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//
// $Id: G4IntersectingCone.hh,v 1.5 2002/10/28 11:47:50 gcosmo Exp $
// GEANT4 tag $Name: geant4-05-00 $
//
// 
// --------------------------------------------------------------------
// GEANT 4 class header file
//
//
// G4IntersectingCone
//
// Class description:
//
//   Utility class which calculates the intersection
//   of an arbitrary line with a fixed cone

// Author: 
//   David C. Williams (davidw@scipp.ucsc.edu)
// --------------------------------------------------------------------

#ifndef G4IntersectingCone_hh
#define G4IntersectingCone_hh

#include "globals.hh"
#include "geomdefs.hh"
#include "G4ThreeVector.hh"

class G4IntersectingCone
{
  public:

  G4IntersectingCone( const G4double r[2], const G4double z[2] );
  virtual ~G4IntersectingCone();
  
  G4int LineHitsCone( const G4ThreeVector &p, const G4ThreeVector &v,
                            G4double *s1, G4double *s2 );
  
  G4bool HitOn( const G4double r, const G4double z );
  
  inline G4double RLo() const { return rLo; }
  inline G4double RHi() const { return rHi; }
  inline G4double ZLo() const { return zLo; }
  inline G4double ZHi() const { return zHi; }
  
  
  protected:

  G4double zLo, zHi,  // Z bounds of side
           rLo, rHi;  // R bounds of side

  G4bool   type1;    // True if cone is type 1 (abs(z1-z2)>abs(r1-r2))
  G4double A, B;     // Cone radius parameter:
                     //  type 1: r = A + B*z
                     //  type 2: z = A + B*r

  G4int LineHitsCone1( const G4ThreeVector &p, const G4ThreeVector &v,
                             G4double *s1, G4double *s2 );
  G4int LineHitsCone2( const G4ThreeVector &p, const G4ThreeVector &v,
                             G4double *s1, G4double *s2 );
};

#endif