pointMVCWeight.H

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/*---------------------------------------------------------------------------*\
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License
    This file is part of OpenFOAM.

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Class
    Foam::pointMVCWeight

Description
    Container to calculate weights for interpolating directly from vertices
    of cell using Mean Value Coordinates.

    Based on (VTK's vtkMeanValueCoordinatesInterpolator's) implementation
    of "Spherical Barycentric Coordinates"
    2006 paper Eurographics Symposium on Geometry Processing
    by Torsten Langer, Alexander Belyaev and Hans-Peter Seide

SourceFiles
    pointMVCWeight.C

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

#ifndef Foam_pointMVCWeight_H
#define Foam_pointMVCWeight_H

#include "scalarField.H"
#include "vectorField.H"
#include "Map.H"
#include "DynamicList.H"
#include "point.H"

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

namespace Foam
{

// Forward Declarations
class face;
class pointMesh;
class polyMesh;
template<class Type> class pointPatchField;
template<class Type, template<class> class PatchField, class GeoMesh>
class GeometricField;

/*---------------------------------------------------------------------------*\
                           Class pointMVCWeight Declaration
\*---------------------------------------------------------------------------*/

class pointMVCWeight
{
protected:

    // Protected Data

        //- Cell index
        const label cellIndex_;

        //- Weights applied to cell vertices
        scalarField weights_;


    // Protected Member Functions

        //- Calculate weights from single face's vertices only
        void calcWeights
        (
            const Map<label>& toLocal,
            const face& f,
            const DynamicList<point>& u,
            const scalarField& dist,
            scalarField& weights
        ) const;

        //- Calculate weights from all cell's vertices
        void calcWeights
        (
            const polyMesh& mesh,
            const labelList& toGlobal,
            const Map<label>& toLocal,
            const vector& position,
            const vectorField& uVec,
            const scalarField& dist,
            scalarField& weights
        ) const;

public:

    //- Debug switch
    static int debug;

    //- Tolerance used in calculating barycentric coordinates
    //  (applied to normalised values)
    static scalar tol;


    // Constructors

        //- Construct from components
        pointMVCWeight
        (
            const polyMesh& mesh,
            const vector& position,
            const label celli,
            const label facei = -1
        );


    // Member Functions

        //- Cell index
        label cell() const noexcept
        {
            return cellIndex_;
        }

        //- Interpolation weights (in order of cellPoints)
        const scalarField& weights() const noexcept
        {
            return weights_;
        }

        //- Interpolate field
        template<class Type>
        inline Type interpolate
        (
            const GeometricField<Type, pointPatchField, pointMesh>& psip
        ) const;
};


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

} // End namespace Foam

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

#include "pointMVCWeightI.H"

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

#endif

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