faceAreaIntersect.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2011-2017 OpenFOAM Foundation
    Copyright (C) 2017-2018 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
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Class
    Foam::faceAreaIntersect
 
Description
    Face intersection class
    - calculates intersection area by sub-dividing face into triangles
      and cutting
 
SourceFiles
    faceAreaIntersect.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef faceAreaIntersect_H
#define faceAreaIntersect_H
 
#include "pointField.H"
#include "FixedList.H"
#include "plane.H"
#include "face.H"
#include "triangle.H"
#include "Enum.H"
#include "searchableSurface.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                      Class faceAreaIntersect Declaration
\*---------------------------------------------------------------------------*/
 
class faceAreaIntersect
{
public:
 
    enum triangulationMode
    {
        tmFan,
        tmMesh
    };
 
    static const Enum<triangulationMode> triangulationModeNames_;
 
 
private:
 
    // Private data
 
        //- Reference to the points of face A
        const pointField& pointsA_;
 
        //- Reference to the points of face B
        const pointField& pointsB_;
 
        //- Triangle decomposition of face A
        const DynamicList<face>& trisA_;
 
        //- Triangle decomposition of face B
        const DynamicList<face>& trisB_;
 
        //- Flag to reverse B faces
        const bool reverseB_;
 
        //- Flag to cache the final triangulation
        bool cacheTriangulation_;
 
        //- Final triangulation
        mutable DynamicList<triPoints> triangles_;
 
 
    // Static data members
 
        //- Tolerance
        static scalar tol;
 
 
    // Private Member Functions
 
        //- Get triPoints from face
        inline triPoints getTriPoints
        (
            const pointField& points,
            const face& f,
            const bool reverse
        ) const;
 
        //- Set triPoints into tri list
        inline void setTriPoints
        (
            const point& a,
            const point& b,
            const point& c,
            label& count,
            FixedList<triPoints, 10>& tris
        ) const;
 
        //- Return point of intersection between plane and triangle edge
        inline point planeIntersection
        (
            const FixedList<scalar, 3>& d,
            const triPoints& t,
            const label negI,
            const label posI
        ) const;
 
        //- Slice triangle with plane and generate new cut sub-triangles
        void triSliceWithPlane
        (
            const triPoints& tri,
            const plane& pln,
            FixedList<triPoints, 10>& tris,
            label& nTris,
            const scalar len
        ) const;
 
        //- Return area of intersection of triangles src and tgt
        void triangleIntersect
        (
            const triPoints& src,
            const point& tgt0,
            const point& tgt1,
            const point& tgt2,
            const vector& n,
            scalar& area,
            vector& centroid
        ) const;
 
 
public:
 
    // Constructors
 
        //- Construct from components
        faceAreaIntersect
        (
            const pointField& pointsA,
            const pointField& pointsB,
            const DynamicList<face>& trisA,
            const DynamicList<face>& trisB,
            const bool reverseB = false,
            const bool cacheTriangulation = false
        );
 
 
    // Public Member Functions
 
        //- Fraction of local length scale to use as intersection tolerance
        inline static scalar& tolerance();
 
        //- Triangulate a face using the given triangulation mode
        static void triangulate
        (
            const face& f,
            const pointField& points,
            const triangulationMode& triMode,
            faceList& faceTris
        );
 
        //- Const access to the cacheTriangulation flag
        inline bool cacheTriangulation() const;
 
        //- Const access to the triangulation
        const DynamicList<triPoints>& triangles() const noexcept
        {
            return triangles_;
        }
 
        //- Non-const access to the triangulation
        DynamicList<triPoints>& triangles() noexcept
        {
            return triangles_;
        }
 
        //- Decompose face into triangle fan
        static inline void triangleFan
        (
            const face& f,
            DynamicList<face>& faces
        );
 
        //- Return area of intersection of faceA with faceB and effective
        //- face centre
        void calc
        (
            const face& faceA,
            const face& faceB,
            const vector& n,
            scalar& area,
            vector& centroid
        ) const;
 
        //- Return area of intersection of faceA with faceB
        bool overlaps
        (
            const face& faceA,
            const face& faceB,
            const vector& n,
            const scalar threshold
        ) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#include "faceAreaIntersectI.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //