/usr/include/root/TVector2.h is in libroot-math-physics-dev 5.34.14-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Author: Pasha Murat 12/02/99
/*************************************************************************
* Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
* All rights reserved. *
* *
* For the licensing terms see $ROOTSYS/LICENSE. *
* For the list of contributors see $ROOTSYS/README/CREDITS. *
*************************************************************************/
#ifndef ROOT_TVector2
#define ROOT_TVector2
#include "TObject.h"
class TVector2 : public TObject {
//------------------------------------------------------------------------------
// data members
//------------------------------------------------------------------------------
protected:
Double_t fX; // components of the vector
Double_t fY;
//------------------------------------------------------------------------------
// function members
//------------------------------------------------------------------------------
public:
TVector2 ();
TVector2 (Double_t *s);
TVector2 (Double_t x0, Double_t y0);
virtual ~TVector2();
// ****** unary operators
TVector2& operator = (TVector2 const & v);
TVector2& operator += (TVector2 const & v);
TVector2& operator -= (TVector2 const & v);
Double_t operator *= (TVector2 const & v);
TVector2& operator *= (Double_t s);
TVector2& operator /= (Double_t s);
// ****** binary operators
friend TVector2 operator + (const TVector2&, const TVector2&);
friend TVector2 operator + (const TVector2&, Double_t );
friend TVector2 operator + (Double_t , const TVector2&);
friend TVector2 operator - (const TVector2&, const TVector2&);
friend TVector2 operator - (const TVector2&, Double_t );
friend Double_t operator * (const TVector2&, const TVector2&);
friend TVector2 operator * (const TVector2&, Double_t );
friend TVector2 operator * (Double_t , const TVector2&);
friend TVector2 operator / (const TVector2&, Double_t );
friend Double_t operator ^ (const TVector2&, const TVector2&);
// ****** setters
void Set(const TVector2& v);
void Set(Double_t x0, Double_t y0);
void Set(float x0, float y0);
// ****** other member functions
Double_t Mod2() const { return fX*fX+fY*fY; };
Double_t Mod () const;
Double_t Px() const { return fX; };
Double_t Py() const { return fY; };
Double_t X () const { return fX; };
Double_t Y () const { return fY; };
// phi() is defined in [0,TWOPI]
Double_t Phi () const;
Double_t DeltaPhi(const TVector2& v) const;
void SetMagPhi(Double_t mag, Double_t phi);
// unit vector in the direction of *this
TVector2 Unit() const;
TVector2 Ort () const;
// projection of *this to the direction
// of TVector2 vector `v'
TVector2 Proj(const TVector2& v) const;
// component of *this normal to `v'
TVector2 Norm(const TVector2& v) const;
// rotates 2-vector by phi radians
TVector2 Rotate (Double_t phi) const;
// returns phi angle in the interval [0,2*PI)
static Double_t Phi_0_2pi(Double_t x); // returns phi angle in the interval
// returns phi angle in the interval [-PI,PI)
static Double_t Phi_mpi_pi(Double_t x);
void Print(Option_t* option="") const;
ClassDef(TVector2,3) // A 2D physics vector
};
// ****** unary operators
inline TVector2& TVector2::operator = (TVector2 const& v) {fX = v.fX; fY = v.fY; return *this;}
inline TVector2& TVector2::operator += (TVector2 const& v) {fX += v.fX; fY += v.fY; return *this;}
inline TVector2& TVector2::operator -= (TVector2 const& v) {fX -= v.fX; fY -= v.fY; return *this;}
// scalar product of 2 2-vectors
inline Double_t TVector2::operator *= (const TVector2& v) { return(fX*v.fX+fY*v.fY); }
inline TVector2& TVector2::operator *= (Double_t s) { fX *=s; fY *=s; return *this; }
inline TVector2& TVector2::operator /= (Double_t s) { fX /=s; fY /=s; return *this; }
// ****** binary operators
inline TVector2 operator + (const TVector2& v1, const TVector2& v2) {
return TVector2(v1.fX+v2.fX,v1.fY+v2.fY);
}
inline TVector2 operator + (const TVector2& v1, Double_t bias) {
return TVector2 (v1.fX+bias,v1.fY+bias);
}
inline TVector2 operator + (Double_t bias, const TVector2& v1) {
return TVector2 (v1.fX+bias,v1.fY+bias);
}
inline TVector2 operator - (const TVector2& v1, const TVector2& v2) {
return TVector2(v1.fX-v2.fX,v1.fY-v2.fY);
}
inline TVector2 operator - (const TVector2& v1, Double_t bias) {
return TVector2 (v1.fX-bias,v1.fY-bias);
}
inline TVector2 operator * (const TVector2& v, Double_t s) {
return TVector2 (v.fX*s,v.fY*s);
}
inline TVector2 operator * (Double_t s, const TVector2& v) {
return TVector2 (v.fX*s,v.fY*s);
}
inline Double_t operator * (const TVector2& v1, const TVector2& v2) {
return v1.fX*v2.fX+v1.fY*v2.fY;
}
inline TVector2 operator / (const TVector2& v, Double_t s) {
return TVector2 (v.fX/s,v.fY/s);
}
inline Double_t operator ^ (const TVector2& v1, const TVector2& v2) {
return v1.fX*v2.fY-v1.fY*v2.fX;
}
inline Double_t TVector2::DeltaPhi(const TVector2& v) const { return Phi_mpi_pi(Phi()-v.Phi()); }
inline TVector2 TVector2::Ort () const { return Unit(); }
inline TVector2 TVector2::Proj(const TVector2& v) const { return v*(((*this)*v)/v.Mod2()); }
inline TVector2 TVector2::Norm(const TVector2& v) const {return *this-Proj(v); }
// ****** setters
inline void TVector2::Set(const TVector2& v ) { fX = v.fX; fY = v.fY; }
inline void TVector2::Set(Double_t x0, Double_t y0) { fX = x0 ; fY = y0 ; }
inline void TVector2::Set(float x0, float y0) { fX = x0 ; fY = y0 ; }
#endif
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