foamVtkPolyWriter.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2018-2021 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::polyWriter
 
Description
    Write faces/points (optionally with fields)
    as a vtp file or a legacy vtk file.
 
    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.
 
SourceFiles
    foamVtkPolyWriter.C
    foamVtkPolyWriterTemplates.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_vtk_polyWriter_H
#define Foam_vtk_polyWriter_H
 
#include "foamVtkFileWriter.H"
#include "pointField.H"
#include "edgeList.H"
#include "faceList.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace vtk
{
 
/*---------------------------------------------------------------------------*\
                       Class vtk::polyWriter Declaration
\*---------------------------------------------------------------------------*/
 
class polyWriter
:
    public vtk::fileWriter
{
protected:
 
    // Protected Data
 
        //- The number of field points for the current Piece
        label numberOfPoints_;
 
        //- The number of field cells (edges or faces) for the current Piece
        label numberOfCells_;
 
        //- Local number of points
        label nLocalPoints_;
 
        //- Local number of lines (edges)
        label nLocalLines_;
 
        //- Local number of polys (faces)
        label nLocalPolys_;
 
 
    // Protected Member Functions
 
        //- Write a uniform field of Cell (Poly or Line) or Point values
        template<class Type>
        void writeUniformValue
        (
            const label nCellValues,  // Could be Poly or Line!
            const word& fieldName,
            const Type& val
        );
 
private:
 
    // Private Member Functions
 
        //- Determine sizes (nLocalPoints_, nLocalLines_),
        //- and begin piece
        void beginPiece(const pointField& points, const edgeList& edges);
 
        //- Determine sizes (nLocalPoints_, nLocalPolys_),
        //- and begin piece
        void beginPiece(const pointField& points, const faceList& faces);
 
        //- Write points
        void writePoints(const pointField& points);
 
        //- Write lines, legacy format
        //  \param pointOffset processor-local point offset
        void writeLinesLegacy(const edgeList& edges, const label pointOffset);
 
        //- Write lines
        //  \param pointOffset processor-local point offset
        void writeLines(const edgeList& edges, const label pointOffset);
 
        //- Write faces, legacy format
        //  \param pointOffset processor-local point offset
        void writePolysLegacy(const faceList& faces, const label pointOffset);
 
        //- Write faces
        //  \param pointOffset processor-local point offset
        void writePolys(const faceList& faces, const label pointOffset);
 
        //- No copy construct
        polyWriter(const polyWriter&) = delete;
 
        //- No copy assignment
        void operator=(const polyWriter&) = delete;
 
 
public:
 
    // Constructors
 
        //- Construct from components (default format INLINE_BASE64)
        explicit polyWriter
        (
            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.
        explicit polyWriter
        (
            const fileName& file,
            bool parallel = Pstream::parRun()
        );
 
        //- Construct from components and open the file for writing.
        //  The file name is with/without an extension.
        polyWriter
        (
            const vtk::outputOptions opts,
            const fileName& file,
            bool parallel = Pstream::parRun()
        );
 
 
    //- Destructor
    virtual ~polyWriter() = default;
 
 
    // Member Functions
 
        //- File extension for current format type.
        using vtk::fileWriter::ext;
 
        //- File extension for given output type
        static word ext(vtk::outputOptions opts)
        {
            return opts.ext(vtk::fileTag::POLY_DATA);
        }
 
        //- Dummy write mesh topology method - Fatal if called
        //  Provided for special-purpose writers that do not hold
        //  their own geomety, but use writePolyGeometry() directly
        virtual bool writeGeometry();
 
        //- Low-level write edge/point topology.
        //- Normally used by writeGeometry() in a derived class
        //  Also writes the file header if not previously written.
        //  \note Must be called prior to writing CellData or PointData
        bool writeLineGeometry
        (
            const pointField& points,
            const edgeList& edges
        );
 
        //- Low-level write face/point topology.
        //- Normally used by writeGeometry() in a derived class
        //  Also writes the file header if not previously written.
        //  \note Must be called prior to writing CellData or PointData
        bool writePolyGeometry
        (
            const pointField& points,
            const faceList& faces
        );
 
        //- 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
 
        //- Write primitive field of CellData (Poly or Line) or PointData values
        template<class Type>
        void write(const word& fieldName, const UList<Type>& field);
 
        //- Write primitive field of CellData
        template<class Type>
        void writeCellData(const word& fieldName, const UList<Type>& field);
 
        //- Write primitive field of PointData
        template<class Type>
        void writePointData(const word& fieldName, const UList<Type>& field);
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace vtk
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "foamVtkPolyWriterTemplates.C"
#endif
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //