    G4Vector3D zhat;
    G4double   radius;
  } constructorParams;
};

#endif