foamVtkPatchMeshWriter.H

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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-------------------------------------------------------------------------------
    Copyright (C) 2016-2025 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.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    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
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    Foam::vtk::patchMeshWriter
 
Description
    Write OpenFOAM patches and patch fields in VTP or legacy vtk format.
 
    The file output states are managed by the Foam::vtk::fileWriter class.
    FieldData (eg, TimeValue) must appear before any geometry pieces.
 
Note
    Parallel output is combined into a single Piece without point merging,
    which is similar to using multi-piece data sets, but allows more
    convenient creation as a streaming process.
    In the future, the duplicate points at processor connections
    may be addressed using ghost points.
 
See Also
    Foam::vtk::patchWriter
 
SourceFiles
    foamVtkPatchMeshWriter.cxx
    foamVtkPatchMeshWriter.txx
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_vtk_PatchMeshWriter_H
#define Foam_vtk_PatchMeshWriter_H
 
#include "foamVtkFileWriter.H"
#include "polyMesh.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace vtk
{
 
/*---------------------------------------------------------------------------*\
                    Class vtk::patchMeshWriter Declaration
\*---------------------------------------------------------------------------*/
 
class patchMeshWriter
:
    public vtk::fileWriter
{
protected:
 
    // Protected Member Data
 
        //- Reference to the OpenFOAM mesh (or subset)
        const polyMesh& mesh_;
 
        //- The selected patch ids
        labelList patchIDs_;
 
        //- Slab addressing for field points of the current Piece
        OffsetRange<label> pointSlab_;
 
        //- Slab addressing for field cells (faces) for the current Piece
        OffsetRange<label> cellSlab_;
 
        //- Slab addressing for cell (face) connectivity count,
        //- which is just the sum of the face sizes.
        OffsetRange<label> connectivitySlab_;
 
 
    // Protected Member Functions
 
        //- Total number of field points for the current Piece
        label nTotalPoints() const noexcept { return pointSlab_.total(); }
 
        //- Total number of field cells (faces) for the current Piece
        label nTotalCells() const noexcept { return cellSlab_.total(); }
 
        //- Determine sizes and begin piece.
        void beginPiece();
 
        //- Write patch points
        void writePoints();
 
        //- Write patch faces, legacy format
        void writePolys_legacy();
 
        //- Write patch faces
        void writePolys();
 
public:
 
    // Generated Methods
 
        //- No copy construct
        patchMeshWriter(const patchMeshWriter&) = delete;
 
        //- No copy assignment
        void operator=(const patchMeshWriter&) = delete;
 
 
    // Constructors
 
        //- Construct from components (default format INLINE_BASE64)
        patchMeshWriter
        (
            const polyMesh& mesh,
            const labelUList& patchIDs,
            const vtk::outputOptions opts = vtk::formatType::INLINE_BASE64
        );
 
        //- Construct from components (default format INLINE_BASE64),
        //- and open the file for writing.
        //  The file name is with/without an extension.
        patchMeshWriter
        (
            const polyMesh& mesh,
            const labelUList& patchIDs,
            const fileName& file,
            bool parallel = UPstream::parRun()
        );
 
        //- Construct from components and open the file for writing.
        //  The file name is with/without an extension.
        patchMeshWriter
        (
            const polyMesh& mesh,
            const labelUList& patchIDs,
            const vtk::outputOptions opts,
            const fileName& file,
            bool parallel = UPstream::parRun()
        );
 
 
    //- Destructor
    virtual ~patchMeshWriter() = default;
 
 
    // Member Functions
 
        //- File extension for current format type.
        using vtk::fileWriter::ext;
 
        //- File extension for given output type
        inline static word ext(vtk::outputOptions opts)
        {
            return opts.ext(vtk::fileTag::POLY_DATA);
        }
 
        //- The patch IDs
        const labelList& patchIDs() const noexcept
        {
            return patchIDs_;
        }
 
        //- Write file header (non-collective)
        //  \note Expected calling states: (OPENED).
        virtual bool beginFile(std::string title = "");
 
        //- Write patch topology
        //  Also writes the file header if not previously written.
        //  \note Must be called prior to writing CellData or PointData
        virtual bool writeGeometry();
 
        //- Begin CellData output section for specified number of fields.
        //  Must be called prior to writing any cell data fields.
        //  \param nFields is for legacy format only.
        //      When nFields=0, this a no-op for legacy format.
        //  \note Expected calling states: (PIECE | POINT_DATA).
        //
        //  \return True if the state changed
        virtual bool beginCellData(label nFields = 0);
 
        //- Begin PointData for specified number of fields.
        //  Must be called prior to writing any point data fields.
        //  \param nFields is for legacy format only.
        //      When nFields=0, this a no-op for legacy format.
        //  \note Expected calling states: (PIECE | CELL_DATA).
        //
        //  \return True if the state changed
        virtual bool beginPointData(label nFields = 0);
 
 
        //- Write patch ids as CellData.
        //  Must be called within the CELL_DATA state.
        void writePatchIDs();
 
        //- Write processor ids for each line as CellData or for each point
        //- as PointData, depending on isPointData() state. No-op in serial.
        bool writeProcIDs();
 
        //- Write processor neighbour ids as CellData. This is no-op in serial.
        //  Must be called within the CELL_DATA state.
        bool writeNeighIDs();
 
 
    // Write
 
        //- Write a uniform field of Cell (Face) or Point values
        template<class Type>
        void writeUniform(const word& fieldName, const Type& val);
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace vtk
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "foamVtkPatchMeshWriter.txx"
#endif
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //