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

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


Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

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 * 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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 * 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.

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=========================================================================*/
// .NAME vtkExtractVectorComponents - extract components of vector as separate scalars
// .SECTION Description
// vtkExtractVectorComponents is a filter that extracts vector components as
// separate scalars. This is accomplished by creating three different outputs.
// Each output is the same as the input, except that the scalar values will be
// one of the three components of the vector. These can be found in the
// VxComponent, VyComponent, and VzComponent.

// .SECTION Caveats
// This filter is unusual in that it creates multiple outputs. 
// If you use the GetOutput() method, you will be retrieving the x vector component.

#ifndef __vtkExtractVectorComponents_h
#define __vtkExtractVectorComponents_h

#include "vtkSource.h"
#include "vtkDataSet.h"

class VTK_EXPORT vtkExtractVectorComponents : public vtkSource
{
public:
  static vtkExtractVectorComponents *New();
  vtkTypeMacro(vtkExtractVectorComponents,vtkSource);

  // Description:
  // Specify the input data or filter.
  virtual void SetInput(vtkDataSet *input);

  // Description:
  // Get the input data or filter.
  vtkDataSet *GetInput();

  // Description:
  // Get the output dataset representing velocity x-component. If output is
  // NULL then input hasn't been set, which is necessary for abstract
  // objects. (Note: this method returns the same information as the
  // GetOutput() method with an index of 0.)
  vtkDataSet *GetVxComponent();

  // Description:
  // Get the output dataset representing velocity y-component. If output is
  // NULL then input hasn't been set, which is necessary for abstract
  // objects. (Note: this method returns the same information as the
  // GetOutput() method with an index of 1.)
  vtkDataSet *GetVyComponent();
  
  // Description:
  // Get the output dataset representing velocity z-component. If output is
  // NULL then input hasn't been set, which is necessary for abstract
  // objects. (Note: this method returns the same information as the
  // GetOutput() method with an index of 2.)
  vtkDataSet *GetVzComponent();

  // Description:
  // Get the output dataset containing the indicated component. The component
  // is specified by an index between (0,2) corresponding to the x, y, or z
  // vector component. By default, the x component is extracted.
  vtkDataSet *GetOutput(int i=0); //default extracts vector component.

#ifndef VTK_REMOVE_LEGACY_CODE
  // Description:
  // For legacy compatibility. Do not use.
  void SetInput(vtkDataSet &input) 
    {VTK_LEGACY_METHOD(SetInput,"3.2"); this->SetInput(&input);}
#endif
  
protected:
  vtkExtractVectorComponents();
  ~vtkExtractVectorComponents();
  vtkExtractVectorComponents(const vtkExtractVectorComponents&) {};
  void operator=(const vtkExtractVectorComponents&) {};

  void Execute();
};

#endif


