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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkExtractVOI.h,v $
  Language:  C++
  Date:      $Date: 2000/12/10 20:08:37 $
  Version:   $Revision: 1.24 $


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,
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   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.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
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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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=========================================================================*/
// .NAME vtkExtractVOI - select piece (e.g., volume of interest) and/or subsample structured points dataset

// .SECTION Description
// vtkExtractVOI is a filter that selects a portion of an input structured
// points 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 points 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 slice from a volume
// for image processing, subsampling large volumes to reduce data size, or
// extracting regions of a volume with interesting data.

// .SECTION See Also
// vtkGeometryFilter vtkExtractGeometry vtkExtractGrid

#ifndef __vtkExtractVOI_h
#define __vtkExtractVOI_h

#include "vtkStructuredPointsToStructuredPointsFilter.h"

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

  // Description:
  // Construct object to extract all of the input data.
  static vtkExtractVOI *New();

  // Description:
  // Specify i-j-k (min,max) pairs to extract. The resulting structured points
  // dataset can be of any topological dimension (i.e., point, line, image, 
  // or volume). 
  vtkSetVector6Macro(VOI,int);
  vtkGetVectorMacro(VOI,int,6);

  // Description:
  // 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.
  vtkSetVector3Macro(SampleRate, int);
  vtkGetVectorMacro(SampleRate, int, 3);

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

  void Execute();
  void ExecuteInformation();

  int VOI[6];
  int SampleRate[3];
};

#endif