1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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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: G4Parabola.icc,v 1.8 2006/06/29 18:39:57 gunter Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-03 $ |
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29 | // |
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30 | // -------------------------------------------------------------------- |
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31 | // GEANT 4 inline definitions file |
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32 | // |
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33 | // G4Parabola.icc |
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34 | // |
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35 | // Implementation of inline methods of G4Parabola |
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36 | // -------------------------------------------------------------------- |
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37 | |
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38 | inline |
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39 | void G4Parabola::Init(const G4Axis2Placement3D& position0, |
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40 | G4double focalDist0) |
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41 | { |
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42 | position= position0; |
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43 | focalDist= focalDist0; |
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44 | |
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45 | // focus |
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46 | F= position.GetLocation()+focalDist*position.GetPX(); |
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47 | // line |
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48 | L0= position.GetLocation()-focalDist*position.GetPX(); |
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49 | //l= position.GetPY(); |
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50 | } |
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51 | |
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52 | inline |
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53 | G4double G4Parabola::GetFocalDist() const |
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54 | { |
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55 | return focalDist; |
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56 | } |
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57 | |
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58 | ////////////////////////////////////////////////////////////////////////////// |
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59 | |
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60 | inline |
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61 | G4double G4Parabola::GetPMax() const |
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62 | { |
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63 | return -1; |
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64 | } |
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65 | |
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66 | inline |
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67 | G4Point3D G4Parabola::GetPoint(G4double param) const |
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68 | { |
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69 | return G4Point3D( position.GetLocation() |
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70 | + focalDist* (param*param*position.GetPX() |
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71 | + 2*param*position.GetPY()) ); |
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72 | } |
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73 | |
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74 | inline |
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75 | G4double G4Parabola::GetPPoint(const G4Point3D& pt) const |
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76 | { |
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77 | G4Point3D ptLocal= position.GetToPlacementCoordinates()*pt; |
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78 | return ptLocal.y()/(2*focalDist); |
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79 | } |
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80 | |
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81 | ////////////////////////////////////////////////////////////////////////////// |
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82 | |
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83 | /* |
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84 | #include "G4CurveRayIntersection.hh" |
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85 | |
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86 | inline |
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87 | void G4Parabola::IntersectRay2D(const G4Ray& ray, |
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88 | G4CurveRayIntersection& is) |
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89 | { |
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90 | is.Init(*this, ray); |
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91 | |
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92 | const G4Point3D& S= ray.GetStart(); |
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93 | const G4Vector3D& d= ray.GetDir(); |
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94 | |
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95 | const G4Vector3D& l= position.GetPY(); |
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96 | |
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97 | // a == 1 |
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98 | G4Vector3D SMinusF= S-F; |
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99 | G4double bHalf= SMinusF*d - (d.x()*l.y()-d.y()*l.x()); |
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100 | G4double c= SMinusF.mag2() + ( (S.x()-L0.x())*l.y() - (S.y()-L0.y())*l.x() ); |
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101 | |
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102 | G4double discr= bHalf*bHalf-c; |
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103 | if (discr >= 0) { |
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104 | |
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105 | // 2 intersections (maybe 1, but this case is rare) |
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106 | G4double sqrtdiscr= std::sqrt(discr); |
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107 | // find the smallest positive i |
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108 | G4double i= -bHalf-sqrtdiscr; |
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109 | if (i<kCarTolerance) { |
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110 | i= -bHalf+sqrtdiscr; |
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111 | if (i<kCarTolerance) { |
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112 | return; |
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113 | } |
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114 | } |
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115 | G4CurveRayIntersection isTmp(*this, ray); |
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116 | isTmp.ResetDistance(i); |
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117 | is.Update(isTmp); |
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118 | |
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119 | } |
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120 | } |
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121 | */ |
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122 | |
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123 | inline |
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124 | G4int G4Parabola::IntersectRay2D(const G4Ray& ray) |
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125 | { |
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126 | // NOT VERIFIED |
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127 | |
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128 | const G4Point3D& S= ray.GetStart(); |
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129 | const G4Vector3D& d= ray.GetDir(); |
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130 | const G4Vector3D& l= position.GetPY(); |
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131 | |
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132 | // a == 1 |
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133 | G4Vector3D SMinusF= G4Vector3D( S-F ); |
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134 | G4double bHalf= SMinusF*d - (d.x()*l.y()-d.y()*l.x()); |
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135 | G4double c= SMinusF.mag2() + ( (S.x()-L0.x())*l.y() - (S.y()-L0.y())*l.x() ); |
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136 | |
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137 | G4int nbinter = 0; |
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138 | |
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139 | G4double discr= bHalf*bHalf-c; |
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140 | if (discr >= 0) |
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141 | { |
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142 | // 2 intersections (maybe 1, but this case is rare) |
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143 | G4double sqrtdiscr= std::sqrt(discr); |
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144 | |
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145 | G4double i= -bHalf-sqrtdiscr; |
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146 | if (i>kCarTolerance) |
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147 | nbinter++; |
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148 | |
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149 | i= -bHalf+sqrtdiscr; |
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150 | if (i>kCarTolerance) |
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151 | nbinter++; |
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152 | } |
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153 | |
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154 | return nbinter++; |
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155 | } |
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