[831] | 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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[1337] | 28 | // GEANT4 tag $Name: geant4-09-04-beta-01 $ |
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[831] | 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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