FastCircle.h

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#ifndef TR_FastCircle_H_
#define TR_FastCircle_H_
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/Math/interface/AlgebraicROOTObjects.h"
#include "FWCore/Utilities/interface/Visibility.h"

class FastCircle {
public:
  FastCircle(const GlobalPoint& outerHit, const GlobalPoint& middleHit, const GlobalPoint& aVertex);

  FastCircle(const GlobalPoint& outerHit, const GlobalPoint& middleHit, const GlobalPoint& aVertex, double norm);

  ~FastCircle() {}

  // all returned values have dimensions of cm
  // parameters of the circle (circle is valid)
  double x0() const { return theX0; }

  double y0() const { return theY0; }

  double rho() const { return theRho; }

  bool isValid() const { return theValid; }

  bool isLine() const { return theIsLine; }

  // parameters of the straight line
  // (if circle is invalid only these are available)
  double n1() const { return theN1; }

  double n2() const { return theN2; }

  double c() const { return theC; }

  GlobalPoint const& outerPoint() const { return theOuterPoint; }
  GlobalPoint const& innerPoint() const { return theInnerPoint; }
  GlobalPoint const& vertexPoint() const { return theVertexPoint; }

private:
  GlobalPoint theOuterPoint;
  GlobalPoint theInnerPoint;
  GlobalPoint theVertexPoint;
  double theNorm;

  double theX0;
  double theY0;
  double theRho;

  double theN1;
  double theN2;
  double theC;

  bool theValid;
  bool theIsLine;

  void createCircleParameters() dso_hidden;
};

#endif  //TR_Circle_H_