vtkAttributeClustering2DLayoutStrategy.h

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

  Program:   Visualization Toolkit
  Module:    vtkAttributeClustering2DLayoutStrategy.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 vtkAttributeClustering2DLayoutStrategy_h
#define vtkAttributeClustering2DLayoutStrategy_h

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

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

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

class VTKINFOVISLAYOUT_EXPORT vtkAttributeClustering2DLayoutStrategy : public vtkGraphLayoutStrategy
{
public:
  static vtkAttributeClustering2DLayoutStrategy* New();

  vtkTypeMacro(vtkAttributeClustering2DLayoutStrategy, vtkGraphLayoutStrategy);
  void PrintSelf(ostream& os, vtkIndent indent) override;


  vtkGetStringMacro(VertexAttribute);
  void SetVertexAttribute(const char*);


  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:
  vtkAttributeClustering2DLayoutStrategy();
  ~vtkAttributeClustering2DLayoutStrategy() override;

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

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

  int RandomSeed;
  int IterationsPerLayout;
  int TotalIterations;
  int LayoutComplete;
  float Temp;
  float RestDistance;
  float CuttingThreshold;
  char* VertexAttribute;

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

  class Internals;
  Internals* Implementation;

  vtkAttributeClustering2DLayoutStrategy(const vtkAttributeClustering2DLayoutStrategy&) = delete;
  void operator=(const vtkAttributeClustering2DLayoutStrategy&) = delete;
};

#endif