/data/refman/pasoursint/CMSSW_5_3_3/src/DataFormats/GeometryCommonDetAlgo/interface/GlobalErrorBase.h

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#ifndef GlobalErrorType_H
#define GlobalErrorType_H

#include "DataFormats/GeometryCommonDetAlgo/interface/DeepCopyPointer.h"
#include "DataFormats/Math/interface/AlgebraicROOTObjects.h"
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
//
// Exceptions
//
#include "FWCore/Utilities/interface/Exception.h"

template <class T, class ErrorWeightType> 
class GlobalErrorBase
{

public:
  class NullMatrix{};

  GlobalErrorBase() {}

  GlobalErrorBase(const NullMatrix &) {}


  GlobalErrorBase(T c11, T c21, T c22, T c31, T c32, T c33) {
    theCartesianError(0,0)=c11;
    theCartesianError(1,0)=c21;
    theCartesianError(1,1)=c22;
    theCartesianError(2,0)=c31;
    theCartesianError(2,1)=c32;
    theCartesianError(2,2)=c33;
  }
  
    GlobalErrorBase(const AlgebraicSymMatrix33 & err) : 
      theCartesianError(err) { }
  
  ~GlobalErrorBase() {}

  T cxx() const {
    return theCartesianError(0,0);
  }
  
  T cyx() const {
    return theCartesianError(1,0);
  }
  
  T cyy() const {
    return theCartesianError(1,1);
  }
  
  T czx() const {
    return theCartesianError(2,0);
  }
  
  T czy() const {
    return theCartesianError(2,1);
  }
  
  T czz() const {
    return theCartesianError(2,2);
  }
  
  const AlgebraicSymMatrix33 & matrix() const {
    return theCartesianError;
  }
  const AlgebraicSymMatrix33 & matrix_new() const {
    return theCartesianError;
  }


  T rerr(const GlobalPoint& aPoint) const {
    T r2 = aPoint.perp2();
    T x2 = aPoint.x()*aPoint.x();
    T y2 = aPoint.y()*aPoint.y();
    T xy = aPoint.x()*aPoint.y();
    if(r2 != 0) 
      return std::max<T>(0, (1./r2)*(x2*cxx() + 2.*xy*cyx() + y2*cyy()));
    else 
      return 0.5*(cxx() + cyy());  
  }

  T phierr(const GlobalPoint& aPoint) const {
    T r2 = aPoint.perp2();
    T x2 = aPoint.x()*aPoint.x();
    T y2 = aPoint.y()*aPoint.y();
    T xy = aPoint.x()*aPoint.y();
    if (r2 != 0) 
      return std::max<T>(0, (1./(r2*r2))*(y2*cxx() - 2.*xy*cyx() + x2*cyy()));
    else
      return 0;
  }

  GlobalErrorBase operator+ (const GlobalErrorBase& err) const {
    return GlobalErrorBase(theCartesianError + err.theCartesianError);
  }
  GlobalErrorBase operator- (const GlobalErrorBase& err) const {
    return GlobalErrorBase(theCartesianError - err.theCartesianError);
  }
 
private:

  AlgebraicSymMatrix33 theCartesianError;

};

#endif