// This code implementation is the intellectual property of
// the GEANT4 collaboration.
//
// By copying, distributing or modifying the Program (or any work
// based on the Program) you indicate your acceptance of this statement,
// and all its terms.
//
// $Id: G4BREPSolidSphere.cc,v 1.2 1999/12/15 14:50:00 gunter Exp $
// GEANT4 tag $Name: geant4-02-00 $
//

#include "G4BREPSolidSphere.hh"
#include "G4SphericalSurface.hh"

G4BREPSolidSphere::G4BREPSolidSphere(const G4String name,
				     const G4Vector3D& o,
				     const G4Vector3D& xhat, 
				     const G4Vector3D& zhat,
				     G4double r): G4BREPSolid(name)
{
  SurfaceVec    = new G4Surface*[1];
  G4double ph1  = 0;
  G4double ph2  = 2*M_PI;
  G4double th1  = 0;
  G4double th2  = M_PI;
  SurfaceVec[0] = new G4SphericalSurface(o, xhat, zhat, r, ph1, ph2, th1, th2);
  nb_of_surfaces = 1;
  active=1;
  Initialize();
}


EInside G4BREPSolidSphere::Inside(register const G4ThreeVector& Pt) const
{
  G4double Dist = SurfaceVec[0]->HowNear(Pt);
  if(Dist > 0+kCarTolerance) return kInside;
  if(Dist < 0-kCarTolerance) return kOutside;
  return kSurface;
}


G4ThreeVector G4BREPSolidSphere::SurfaceNormal(const G4ThreeVector& Pt) const
{
  G4Vector3D n =  SurfaceVec[0]->Normal(Pt);
  G4ThreeVector norm(n.x(), n.y(), n.z());
  return norm;
}


G4double G4BREPSolidSphere::DistanceToIn(const G4ThreeVector& Pt) const
{
  return  fabs(SurfaceVec[0]->HowNear(Pt));
}


G4double G4BREPSolidSphere::DistanceToIn(register const G4ThreeVector& Pt, 
					 register const G4ThreeVector& V) const
{
  SphReset();  
  G4Vector3D Pttmp(Pt);
  G4Vector3D Vtmp(V);   
  G4Ray      r(Pttmp, Vtmp);
  int        Result = SurfaceVec[0]->Intersect( r );

  if(Result>0)
  {
    ShortestDistance = SurfaceVec[0]->Distance();
    return sqrt(ShortestDistance);
  }
  return kInfinity; 
}


G4double G4BREPSolidSphere::DistanceToOut(register const G4ThreeVector& Pt, 
					  register const G4ThreeVector& V, 
					  const G4bool calcNorm, 
					  G4bool *validNorm, 
					  G4ThreeVector *n) const
{
  if(validNorm)
    *validNorm = false;
  SphReset();  
  G4Vector3D Pttmp(Pt);
  G4Vector3D Vtmp(V);   
  G4Ray      r(Pttmp, Vtmp);

  if(SurfaceVec[0]->Intersect( r ))
  {
    if(calcNorm)
    {
      *validNorm = true;
      *n = SurfaceNormal(Pt);
    }

    ShortestDistance = SurfaceVec[0]->Distance();
    return sqrt(ShortestDistance);
  }
  return kInfinity; 
}


G4double G4BREPSolidSphere::DistanceToOut(const G4ThreeVector& Pt) const
{
  return  fabs(SurfaceVec[0]->HowNear(Pt));
}