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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkExplodeDataSet.h"
#include "vtkCellData.h"
#include "vtkDataArray.h"
#include "vtkDataArrayRange.h"
#include "vtkDataObject.h"
#include "vtkDataSet.h"
#include "vtkDataSetAttributes.h"
#include "vtkExtractCells.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkNumberToString.h"
#include "vtkObjectFactory.h"
#include "vtkPartitionedDataSetCollection.h"
#include "vtkPointData.h"
#include "vtkPolyData.h"
#include "vtkSmartPointer.h"
#include "vtkUnstructuredGrid.h"
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkExplodeDataSet);
//------------------------------------------------------------------------------
vtkExplodeDataSet::vtkExplodeDataSet()
{
this->SetInputArrayToProcess(
0, 0, 0, vtkDataObject::FIELD_ASSOCIATION_CELLS, vtkDataSetAttributes::SCALARS);
}
//------------------------------------------------------------------------------
std::map<double, vtkSmartPointer<vtkIdList>> vtkExplodeDataSet::GetIdListsByValue(
vtkDataArray* scalars)
{
std::map<double, vtkSmartPointer<vtkIdList>> idsByValue;
auto arrayRange = vtk::DataArrayValueRange(scalars);
vtkIdType cellId = 0;
for (auto value : arrayRange)
{
if (idsByValue.count(value) == 0)
{
idsByValue[value] = vtk::TakeSmartPointer(vtkIdList::New());
}
idsByValue[value]->InsertNextId(cellId);
cellId++;
}
return idsByValue;
}
//------------------------------------------------------------------------------
vtkPointSet* vtkExplodeDataSet::CreatePartition(vtkDataSet* input, vtkIdList* partCellIds)
{
vtkPolyData* inputPD = vtkPolyData::SafeDownCast(input);
if (inputPD)
{
vtkPolyData* poly = vtkPolyData::New();
poly->AllocateCopy(inputPD);
// use input nb of points as a max. Squeeze it later.
poly->GetPointData()->CopyAllocate(input->GetPointData(), input->GetNumberOfPoints());
poly->GetCellData()->CopyAllocate(input->GetCellData(), partCellIds->GetNumberOfIds());
poly->CopyCells(inputPD, partCellIds);
poly->Squeeze();
return poly;
}
vtkNew<vtkExtractCells> extraction;
extraction->SetInputData(input);
extraction->SetCellList(partCellIds);
extraction->Update();
vtkUnstructuredGrid* ugrid = extraction->GetOutput();
ugrid->Register(nullptr);
return ugrid;
}
//------------------------------------------------------------------------------
int vtkExplodeDataSet::RequestData(vtkInformation* vtkNotUsed(request),
vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
vtkDataSet* input = vtkDataSet::GetData(inputVector[0], 0);
vtkPartitionedDataSetCollection* output =
vtkPartitionedDataSetCollection::GetData(outputVector, 0);
if (!input)
{
vtkErrorMacro(<< "Input is not a vtkDataSet. Aborting.");
}
vtkDataArray* inScalars = this->GetInputArrayToProcess(0, inputVector);
if (!inScalars)
{
vtkErrorMacro(<< "No scalar data to process.");
return 0;
}
std::map<double, vtkSmartPointer<vtkIdList>> cellsPerValue = this->GetIdListsByValue(inScalars);
output->SetNumberOfPartitionedDataSets(static_cast<unsigned int>(cellsPerValue.size()));
vtkIdType partId = 0;
std::string arrayName = inScalars->GetName();
for (const std::pair<const double, vtkSmartPointer<vtkIdList>>& valueIter : cellsPerValue)
{
const double partValue = valueIter.first;
vtkIdList* partCellIds = valueIter.second;
vtkSmartPointer<vtkPointSet> part =
vtk::TakeSmartPointer(this->CreatePartition(input, partCellIds));
output->SetPartition(partId, 0, part);
vtkNumberToString converter;
std::string partName = arrayName + "_" + converter.Convert(partValue);
output->GetMetaData(partId)->Set(vtkCompositeDataSet::NAME(), partName.c_str());
partId++;
vtkSmartPointer<vtkDataArray> fieldScalar = vtk::TakeSmartPointer(inScalars->NewInstance());
fieldScalar->SetName(arrayName.c_str());
fieldScalar->SetNumberOfTuples(1);
fieldScalar->SetTuple1(0, partValue);
part->GetFieldData()->AddArray(fieldScalar);
}
return 1;
}
//------------------------------------------------------------------------------
int vtkExplodeDataSet::FillInputPortInformation(int, vtkInformation* info)
{
info->Set(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkDataSet");
return 1;
}
//------------------------------------------------------------------------------
void vtkExplodeDataSet::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
VTK_ABI_NAMESPACE_END
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