vtkSimple2DLayoutStrategy.h

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

  Program:   Visualization Toolkit
  Module:    vtkSimple2DLayoutStrategy.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 2008 Sandia Corporation.
  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
  the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------*/
#ifndef vtkSimple2DLayoutStrategy_h
#define vtkSimple2DLayoutStrategy_h

#include "vtkInfovisLayoutModule.h" // For export macro
#include "vtkGraphLayoutStrategy.h"

class vtkFloatArray;

class VTKINFOVISLAYOUT_EXPORT vtkSimple2DLayoutStrategy : public vtkGraphLayoutStrategy
{
public:
  static vtkSimple2DLayoutStrategy *New();

  vtkTypeMacro(vtkSimple2DLayoutStrategy, vtkGraphLayoutStrategy);
  void PrintSelf(ostream& os, vtkIndent indent);


  vtkSetClampMacro(RandomSeed, int, 0, VTK_INT_MAX);
  vtkGetMacro(RandomSeed, int);


  vtkSetClampMacro(MaxNumberOfIterations, int, 0, VTK_INT_MAX);
  vtkGetMacro(MaxNumberOfIterations, int);


  vtkSetClampMacro(IterationsPerLayout, int, 0, VTK_INT_MAX);
  vtkGetMacro(IterationsPerLayout, int);


  vtkSetClampMacro(InitialTemperature, float, 0.0, VTK_FLOAT_MAX);
  vtkGetMacro(InitialTemperature, float);


  vtkSetClampMacro(CoolDownRate, double, 0.01, VTK_DOUBLE_MAX);
  vtkGetMacro(CoolDownRate, double);


  vtkSetMacro(Jitter, bool);
  vtkGetMacro(Jitter, bool);


  vtkSetMacro(RestDistance, float);
  vtkGetMacro(RestDistance, float);

  virtual void Initialize();

  virtual void Layout();

  virtual int IsLayoutComplete() {return this->LayoutComplete;}

protected:
  vtkSimple2DLayoutStrategy();
  ~vtkSimple2DLayoutStrategy();

  int    MaxNumberOfIterations;  //Maximum number of iterations.
  float  InitialTemperature;
  float  CoolDownRate;  //Cool-down rate.  Note:  Higher # = Slower rate.

private:

  // An edge consists of two vertices joined together.
  // This struct acts as a "pointer" to those two vertices.
  typedef struct
  {
    vtkIdType from;
    vtkIdType to;
    float weight;
  } vtkLayoutEdge;

  // These are for storage of repulsion and attraction
  vtkFloatArray *RepulsionArray;
  vtkFloatArray *AttractionArray;
  vtkLayoutEdge *EdgeArray;

  int RandomSeed;
  int IterationsPerLayout;
  int TotalIterations;
  int LayoutComplete;
  float Temp;
  float RestDistance;
  bool Jitter;

  vtkSimple2DLayoutStrategy(const vtkSimple2DLayoutStrategy&) VTK_DELETE_FUNCTION;
  void operator=(const vtkSimple2DLayoutStrategy&) VTK_DELETE_FUNCTION;
};

#endif