TRT_DetElementsComparison.h

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/*
  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef  TRT_DetElementsComparison_h
#define  TRT_DetElementsComparison_h
 
#include "TrkParameters/TrackParameters.h"
 
 
namespace InDet{
 
  // Object function for ordering barrel pixels and silicons wafers 
  // in azimuthal angle order
 
  class compTRTDetElements_A {
 
  public:
 
    bool operator () (const InDetDD::TRT_BaseElement* e1,
              const InDetDD::TRT_BaseElement* e2) 
      {
    const Amg::Transform3D& T1 = e1->surface().transform();
    const Amg::Transform3D& T2 = e2->surface().transform();
    double f1 = atan2(T1(1,0),T1(0,0));
    double f2 = atan2(T2(1,0),T2(0,0));
    return(f1<f2);
      }
  };
 
  // Object function for ordering barrel pixels and silicons wafers 
  // in azimuthal angle and Z coordinates order
 
  class compTRTDetElements_AZ {
 
  public:
 
    bool operator () (const InDetDD::TRT_BaseElement* e1,
              const InDetDD::TRT_BaseElement* e2) 
      {
    Amg::Vector3D p1  = e1->center();
    Amg::Vector3D p2  = e2->center();
    double f1 = atan2(p1.y(),p1.x());
    double f2 = atan2(p2.y(),p2.x());
    if(fabs(f1-f2)>.04) return(f1<f2);
        return(p1.z()<p2.z());
      }
  };
}
#endif // TRT_DetElementsComparison_h