Reconstruction/MdcPatRec/MdcGeom/include/MdcGeom/EntranceAngle.h

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#ifndef ENTRANCEANGLE_H
#define ENTRANCEANGLE_H
////////////////////////////////
//
// BESIII MDC entrance angles are in radians, and degress should inly be used
// when absolutely necessary. Automatic conversions to and from
// the radians form are provided, but you have to manually
// go to and from degrees
//
// By convention, angles are represented as [-pi/2, pi/2]
//
#include "MdcGeom/Constants.h"
#include <math.h>
 
class EntranceAngle {
public:
  inline EntranceAngle();
  inline EntranceAngle( const double );
  inline ~EntranceAngle();
 
  inline operator double() const { return _phi; }; // automatic conversion to double
 
  inline double rad() const;
  inline double deg() const;
  // convention : returns value in [-90, 90]
 
protected:
  double _phi;
 
  inline static double normalize( double );
};
 
//
// Methods for EntranceAngle
//
 
inline double EntranceAngle::normalize( double angle ) {
  while ( angle < -Constants::halfPi ) { angle += Constants::pi; }
  while ( angle > Constants::halfPi ) { angle -= Constants::pi; }
  return angle;
}
 
inline EntranceAngle::EntranceAngle() : _phi( 0 ) {}
 
inline EntranceAngle::EntranceAngle( const double phi ) : _phi( normalize( phi ) ) {}
 
inline EntranceAngle::~EntranceAngle() {}
 
inline double EntranceAngle::rad() const { return _phi; }
 
inline double EntranceAngle::deg() const { return _phi * Constants::radToDegrees; }
 
#endif