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

  Program:   Visualization Toolkit
  Module:    vtkDataSetTriangleFilter.h

  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 vtkDataSetTriangleFilter - triangulate any type of dataset
// .SECTION Description
// vtkDataSetTriangleFilter generates n-dimensional simplices from any input
// dataset. That is, 3D cells are converted to tetrahedral meshes, 2D cells
// to triangles, and so on. The triangulation is guaranteed to be compatible.
//
// This filter uses simple 1D and 2D triangulation techniques for cells
// that are of topological dimension 2 or less. For 3D cells--due to the
// issue of face compatibility across quadrilateral faces (which way to
// orient the diagonal?)--a fancier ordered Delaunay triangulation is used.
// This approach produces templates on the fly for triangulating the
// cells. The templates are then used to do the actual triangulation.
//
// .SECTION See Also
// vtkOrderedTriangulator vtkTriangleFilter

#ifndef __vtkDataSetTriangleFilter_h
#define __vtkDataSetTriangleFilter_h

#include "vtkUnstructuredGridAlgorithm.h"

class vtkOrderedTriangulator;

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

  // Description:
  // When On this filter will cull all 1D and 2D cells from the output.
  // The default is Off.
  vtkSetMacro(TetrahedraOnly, int);
  vtkGetMacro(TetrahedraOnly, int);
  vtkBooleanMacro(TetrahedraOnly, int);

protected:
  vtkDataSetTriangleFilter();
  ~vtkDataSetTriangleFilter();

  // Usual data generation method
  virtual int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);

  virtual int FillInputPortInformation(int port, vtkInformation *info);

  // Used to triangulate 3D cells
  vtkOrderedTriangulator *Triangulator;

  // Different execute methods depending on whether input is structured or not
  void StructuredExecute(vtkDataSet *, vtkUnstructuredGrid *);
  void UnstructuredExecute(vtkDataSet *, vtkUnstructuredGrid *);

  int TetrahedraOnly;

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

#endif


