foamVtkToolsI.H

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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
inline Foam::UList<uint8_t> Foam::vtk::Tools::asUList
(
    vtkUnsignedCharArray* array,
    const label size
)
{
    array->SetNumberOfComponents(1);
    array->SetNumberOfTuples(size);
 
    return UList<uint8_t>(array->WritePointer(0, size), size);
}
 
 
inline Foam::UList<vtkIdType> Foam::vtk::Tools::asUList
(
    vtkIdTypeArray* array,
    const label size
)
{
    array->SetNumberOfComponents(1);
    array->SetNumberOfTuples(size);
 
    return UList<vtkIdType>(array->WritePointer(0, size), size);
}
 
 
inline vtkSmartPointer<vtkPoints>
Foam::vtk::Tools::NewPoints
(
    vtkIdType count
)
{
    auto vtkpoints = vtkSmartPointer<vtkPoints>::New();
    // if (narrowing || (sizeof(float) == sizeof(Foam::scalar)))
    // {
    //     vtkpoints->SetDataTypeToFloat();
    // }
    // else
    // {
    //     vtkpoints->SetDataTypeToDouble();
    // }
    vtkpoints->SetNumberOfPoints(count);
 
    return vtkpoints;
}
 
 
inline vtkSmartPointer<vtkPoints>
Foam::vtk::Tools::Points
(
    const UList<point>& pts
)
{
    auto vtkpoints = vtk::Tools::NewPoints(pts.size());
 
    vtkIdType pointId = 0;
    for (const auto& p : pts)
    {
        vtkpoints->SetPoint(pointId++, p.cdata());
    }
 
    return vtkpoints;
}
 
 
inline vtkSmartPointer<vtkPoints>
Foam::vtk::Tools::Points
(
    const UList<point>& pts,
    const labelUList& addr
)
{
    auto vtkpoints = vtk::Tools::NewPoints(addr.size());
 
    vtkIdType pointId = 0;
    for (const label pointi : addr)
    {
        const auto& p = pts[pointi];
        vtkpoints->SetPoint(pointId++, p.cdata());
    }
 
    return vtkpoints;
}
 
 
inline vtkSmartPointer<vtkPolyData>
Foam::vtk::Tools::Vertices
(
    const UList<point>& pts
)
{
    auto vtkmesh = vtkSmartPointer<vtkPolyData>::New();
 
    vtkmesh->SetPoints(Tools::Points(pts));
    vtkmesh->SetVerts(Tools::identityVertices(pts.size()));
 
    return vtkmesh;
}
 
 
inline vtkSmartPointer<vtkPolyData>
Foam::vtk::Tools::Vertices
(
    const UList<point>& pts,
    const labelUList& addr
)
{
    auto vtkmesh = vtkSmartPointer<vtkPolyData>::New();
 
    vtkmesh->SetPoints(Tools::Points(pts, addr));
    vtkmesh->SetVerts(Tools::identityVertices(addr.size()));
 
    return vtkmesh;
}
 
 
inline Foam::scalarMinMax Foam::vtk::Tools::rangeOf(vtkDataArray* data)
{
    double range[2]{GREAT, -GREAT};
 
    if (data)
    {
        if (data->GetNumberOfComponents() == 1)
        {
            data->GetRange(range);
        }
        else
        {
            // Mag
            data->GetRange(range, -1);
        }
    }
 
    return scalarMinMax(range[0], range[1]);
}
 
 
inline vtkSmartPointer<vtkCellArray>
Foam::vtk::Tools::identityVertices
(
    const vtkIdType size
)
{
    auto cells = vtkSmartPointer<vtkCellArray>::New();
 
    #ifdef VTK_CELL_ARRAY_V2
 
    // Offsets
    // [0, n1, n1+n2, n1+n2+n3... ]
 
    auto offsets = vtkSmartPointer<vtkIdTypeArray>::New();
 
    {
        const vtkIdType nOffsets(size+1);
 
        offsets->SetNumberOfTuples(nOffsets);
 
        vtkIdType* iter = offsets->WritePointer(0, nOffsets);
 
        std::iota(iter, (iter + nOffsets), vtkIdType(0));
    }
 
 
    auto connect = vtkSmartPointer<vtkIdTypeArray>::New();
 
    // Connectivity
    {
        const vtkIdType nConnect(size);
 
        connect->SetNumberOfTuples(nConnect);
 
        vtkIdType* iter = connect->WritePointer(0, nConnect);
 
        std::iota(iter, (iter + nConnect), vtkIdType(0));
    }
 
    // Move into a vtkCellArray
 
    cells->SetData(offsets, connect);
 
    #else
 
    // In VTK-8.2.0 and older,
    // sizes are interwoven (prefixed) in the connectivity
 
    // Connectivity size, with prefixed size information
 
    // Cell connectivity for vertex
    // [size, ids.., size, ids...]  -> therefore  [1, id, 1, id, ...]
 
    const vtkIdType nElem(size);
    const vtkIdType nConnect(2*size);
 
    {
        cells->GetData()->SetNumberOfTuples(nConnect);
 
        vtkIdType* iter = cells->WritePointer(nElem, nConnect);
 
        // Fill in the connectivity array, with prefixed size information
 
        for (vtkIdType id = 0; id < nElem; ++id)
        {
            *(iter++) = 1;
            *(iter++) = id;
        }
    }
 
    #endif
 
    return cells;
}
 
 
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