VTK  9.1.0
vtkClustering2DLayoutStrategy.h
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1 /*=========================================================================
2 
3  Program: Visualization Toolkit
4  Module: vtkClustering2DLayoutStrategy.h
5 
6  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
7  All rights reserved.
8  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
9 
10  This software is distributed WITHOUT ANY WARRANTY; without even
11  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
12  PURPOSE. See the above copyright notice for more information.
13 
14 =========================================================================*/
15 /*-------------------------------------------------------------------------
16  Copyright 2008 Sandia Corporation.
17  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
18  the U.S. Government retains certain rights in this software.
19 -------------------------------------------------------------------------*/
36 #ifndef vtkClustering2DLayoutStrategy_h
37 #define vtkClustering2DLayoutStrategy_h
38 
39 #include "vtkGraphLayoutStrategy.h"
40 #include "vtkInfovisLayoutModule.h" // For export macro
41 
42 #include "vtkSmartPointer.h" // Required for smart pointer internal ivars.
43 
44 class vtkFastSplatter;
45 class vtkImageData;
46 class vtkIntArray;
47 class vtkFloatArray;
48 
49 class VTKINFOVISLAYOUT_EXPORT vtkClustering2DLayoutStrategy : public vtkGraphLayoutStrategy
50 {
51 public:
53 
55  void PrintSelf(ostream& os, vtkIndent indent) override;
56 
58 
63  vtkSetClampMacro(RandomSeed, int, 0, VTK_INT_MAX);
64  vtkGetMacro(RandomSeed, int);
66 
68 
76  vtkSetClampMacro(MaxNumberOfIterations, int, 0, VTK_INT_MAX);
77  vtkGetMacro(MaxNumberOfIterations, int);
79 
81 
88  vtkSetClampMacro(IterationsPerLayout, int, 0, VTK_INT_MAX);
89  vtkGetMacro(IterationsPerLayout, int);
91 
93 
99  vtkSetClampMacro(InitialTemperature, float, 0.0, VTK_FLOAT_MAX);
100  vtkGetMacro(InitialTemperature, float);
102 
104 
112  vtkSetClampMacro(CoolDownRate, double, 0.01, VTK_DOUBLE_MAX);
113  vtkGetMacro(CoolDownRate, double);
115 
117 
121  vtkSetMacro(RestDistance, float);
122  vtkGetMacro(RestDistance, float);
124 
129  void Initialize() override;
130 
138  void Layout() override;
139 
144  int IsLayoutComplete() override { return this->LayoutComplete; }
145 
146 protected:
149 
150  int MaxNumberOfIterations; // Maximum number of iterations.
152  float CoolDownRate; // Cool-down rate. Note: Higher # = Slower rate.
153 
154 private:
155  // An edge consists of two vertices joined together.
156  // This struct acts as a "pointer" to those two vertices.
157  struct vtkLayoutEdge_t
158  {
159  vtkIdType from;
160  vtkIdType to;
161  float weight;
162  int dead_edge; // I'm making this an int so that the edge array is
163  // word boundary aligned... but I'm not sure what
164  // really happens in these days of magical compilers
165  };
166  using vtkLayoutEdge = struct vtkLayoutEdge_t;
167 
168  // This class 'has a' vtkFastSplatter for the density grid
171  vtkSmartPointer<vtkFloatArray> RepulsionArray;
172  vtkSmartPointer<vtkFloatArray> AttractionArray;
173  vtkSmartPointer<vtkIntArray> EdgeCountArray;
174 
175  vtkLayoutEdge* EdgeArray;
176 
177  int RandomSeed;
178  int IterationsPerLayout;
179  int TotalIterations;
180  int LayoutComplete;
181  float Temp;
182  float RestDistance;
183  float CuttingThreshold;
184 
185  // Private helper methods
186  void GenerateCircularSplat(vtkImageData* splat, int x, int y);
187  void GenerateGaussianSplat(vtkImageData* splat, int x, int y);
188  void ResolveCoincidentVertices();
189 
191  void operator=(const vtkClustering2DLayoutStrategy&) = delete;
192 };
193 
194 #endif
~vtkClustering2DLayoutStrategy() override
void Initialize() override
This strategy sets up some data structures for faster processing of each Layout() call.
void PrintSelf(ostream &os, vtkIndent indent) override
Methods invoked by print to print information about the object including superclasses.
void Layout() override
This is the layout method where the graph that was set in SetGraph() is laid out.
static vtkClustering2DLayoutStrategy * New()
int IsLayoutComplete() override
I'm an iterative layout so this method lets the caller know if I'm done laying out the graph.
A splatter optimized for splatting single kernels.
dynamic, self-adjusting array of float
Definition: vtkFloatArray.h:36
abstract superclass for all graph layout strategies
topologically and geometrically regular array of data
Definition: vtkImageData.h:48
a simple class to control print indentation
Definition: vtkIndent.h:34
dynamic, self-adjusting array of int
Definition: vtkIntArray.h:40
@ weight
Definition: vtkX3D.h:538
int vtkIdType
Definition: vtkType.h:332
#define VTK_DOUBLE_MAX
Definition: vtkType.h:165
#define VTK_INT_MAX
Definition: vtkType.h:155
#define VTK_FLOAT_MAX
Definition: vtkType.h:163