00001 #ifndef ENTRANCEANGLE_H 00002 #define ENTRANCEANGLE_H 00004 // 00005 // BESIII MDC entrance angles are in radians, and degress should inly be used 00006 // when absolutely necessary. Automatic conversions to and from 00007 // the radians form are provided, but you have to manually 00008 // go to and from degrees 00009 // 00010 // By convention, angles are represented as [-pi/2, pi/2] 00011 // 00012 #include "MdcGeom/Constants.h" 00013 #include <math.h> 00014 00015 00016 class EntranceAngle 00017 { 00018 public: 00019 inline EntranceAngle(); 00020 inline EntranceAngle(const double); 00021 inline ~EntranceAngle(); 00022 00023 inline operator double() const { return _phi;}; // automatic conversion to double 00024 00025 inline double rad() const; 00026 inline double deg() const; 00027 // convention : returns value in [-90, 90] 00028 00029 protected: 00030 double _phi; 00031 00032 inline static double normalize(double); 00033 00034 }; 00035 00036 // 00037 // Methods for EntranceAngle 00038 // 00039 00040 inline double EntranceAngle::normalize(double angle) { 00041 while (angle < - Constants::halfPi) { 00042 angle += Constants::pi; 00043 } 00044 while (angle > Constants::halfPi) { 00045 angle -= Constants::pi; 00046 } 00047 return angle; 00048 } 00049 00050 inline EntranceAngle::EntranceAngle() : _phi(0) 00051 { } 00052 00053 inline EntranceAngle::EntranceAngle(const double phi) : _phi(normalize(phi)) 00054 {} 00055 00056 inline EntranceAngle::~EntranceAngle() {} 00057 00058 inline double EntranceAngle::rad() const 00059 { return _phi; } 00060 00061 inline double EntranceAngle::deg() const 00062 { return _phi * Constants::radToDegrees; } 00063 00064 #endif
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