//
// ********************************************************************
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//
// $Id: G4EnclosingCylinder.hh,v 1.6 2003/11/03 18:39:54 gcosmo Exp $
// GEANT4 tag $Name: geant4-07-00-cand-01 $
//
//
// --------------------------------------------------------------------
// GEANT 4 class header file
//
// G4EnclosingCylinder
//
// Class description:
//
//   Definition of a utility class for quickly deciding if a point
//   is clearly outside a polyhedra or polycone or deciding if
//   a trajectory is clearly going to miss those shapes.

// Author: 
//   David C. Williams (davidw@scipp.ucsc.edu)
// --------------------------------------------------------------------
#ifndef G4EnclosingCylinder_hh
#define G4EnclosingCylinder_hh

#include "G4Types.hh"
#include "geomdefs.hh"
#include "G4ThreeVector.hh"

class G4ReduciblePolygon;

class G4EnclosingCylinder
{
  public:  // with description

  G4EnclosingCylinder( const G4ReduciblePolygon *rz,
                             G4bool phiIsOpen, 
                             G4double startPhi, G4double totalPhi );
  ~G4EnclosingCylinder();
  
  G4bool MustBeOutside( const G4ThreeVector &p ) const;
    // Decide very rapidly if the point is outside the cylinder.
    // If one is not certain, return false.

  G4bool ShouldMiss( const G4ThreeVector &p, const G4ThreeVector &v ) const;
    // Decide very rapidly if the trajectory is going to miss the cylinder.
    // If one is not sure, return false.

  protected:

  G4double radius;    // radius of our cylinder
  G4double zLo, zHi;  // z extent
  
  G4bool    phiIsOpen; // true if there is a phi segment
  G4double  startPhi,  // for isPhiOpen==true, starting of phi segment
            totalPhi;  // for isPhiOpen==true, size of phi segment

  G4double rx1, ry1,
           dx1, dy1;
  G4double rx2, ry2,
           dx2, dy2;
     
  G4bool   concave;  // true, if x/y cross section is concave
    
};

#endif