CircleFromThreePoints.h

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#ifndef RecoPixelVertexing_PixelTrackFitting_interface_CircleFromThreePoints_h
#define RecoPixelVertexing_PixelTrackFitting_interface_CircleFromThreePoints_h

#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/GeometryVector/interface/Basic2DVector.h"

class CircleFromThreePoints {
public:
  CircleFromThreePoints() {}

  typedef Basic2DVector<float> Vector2D;

  CircleFromThreePoints(const GlobalPoint& inner,
                        const GlobalPoint& mid,
                        const GlobalPoint& outer,
                        double precision = 1.e-7);

  float curvature() const { return theCurvature; }

  Vector2D center() const { return theCenter; }

private:
  float theCurvature;
  Vector2D theCenter;

  void init(const Vector2D& b, const Vector2D& c, const Vector2D& offset, double precision);
};

#endif  // RecoPixelVertexing_PixelTrackFitting_interface_CircleFromThreePoints_h