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vtkReebGraphToJoinSplitTreeFilter.cxx
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vtkReebGraphToJoinSplitTreeFilter.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkReebGraphToJoinSplitTreeFilter.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.
=========================================================================*/
#include "vtkReebGraphToJoinSplitTreeFilter.h"
#include "vtkDataSetAttributes.h"
#include "vtkEdgeListIterator.h"
#include "vtkIdTypeArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPointSet.h"
#include "vtkReebGraph.h"
#include "vtkVariantArray.h"
#include <algorithm>
#include <boost/pending/disjoint_sets.hpp>
namespace
{
//----------------------------------------------------------------------------
inline static bool vtkReebGraphVertexSoS(const std::pair<int, double>& v0,
const std::pair<int, double>& v1)
{
return ((v0.second < v1.second)
|| ((v0.second == v1.second)&&(v0.first < v1.first)));
}
}
vtkStandardNewMacro(vtkReebGraphToJoinSplitTreeFilter);
//----------------------------------------------------------------------------
vtkReebGraphToJoinSplitTreeFilter::vtkReebGraphToJoinSplitTreeFilter()
{
this->SetNumberOfInputPorts(2);
this->IsSplitTree = false;
this->FieldId = 0;
}
//----------------------------------------------------------------------------
vtkReebGraphToJoinSplitTreeFilter::~vtkReebGraphToJoinSplitTreeFilter()
{
}
//----------------------------------------------------------------------------
int vtkReebGraphToJoinSplitTreeFilter::FillInputPortInformation(
int portNumber, vtkInformation *info)
{
switch(portNumber)
{
case 0:
info->Remove(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE());
info->Append(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkPointSet");
break;
case 1:
info->Remove(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE());
info->Append(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkReebGraph");
break;
}
return 1;
}
//----------------------------------------------------------------------------
int vtkReebGraphToJoinSplitTreeFilter::FillOutputPortInformation(
int, vtkInformation *info)
{
info->Set(vtkDirectedGraph::DATA_TYPE_NAME(), "vtkReebGraph");
return 1;
}
//----------------------------------------------------------------------------
void vtkReebGraphToJoinSplitTreeFilter::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Is Split Tree: " << this->IsSplitTree << "\n";
os << indent << "Field Id: " << this->FieldId << "\n";
}
//----------------------------------------------------------------------------
vtkReebGraph* vtkReebGraphToJoinSplitTreeFilter::GetOutput()
{
return vtkReebGraph::SafeDownCast(this->GetOutputDataObject(0));
}
//----------------------------------------------------------------------------
int vtkReebGraphToJoinSplitTreeFilter::RequestData(vtkInformation* vtkNotUsed(request), vtkInformationVector **inputVector, vtkInformationVector *outputVector)
{
vtkInformation *inInfoMesh = inputVector[0]->GetInformationObject(0),
*inInfoGraph = inputVector[1]->GetInformationObject(0);
if((!inInfoMesh)||(!inInfoGraph))
return 0;
vtkPointSet *inputMesh = vtkPointSet::SafeDownCast(
inInfoMesh->Get(vtkPointSet::DATA_OBJECT()));
vtkReebGraph *inputGraph = vtkReebGraph::SafeDownCast(
inInfoGraph->Get(vtkReebGraph::DATA_OBJECT()));
if((inputMesh)&&(inputGraph))
{
vtkInformation *outInfo = outputVector->GetInformationObject(0);
vtkReebGraph *output = vtkReebGraph::SafeDownCast(
outInfo->Get(vtkReebGraph::DATA_OBJECT()));
if(output)
{
output->DeepCopy(inputGraph);
// Retrieve the information regarding the critical nodes
vtkDataArray *vertexInfo = vtkArrayDownCast<vtkDataArray>(
inputGraph->GetVertexData()->GetAbstractArray("Vertex Ids"));
if(!vertexInfo)
// invalid Reeb graph (no information associated to the vertices)
return 0;
vtkVariantArray *edgeInfo = vtkArrayDownCast<vtkVariantArray>(
inputGraph->GetEdgeData()->GetAbstractArray("Vertex Ids"));
if(!edgeInfo)
// invalid Reeb graph (no information associated to the edges)
return 0;
vtkDataArray *scalarField = inputMesh->GetPointData()->GetArray(FieldId);
if(!scalarField)
// invalid input mesh (no scalar field associated to it)
return 0;
// first, uncompress the input Reeb graph.
