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;
    theCartesianError(3, 0) = 0.;
    theCartesianError(3, 1) = 0.;
    theCartesianError(3, 2) = 0.;
    theCartesianError(3, 3) = 0.;
  }

  GlobalErrorBase(T c11, T c21, T c22, T c31, T c32, T c33, T c41, T c42, T c43, T c44) {
    theCartesianError(0, 0) = c11;
    theCartesianError(1, 0) = c21;
    theCartesianError(1, 1) = c22;
    theCartesianError(2, 0) = c31;
    theCartesianError(2, 1) = c32;
    theCartesianError(2, 2) = c33;
    theCartesianError(3, 0) = c41;
    theCartesianError(3, 1) = c42;
    theCartesianError(3, 2) = c43;
    theCartesianError(3, 3) = c44;
  }

  GlobalErrorBase(const AlgebraicSymMatrix33& err) {
    theCartesianError(0, 0) = err(0, 0);
    theCartesianError(1, 0) = err(1, 0);
    theCartesianError(1, 1) = err(1, 1);
    theCartesianError(2, 0) = err(2, 0);
    theCartesianError(2, 1) = err(2, 1);
    theCartesianError(2, 2) = err(2, 2);
    theCartesianError(3, 0) = 0.;
    theCartesianError(3, 1) = 0.;
    theCartesianError(3, 2) = 0.;
    theCartesianError(3, 3) = 0.;
  }

  GlobalErrorBase(const AlgebraicSymMatrix44& 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); }

  T ctx() const { return theCartesianError(3, 0); }

  T cty() const { return theCartesianError(3, 1); }

  T ctz() const { return theCartesianError(3, 2); }

  T ctt() const { return theCartesianError(3, 3); }

  const AlgebraicSymMatrix33 matrix() const {
    AlgebraicSymMatrix33 out;
    out(0, 0) = theCartesianError(0, 0);
    out(1, 0) = theCartesianError(1, 0);
    out(1, 1) = theCartesianError(1, 1);
    out(2, 0) = theCartesianError(2, 0);
    out(2, 1) = theCartesianError(2, 1);
    out(2, 2) = theCartesianError(2, 2);
    return out;
  }

  const AlgebraicSymMatrix44& matrix4D() 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:
  AlgebraicSymMatrix44 theCartesianError;
};

#endif