JTransformation3D.hh

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#ifndef __JTRANSFORMATION3D__
#define __JTRANSFORMATION3D__

#include "JGeometry3D/JPosition3D.hh"
#include "JGeometry3D/JDirection3D.hh"
#include "JGeometry3D/JRotation3D.hh"


/**
 * \author mdejong
 */

namespace JGEOMETRY3D {}
namespace JPP { using namespace JGEOMETRY3D; }

namespace JGEOMETRY3D {

  /**
   * Transformation.
   *
   * This class defines the transformation of the coordinate system such that 
   * the z-axis is along the given direction with the origin at the given position.
   */
  struct JTransformation3D :
    public JPosition3D,
    public JRotation3D
  {
    /**
     * Constructor.
     *
     * \param  pos          position
     * \param  dir          direction
     */
    JTransformation3D(const JPosition3D&  pos,
                      const JDirection3D& dir) :
      JPosition3D(pos),
      JRotation3D(dir)
    {
      this->getPosition().rotate(this->getRotation());
    }


    /**
     * Transform position.
     *
     * \param  pos          position
     * \return              position
     */
    JPosition3D transform(const JPosition3D& pos) const
    {
      JPosition3D abc(pos);
      
      abc.transform(this->getRotation(), this->getPosition());
      
      return abc;
    }


    /**
     * Transform back position.
     *
     * \param  pos          position
     * \return              position
     */
    JPosition3D transform_back(const JPosition3D& pos) const
    {
      JPosition3D abc(pos);
      
      abc.transform_back(this->getRotation(), this->getPosition());
      
      return abc;
    }
  };
}

#endif