Reconstruction/MdcPatRec/TrkBase/include/TrkBase/TrkLineTraj.h

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// ----------------------------------------------------------------------------
// File and Version Information:
//      $Id: TrkLineTraj.h,v 1.2 2005/07/18 02:56:07 zhangy Exp $
//
//  Description:
//  Single line segment trajectory class
//
// Copyright Information:
//  Copyright (C) 1996  Lawrence Berkeley Laboratory
//
//  Authors: Dave Brown, 11/15/96
//-----------------------------------------------------------------------------
#ifndef TrkLineTraj_H
#define TrkLineTraj_H
#include "CLHEP/Geometry/Point3D.h"
#include "CLHEP/Vector/ThreeVector.h"
#include "MdcGeom/TrkGeomTraj.h"
 
class TrkLineTraj : public TrkGeomTraj {
public:
  //
  //  construct from a point, direction and length, or 2 points
  //
  TrkLineTraj( const HepPoint3D& point, const Hep3Vector& direction, double length );
  TrkLineTraj( const HepPoint3D& point, const Hep3Vector& direction, double lorange,
               double hirange );
  TrkLineTraj( const HepPoint3D& point1, const HepPoint3D& point2 );
  TrkLineTraj( const TrkLineTraj& ); // copy ctor
                                     //
  TrkLineTraj* clone() const;
 
  // destructor
  ~TrkLineTraj();
 
  // operators
  TrkLineTraj& operator=( const TrkLineTraj& );
 
  // needed implementations for intersection with a Surface
  HepPoint3D position( double ) const;
  Hep3Vector direction( double ) const;
  double     curvature( double f = 0. ) const;
  Hep3Vector delDirect( double ) const;
  void       getInfo( double fltLen, HepPoint3D&, Hep3Vector& direction ) const;
  void       getInfo( double fltLen, HepPoint3D&, Hep3Vector& direction,
                      Hep3Vector& delDirect ) const;
 
  virtual double distTo1stError( double s, double tol, int pathDir ) const;
  virtual double distTo2ndError( double s, double tol, int pathDir ) const;
 
  // Support Visitor pattern (see TrkGeomTraj.hh)
  void accept( TrkGeomTrajVisitor& visitor ) const;
 
  // Data Members
private:
  HepPoint3D _start;     // where the trajectory starts
  Hep3Vector _direction; // direction (unit) vector
};
#endif