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2 | // ******************************************************************** |
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21 | // * any work based on the software) you agree to acknowledge its * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: G4ErrorFreeTrajState.hh,v 1.4 2007/05/31 20:27:06 arce Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
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29 | // |
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30 | // Class Description: |
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31 | // |
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32 | // Represents a free G4ErrorTrajState |
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33 | // It can be represented by the 5 variables |
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34 | // 1/p, lambda, phi, y_perp, z_perp |
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35 | // where lambda and phi are the dip and azimuthal angles related |
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36 | // to the momentum components in the following way: |
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37 | // p_x = p cos(lambda) cos(phi) ! lambda = 90 - theta |
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38 | // p_y = p cos(lambda) sin(phi) |
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39 | // p_z = p sin(lambda) |
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40 | // y_perp and z_perp are the coordinates of the trajectory in a |
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41 | // local orthonormal reference frame with the x_perp axis along the |
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42 | // particle direction, the y_perp being parallel to the x-y plane. |
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43 | // |
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44 | // This class also takes care of propagating the error associated to |
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45 | // the trajectory |
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46 | |
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47 | // History: |
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48 | // - Created: P. Arce |
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49 | // -------------------------------------------------------------------- |
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50 | |
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51 | #ifndef G4ErrorFreeTrajState_hh |
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52 | #define G4ErrorFreeTrajState_hh |
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53 | |
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54 | #include "globals.hh" |
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55 | |
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56 | #include "G4ErrorMatrix.hh" |
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57 | |
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58 | #include "G4ErrorTrajState.hh" |
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59 | #include "G4ErrorFreeTrajParam.hh" |
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60 | |
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61 | #include "G4Point3D.hh" |
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62 | #include "G4Vector3D.hh" |
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63 | |
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64 | class G4ErrorSurfaceTrajState; |
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65 | |
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66 | class G4ErrorFreeTrajState : public G4ErrorTrajState |
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67 | { |
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68 | public: // with description |
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69 | |
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70 | G4ErrorFreeTrajState(){} |
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71 | G4ErrorFreeTrajState( const G4String& partType, |
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72 | const G4Point3D& pos, |
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73 | const G4Vector3D& mom, |
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74 | const G4ErrorTrajErr& errmat = G4ErrorTrajErr(5,0) ); |
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75 | // Constructor by providing particle, position and momentum |
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76 | |
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77 | G4ErrorFreeTrajState( const G4ErrorSurfaceTrajState& tpOS ); |
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78 | // Constructor by providing G4ErrorSurfaceTrajState |
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79 | |
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80 | ~G4ErrorFreeTrajState(){} |
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81 | |
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82 | virtual G4int Update( const G4Track* aTrack ); |
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83 | // update parameters from G4Track |
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84 | |
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85 | virtual G4int PropagateError( const G4Track* aTrack ); |
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86 | // propagate the error along the step |
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87 | |
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88 | virtual void Dump( std::ostream& out = G4cout ) const; |
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89 | // dump TrajState parameters |
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90 | |
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91 | friend |
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92 | std::ostream& operator<<(std::ostream&, const G4ErrorFreeTrajState& ts); |
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93 | |
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94 | // Set and Get methods |
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95 | |
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96 | virtual void SetPosition( const G4Point3D pos ) |
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97 | { SetParameters( pos, fMomentum ); } |
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98 | |
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99 | virtual void SetMomentum( const G4Vector3D& mom ) |
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100 | { SetParameters( fPosition, mom ); } |
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101 | |
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102 | void SetParameters( const G4Point3D& pos, const G4Vector3D& mom ) |
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103 | { |
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104 | fPosition = pos; |
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105 | fMomentum = mom; |
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106 | fTrajParam.SetParameters( pos, mom ); |
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107 | } |
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108 | |
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109 | G4ErrorFreeTrajParam GetParameters() const |
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110 | { return fTrajParam; } |
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111 | |
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112 | private: |
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113 | |
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114 | void Init(); |
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115 | // define TrajState type and build charge |
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116 | |
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117 | G4int PropagateErrorMSC( const G4Track* aTrack ); |
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118 | // add the error associated to multiple scattering |
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119 | |
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120 | void CalculateEffectiveZandA( const G4Material* mate, double& effZ, double& effA ); |
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121 | // calculate effective Z and A (needed by PropagateErrorMSC) |
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122 | |
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123 | G4int PropagateErrorIoni( const G4Track* aTrack ); |
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124 | // add the error associated to ionization energy loss |
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125 | |
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126 | |
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127 | private: |
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128 | |
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129 | G4ErrorFreeTrajParam fTrajParam; |
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130 | |
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131 | G4ErrorMatrix theTransfMat; |
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132 | |
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133 | G4bool theFirstStep; // to count if transf mat is updated or initialized |
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134 | }; |
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135 | |
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136 | #endif |
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