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

  Program:   Visualization Toolkit
  Module:    vtkFeatureEdges.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

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modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
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=========================================================================*/
// .NAME vtkFeatureEdges - extract boundary, non-manifold, and/or sharp edges from polygonal data
// .SECTION Description
// vtkFeatureEdges is a filter to extract special types of edges from
// input polygonal data. These edges are either 1) boundary (used by 
// one polygon) or a line cell; 2) non-manifold (used by three or more 
// polygons); 3) feature edges (edges used by two triangles and whose
// dihedral angle > FeatureAngle); or 4) manifold edges (edges used by
// exactly two polygons). These edges may be extracted in any
// combination. Edges may also be "colored" (i.e., scalar values assigned)
// based on edge type. The cell coloring is assigned to the cell data of
// the extracted edges.

// .SECTION Caveats
// To see the coloring of the liens you may have to set the ScalarMode
// instance variable of the mapper to SetScalarModeToUseCellData(). (This
// is only a problem if there are point data scalars.)

// .SECTION See Also
// vtkFeatureVertices

#ifndef __vtkFeatureEdges_h
#define __vtkFeatureEdges_h

#include "vtkPolyDataToPolyDataFilter.h"

class VTK_EXPORT vtkFeatureEdges : public vtkPolyDataToPolyDataFilter
{
public:
  vtkTypeMacro(vtkFeatureEdges,vtkPolyDataToPolyDataFilter);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Construct object with feature angle = 30; all types of edges extracted
  // and colored.
  static vtkFeatureEdges *New();

  // Description:
  // Turn on/off the extraction of boundary edges.
  vtkSetMacro(BoundaryEdges,int);
  vtkGetMacro(BoundaryEdges,int);
  vtkBooleanMacro(BoundaryEdges,int);

  // Description:
  // Turn on/off the extraction of feature edges.
  vtkSetMacro(FeatureEdges,int);
  vtkGetMacro(FeatureEdges,int);
  vtkBooleanMacro(FeatureEdges,int);

  // Description:
  // Specify the feature angle for extracting feature edges.
  vtkSetClampMacro(FeatureAngle,float,0.0,180.0);
  vtkGetMacro(FeatureAngle,float);

  // Description:
  // Turn on/off the extraction of non-manifold edges.
  vtkSetMacro(NonManifoldEdges,int);
  vtkGetMacro(NonManifoldEdges,int);
  vtkBooleanMacro(NonManifoldEdges,int);

  // Description:
  // Turn on/off the extraction of manifold edges.
  vtkSetMacro(ManifoldEdges,int);
  vtkGetMacro(ManifoldEdges,int);
  vtkBooleanMacro(ManifoldEdges,int);

  // Description:
  // Turn on/off the coloring of edges by type.
  vtkSetMacro(Coloring,int);
  vtkGetMacro(Coloring,int);
  vtkBooleanMacro(Coloring,int);

  // Description:
  // Set / get a spatial locator for merging points. By
  // default an instance of vtkMergePoints is used.
  void SetLocator(vtkPointLocator *locator);
  vtkGetObjectMacro(Locator,vtkPointLocator);

  // Description:
  // Create default locator. Used to create one when none is specified.
  void CreateDefaultLocator();

  // Description:
  // Return MTime also considering the locator.
  unsigned long GetMTime();

protected:
  vtkFeatureEdges();
  ~vtkFeatureEdges();
  vtkFeatureEdges(const vtkFeatureEdges&) {};
  void operator=(const vtkFeatureEdges&) {};

  // Usual data generation method
  void Execute();
  void ComputeInputUpdateExtents(vtkDataObject *output);
  
  float FeatureAngle;
  int BoundaryEdges;
  int FeatureEdges;
  int NonManifoldEdges;
  int ManifoldEdges;
  int Coloring;
  vtkPointLocator *Locator;
};

#endif


