TrkLineTraj.cxx

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// ----------------------------------------------------------------------------
// File and Version Information:
//      $Id: TrkLineTraj.cxx,v 1.3 2006/03/28 01:02:36 zhangy Exp $
//
//  Description:
//  Single line segment trajectory class
//
// Copyright Information:
//  Copyright (C) 1996  Lawrence Berkeley Laboratory
//
//  Authors: Dave Brown, 11/15/96
//-----------------------------------------------------------------------------
#include "TrkBase/TrkLineTraj.h"
#include "CLHEP/Matrix/Matrix.h"
#include "MdcGeom/TrkGeomTrajVisitor.h"
 
TrkLineTraj::TrkLineTraj( const HepPoint3D& point, const Hep3Vector& direction, double length )
    : TrkGeomTraj( 0.0, length ), _start( point ), _direction( direction ) {
  _direction.setMag( 1.0 );
}
 
TrkLineTraj::TrkLineTraj( const HepPoint3D& point, const Hep3Vector& direction, double lorange,
                          double hirange )
    : TrkGeomTraj( lorange, hirange ), _start( point ), _direction( direction ) {
  _direction.setMag( 1.0 );
}
 
TrkLineTraj::TrkLineTraj( const HepPoint3D& point1, const HepPoint3D& point2 )
    : TrkGeomTraj( 0.0, point1.distance2( point2 ) ), _start( point1 ) {
  //_direction = point2 - point1;
  _direction = ( (CLHEP::Hep3Vector)point2 ) - ( (CLHEP::Hep3Vector)point1 );
  _direction.setMag( 1.0 );
}
 
TrkLineTraj::TrkLineTraj( const TrkLineTraj& other )
    : TrkGeomTraj( other.lowRange(), other.hiRange() )
    , _start( other._start )
    , _direction( other._direction ) {}
 
TrkLineTraj::~TrkLineTraj() {}
 
TrkLineTraj& TrkLineTraj::operator=( const TrkLineTraj& other ) {
  if ( &other != this )
  {
    Trajectory::operator=( other );
    _start     = other._start;
    _direction = other._direction;
  }
  return *this;
}
 
TrkLineTraj* TrkLineTraj::clone() const { return new TrkLineTraj( *this ); }
 
HepPoint3D TrkLineTraj::position( double flightlen ) const {
  return _start + _direction * flightlen;
}
 
Hep3Vector TrkLineTraj::direction( double ) const { return _direction; }
 
Hep3Vector TrkLineTraj::delDirect( double ) const { return Hep3Vector( 0., 0., 0. ); }
 
double TrkLineTraj::distTo1stError( double, double, int ) const { return 999.e4; }
 
double TrkLineTraj::distTo2ndError( double, double, int ) const { return 999.e4; }
 
double TrkLineTraj::curvature( double ) const { return 0.0; }
 
void TrkLineTraj::getInfo( double fltLen, HepPoint3D& pos, Hep3Vector& dir ) const {
  pos = position( fltLen );
  dir = direction( fltLen );
}
 
void TrkLineTraj::getInfo( double fltLen, HepPoint3D& pos, Hep3Vector& dir,
                           Hep3Vector& delDir ) const {
  pos    = position( fltLen );
  dir    = direction( fltLen );
  delDir = delDirect( fltLen );
}
 
void TrkLineTraj::accept( TrkGeomTrajVisitor& visitor ) const { visitor.visitLine( this ); }