// TwoVector class
// Glen Cowan, RHUL Physics Dept., October 2004

#ifndef TWOVECTOR_H
#define TWOVECTOR_H

#include "Rtypes.h"

// class TwoVector : public TObject {
class TwoVector {
  public:
    TwoVector();
    TwoVector(double x, double y);
    double x() const;
    double y() const;
    double r() const;
    double cosTheta() const;
    double sinTheta() const;
    double theta() const;
    void set(double x, double y);
    void setX(double);
    void setY(double);
    void setR(double);            // keeps theta constant
    void setTheta(double);        // keeps r constant
    void rotate(double);          // also as non-member function (below)
    TwoVector operator+(const TwoVector&);
    TwoVector operator-(const TwoVector&);
  private:
    double m_x;
    double m_y;
    
    ClassDef (TwoVector,1)  //<===========================
};

// non-member operators and functions

TwoVector operator*(const TwoVector&, double);    // mult. by constant
TwoVector operator*(double, const TwoVector&);    // allow either order

double    dot(const TwoVector&, const TwoVector&);
TwoVector rotate (const TwoVector&, double);

ClassImp(TwoVector)  //<======================

#endif