/*=========================================================================

  Program:   Visualization Toolkit
  Module:    $RCSfile$

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
// .NAME vtkVolumeContourSpectrumFilter - compute an approximation of the
// volume contour signature (evolution of the volume of the input tet-mesh
// along an arc of the Reeb graph).
// .SECTION Description
// 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"

class vtkReebGraph;
class vtkTable;

class VTK_GRAPHICS_EXPORT vtkVolumeContourSpectrumFilter :
  public vtkDataObjectAlgorithm
{
public:
  static vtkVolumeContourSpectrumFilter* New();
  vtkTypeMacro(vtkVolumeContourSpectrumFilter, vtkDataObjectAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Set the arc Id for which the contour signature has to be computed.
  // Default value: 0
  vtkSetMacro(ArcId, vtkIdType);
  vtkGetMacro(ArcId, vtkIdType);

  // Description:
  // Set the number of samples in the output signature
  // Default value: 100
  vtkSetMacro(NumberOfSamples, int);
  vtkGetMacro(NumberOfSamples, int);

  // Description:
  // Set the scalar field Id
  // Default value: 0
  vtkSetMacro(FieldId, vtkIdType);
  vtkGetMacro(FieldId, vtkIdType);

  vtkTable* GetOutput();

protected:
  vtkVolumeContourSpectrumFilter();
  ~vtkVolumeContourSpectrumFilter();

  vtkIdType ArcId, FieldId;
  int NumberOfSamples;

  int FillInputPortInformation(int portNumber, vtkInformation *);
  int FillOutputPortInformation(int portNumber, vtkInformation *info);

  int RequestData(vtkInformation *request,
    vtkInformationVector **inputVector, vtkInformationVector *outputVector);

private:
  vtkVolumeContourSpectrumFilter(const vtkVolumeContourSpectrumFilter&); // Not implemented.
  void operator=(const vtkVolumeContourSpectrumFilter&); // Not implemented.
};

#endif
