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

  Program:   Visualization Toolkit
  Module:    vtkEdgeLayoutStrategy.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 (c) Sandia Corporation
 See Copyright.txt or http://www.paraview.org/HTML/Copyright.html for details.
----------------------------------------------------------------------------*/
// .NAME vtkEdgeLayoutStrategy - abstract superclass for all edge layout strategies
//
// .SECTION Description
// All edge layouts should subclass from this class.  vtkEdgeLayoutStrategy
// works as a plug-in to the vtkEdgeLayout algorithm.

#ifndef __vtkEdgeLayoutStrategy_h
#define __vtkEdgeLayoutStrategy_h

#include "vtkObject.h"

class vtkGraph;

class VTK_INFOVIS_EXPORT vtkEdgeLayoutStrategy : public vtkObject 
{
public:
  vtkTypeMacro(vtkEdgeLayoutStrategy,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Setting the graph for the layout strategy
  virtual void SetGraph(vtkGraph *graph);
  
  // Description:
  // This method allows the layout strategy to
  // do initialization of data structures
  // or whatever else it might want to do. 
  virtual void Initialize() {};
  
  // Description:
  // This is the layout method where the graph that was
  // set in SetGraph() is laid out.
  virtual void Layout()=0;
  
  // Description:
  // Set/Get the field to use for the edge weights.
  vtkSetStringMacro(EdgeWeightArrayName);
  vtkGetStringMacro(EdgeWeightArrayName);

protected:
  vtkEdgeLayoutStrategy();
  ~vtkEdgeLayoutStrategy();
  
  vtkGraph *Graph;
  char     *EdgeWeightArrayName;

private:

  vtkEdgeLayoutStrategy(const vtkEdgeLayoutStrategy&);  // Not implemented.
  void operator=(const vtkEdgeLayoutStrategy&);  // Not implemented.
};

#endif