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vtkBoostKruskalMinimumSpanningTree.cxx
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vtkBoostKruskalMinimumSpanningTree.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkBoostKruskalMinimumSpanningTree.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 "vtkBoostKruskalMinimumSpanningTree.h"
#include "vtkBoostGraphAdapter.h"
#include "vtkCellArray.h"
#include "vtkCellData.h"
#include "vtkMath.h"
#include "vtkIdTypeArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
#include "vtkFloatArray.h"
#include "vtkDataArray.h"
#include "vtkSelection.h"
#include "vtkSelectionNode.h"
#include "vtkSmartPointer.h"
#include "vtkStringArray.h"
#include "vtkMutableDirectedGraph.h"
#include "vtkUndirectedGraph.h"
#include "vtkTree.h"
#include <boost/graph/kruskal_min_spanning_tree.hpp>
#include <boost/pending/queue.hpp>
using namespace boost;
vtkStandardNewMacro(vtkBoostKruskalMinimumSpanningTree);
// Constructor/Destructor
vtkBoostKruskalMinimumSpanningTree::vtkBoostKruskalMinimumSpanningTree()
{
this->EdgeWeightArrayName = 0;
this->OutputSelectionType = 0;
this->SetOutputSelectionType("MINIMUM_SPANNING_TREE_EDGES");
this->NegateEdgeWeights = false;
this->EdgeWeightMultiplier = 1;
}
vtkBoostKruskalMinimumSpanningTree::~vtkBoostKruskalMinimumSpanningTree()
{
this->SetEdgeWeightArrayName(0);
}
void vtkBoostKruskalMinimumSpanningTree::SetNegateEdgeWeights(bool value)
{
this->NegateEdgeWeights = value;
if (this->NegateEdgeWeights)
this->EdgeWeightMultiplier = -1.0;
else
this->EdgeWeightMultiplier = 1.0;
this->Modified();
}
int vtkBoostKruskalMinimumSpanningTree::RequestData(
vtkInformation *vtkNotUsed(request),
vtkInformationVector **inputVector,
vtkInformationVector *outputVector)
{
// get the info objects
vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
vtkInformation *outInfo = outputVector->GetInformationObject(0);
// get the input and output
vtkGraph *input = vtkGraph::SafeDownCast(
inInfo->Get(vtkDataObject::DATA_OBJECT()));
vtkSelection *output = vtkSelection::SafeDownCast(
outInfo->Get(vtkDataObject::DATA_OBJECT()));
// Retrieve the edge-weight array.
if (!this->EdgeWeightArrayName)
{
vtkErrorMacro("Edge-weight array name is required");
return 0;
}
vtkDataArray* edgeWeightArray = input->GetEdgeData()->GetArray(this->EdgeWeightArrayName);
// Does the edge-weight array exist at all?
if (edgeWeightArray == nullptr)
{
vtkErrorMacro("Could not find edge-weight array named "
<< this->EdgeWeightArrayName);
return 0;
}
// Send the property map through both the multiplier and the
// helper (for edge_descriptor indexing)
typedef vtkGraphPropertyMapMultiplier<vtkDataArray*> mapMulti;
mapMulti multi(edgeWeightArray,this->EdgeWeightMultiplier);
vtkGraphEdgePropertyMapHelper<mapMulti> weight_helper(multi);
// Run the algorithm
std::vector<vtkEdgeType> mstEdges;
if (vtkDirectedGraph::SafeDownCast(input))
{
vtkDirectedGraph *g = vtkDirectedGraph::SafeDownCast(input);
kruskal_minimum_spanning_tree(g, std::back_inserter(mstEdges), weight_map(weight_helper));
}
else
{
vtkUndirectedGraph *g = vtkUndirectedGraph::SafeDownCast(input);
kruskal_minimum_spanning_tree(g, std::back_inserter(mstEdges), weight_map(weight_helper));
}
// Select the minimum spanning tree edges.
if (!strcmp(OutputSelectionType,"MINIMUM_SPANNING_TREE_EDGES"))
{
vtkIdTypeArray* ids = vtkIdTypeArray::New();
// Add the ids of each MST edge.
for (std::vector<vtkEdgeType>::iterator i = mstEdges.begin();
i != mstEdges.end(); ++i)
{
ids->InsertNextValue(i->Id);
}
vtkSmartPointer<vtkSelectionNode> node =
vtkSmartPointer<vtkSelectionNode>::New();
output->AddNode(node);
node->SetSelectionList(ids);
node->SetContentType(vtkSelectionNode::INDICES);
node->SetFieldType(vtkSelectionNode::EDGE);
ids->Delete();
}
return 1;
}
//----------------------------------------------------------------------------
int vtkBoostKruskalMinimumSpanningTree::FillInputPortInformation(
int port, vtkInformation* info)
{
// now add our info
if (port == 0)
{
info->Set(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkGraph");
}
return 1;
}
//----------------------------------------------------------------------------
int vtkBoostKruskalMinimumSpanningTree::FillOutputPortInformation(
int port, vtkInformation* info)
{
// now add our info
if (port == 0)
{
info->Set(vtkDataObject::DATA_TYPE_NAME(), "vtkSelection");
}
return 1;
}
//----------------------------------------------------------------------------
void vtkBoostKruskalMinimumSpanningTree::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
os << indent << "EdgeWeightArrayName: "
<< (this->EdgeWeightArrayName ? this->EdgeWeightArrayName : "(none)")
<< endl;
os << indent << "OutputSelectionType: "
<< (this->OutputSelectionType ? this->OutputSelectionType : "(none)") << endl;
os << indent << "NegateEdgeWeights: "
<< (this->NegateEdgeWeights ? "true" : "false") << endl;
os << indent << "EdgeWeightMultiplier: " << this->EdgeWeightMultiplier << endl;
}