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// $Id$
//
//
// --------------------------------------------------------------------
//      GEANT 4 class header file 
// --------------------------------------------------------------------
//
// Class Description:
//
// G4ErrorTarget class: limits step when track reaches a plane surface.

// History:
// - Created. P. Arce, September 2004
// --------------------------------------------------------------------

#ifndef G4ErrorPlaneSurfaceTarget_hh
#define G4ErrorPlaneSurfaceTarget_hh

#include "globals.hh"
#include "G4ErrorSurfaceTarget.hh"
#include "G4ThreeVector.hh"
#include "G4Plane3D.hh"

class G4ErrorPlaneSurfaceTarget : public G4ErrorSurfaceTarget, G4Plane3D
{
  public:  // with description

    G4ErrorPlaneSurfaceTarget(G4double a=0, G4double b=0,
                              G4double c=0, G4double d=0);
      // Constructs plane by parameters: ax+by+cz+d = 0

    G4ErrorPlaneSurfaceTarget(const G4Normal3D &n,
                              const G4Point3D &p);
      // Constructs plane by point and normal

    G4ErrorPlaneSurfaceTarget(const G4Point3D &p1,
                              const G4Point3D &p2,
                              const G4Point3D &p3);
      // Constructs plane by three points

    ~G4ErrorPlaneSurfaceTarget();

    virtual G4ThreeVector Intersect( const G4ThreeVector& point,
                                     const G4ThreeVector& direc ) const;
      // Intersects the surface with the line given by point and direction
  
    virtual G4double GetDistanceFromPoint( const G4ThreeVector& point,
                                           const G4ThreeVector& direc ) const;
      // Distance from point to surface in a given direction

    virtual G4double GetDistanceFromPoint( const G4ThreeVector& pt ) const;
      // Closest distance from point to surface

    virtual G4Plane3D GetTangentPlane( const G4ThreeVector& point ) const;
      // Get tangent plane as itself

    virtual void Dump( const G4String& msg ) const;
      // Dump plane surface parameter

};

#endif