/usr/include/root/Math/GenVector/Polar2D.h is in libroot-math-genvector-dev 5.34.30-0ubuntu8.
This file is owned by root:root, with mode 0o644.
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// Authors: W. Brown, M. Fischler, L. Moneta 2005
/**********************************************************************
* *
* Copyright (c) 2005 , LCG ROOT MathLib Team and *
* FNAL LCG ROOT MathLib Team *
* *
* *
**********************************************************************/
// Header file for class Polar2D
//
// Created by: Lorenzo Moneta at Mon May 30 11:40:03 2005
// Major revamp: M. Fischler at Wed Jun 8 2005
//
// Last update: $Id$
//
#ifndef ROOT_Math_GenVector_Polar2D
#define ROOT_Math_GenVector_Polar2D 1
#ifndef ROOT_Math_Math
#include "Math/Math.h"
#endif
#ifndef ROOT_Math_GenVector_etaMax
#include "Math/GenVector/etaMax.h"
#endif
namespace ROOT {
namespace Math {
//__________________________________________________________________________________________
/**
Class describing a polar 2D coordinate system based on r and phi
Phi is restricted to be in the range [-PI,PI)
@ingroup GenVector
*/
template <class T>
class Polar2D {
public :
typedef T Scalar;
/**
Default constructor with r=1,phi=0
*/
Polar2D() : fR(1.), fPhi(0) { }
/**
Construct from the polar coordinates: r and phi
*/
Polar2D(T r,T phi) : fR(r), fPhi(phi) { Restrict(); }
/**
Construct from any Vector or coordinate system implementing
R() and Phi()
*/
template <class CoordSystem >
explicit Polar2D( const CoordSystem & v ) :
fR(v.R() ), fPhi(v.Phi() ) { Restrict(); }
// for g++ 3.2 and 3.4 on 32 bits found that the compiler generated copy ctor and assignment are much slower
// re-implement them ( there is no no need to have them with g++4)
/**
copy constructor
*/
Polar2D(const Polar2D & v) :
fR(v.R() ), fPhi(v.Phi() ) { }
/**
assignment operator
*/
Polar2D & operator= (const Polar2D & v) {
fR = v.R();
fPhi = v.Phi();
return *this;
}
/**
Set internal data based on 2 Scalar numbers
*/
void SetCoordinates(Scalar r, Scalar phi)
{ fR=r; fPhi=phi; Restrict(); }
/**
get internal data into 2 Scalar numbers
*/
void GetCoordinates(Scalar& r, Scalar& phi) const {r=fR; phi=fPhi;}
Scalar R() const { return fR;}
Scalar Phi() const { return fPhi; }
Scalar X() const { return fR*std::cos(fPhi);}
Scalar Y() const { return fR*std::sin(fPhi);}
Scalar Mag2() const { return fR*fR;}
// setters (only for data members)
/**
set the r coordinate value keeping phi constant
*/
void SetR(const T & r) {
fR = r;
}
/**
set the phi coordinate value keeping r constant
*/
void SetPhi(const T & phi) {
fPhi = phi;
Restrict();
}
/**
set all values using cartesian coordinates
*/
void SetXY(Scalar a, Scalar b);
private:
inline static double pi() { return M_PI; }
/**
restrict abgle hi to be between -PI and PI
*/
inline void Restrict() {
if ( fPhi <= -pi() || fPhi > pi() )
fPhi = fPhi - std::floor( fPhi/(2*pi()) +.5 ) * 2*pi();
return;
}
public:
/**
scale by a scalar quantity - for polar coordinates r changes
*/
void Scale (T a) {
if (a < 0) {
Negate();
a = -a;
}
// angles do not change when scaling by a positive quantity
fR *= a;
}
/**
negate the vector
*/
void Negate ( ) {
fPhi = ( fPhi > 0 ? fPhi - pi() : fPhi + pi() );
}
/**
rotate the vector
*/
void Rotate(T angle) {
fPhi += angle;
Restrict();
}
// assignment operators
/**
generic assignment operator from any coordinate system
*/
template <class CoordSystem >
Polar2D & operator= ( const CoordSystem & c ) {
fR = c.R();
fPhi = c.Phi();
return *this;
}
/**
Exact equality
*/
bool operator==(const Polar2D & rhs) const {
return fR == rhs.fR && fPhi == rhs.fPhi;
}
bool operator!= (const Polar2D & rhs) const {return !(operator==(rhs));}
// ============= Compatibility section ==================
// The following make this coordinate system look enough like a CLHEP
// vector that an assignment member template can work with either
T x() const { return X();}
T y() const { return Y();}
// ============= Specializations for improved speed ==================
// (none)
#if defined(__MAKECINT__) || defined(G__DICTIONARY)
// ====== Set member functions for coordinates in other systems =======
void SetX(Scalar a);
void SetY(Scalar a);
#endif
private:
T fR;
T fPhi;
};
} // end namespace Math
} // end namespace ROOT
// move implementations here to avoid circle dependencies
#ifndef ROOT_Math_GenVector_Cartesian2D
#include "Math/GenVector/Cartesian2D.h"
#endif
#if defined(__MAKECINT__) || defined(G__DICTIONARY)
#ifndef ROOT_Math_GenVector_GenVector_exception
#include "Math/GenVector/GenVector_exception.h"
#endif
#endif
namespace ROOT {
namespace Math {
template <class T>
void Polar2D<T>::SetXY(Scalar a, Scalar b) {
*this = Cartesian2D<Scalar>(a, b);
}
#if defined(__MAKECINT__) || defined(G__DICTIONARY)
// ====== Set member functions for coordinates in other systems =======
template <class T>
void Polar2D<T>::SetX(Scalar a) {
GenVector_exception e("Polar2D::SetX() is not supposed to be called");
throw e;
Cartesian2D<Scalar> v(*this); v.SetX(a); *this = Polar2D<Scalar>(v);
}
template <class T>
void Polar2D<T>::SetY(Scalar a) {
GenVector_exception e("Polar2D::SetY() is not supposed to be called");
throw e;
Cartesian2D<Scalar> v(*this); v.SetY(a); *this = Polar2D<Scalar>(v);
}
#endif
} // end namespace Math
} // end namespace ROOT
#endif /* ROOT_Math_GenVector_Polar2D */
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