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: G4EnclosingCylinder.cc,v 1.10 2007/05/11 13:54:29 gcosmo Exp $ |
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28 | // GEANT4 tag $Name: HEAD $ |
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29 | // |
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30 | // |
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31 | // -------------------------------------------------------------------- |
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32 | // GEANT 4 class source file |
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33 | // |
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34 | // |
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35 | // G4EnclosingCylinder.cc |
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36 | // |
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37 | // Implementation of a utility class for a quick check of geometry. |
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38 | // |
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39 | // -------------------------------------------------------------------- |
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40 | |
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41 | #include "G4EnclosingCylinder.hh" |
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42 | #include "G4ReduciblePolygon.hh" |
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43 | #include "G4GeometryTolerance.hh" |
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44 | |
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45 | // |
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46 | // Constructor |
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47 | // |
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48 | G4EnclosingCylinder::G4EnclosingCylinder( const G4ReduciblePolygon *rz, |
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49 | G4bool thePhiIsOpen, |
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50 | G4double theStartPhi, |
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51 | G4double theTotalPhi ) |
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52 | : startPhi(theStartPhi), totalPhi(theTotalPhi), |
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53 | rx1(0.), ry1(0.), dx1(0.), dy1(0.), |
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54 | rx2(0.), ry2(0.), dx2(0.), dy2(0.), |
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55 | concave(theTotalPhi > pi) |
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56 | { |
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57 | // |
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58 | // Obtain largest r and smallest and largest z |
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59 | // |
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60 | radius = rz->Amax(); |
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61 | zHi = rz->Bmax(); |
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62 | zLo = rz->Bmin(); |
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63 | |
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64 | G4double kCarTolerance = G4GeometryTolerance::GetInstance() |
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65 | ->GetSurfaceTolerance(); |
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66 | // |
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67 | // Save phi info |
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68 | // |
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69 | phiIsOpen = thePhiIsOpen; |
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70 | if ( phiIsOpen ) |
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71 | { |
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72 | rx1 = std::cos(startPhi); |
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73 | ry1 = std::sin(startPhi); |
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74 | dx1 = +ry1*10*kCarTolerance; |
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75 | dy1 = -rx1*10*kCarTolerance; |
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76 | |
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77 | rx2 = std::cos(startPhi+totalPhi); |
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78 | ry2 = std::sin(startPhi+totalPhi); |
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79 | dx2 = -ry2*10*kCarTolerance; |
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80 | dy2 = +rx2*10*kCarTolerance; |
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81 | } |
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82 | |
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83 | // |
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84 | // Add safety |
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85 | // |
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86 | radius += 10*kCarTolerance; |
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87 | zLo -= 10*kCarTolerance; |
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88 | zHi += 10*kCarTolerance; |
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89 | } |
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90 | |
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91 | // |
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92 | // Fake default constructor - sets only member data and allocates memory |
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93 | // for usage restricted to object persistency. |
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94 | // |
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95 | G4EnclosingCylinder::G4EnclosingCylinder( __void__& ) |
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96 | { |
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97 | } |
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98 | |
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99 | // |
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100 | // Destructor |
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101 | // |
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102 | G4EnclosingCylinder::~G4EnclosingCylinder() |
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103 | { |
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104 | } |
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105 | |
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106 | |
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107 | // |
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108 | // Outside |
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109 | // |
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110 | // Decide very rapidly if the point is outside the cylinder |
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111 | // |
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112 | // If one is not certain, return false |
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113 | // |
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114 | G4bool G4EnclosingCylinder::MustBeOutside( const G4ThreeVector &p ) const |
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115 | { |
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116 | if (p.perp() > radius) return true; |
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117 | if (p.z() < zLo) return true; |
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118 | if (p.z() > zHi) return true; |
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119 | |
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120 | if (phiIsOpen) |
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121 | { |
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122 | if (concave) |
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123 | { |
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124 | if ( ((p.x()-dx1)*ry1 - (p.y()-dy1)*rx1) < 0) return false; |
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125 | if ( ((p.x()-dx2)*ry2 - (p.y()-dy2)*rx2) > 0) return false; |
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126 | } |
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127 | else |
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128 | { |
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129 | if ( ((p.x()-dx1)*ry1 - (p.y()-dy1)*rx1) > 0) return true; |
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130 | if ( ((p.x()-dx2)*ry2 - (p.y()-dy2)*rx2) < 0) return true; |
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131 | } |
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132 | } |
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133 | |
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134 | return false; |
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135 | } |
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136 | |
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137 | |
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138 | // |
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139 | // Misses |
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140 | // |
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141 | // Decide very rapidly if the trajectory is going to miss the cylinder |
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142 | // |
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143 | // If one is not sure, return false |
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144 | // |
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145 | G4bool G4EnclosingCylinder::ShouldMiss( const G4ThreeVector &p, |
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146 | const G4ThreeVector &v ) const |
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147 | { |
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148 | if (!MustBeOutside(p)) return false; |
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149 | |
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150 | G4double cross = p.x()*v.y() - p.y()*v.x(); |
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151 | if (cross > radius) return true; |
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152 | |
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153 | if (p.perp() > radius) |
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154 | { |
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155 | G4double dot = p.x()*v.x() + p.y()*v.y(); |
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156 | if (dot > 0) return true; |
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157 | } |
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158 | |
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159 | return false; |
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160 | } |
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