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FastCircle.h

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#ifndef TR_FastCircle_H_
#define TR_FastCircle_H_
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/CLHEP/interface/AlgebraicObjects.h"
#include <vector>

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;}
  
  // 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;}
  
private:

  GlobalPoint theOuterPoint; 
  GlobalPoint theInnerPoint; 
  GlobalPoint theVertexPoint; 
  double theNorm;
  
  double theX0;
  double theY0;
  double theRho;
  
  double theN1;
  double theN2;
  double theC;
  
  bool theValid;
  
  void createCircleParameters();
  AlgebraicVector3 transform(const GlobalPoint& aPoint) const;
  
};

#endif //TR_Circle_H_

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