foamVtkSurfaceWriter.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2018-2019 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::surfaceWriter
 
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
    foamVtkSurfaceWriter.C
    foamVtkSurfaceWriterTemplates.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef foamVtkSurfaceWriter_H
#define foamVtkSurfaceWriter_H
 
#include "foamVtkFileWriter.H"
#include "pointField.H"
#include "faceList.H"
#include "instant.H"
#include <functional>
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace vtk
{
 
/*---------------------------------------------------------------------------*\
                     Class vtk::surfaceWriter Declaration
\*---------------------------------------------------------------------------*/
 
class surfaceWriter
:
    public vtk::fileWriter
{
    // Private Member Data
 
        //- Reference to the points
        std::reference_wrapper<const pointField> points_;
 
        //- Reference to the faces
        std::reference_wrapper<const faceList> faces_;
 
        //- The number of field points for the current Piece
        label numberOfPoints_;
 
        //- The number of field cells (faces) for the current Piece
        label numberOfCells_;
 
        //- Local number of points
        label nLocalPoints_;
 
        //- Local number of faces
        label nLocalFaces_;
 
        //- Local face vertices (connectivity) count. Sum of face sizes.
        label nLocalVerts_;
 
        //- Time name/value
        instant instant_;
 
 
    // Private Member Functions
 
        //- Determine sizes (nLocalPoints_, nLocalFaces_, nLocalVerts_),
        //- and begin piece
        void beginPiece();
 
        //- Write points
        void writePoints();
 
        //- Write faces, legacy format
        //  \param pointOffset processor-local point offset
        void writePolysLegacy(const label pointOffset);
 
        //- Write faces
        //  \param pointOffset processor-local point offset
        void writePolys(const label pointOffset);
 
 
        //- No copy construct
        surfaceWriter(const surfaceWriter&) = delete;
 
        //- No copy assignment
        void operator=(const surfaceWriter&) = delete;
 
 
public:
 
    // Constructors
 
        //- Construct from components (default format INLINE_BASE64)
        surfaceWriter
        (
            const pointField& pts,
            const faceList& faces,
            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.
        surfaceWriter
        (
            const pointField& pts,
            const faceList& faces,
            const fileName& file,
            bool parallel = Pstream::parRun()
        );
 
        //- Construct from components and open the file for writing.
        //  The file name is with/without an extension.
        surfaceWriter
        (
            const pointField& pts,
            const faceList& faces,
            const vtk::outputOptions opts,
            const fileName& file,
            bool parallel = Pstream::parRun()
        );
 
 
    //- Destructor
    virtual ~surfaceWriter() = 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);
        }
 
        //- Define a time name/value for the output
        virtual void setTime(const instant& inst);
 
        //- 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 "TimeValue" FieldData (name as per Catalyst output)
        //  Must be called within the FIELD_DATA state.
        //  \note As a convenience this can also be called from
        //      (OPENED | DECLARED) states, in which case it invokes
        //      beginFieldData(1) internally.
        using vtk::fileWriter::writeTimeValue;
 
        //- Write the currently set time as "TimeValue" FieldData
        void writeTimeValue();
 
        //- Reset point, face references to begin a new piece
        void piece(const pointField& points, const faceList& faces);
 
 
    // Write
 
        //- Write a uniform field of Cell (Face) or Point values
        template<class Type>
        void writeUniform(const word& fieldName, const Type& val);
 
        //- Write a list of Cell (Face) or Point values
        template<class Type>
        void write(const word& fieldName, const UList<Type>& field);
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace vtk
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#ifdef NoRepository
    #include "foamVtkSurfaceWriterTemplates.C"
#endif
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //