[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: G4Ellipse.cc,v 1.12 2007/05/18 07:33:31 gcosmo Exp $ |
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[1228] | 28 | // GEANT4 tag $Name: geant4-09-03 $ |
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[831] | 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 | // G4Ellipse.cc |
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| 34 | // |
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| 35 | // ---------------------------------------------------------------------- |
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| 36 | |
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| 37 | #include "G4Ellipse.hh" |
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| 38 | |
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| 39 | #include "G4GeometryTolerance.hh" |
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| 40 | |
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| 41 | G4Ellipse::G4Ellipse() |
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| 42 | { |
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| 43 | } |
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| 44 | |
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| 45 | G4Ellipse::~G4Ellipse() |
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| 46 | { |
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| 47 | } |
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| 48 | |
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| 49 | G4Ellipse::G4Ellipse(const G4Ellipse& right) |
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| 50 | : G4Conic(), semiAxis1(right.semiAxis1), semiAxis2(right.semiAxis2), |
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| 51 | ratioAxis2Axis1(right.ratioAxis2Axis1), toUnitCircle(right.toUnitCircle), |
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| 52 | forTangent(right.forTangent) |
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| 53 | { |
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| 54 | pShift = right.pShift; |
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| 55 | position = right.position; |
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| 56 | bBox = right.bBox; |
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| 57 | start = right.start; |
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| 58 | end = right.end; |
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| 59 | pStart = right.pStart; |
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| 60 | pEnd = right.pEnd; |
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| 61 | pRange = right.pRange; |
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| 62 | bounded = right.bounded; |
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| 63 | sameSense = right.sameSense; |
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| 64 | } |
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| 65 | |
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| 66 | G4Ellipse& G4Ellipse::operator=(const G4Ellipse& right) |
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| 67 | { |
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| 68 | if (&right == this) return *this; |
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| 69 | |
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| 70 | semiAxis1 = right.semiAxis1; |
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| 71 | semiAxis2 = right.semiAxis2; |
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| 72 | ratioAxis2Axis1 = right.ratioAxis2Axis1; |
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| 73 | toUnitCircle = right.toUnitCircle; |
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| 74 | forTangent = right.forTangent; |
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| 75 | pShift = right.pShift; |
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| 76 | position = right.position; |
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| 77 | bBox = right.bBox; |
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| 78 | start = right.start; |
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| 79 | end = right.end; |
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| 80 | pStart = right.pStart; |
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| 81 | pEnd = right.pEnd; |
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| 82 | pRange = right.pRange; |
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| 83 | bounded = right.bounded; |
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| 84 | sameSense = right.sameSense; |
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| 85 | |
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| 86 | return *this; |
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| 87 | } |
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| 88 | |
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| 89 | G4Curve* G4Ellipse::Project(const G4Transform3D& tr) |
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| 90 | { |
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| 91 | G4Point3D newLocation = tr*position.GetLocation(); |
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| 92 | newLocation.setZ(0); |
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| 93 | G4double axisZ = ( tr*position.GetPZ() ).unit().z(); |
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| 94 | |
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| 95 | if (std::abs(axisZ)<G4GeometryTolerance::GetInstance()->GetAngularTolerance()) |
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| 96 | { return 0; } |
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| 97 | |
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| 98 | G4Vector3D newAxis(0, 0, axisZ>0? +1: -1); |
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| 99 | |
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| 100 | // get the parameter of an endpoint of an axis |
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| 101 | // (this is a point the distance of which from the center is extreme) |
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| 102 | G4Vector3D xPrime= tr*position.GetPX(); |
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| 103 | xPrime.setZ(0); |
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| 104 | G4Vector3D yPrime= tr*position.GetPY(); |
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| 105 | yPrime.setZ(0); |
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| 106 | |
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| 107 | G4Vector3D a = G4Vector3D( semiAxis1*xPrime ); |
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| 108 | G4Vector3D b = G4Vector3D( semiAxis2*yPrime ); |
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| 109 | |
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| 110 | G4double u; |
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| 111 | G4double abmag = a.mag2()-b.mag2(); |
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| 112 | G4double prod = 2*a*b; |
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| 113 | |
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| 114 | if ((abmag > FLT_MAX) && (prod < -FLT_MAX)) |
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| 115 | u = -pi/8; |
