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25 // 25 //
26 // G4Field << 26 //
>> 27 // $Id: G4Field.hh,v 1.10 2006/06/29 18:22:13 gunter Exp $
>> 28 // GEANT4 tag $Name: geant4-09-01-patch-01 $
>> 29 //
>> 30 //
>> 31 // class G4Field
27 // 32 //
28 // Class description: 33 // Class description:
29 // 34 //
30 // Abstract class for any kind of Field. 35 // Abstract class for any kind of Field.
31 // It allows any kind of field (vector, scalar 36 // It allows any kind of field (vector, scalar, tensor and any set of them)
32 // to be defined by implementing the inquiry f 37 // to be defined by implementing the inquiry function interface.
33 // 38 //
34 // The key method is GetFieldValue( const do 39 // The key method is GetFieldValue( const double Point[4],
35 // ************* do 40 // ************* double *fieldArr )
36 // Given an input position/time vector 'Point' 41 // Given an input position/time vector 'Point',
37 // this method must return the value of the fi 42 // this method must return the value of the field in "fieldArr".
38 // 43 //
39 // A field must also specify whether it change 44 // A field must also specify whether it changes a track's energy:
40 // DoesFieldChangeEnergy() 45 // DoesFieldChangeEnergy()
41 // ********************* 46 // *********************
42 // A field must co-work with a corresponding E 47 // A field must co-work with a corresponding Equation of Motion, to
43 // enable the integration of a particle's posi 48 // enable the integration of a particle's position, momentum and, optionally,
44 // spin. For this a field and its equation of 49 // spin. For this a field and its equation of motion must follow the
45 // same convention for the order of field comp 50 // same convention for the order of field components in the array "fieldArr"
46 <<
47 // Created: John Apostolakis, 10.03.1997 <<
48 // ------------------------------------------- 51 // -------------------------------------------------------------------
>> 52 // History:
>> 53 // - Created: John Apostolakis, 10.03.1997
>> 54 // - Modified:
>> 55 // V. Grichine 8 Nov 2001: Extended "Point" arg to [4] array to add time
>> 56 // J. Apostolakis 5 Nov 2003: Added virtual method DoesFieldChangeEnergy()
>> 57 // J. Apostolakis 31 Aug 2004: Information on convention for components
>> 58 // -------------------------------------------------------------------
>> 59
49 #ifndef G4FIELD_HH 60 #ifndef G4FIELD_HH
50 #define G4FIELD_HH 61 #define G4FIELD_HH
51 62
52 #include "G4Types.hh" 63 #include "G4Types.hh"
53 #include "globals.hh" <<
54 64
55 class G4Field 65 class G4Field
56 { 66 {
57 public: // with description 67 public: // with description
58 68
59 G4Field( G4bool gravityOn = false); << 69 virtual void GetFieldValue( const double Point[4],
60 G4Field( const G4Field& ); << 70 double *fieldArr ) const = 0;
61 virtual ~G4Field(); <<
62 G4Field& operator = (const G4Field& p); <<
63 <<
64 virtual void GetFieldValue( const G4doub <<
65 G4doub <<
66 // Given the position time vector 'Poin 71 // Given the position time vector 'Point',
67 // return the value of the field in the 72 // return the value of the field in the array fieldArr.
68 // Notes: 73 // Notes:
69 // 1) The 'Point' vector has the foll 74 // 1) The 'Point' vector has the following structure:
70 // Point[0] is x ( position, 75 // Point[0] is x ( position, in Geant4 units )
71 // Point[1] is y 76 // Point[1] is y
72 // Point[2] is z 77 // Point[2] is z
73 // Point[3] is t ( time, in 78 // Point[3] is t ( time, in Geant4 units )
74 // 2) The convention for the componen 79 // 2) The convention for the components of the field
75 // array 'fieldArr' are determined 80 // array 'fieldArr' are determined by the type of field.
76 // See for example the class G4Ele 81 // See for example the class G4ElectroMagneticField.
77 82
78 virtual G4bool DoesFieldChangeEnergy() c << 83 G4Field(){;}
79 // Each type/class of field should res << 84 virtual ~G4Field(){;}
80 // For example: << 85 inline G4Field& operator = (const G4Field &p);
81 // - an electric field should re << 86
82 // - a pure magnetic field should re << 87 // A field signature function that can be used to insure
83 << 88 // that the Equation of motion object and the G4Field object
84 inline G4bool IsGravityActive() const; << 89 // have the same "field signature"?
85 // Does this field include gravity? << 90
86 << 91 virtual G4bool DoesFieldChangeEnergy() const= 0 ;
87 inline void SetGravityActive( G4bool OnO << 92 // Each type/class of field should respond this accordingly
88 << 93 // For example:
89 virtual G4Field* Clone() const; << 94 // - an electric field should return "true"
90 // Implements cloning, needed by multi << 95 // - a pure magnetic field should return "false"
91 <<
92 static constexpr G4int MAX_NUMBER_OF_COM <<
93 <<
94 private: <<
95 96
96 G4bool fGravityActive = false; <<
97 }; 97 };
98 98
99 // Inline methods ... << 99 inline G4Field& G4Field::operator = (const G4Field &p)
100 <<
101 inline G4bool G4Field::IsGravityActive() const <<
102 { 100 {
103 return fGravityActive; << 101 if (&p != this) { *this = p; }
>> 102 return *this;
104 } 103 }
105 104
106 inline void G4Field::SetGravityActive( G4bool << 105 #endif /* G4FIELD_HH */
107 { <<
108 fGravityActive = OnOffFlag; <<
109 } <<
110 <<
111 #endif <<
112 106