triangulatedPatch.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2023-2024 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
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Class
    Foam::triangulatedPatch

Description
    Performs a triangulation of a patch to return randomised point locations.

\*---------------------------------------------------------------------------*/

#ifndef Foam_triangulatedPatch_H
#define Foam_triangulatedPatch_H

#include "polyMesh.H"
#include "labelledTri.H"
#include "Random.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{
/*---------------------------------------------------------------------------*\
                      Class triangulatedPatch Declaration
\*---------------------------------------------------------------------------*/

class triangulatedPatch
{
    // Private Data

        //- Reference to the polyPatch
        const polyPatch& patch_;

        //- Perturbation tolerance to move the point towards the cell centre
        bool perturbTol_;

        //- The polyPatch faces as triangles, the index of each corresponds
        //- to the undecomposed patch face index.
        List<labelledTri> triFace_;

        //- The cumulative triangle area per triangle face,
        //- globally normalised as a 0-1 interval.
        scalarList triWght_;


    // Private Member Functions

        //- Update triangulation
        void update();

        //- Return a random point on the patch based on random number, 0 < c < 1
        bool randomPoint
        (
            Random& rnd,
            const scalar c,
            point& result,
            label& facei,
            label& celli
        ) const;


    // Static Member Functions

        //- Triangulate the patch faces and create addressing
        static void triangulate(const polyPatch& pp, List<labelledTri>& tris);

public:

    //- Constructors

        //- Construct from components
        triangulatedPatch
        (
            const polyPatch& patch,
            const scalar perturbTol
        );

        //- Construct from mesh and patch name
        triangulatedPatch
        (
            const polyMesh& mesh,
            const word& patchName,
            const scalar perturbTol
        );


    //- Destructor
    ~triangulatedPatch() = default;


    // Member Functions

        //- Set a random point on the local patch
        //
        //  \param rnd  random number generator
        //  \param result  the random point
        //  \param facei  index associated with the random point
        //  \param celli  index associated with the random point
        //
        //  \return true  if point has been set
        bool randomLocalPoint
        (
            Random& rnd,
            point& result,
            label& facei,
            label& celli
        ) const;

        //- Set a global random point on the patch
        //
        //  \param  rnd random number generator
        //  \param  result the random point
        //  \param  facei index associated with the random point
        //  \param  celli index associated with the random point
        //
        //  \return true  if point has been set
        bool randomGlobalPoint
        (
            Random& rnd,
            point& result,
            label& facei,
            label& celli
        ) const;
};


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //