| Geant4 Cross Reference |
1 // 1 //
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25 // 25 //
26 // G4Field 26 // G4Field
27 // 27 //
28 // Class description: 28 // Class description:
29 // 29 //
30 // Abstract class for any kind of Field. 30 // Abstract class for any kind of Field.
31 // It allows any kind of field (vector, scalar 31 // It allows any kind of field (vector, scalar, tensor and any set of them)
32 // to be defined by implementing the inquiry f 32 // to be defined by implementing the inquiry function interface.
33 // 33 //
34 // The key method is GetFieldValue( const do 34 // The key method is GetFieldValue( const double Point[4],
35 // ************* do 35 // ************* double *fieldArr )
36 // Given an input position/time vector 'Point' 36 // Given an input position/time vector 'Point',
37 // this method must return the value of the fi 37 // this method must return the value of the field in "fieldArr".
38 // 38 //
39 // A field must also specify whether it change 39 // A field must also specify whether it changes a track's energy:
40 // DoesFieldChangeEnergy() 40 // DoesFieldChangeEnergy()
41 // ********************* 41 // *********************
42 // A field must co-work with a corresponding E 42 // A field must co-work with a corresponding Equation of Motion, to
43 // enable the integration of a particle's posi 43 // enable the integration of a particle's position, momentum and, optionally,
44 // spin. For this a field and its equation of 44 // spin. For this a field and its equation of motion must follow the
45 // same convention for the order of field comp 45 // same convention for the order of field components in the array "fieldArr"
46 46
47 // Created: John Apostolakis, 10.03.1997 47 // Created: John Apostolakis, 10.03.1997
48 // ------------------------------------------- 48 // -------------------------------------------------------------------
49 #ifndef G4FIELD_HH 49 #ifndef G4FIELD_HH
50 #define G4FIELD_HH 50 #define G4FIELD_HH
51 51
52 #include "G4Types.hh" 52 #include "G4Types.hh"
53 #include "globals.hh" 53 #include "globals.hh"
54 54
55 class G4Field 55 class G4Field
56 { 56 {
57 public: // with description 57 public: // with description
58 58
59 G4Field( G4bool gravityOn = false); 59 G4Field( G4bool gravityOn = false);
60 G4Field( const G4Field& ); 60 G4Field( const G4Field& );
61 virtual ~G4Field(); 61 virtual ~G4Field();
62 G4Field& operator = (const G4Field& p); 62 G4Field& operator = (const G4Field& p);
63 63
64 virtual void GetFieldValue( const G4doub 64 virtual void GetFieldValue( const G4double Point[4],
65 G4doub 65 G4double* fieldArr ) const = 0;
66 // Given the position time vector 'Poin 66 // Given the position time vector 'Point',
67 // return the value of the field in the 67 // return the value of the field in the array fieldArr.
68 // Notes: 68 // Notes:
69 // 1) The 'Point' vector has the foll 69 // 1) The 'Point' vector has the following structure:
70 // Point[0] is x ( position, 70 // Point[0] is x ( position, in Geant4 units )
71 // Point[1] is y 71 // Point[1] is y
72 // Point[2] is z 72 // Point[2] is z
73 // Point[3] is t ( time, in 73 // Point[3] is t ( time, in Geant4 units )
74 // 2) The convention for the componen 74 // 2) The convention for the components of the field
75 // array 'fieldArr' are determined 75 // array 'fieldArr' are determined by the type of field.
76 // See for example the class G4Ele 76 // See for example the class G4ElectroMagneticField.
77 77
78 virtual G4bool DoesFieldChangeEnergy() c 78 virtual G4bool DoesFieldChangeEnergy() const = 0;
79 // Each type/class of field should res 79 // Each type/class of field should respond this accordingly
80 // For example: 80 // For example:
81 // - an electric field should re 81 // - an electric field should return "true"
82 // - a pure magnetic field should re 82 // - a pure magnetic field should return "false"
83 83
84 inline G4bool IsGravityActive() const; 84 inline G4bool IsGravityActive() const;
85 // Does this field include gravity? 85 // Does this field include gravity?
86 86
87 inline void SetGravityActive( G4bool OnO 87 inline void SetGravityActive( G4bool OnOffFlag );
88 88
89 virtual G4Field* Clone() const; 89 virtual G4Field* Clone() const;
90 // Implements cloning, needed by multi 90 // Implements cloning, needed by multi-threading
91 91
92 static constexpr G4int MAX_NUMBER_OF_COM 92 static constexpr G4int MAX_NUMBER_OF_COMPONENTS = 24;
93 93
94 private: 94 private:
95 95
96 G4bool fGravityActive = false; 96 G4bool fGravityActive = false;
97 }; 97 };
98 98
99 // Inline methods ... 99 // Inline methods ...
100 100
101 inline G4bool G4Field::IsGravityActive() const 101 inline G4bool G4Field::IsGravityActive() const
102 { 102 {
103 return fGravityActive; 103 return fGravityActive;
104 } 104 }
105 105
106 inline void G4Field::SetGravityActive( G4bool 106 inline void G4Field::SetGravityActive( G4bool OnOffFlag )
107 { 107 {
108 fGravityActive = OnOffFlag; 108 fGravityActive = OnOffFlag;
109 } 109 }
110 110
111 #endif 111 #endif
112 112