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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
/**
* @class vtkVolumeContourSpectrumFilter
* @brief compute an approximation of the
* volume contour signature (evolution of the volume of the input tet-mesh
* along an arc of the Reeb graph).
*
* The filter takes a vtkUnstructuredGrid as an input (port 0), along with a
* vtkReebGraph (port 1).
* The Reeb graph arc to consider can be specified with SetArcId() (default: 0).
* The number of (evenly distributed) samples of the signature can be defined
* with SetNumberOfSamples() (default value: 100).
* The filter will first try to pull as a scalar field the vtkDataArray with Id
* 'FieldId' of the vtkUnstructuredGrid, see SetFieldId (default: 0). The
* filter will abort if this field does not exist.
*
* The filter outputs a vtkTable with the volume contour signature
* approximation, each sample being evenly distributed in the function span of
* the arc.
*
* This filter is a typical example for designing your own contour signature
* filter (with customized metrics). It also shows typical vtkReebGraph
* traversals.
*
* Reference:
* C. Bajaj, V. Pascucci, D. Schikore,
* "The contour spectrum",
* IEEE Visualization, 167-174, 1997.
*/
#ifndef vtkVolumeContourSpectrumFilter_h
#define vtkVolumeContourSpectrumFilter_h
#include "vtkDataObjectAlgorithm.h"
#include "vtkFiltersGeneralModule.h" // For export macro
VTK_ABI_NAMESPACE_BEGIN
class vtkReebGraph;
class vtkTable;
class VTKFILTERSGENERAL_EXPORT vtkVolumeContourSpectrumFilter : public vtkDataObjectAlgorithm
{
public:
static vtkVolumeContourSpectrumFilter* New();
vtkTypeMacro(vtkVolumeContourSpectrumFilter, vtkDataObjectAlgorithm);
void PrintSelf(ostream& os, vtkIndent indent) override;
///@{
/**
* Set the arc Id for which the contour signature has to be computed.
* Default value: 0
*/
vtkSetMacro(ArcId, vtkIdType);
vtkGetMacro(ArcId, vtkIdType);
///@}
///@{
/**
* Set the number of samples in the output signature
* Default value: 100
*/
vtkSetMacro(NumberOfSamples, int);
vtkGetMacro(NumberOfSamples, int);
///@}
///@{
/**
* Set the scalar field Id
* Default value: 0
*/
vtkSetMacro(FieldId, vtkIdType);
vtkGetMacro(FieldId, vtkIdType);
///@}
vtkTable* GetOutput();
protected:
vtkVolumeContourSpectrumFilter();
~vtkVolumeContourSpectrumFilter() override;
vtkIdType ArcId, FieldId;
int NumberOfSamples;
int FillInputPortInformation(int portNumber, vtkInformation*) override;
int FillOutputPortInformation(int portNumber, vtkInformation* info) override;
int RequestData(vtkInformation* request, vtkInformationVector** inputVector,
vtkInformationVector* outputVector) override;
private:
vtkVolumeContourSpectrumFilter(const vtkVolumeContourSpectrumFilter&) = delete;
void operator=(const vtkVolumeContourSpectrumFilter&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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