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

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


Copyright (c) 1993-2000 Ken Martin, Will Schroeder, Bill Lorensen 
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=========================================================================*/
// .NAME vtkExtractGeometry - extract cells that lie either entirely inside or outside of a specified implicit function

// .SECTION Description
// vtkExtractGeometry extracts from its input dataset all cells that are either
// completely inside or outside of a specified implicit function. Any type of
// dataset can be input to this filter. On output the filter generates an
// unstructured grid.

// .SECTION See Also
// vtkGeometryFilter vtkExtractVOI

#ifndef __vtkExtractGeometry_h
#define __vtkExtractGeometry_h

#include "vtkDataSetToUnstructuredGridFilter.h"
#include "vtkImplicitFunction.h"

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

  // Description:
  // Construct object with ExtractInside turned on.
  static vtkExtractGeometry *New();

  // Description:
  // Return the MTime taking into account changes to the implicit function
  unsigned long GetMTime();

  // Description:
  // Specify the implicit function for inside/outside checks.
  vtkSetObjectMacro(ImplicitFunction,vtkImplicitFunction);
  vtkGetObjectMacro(ImplicitFunction,vtkImplicitFunction);

  // Description:
  // Boolean controls whether to extract cells that are inside of implicit 
  // function (ExtractInside == 1) or outside of implicit function 
  // (ExtractInside == 0).
  vtkSetMacro(ExtractInside,int);
  vtkGetMacro(ExtractInside,int);
  vtkBooleanMacro(ExtractInside,int);

protected:
  vtkExtractGeometry(vtkImplicitFunction *f=NULL);
  ~vtkExtractGeometry();
  vtkExtractGeometry(const vtkExtractGeometry&) {};
  void operator=(const vtkExtractGeometry&) {};

  // Usual data generation method
  void Execute();

  vtkImplicitFunction *ImplicitFunction;
  int ExtractInside;
};

#endif


