JPoint4D.hh

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#ifndef __JPOINT4D__
#define __JPOINT4D__
 
#include "JGeometry3D/JVertex3D.hh"
 
 
/**
 * \author mdejong
 */
 
namespace JFIT {}
namespace JPP { using namespace JFIT; }
 
namespace JFIT {
 
  using JGEOMETRY3D::JVertex3D;
    
 
  /**
   * Data structure for vertex fit.
   */
  class JPoint4D :
    public JVertex3D
  {
  public:
    /**
     * Default constructor.
     */
    JPoint4D() :
      JVertex3D()
    {}
 
 
    /**
     * Constructor
     *
     * \param pos         position
     * \param t           time at position
     */
    JPoint4D(const JVector3D& pos,
             const double     t) :
      JVertex3D(pos, t)
    {}
 
 
    /**
     * Constructor
     *
     * \param vertex    vertex
     */
    JPoint4D(const JVertex3D& vertex) :
      JVertex3D(vertex)
    {}
 
    /**
     * Computes the 4-D distance using the reduced speed of light.
     *
     * \param point    vertex
     * \return         4-D distance
     */
    double get4Distance(JPoint4D point) const
    {
      JGEOMETRY3D::JVector3D pos = this->getPosition() - point.getPosition();
      double t = (this->getT() - point.getT()) * JPHYSICS::getSpeedOfLight()/JPHYSICS::getIndexOfRefraction();
      return sqrt(pos.getLengthSquared() + t * t);
    }
    
    typedef double JPoint4D::*parameter_type;
 
    static parameter_type pX() { return &JPoint4D::__x; }
    static parameter_type pY() { return &JPoint4D::__y; }
    static parameter_type pZ() { return &JPoint4D::__z; }
    static parameter_type pT() { return &JPoint4D::__t; }
  };
}
#endif