//
// ********************************************************************
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//
// $Id: G4Parabola.hh,v 1.8 2001/07/11 09:59:35 gunter Exp $
// GEANT4 tag $Name: geant4-05-00 $
//
// ----------------------------------------------------------------------
// Class G4Parabola
//
// Class description:
// 
// Definition of a generic parabola.

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

#include "G4Conic.hh"

class G4Parabola : public G4Conic
{

public:  // with description

  G4Parabola();
  virtual ~G4Parabola();
    // Constructor & destructor.

  G4Parabola(const G4Parabola& right);
  G4Parabola& operator=(const G4Parabola& right);
    // Copy constructor and assignment operator.

  G4Curve* Project(const G4Transform3D& tr=
                   G4Transform3D::Identity);
    // Transforms and projects the curve.

  G4bool Tangent(G4CurvePoint& cp, G4Vector3D& v);
    // Returns tangent to curve at a given point, if existing.
    // The tangent is computed from the 3D point representation.

  inline G4double  GetPMax() const;
  inline G4Point3D GetPoint(G4double param) const;
  inline G4double  GetPPoint(const G4Point3D& p) const;
    // Accessors methods.

  inline G4double GetFocalDist() const;
  inline void Init(const G4Axis2Placement3D& position0, G4double focalDist0);
    // Get/Set for the geometric data.

public:  // without description

  inline G4int IntersectRay2D(const G4Ray& ray);

  // void IntersectRay2D(const G4Ray& ray, G4CurveRayIntersection& is);
  // G4Parabola(G4Point3d, G4Point3d, G4double );
  // G4Point3d EvaluateByParameterValue(G4double u);
  // G4Point3d GetBoundMax();
  // G4Point3d GetBoundMin();   

protected:

  void InitBounded();

private:

  // geometric data

  G4double focalDist;

  // for the intersection
  G4Point3D F;
  G4Point3D L0;

};

#include "G4Parabola.icc"

#endif