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

  Program:   Visualization Toolkit
  Module:    vtkPExtractHistogram2D.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
/*-------------------------------------------------------------------------
  Copyright 2009 Sandia Corporation.
  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
  the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------*/
// .NAME vtkPExtractHistogram2D - compute a 2D histogram between two columns
//  of an input vtkTable in parallel.
//
// .SECTION Description
//  This class does exactly the same this as vtkExtractHistogram2D,
//  but does it in a multi-process environment.  After each node
//  computes their own local histograms, this class does an AllReduce
//  that distributes the sum of all local histograms onto each node.
//
// .SECTION See Also
//  vtkExtractHistogram2D
// 
// .SECTION Thanks
//  Developed by David Feng and Philippe Pebay at Sandia National Laboratories
//------------------------------------------------------------------------------
#ifndef __vtkPExtractHistogram2D_h
#define __vtkPExtractHistogram2D_h

#include "vtkExtractHistogram2D.h"

class vtkMultiBlockDataSet;
class vtkMultiProcessController;

class VTK_INFOVIS_EXPORT vtkPExtractHistogram2D : public vtkExtractHistogram2D
{
public:
  static vtkPExtractHistogram2D* New();
  vtkTypeMacro(vtkPExtractHistogram2D, vtkExtractHistogram2D);
  void PrintSelf(ostream& os, vtkIndent indent);

  virtual void SetController(vtkMultiProcessController*);
  vtkGetObjectMacro(Controller,vtkMultiProcessController);

protected:
  vtkPExtractHistogram2D();
  ~vtkPExtractHistogram2D();

  vtkMultiProcessController* Controller;

  virtual int ComputeBinExtents(vtkDataArray* col1, vtkDataArray* col2);

  // Execute the calculations required by the Learn option.
  virtual void Learn( vtkTable* inData,
                      vtkTable* inParameters,
                      vtkMultiBlockDataSet* outMeta );

private:
  vtkPExtractHistogram2D(const vtkPExtractHistogram2D&); // Not implemented
  void operator=(const vtkPExtractHistogram2D&);   // Not implemented
};

#endif
