vtkCommunity2DLayoutStrategy.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-FileCopyrightText: Copyright 2008 Sandia Corporation
// SPDX-License-Identifier: LicenseRef-BSD-3-Clause-Sandia-USGov
 
#ifndef vtkCommunity2DLayoutStrategy_h
#define vtkCommunity2DLayoutStrategy_h
 
#include "vtkGraphLayoutStrategy.h"
#include "vtkInfovisLayoutModule.h" // For export macro
 
#include "vtkSmartPointer.h" // Required for smart pointer internal ivars.
 
VTK_ABI_NAMESPACE_BEGIN
class vtkFastSplatter;
class vtkImageData;
class vtkFloatArray;
 
class VTKINFOVISLAYOUT_EXPORT vtkCommunity2DLayoutStrategy : public vtkGraphLayoutStrategy
{
public:
  static vtkCommunity2DLayoutStrategy* New();
 
  vtkTypeMacro(vtkCommunity2DLayoutStrategy, 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; }


  vtkGetStringMacro(CommunityArrayName);
  vtkSetStringMacro(CommunityArrayName);


  vtkSetClampMacro(CommunityStrength, float, 0.1, 1.0);
  vtkGetMacro(CommunityStrength, float);
 
protected:
  vtkCommunity2DLayoutStrategy();
  ~vtkCommunity2DLayoutStrategy() 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.
  struct vtkLayoutEdge_t
  {
    vtkIdType from;
    vtkIdType to;
    float weight;
  };
  using vtkLayoutEdge = struct vtkLayoutEdge_t;
 
  // This class 'has a' vtkFastSplatter for the density grid
  vtkSmartPointer<vtkFastSplatter> DensityGrid;
  vtkSmartPointer<vtkImageData> SplatImage;
  vtkSmartPointer<vtkFloatArray> RepulsionArray;
  vtkSmartPointer<vtkFloatArray> AttractionArray;
 
  vtkLayoutEdge* EdgeArray;
 
  int RandomSeed;
  int IterationsPerLayout;
  int TotalIterations;
  int LayoutComplete;
  float Temp;
  float RestDistance;
  float CommunityStrength;

  char* CommunityArrayName;
 
  // Private helper methods
  void GenerateCircularSplat(vtkImageData* splat, int x, int y);
  void GenerateGaussianSplat(vtkImageData* splat, int x, int y);
  void ResolveCoincidentVertices();
 
  vtkCommunity2DLayoutStrategy(const vtkCommunity2DLayoutStrategy&) = delete;
  void operator=(const vtkCommunity2DLayoutStrategy&) = delete;
};
 
VTK_ABI_NAMESPACE_END
#endif