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vtkCollapseGraph.h
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vtkCollapseGraph.h
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkCollapseGraph.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 (c) Sandia Corporation
See Copyright.txt or http://www.paraview.org/HTML/Copyright.html for details.
----------------------------------------------------------------------------*/
/**
* @class vtkCollapseGraph
* @brief "Collapses" vertices onto their neighbors.
*
*
* vtkCollapseGraph "collapses" vertices onto their neighbors, while maintaining
* connectivity. Two inputs are required - a graph (directed or undirected),
* and a vertex selection that can be converted to indices.
*
* Conceptually, each of the vertices specified in the input selection
* expands, "swallowing" adacent vertices. Edges to-or-from the "swallowed"
* vertices become edges to-or-from the expanding vertices, maintaining the
* overall graph connectivity.
*
* In the case of directed graphs, expanding vertices only swallow vertices that
* are connected via out edges. This rule provides intuitive behavior when
* working with trees, so that "child" vertices collapse into their parents
* when the parents are part of the input selection.
*
* Input port 0: graph
* Input port 1: selection
*/
#ifndef vtkCollapseGraph_h
#define vtkCollapseGraph_h
#include "vtkInfovisCoreModule.h" // For export macro
#include "vtkGraphAlgorithm.h"
class VTKINFOVISCORE_EXPORT vtkCollapseGraph : public vtkGraphAlgorithm
{
public:
static vtkCollapseGraph* New();
vtkTypeMacro(vtkCollapseGraph,vtkGraphAlgorithm);
void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;
/// Convenience function provided for setting the graph input.
void SetGraphConnection(vtkAlgorithmOutput*);
/// Convenience function provided for setting the selection input.
void SetSelectionConnection(vtkAlgorithmOutput*);
protected:
vtkCollapseGraph();
~vtkCollapseGraph() VTK_OVERRIDE;
int FillInputPortInformation(int port, vtkInformation* info) VTK_OVERRIDE;
int RequestData(
vtkInformation*,
vtkInformationVector**,
vtkInformationVector*) VTK_OVERRIDE;
private:
vtkCollapseGraph(const vtkCollapseGraph&) VTK_DELETE_FUNCTION;
void operator=(const vtkCollapseGraph&) VTK_DELETE_FUNCTION;
};
#endif