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/*=========================================================================
Program: Visualization Toolkit
Module: vtkRemoveIsolatedVertices.cxx
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.
-------------------------------------------------------------------------*/
#include "vtkRemoveIsolatedVertices.h"
#include "vtkDataSetAttributes.h"
#include "vtkEdgeListIterator.h"
#include "vtkGraph.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkMutableDirectedGraph.h"
#include "vtkMutableGraphHelper.h"
#include "vtkMutableUndirectedGraph.h"
#include "vtkObjectFactory.h"
#include "vtkPoints.h"
#include "vtkSmartPointer.h"
#include <vector>
vtkStandardNewMacro(vtkRemoveIsolatedVertices);
//----------------------------------------------------------------------------
vtkRemoveIsolatedVertices::vtkRemoveIsolatedVertices()
{
}
//----------------------------------------------------------------------------
vtkRemoveIsolatedVertices::~vtkRemoveIsolatedVertices()
{
}
//----------------------------------------------------------------------------
int vtkRemoveIsolatedVertices::RequestData(
vtkInformation* vtkNotUsed(request),
vtkInformationVector** inputVector,
vtkInformationVector* outputVector)
{
vtkGraph* input = vtkGraph::GetData(inputVector[0]);
// Set up our mutable graph helper.
vtkSmartPointer<vtkMutableGraphHelper> builder =
vtkSmartPointer<vtkMutableGraphHelper>::New();
if (vtkDirectedGraph::SafeDownCast(input))
{
vtkSmartPointer<vtkMutableDirectedGraph> dir =
vtkSmartPointer<vtkMutableDirectedGraph>::New();
builder->SetGraph(dir);
}
else
{
vtkSmartPointer<vtkMutableUndirectedGraph> undir =
vtkSmartPointer<vtkMutableUndirectedGraph>::New();
builder->SetGraph(undir);
}
// Initialize edge data, vertex data, and points.
vtkDataSetAttributes *inputEdgeData = input->GetEdgeData();
vtkDataSetAttributes *builderEdgeData = builder->GetGraph()->GetEdgeData();
builderEdgeData->CopyAllocate(inputEdgeData);
vtkDataSetAttributes *inputVertData = input->GetVertexData();
vtkDataSetAttributes *builderVertData = builder->GetGraph()->GetVertexData();
builderVertData->CopyAllocate(inputVertData);
vtkPoints* inputPoints = input->GetPoints();
vtkSmartPointer<vtkPoints> builderPoints = vtkSmartPointer<vtkPoints>::New();
builder->GetGraph()->SetPoints(builderPoints);
// Vector keeps track of mapping of input vertex ids to
// output vertex ids.
vtkIdType numVert = input->GetNumberOfVertices();
std::vector<int> outputVertex(numVert, -1);
vtkSmartPointer<vtkEdgeListIterator> edgeIter =
vtkSmartPointer<vtkEdgeListIterator>::New();
input->GetEdges(edgeIter);
while (edgeIter->HasNext())
{
vtkEdgeType e = edgeIter->Next();
vtkIdType source = outputVertex[e.Source];
if (source < 0)
{
source = builder->AddVertex();
outputVertex[e.Source] = source;
builderVertData->CopyData(inputVertData, e.Source, source);
builderPoints->InsertNextPoint(inputPoints->GetPoint(e.Source));
}
vtkIdType target = outputVertex[e.Target];
if (target < 0)
{
target = builder->AddVertex();
outputVertex[e.Target] = target;
builderVertData->CopyData(inputVertData, e.Target, target);
builderPoints->InsertNextPoint(inputPoints->GetPoint(e.Target));
}
vtkEdgeType outputEdge = builder->AddEdge(source, target);
builderEdgeData->CopyData(inputEdgeData, e.Id, outputEdge.Id);
}
// Pass constructed graph to output.
vtkGraph* output = vtkGraph::GetData(outputVector);
output->ShallowCopy(builder->GetGraph());
output->GetFieldData()->PassData(input->GetFieldData());
// Clean up
output->Squeeze();
return 1;
}
//----------------------------------------------------------------------------
void vtkRemoveIsolatedVertices::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
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