vtkExtractGrid.h 4.3 KB
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/*=========================================================================

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  Program:   Visualization Toolkit
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  Module:    vtkExtractGrid.h
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  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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     PURPOSE.  See the above copyright notice for more information.
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=========================================================================*/
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/**
 * @class   vtkExtractGrid
 * @brief   select piece (e.g., volume of interest) and/or subsample structured grid dataset
 *
 *
 * vtkExtractGrid is a filter that selects a portion of an input structured
 * grid dataset, or subsamples an input dataset. (The selected portion of
 * interested is referred to as the Volume Of Interest, or VOI.) The output of
 * this filter is a structured grid dataset. The filter treats input data of
 * any topological dimension (i.e., point, line, image, or volume) and can
 * generate output data of any topological dimension.
 *
 * To use this filter set the VOI ivar which are i-j-k min/max indices that
 * specify a rectangular region in the data. (Note that these are 0-offset.)
 * You can also specify a sampling rate to subsample the data.
 *
 * Typical applications of this filter are to extract a plane from a grid for
 * contouring, subsampling large grids to reduce data size, or extracting
 * regions of a grid with interesting data.
 *
 * @sa
 * vtkGeometryFilter vtkExtractGeometry vtkExtractVOI
 * vtkStructuredGridGeometryFilter
*/
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#ifndef vtkExtractGrid_h
#define vtkExtractGrid_h
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#include "vtkFiltersExtractionModule.h" // For export macro
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#include "vtkStructuredGridAlgorithm.h"
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// Forward Declarations
class vtkExtractStructuredGridHelper;

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class VTKFILTERSEXTRACTION_EXPORT vtkExtractGrid : public vtkStructuredGridAlgorithm
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{
public:
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  static vtkExtractGrid *New();
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  vtkTypeMacro(vtkExtractGrid,vtkStructuredGridAlgorithm);
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  void PrintSelf(ostream& os, vtkIndent indent) override;
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  //@{
  /**
   * Specify i-j-k (min,max) pairs to extract. The resulting structured grid
   * dataset can be of any topological dimension (i.e., point, line, plane,
   * or 3D grid).
   */
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  vtkSetVector6Macro(VOI,int);
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  vtkGetVectorMacro(VOI,int,6);
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  //@}

  //@{
  /**
   * Set the sampling rate in the i, j, and k directions. If the rate is > 1,
   * then the resulting VOI will be subsampled representation of the input.
   * For example, if the SampleRate=(2,2,2), every other point will be
   * selected, resulting in a volume 1/8th the original size.
   * Initial value is (1,1,1).
   */
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  vtkSetVector3Macro(SampleRate, int);
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  vtkGetVectorMacro(SampleRate, int, 3);
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  //@}

  //@{
  /**
   * Control whether to enforce that the "boundary" of the grid is output in
   * the subsampling process. (This ivar only has effect when the SampleRate
   * in any direction is not equal to 1.) When this ivar IncludeBoundary is
   * on, the subsampling will always include the boundary of the grid even
   * though the sample rate is not an even multiple of the grid
   * dimensions. (By default IncludeBoundary is off.)
   */
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  vtkSetMacro(IncludeBoundary,vtkTypeBool);
  vtkGetMacro(IncludeBoundary,vtkTypeBool);
  vtkBooleanMacro(IncludeBoundary,vtkTypeBool);
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  //@}
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protected:
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  vtkExtractGrid();
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  ~vtkExtractGrid() override;
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  int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *) override;
  int RequestInformation(vtkInformation *, vtkInformationVector **, vtkInformationVector *) override;
  int RequestUpdateExtent(vtkInformation *, vtkInformationVector **, vtkInformationVector *) override;
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  /**
   * Implementation for RequestData using a specified VOI. This is because the
   * parallel filter needs to muck around with the VOI to get spacing and
   * partitioning to play nice. The VOI is calculated from the output
   * data object's extents in this implementation.
   */
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  bool RequestDataImpl(vtkInformationVector **inputVector,
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                       vtkInformationVector *outputVector);


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  int VOI[6];
  int SampleRate[3];
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  vtkTypeBool IncludeBoundary;
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  vtkExtractStructuredGridHelper* Internal;

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private:
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  vtkExtractGrid(const vtkExtractGrid&) = delete;
  void operator=(const vtkExtractGrid&) = delete;
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};

#endif