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

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


Copyright (c) 1993-2000 Ken Martin, Will Schroeder, Bill Lorensen 
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=========================================================================*/
// .NAME vtkRectilinearGridGeometryFilter - extract geometry for a rectilinear grid
// .SECTION Description
// vtkRectilinearGridGeometryFilter is a filter that extracts geometry from a
// rectilinear grid. By specifying appropriate i-j-k indices, it is possible
// to extract a point, a curve, a surface, or a "volume". The volume
// is actually a (n x m x o) region of points.
//
// The extent specification is zero-offset. That is, the first k-plane in
// a 50x50x50 rectilinear grid is given by (0,49, 0,49, 0,0).

// .SECTION Caveats
// If you don't know the dimensions of the input dataset, you can use a large
// number to specify extent (the number will be clamped appropriately). For 
// example, if the dataset dimensions are 50x50x50, and you want a the fifth 
// k-plane, you can use the extents (0,100, 0,100, 4,4). The 100 will 
// automatically be clamped to 49.

// .SECTION See Also
// vtkGeometryFilter vtkExtractGrid

#ifndef __vtkRectilinearGridGeometryFilter_h
#define __vtkRectilinearGridGeometryFilter_h

#include "vtkRectilinearGridToPolyDataFilter.h"

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

  // Description:
  // Construct with initial extent (0,100, 0,100, 0,0) (i.e., a k-plane).
  static vtkRectilinearGridGeometryFilter *New();

  // Description:
  // Get the extent in topological coordinate range (imin,imax, jmin,jmax,
  // kmin,kmax).
  vtkGetVectorMacro(Extent,int,6);

  // Description:
  // Specify (imin,imax, jmin,jmax, kmin,kmax) indices.
  void SetExtent(int iMin, int iMax, int jMin, int jMax, int kMin, int kMax);

  // Description:
  // Specify (imin,imax, jmin,jmax, kmin,kmax) indices in array form.
  void SetExtent(int *extent);

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

  void Execute();
  int Extent[6];
};

#endif