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| 116 | else if ((abmag < -FLT_MAX) && (prod > FLT_MAX)) |
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| 117 | u = 3*pi/8; |
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| 118 | else if ((abmag < -FLT_MAX) && (prod < -FLT_MAX)) |
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| 119 | u = -3*pi/8; |
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| 120 | else if ((std::abs(abmag) < perMillion) && (std::abs(prod) < perMillion)) |
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| 121 | u = 0.; |
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| 122 | else |
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| 123 | u = std::atan2(prod,abmag) / 2; |
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| 124 | |
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| 125 | // get the coordinate axis directions and the semiaxis lengths |
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| 126 | G4Vector3D sAxis1 = G4Vector3D( a*std::cos(u)+b*std::sin(u) ); |
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| 127 | G4Vector3D sAxis2 = G4Vector3D( a*std::cos(u+pi/2)+b*std::sin(u+pi/2) ); |
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| 128 | G4double newSemiAxis1 = sAxis1.mag(); |
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| 129 | G4double newSemiAxis2 = sAxis2.mag(); |
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| 130 | G4Vector3D newRefDirection = sAxis1; |
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| 131 | |
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| 132 | // create the new ellipse |
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| 133 | G4Axis2Placement3D newPosition; |
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| 134 | newPosition.Init(newRefDirection, newAxis, newLocation); |
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| 135 | G4Ellipse* r= new G4Ellipse; |
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| 136 | r->Init(newPosition, newSemiAxis1, newSemiAxis2); |
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| 137 | |
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| 138 | // introduce the shift in the parametrization |
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| 139 | // maybe the Sign must be changed? |
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| 140 | r->SetPShift(u); |
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| 141 | |
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| 142 | // set the bounds when necessary |
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| 143 | if (IsBounded()) |
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| 144 | r->SetBounds(GetPStart(), GetPEnd()); |
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| 145 | |
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| 146 | // L. Broglia |
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| 147 | // copy sense of the curve |
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| 148 | r->SetSameSense(GetSameSense()); |
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| 149 | |
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| 150 | return r; |
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| 151 | } |
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| 152 | |
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| 153 | void G4Ellipse::InitBounded() |
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| 154 | { |
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| 155 | // original implementation |
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| 156 | // const G4Point3D& center = position.GetLocation(); |
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| 157 | // G4double maxEntent = std::max(semiAxis1, semiAxis2); |
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| 158 | // G4Vector3D halfExtent(maxEntent, maxEntent, maxEntent); |
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| 159 | // bBox.Init(center+halfExtent, center-halfExtent); |
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| 160 | |
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| 161 | // the bbox must include the start and endpoints as well as the |
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| 162 | // extreme points if they lie on the curve |
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| 163 | bBox.Init(GetStart(), GetEnd()); |
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| 164 | |
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| 165 | // the parameter values |
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| 166 | // belonging to the points with an extreme x, y and z coordinate |
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| 167 | for (G4int i=0; i<3; i++) |
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| 168 | { |
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| 169 | G4double u= std::atan2(position.GetPY()(i)*semiAxis2, |
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| 170 | position.GetPX()(i)*semiAxis1); |
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| 171 | if (IsPOn(u)) |
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| 172 | bBox.Extend(GetPoint(u)); |
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| 173 | |
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| 174 | if (IsPOn(u+pi)) |
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| 175 | bBox.Extend(GetPoint(u+pi)); |
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| 176 | } |
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| 177 | } |
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| 178 | |
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| 179 | |
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| 180 | G4bool G4Ellipse::Tangent(G4CurvePoint& cp, G4Vector3D& v) |
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| 181 | { |
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| 182 | // The tangent is computed from the 3D point representation |
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| 183 | // for all conics. An alternaive implementation (based on |
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| 184 | // the parametric point) might be worthwhile adding |
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| 185 | // for efficiency. |
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| 186 | |
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| 187 | const G4Axis2Placement3D& pos = *(GetPosition()); |
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| 188 | G4Point3D p= pos.GetToPlacementCoordinates() * cp.GetPoint(); |
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| 189 | |
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| 190 | v=forTangent*p.y()*pos.GetPX() + p.x()*pos.GetPY(); |
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| 191 | if(GetSameSense()) |
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| 192 | v = -v; |
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| 193 | |
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| 194 | return true; |
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| 195 | } |
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| 196 | |
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