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.cc,v 1.9 2007/05/18 07:33:31 gcosmo Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
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29 | // |
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30 | // ---------------------------------------------------------------------- |
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31 | // GEANT 4 class source file |
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32 | // |
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33 | // G4Parabola.cc |
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34 | // |
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35 | // ---------------------------------------------------------------------- |
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36 | |
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37 | #include "G4Parabola.hh" |
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38 | #include "G4CurvePoint.hh" |
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39 | #include "G4GeometryTolerance.hh" |
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40 | |
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41 | G4Parabola::G4Parabola(){} |
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42 | G4Parabola::~G4Parabola(){} |
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43 | |
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44 | G4Parabola::G4Parabola(const G4Parabola& right) |
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45 | : G4Conic(), focalDist(right.focalDist), F(right.F), L0(right.L0) |
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46 | { |
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47 | pShift = right.pShift; |
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48 | position = right.position; |
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49 | bBox = right.bBox; |
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50 | start = right.start; |
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51 | end = right.end; |
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52 | pStart = right.pStart; |
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53 | pEnd = right.pEnd; |
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54 | pRange = right.pRange; |
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55 | bounded = right.bounded; |
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56 | sameSense = right.sameSense; |
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57 | } |
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58 | |
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59 | G4Parabola& G4Parabola::operator=(const G4Parabola& right) |
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60 | { |
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61 | if (&right == this) return *this; |
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62 | |
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63 | F = right.F; |
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64 | L0 = right.L0; |
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65 | focalDist = right.focalDist; |
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66 | pShift = right.pShift; |
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67 | position = right.position; |
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68 | bBox = right.bBox; |
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69 | start = right.start; |
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70 | end = right.end; |
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71 | pStart = right.pStart; |
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72 | pEnd = right.pEnd; |
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73 | pRange = right.pRange; |
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74 | bounded = right.bounded; |
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75 | sameSense = right.sameSense; |
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76 | |
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77 | return *this; |
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78 | } |
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79 | |
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80 | G4Curve* G4Parabola::Project(const G4Transform3D& tr) |
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81 | { |
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82 | G4double axisZ= (tr*position.GetPZ()).unit().z(); |
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83 | |
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84 | if (std::abs(axisZ)<G4GeometryTolerance::GetInstance()->GetAngularTolerance()) |
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85 | { return 0; } |
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86 | |
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87 | |
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88 | G4Vector3D newAxis(0, 0, axisZ>0? +1: -1); |
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89 | |
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90 | G4Vector3D xPrime= tr*position.GetPX(); |
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91 | xPrime.setZ(0); |
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92 | G4Vector3D yPrime= tr*position.GetPY(); |
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93 | yPrime.setZ(0); |
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94 | G4double u= -(xPrime*yPrime)/xPrime.mag2(); |
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95 | |
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96 | G4Point3D newLocation= G4Point3D( tr*position.GetLocation()+ |
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97 | focalDist*(u*u*xPrime+2*u*yPrime) ); |
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98 | newLocation.setZ(0); |
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99 | G4Vector3D newRefDirection= xPrime; |
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100 | G4double newFocalDist= (focalDist*((2*u+1)*xPrime+2*yPrime)).mag()/std::sqrt(5.); |
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101 | |
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102 | // create the new parabola |
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103 | G4Axis2Placement3D newPosition; |
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104 | newPosition.Init(newRefDirection, newAxis, newLocation); |
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105 | G4Parabola* r= new G4Parabola; |
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106 | r->Init(newPosition, newFocalDist); |
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107 | |
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108 | // introduce the shift in the parametrization |
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109 | // maybe the Sign must be changed? |
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110 | r->SetPShift(u); |
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111 | |
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112 | // set the bounds when necessary |
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113 | if (IsBounded()) |
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114 | r->SetBounds(GetPStart(), GetPEnd()); |
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115 | |
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116 | return r; |
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117 | } |
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118 | |
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119 | |
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120 | void G4Parabola::InitBounded() |
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121 | { |
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122 | // the bbox must include the start and endpoints as well as the |
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123 | // extreme points if they lie on the curve |
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124 | bBox.Init(GetStart(), GetEnd()); |
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125 | |
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126 | // the parameter values |
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127 | // belonging to the points with an extreme x, y and z coordinate |
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128 | for (G4int i=0; i<3; i++) |
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129 | { |
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130 | G4double x_i= position.GetPX()(i); |
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131 | |
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132 | if (std::abs(x_i) <= |
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133 | G4GeometryTolerance::GetInstance()->GetAngularTolerance()) |
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134 | { |
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135 | G4double u= - position.GetPY()(i) / x_i; |
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136 | if (IsPOn(u)) |
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137 | bBox.Extend(GetPoint(u)); |
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138 | } |
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139 | } |
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140 | } |
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141 | |
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142 | |
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143 | G4bool G4Parabola::Tangent(G4CurvePoint& cp, G4Vector3D& v) |
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144 | { |
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145 | // The tangent is computed from the 3D point representation |
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146 | // for all conics. An alternaive implementation (based on |
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147 | // the parametric point) might be worthwhile adding |
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148 | // for efficiency. |
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149 | |
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150 | const G4Axis2Placement3D& pos= *(GetPosition()); |
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151 | G4Point3D p= pos.GetToPlacementCoordinates() * cp.GetPoint(); |
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152 | |
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153 | v= p.y()*pos.GetPX() + (2*focalDist)*pos.GetPY(); |
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154 | return true; |
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155 | } |
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