DCoordinateSystem.h

Go to the documentation of this file.

// $Id$
//
//    File: DCoordinateSystem.h
// Created: Thu Nov 16 10:15:12 EST 2006
// Creator: davidl (on Darwin swire-b241.jlab.org 8.8.0 powerpc)
//

#ifndef _DCoordinateSystem_
#define _DCoordinateSystem_

#include <DVector3.h>

class DCoordinateSystem{
   public:
      DCoordinateSystem(){}
      virtual ~DCoordinateSystem(){}
      
      DVector3 origin;  //< x,y,z-coordinate of origin in lab coordinates
      DVector3 sdir;    //< direction of s-axis in lab coordinates
      DVector3 tdir;    //< direction of t-axis in lab coordinates
      DVector3 udir;    //< direction of u-axis in lab coordinates
      double L;         //< length of wire (if this represents a wire)
      
      inline void ToLab(double &x, double &y, double &z);
      inline void FromLab(double &x, double &y, double &z);
      inline void ToLab(DVector3 &pos);
      inline void FromLab(DVector3 &pos);
};

//---------------------------------
// ToLab
//---------------------------------
inline void DCoordinateSystem::ToLab(double &x, double &y, double &z)
{
   /// Transform the given vector from this coordinate
   /// system into the lab coordinate system.
   DVector3 pos(x,y,z);
   ToLab(pos);
   x= pos.x();
   y= pos.y();
   z= pos.z();
}

//---------------------------------
// FromLab
//---------------------------------
inline void DCoordinateSystem::FromLab(double &x, double &y, double &z)
{
   /// Transform the given vector from the lab coordinate
   /// system into this coordinate system.
   DVector3 pos(x,y,z);
   FromLab(pos);
   x= pos.x();
   y= pos.y();
   z= pos.z();
}

//---------------------------------
// ToLab
//---------------------------------
inline void DCoordinateSystem::ToLab(DVector3 &pos)
{
   /// Transform the given vector from this coordinate
   /// system into the lab coordinate system.
   pos = origin + pos.x()*sdir + pos.y()*tdir + pos.z()*udir;
}

//---------------------------------
// FromLab
//---------------------------------
inline void DCoordinateSystem::FromLab(DVector3 &pos)
{
   /// Transform the given vector from the lab coordinate
   /// system into this coordinate system.
   pos -= origin;
   pos.SetXYZ(pos.Dot(sdir), pos.Dot(tdir), pos.Dot(udir));
}


#endif // _DCoordinateSystem_