vtkClustering2DLayoutStrategy.h

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

  Program:   Visualization Toolkit
  Module:    vtkClustering2DLayoutStrategy.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 vtkClustering2DLayoutStrategy_h
#define vtkClustering2DLayoutStrategy_h

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

#include "vtkSmartPointer.h"    // Required for smart pointer internal ivars.

class vtkFastSplatter;
class vtkImageData;
class vtkIntArray;
class vtkFloatArray;

class VTKINFOVISLAYOUT_EXPORT vtkClustering2DLayoutStrategy : public vtkGraphLayoutStrategy
{
public:
  static vtkClustering2DLayoutStrategy *New();

  vtkTypeMacro(vtkClustering2DLayoutStrategy, vtkGraphLayoutStrategy);
  void PrintSelf(ostream& os, vtkIndent indent) override;


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

  void Initialize() override;

  void Layout() override;

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

protected:
  vtkClustering2DLayoutStrategy();
  ~vtkClustering2DLayoutStrategy() override;

  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;
    int dead_edge; // I'm making this an int so that the edge array is
                   // word boundary aligned... but I'm not sure what
                   // really happens in these days of magical compilers
  } vtkLayoutEdge;

  // This class 'has a' vtkFastSplatter for the density grid
  vtkSmartPointer<vtkFastSplatter>        DensityGrid;
  vtkSmartPointer<vtkImageData>           SplatImage;
  vtkSmartPointer<vtkFloatArray>          RepulsionArray;
  vtkSmartPointer<vtkFloatArray>          AttractionArray;
  vtkSmartPointer<vtkIntArray>            EdgeCountArray;

  vtkLayoutEdge *EdgeArray;

  int RandomSeed;
  int IterationsPerLayout;
  int TotalIterations;
  int LayoutComplete;
  float Temp;
  float RestDistance;
  float CuttingThreshold;

  // Private helper methods
  void GenerateCircularSplat(vtkImageData *splat, int x, int y);
  void GenerateGaussianSplat(vtkImageData *splat, int x, int y);
  void ResolveCoincidentVertices();

  vtkClustering2DLayoutStrategy(const vtkClustering2DLayoutStrategy&) = delete;
  void operator=(const vtkClustering2DLayoutStrategy&) = delete;
};

#endif