VXDClusterParameters.h

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#ifndef VXDClusterParameters_h
#define VXDClusterParameters_h 1

#include "lcio.h"
#include "LCRTRelations.h"
#include "gear/GEAR.h"

/**
\addtogroup TrackDigi TrackDigi
@{


/** ======= VXDClusterParameters ========== <br>
 * Holds cluster parameters for a VXD hit - to be attached at runtime to the SimTrackerHit.
 * Cluster is defined by two  (principal component) axis and the corresponding extensions (eigenvalues).
 * 
 * @version $Id$
 * @author F.Gaede, DESY
 */

class VXDClusterParameters { 
  
public:
  
  /** The standard constructor: takes the position of the hit in ladder coordinates 
   *  and the cluster axes in  ladder coordinates. Also store the layerId and ladderId for saving cpu
   *  time later.
   */
  VXDClusterParameters(const gear::Vector3D& localPos, 
               const gear::Vector3D& a, const gear::Vector3D& b, 
               int lay,int lad) ; 
  
  
  gear::Vector3D getClusterPosition() {return _localPos ; }
  gear::Vector3D getClusterAxisA() {return _cluAxisA ; }
  gear::Vector3D getClusterAxisB() {return _cluAxisB ; }
  
  int getLayerId() { return _layerId ; }
  int getLadderId() { return _ladderId ; }
  


  /** True, if the 2D projection to the ladder surface of the given position is within the ellipse
   *  defined by the two cluster axes.
   */
  bool isPointInClusterEllipse(const gear::Vector3D& pos) ;
  
protected:

  VXDClusterParameters() : 
    _localPos(0,0,0),
    _cluAxisA(0,0,0),
    _cluAxisB(0,0,0),
    _layerId (-1) ,
    _ladderId(-1) {
  }

  gear::Vector3D _localPos{}; // position of hit on ladder
  gear::Vector3D _cluAxisA{};
  gear::Vector3D _cluAxisB{};
  int _layerId{};
  int _ladderId{};
} ;




/** Allows to use VXDClusterParameters as runtime extension object.
 */
struct ClusterParams: public lcio::LCOwnedExtension< ClusterParams, VXDClusterParameters >  {};
/** @} */
#endif