| 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: G4ClippablePolygon.hh,v 1.11 2007/05/11 13:54:28 gcosmo 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 | // --------------------------------------------------------------------
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| 32 | // GEANT 4 class header file
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| 33 | //
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| 34 | // G4ClippablePolygon
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| 35 | //
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| 36 | // Class description:
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| 37 | //
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| 38 | // Declaration of a utility class of a polygon that can be
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| 39 | // clipped by a voxel.
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| 40 |
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| 41 | // Author:
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| 42 | // David C. Williams (davidw@scipp.ucsc.edu)
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| 43 | // --------------------------------------------------------------------
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| 44 | #ifndef G4ClippablePolygon_hh
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| 45 | #define G4ClippablePolygon_hh
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| 46 |
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| 47 | #include <vector>
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| 48 |
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| 49 | #include "G4Types.hh"
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| 50 | #include "geomdefs.hh"
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| 51 | #include "G4ThreeVector.hh"
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| 52 |
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| 53 | class G4AffineTransform;
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| 54 | class G4VoxelLimits;
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| 55 |
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| 56 | class G4ClippablePolygon
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| 57 | {
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| 58 | typedef std::vector<G4ThreeVector> G4ThreeVectorList;
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| 59 |
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| 60 | public: // with description
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| 61 |
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| 62 | G4ClippablePolygon();
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| 63 | virtual ~G4ClippablePolygon();
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| 64 | // Constructor & virtual destructor.
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| 65 |
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| 66 | virtual void AddVertexInOrder( const G4ThreeVector vertex );
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| 67 | virtual void ClearAllVertices();
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| 68 |
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| 69 | inline void SetNormal( const G4ThreeVector &newNormal );
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| 70 | inline const G4ThreeVector GetNormal() const;
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| 71 |
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| 72 | virtual G4bool Clip( const G4VoxelLimits &voxelLimit );
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| 73 |
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| 74 | virtual G4bool PartialClip( const G4VoxelLimits &voxelLimit,
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| 75 | const EAxis IgnoreMe );
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| 76 | // Clip, while ignoring the indicated axis.
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| 77 |
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| 78 | virtual void ClipAlongOneAxis( const G4VoxelLimits &voxelLimit,
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| 79 | const EAxis axis );
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| 80 | // Clip along just one axis, as specified in voxelLimit.
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| 81 |
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| 82 | virtual G4bool GetExtent( const EAxis axis,
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| 83 | G4double &min, G4double &max ) const;
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| 84 |
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| 85 | virtual const G4ThreeVector *GetMinPoint( const EAxis axis ) const;
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| 86 | // Returns pointer to minimum point along the specified axis.
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| 87 | // Take care! Do not use pointer after destroying parent polygon.
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| 88 |
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| 89 | virtual const G4ThreeVector *GetMaxPoint( const EAxis axis ) const;
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| 90 | // Returns pointer to maximum point along the specified axis.
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| 91 | // Take care! Do not use pointer after destroying parent polygon.
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| 92 |
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| 93 | inline G4int GetNumVertices() const;
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| 94 | inline G4bool Empty() const;
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| 95 |
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| 96 | virtual G4bool InFrontOf( const G4ClippablePolygon &other, EAxis axis ) const;
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| 97 | // Decide if the polygon is in "front" of another when
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| 98 | // viewed along the specified axis. For our purposes here,
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| 99 | // it is sufficient to use the minimum extent of the
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| 100 | // polygon along the axis to determine this.
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| 101 |
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| 102 | virtual G4bool BehindOf( const G4ClippablePolygon &other, EAxis axis ) const;
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| 103 | // Decide if this polygon is behind another.
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| 104 | // Remarks in method "InFrontOf" are valid here too.
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| 105 |
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| 106 | virtual G4bool GetPlanerExtent( const G4ThreeVector &pointOnPlane,
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| 107 | const G4ThreeVector &planeNormal,
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| 108 | G4double &min, G4double &max ) const;
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| 109 | // Get min/max distance in or out of a plane.
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| 110 |
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| 111 | protected: // with description
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| 112 |
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| 113 | void ClipToSimpleLimits( G4ThreeVectorList& pPolygon,
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| 114 | G4ThreeVectorList& outputPolygon,
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| 115 | const G4VoxelLimits& pVoxelLimit );
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| 116 | // pVoxelLimits must be only limited along one axis, and either
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| 117 | // the maximum along the axis must be +kInfinity, or the minimum
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| 118 | // -kInfinity
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| 119 |
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| 120 | protected:
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| 121 |
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| 122 | G4ThreeVectorList vertices;
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| 123 | G4ThreeVector normal;
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| 124 | G4double kCarTolerance;
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| 125 | };
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| 126 |
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| 127 | #include "G4ClippablePolygon.icc"
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| 128 |
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| 129 | #endif
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