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

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

  Copyright (c) 1993-2002 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.

=========================================================================*/
// .NAME vtkImageConnector - Create a binary image of a sphere.
// .SECTION Description
// vtkImageConnector is a helper class for connectivity filters.  
// It is not meant to be used directly.
// It implements a stack and breadth first search necessary for
// some connectivity filters.  Filtered axes sets the dimensionality 
// of the neighbor comparison, and
// cannot be more than three dimensions.  
// As implemented, only voxels which share faces are considered
// neighbors. 


#ifndef __vtkImageConnector_h
#define __vtkImageConnector_h

#include "vtkObject.h"
#include "vtkImageData.h"

//
// Special classes for manipulating data
//
//BTX - begin tcl exclude
//
// For the breadth first search
class vtkImageConnectorSeed { //;prevent man page generation
public:
  static vtkImageConnectorSeed *New() { return new vtkImageConnectorSeed;}
  void *Pointer;
  int  Index[3];
  vtkImageConnectorSeed *Next;
};
//ETX - end tcl exclude
//


class VTK_IMAGING_EXPORT vtkImageConnector : public vtkObject
{
public:
  static vtkImageConnector *New();

  vtkTypeRevisionMacro(vtkImageConnector,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  //BTX
  vtkImageConnectorSeed *NewSeed(int index[3], void *ptr);
  void AddSeed(vtkImageConnectorSeed *seed);
  void AddSeedToEnd(vtkImageConnectorSeed *seed);
  //ETX
  void RemoveAllSeeds();

  // Description:
  // Values used by the MarkRegion method
  vtkSetMacro(ConnectedValue, unsigned char); 
  vtkGetMacro(ConnectedValue, unsigned char);
  vtkSetMacro(UnconnectedValue, unsigned char);
  vtkGetMacro(UnconnectedValue, unsigned char);


  // Description:
  // Input a data of 0's and "UnconnectedValue"s. Seeds of this object are
  // used to find connected pixels.  All pixels connected to seeds are set to
  // ConnectedValue.  The data has to be unsigned char.
  void MarkData(vtkImageData *data, int dimensionality, int ext[6]);


protected:
  vtkImageConnector();
  ~vtkImageConnector();

  unsigned char ConnectedValue;
  unsigned char UnconnectedValue;

  vtkImageConnectorSeed *PopSeed();

  vtkImageConnectorSeed *Seeds;
  vtkImageConnectorSeed *LastSeed;
private:
  vtkImageConnector(const vtkImageConnector&);  // Not implemented.
  void operator=(const vtkImageConnector&);  // Not implemented.
};



#endif

  
