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// Hep-LIKE geometrical 3D LINE class
//
//
// Author: BKH
//

#ifndef HepLine3D_hh
#define HepLine3D_hh

#include "CLHEP/Geometry/Point3D.h"
#include "CLHEP/Geometry/Normal3D.h"
#include "CLHEP/Geometry/Plane3D.h"
#include <iostream>







class HepLine3D 
{
   protected:
      HepGeom::Point3D<double>   pp ;
      HepGeom::Vector3D<double>  uu ;
      double   eps ;

   public:

      HepLine3D( const HepGeom::Point3D<double> &  p, 
                 const HepGeom::Vector3D<double> & v,
                 double          sml = 1.e-10 ) :
         pp  ( p ), 
         uu  ( v*( v.mag()>1.e-10 ? 1./v.mag() : 1 ) ), 
         eps ( fabs( sml ) ) {} 

      HepLine3D( const HepGeom::Point3D<double> & p1, 
                 const HepGeom::Point3D<double> & p2, 
                 double         sml = 1.e-10 ) :
         pp  ( p1 ), 
         uu  ( (p2-p1)*( (p2-p1).mag()>1.e-10 ? 1./(p2-p1).mag() : 1 ) ),
         eps ( fabs( sml ) ) {} 

      // Copy constructor
      HepLine3D( const HepLine3D& line ) :
         pp (line.pp), uu(line.uu), eps(line.eps) {}
      
      // Destructor
      ~HepLine3D() {};
      
      // Assignment
      HepLine3D& operator=(const HepLine3D& line) 
      {
         pp = line.pp; uu = line.uu; eps = line.eps; return *this;
      }

      // Test for equality
      bool operator == (const HepLine3D& l) const 
      {
         return pp == l.pp && uu == l.uu ;
      }

      // Test for inequality
      bool operator != (const HepLine3D& l) const 
      {
         return pp != l.pp || uu != l.uu ;
      }

      const HepGeom::Point3D<double> &  pt() const { return pp ; }

      const HepGeom::Vector3D<double> & uv() const { return uu ; }

      HepGeom::Point3D<double>  point( const HepGeom::Plane3D<double>& pl, bool& parallel ) const
      {
         const double num ( -pl.d() - pl.a()*pp.x() - pl.b()*pp.y() - pl.c()*pp.z() ) ;
         const double den (           pl.a()*uu.x() + pl.b()*uu.y() + pl.c()*uu.z() ) ;

         parallel = ( eps > fabs( num ) ) || ( eps > fabs( den ) ) ;

         return ( parallel ? pp : HepGeom::Point3D<double> ( pp + uu*(num/den) ) ) ;
      }

      HepGeom::Point3D<double>  point( const HepGeom::Point3D<double> & q ) const
      {
         return ( pp + ( ( q.x() - pp.x() )*uu.x() +
                         ( q.y() - pp.y() )*uu.y() +
                         ( q.z() - pp.z() )*uu.z() )*uu ) ; 
      }

      double dist2( const HepGeom::Point3D<double> & q ) const { return ( q - point( q ) ).mag2() ; }
      double dist( const HepGeom::Point3D<double> & q ) const { return ( q - point( q ) ).mag() ; }
};

#endif