vtkMutableDirectedGraph *unCompressedGraph = vtkMutableDirectedGraph::New();
std::vector<std::pair<int, double> > vertexList;
for(int i = 0; i < vertexInfo->GetNumberOfTuples(); i++)
{
int vertexId = (int) *(vertexInfo->GetTuple(i));
double scalarValue = scalarField->GetComponent(vertexId, 0);
vertexList.push_back(std::pair<int, double>(vertexId, scalarValue));
}
vtkEdgeListIterator *eIt = vtkEdgeListIterator::New();
inputGraph->GetEdges(eIt);
do{
vtkEdgeType e = eIt->Next();
vtkAbstractArray *deg2NodeList = edgeInfo->GetPointer(e.Id)->ToArray();
for(int i = 0; i < deg2NodeList->GetNumberOfTuples(); i++)
{
int vertexId = deg2NodeList->GetVariantValue(i).ToInt();
double scalarValue = scalarField->GetComponent(vertexId, 0);
vertexList.push_back(std::pair<int, double>(vertexId, scalarValue));
}
}while(eIt->HasNext());
eIt->Delete();
std::vector<int> vertexToNodeMap(vertexList.size());
// create the nodes
vtkVariantArray *vertexProperties = vtkVariantArray::New();
vertexProperties->SetNumberOfValues(1);
vtkIdTypeArray *vertexIds = vtkIdTypeArray::New();
vertexIds->SetName("Vertex Ids");
unCompressedGraph->GetVertexData()->AddArray(vertexIds);
for(unsigned int i = 0; i < vertexList.size(); i++)
{
vertexProperties->SetValue(0, vertexList[i].first);
unCompressedGraph->AddVertex(vertexProperties);
vertexToNodeMap[vertexList[i].first] = i;
}
vertexIds->Delete();
vertexProperties->Delete();
eIt = vtkEdgeListIterator::New();
inputGraph->GetEdges(eIt);
do{
vtkEdgeType e = eIt->Next();
int sourceVertexId = (int) *(vertexInfo->GetTuple(e.Source)),
targetVertexId = (int) *(vertexInfo->GetTuple(e.Target));
vtkAbstractArray *deg2NodeList = edgeInfo->GetPointer(e.Id)->ToArray();
if(!deg2NodeList->GetNumberOfTuples())
{
// empty arc
unCompressedGraph->AddEdge(vertexToNodeMap[sourceVertexId],
vertexToNodeMap[targetVertexId]);
}
else
{
unCompressedGraph->AddEdge(vertexToNodeMap[sourceVertexId],
vertexToNodeMap[deg2NodeList->GetVariantValue(0).ToInt()]);
for(int i = 1; i < deg2NodeList->GetNumberOfTuples(); i++)
{
unCompressedGraph->AddEdge(
vertexToNodeMap[deg2NodeList->GetVariantValue(i - 1).ToInt()],
vertexToNodeMap[deg2NodeList->GetVariantValue(i).ToInt()]);
}
unCompressedGraph->AddEdge(
vertexToNodeMap[deg2NodeList->GetVariantValue(
deg2NodeList->GetNumberOfTuples() - 1).ToInt()],
vertexToNodeMap[targetVertexId]);
}
}while(eIt->HasNext());
eIt->Delete();
// input graph uncompressed.
// now the actual join/split tree algorithm.
// sort the vertices, by increasing order for join trees and
// decreasing order for split trees.
std::sort(vertexList.begin(), vertexList.end(), vtkReebGraphVertexSoS);
if(IsSplitTree)
{
// reverse the list of vertices
std::vector<std::pair<int, double> > tmpVector(vertexList);
for(int i = static_cast<int>(tmpVector.size()) - 1; i >= 0; i--)
{
vertexList[vertexList.size() - i - 1] = tmpVector[i];
}
}
// then, prepare the necessary adjacency information
std::vector<std::vector<int> >
halfStars(vertexList.size());
vertexInfo = vtkArrayDownCast<vtkDataArray>(
unCompressedGraph->GetVertexData()->GetAbstractArray("Vertex Ids"));
eIt = vtkEdgeListIterator::New();
unCompressedGraph->GetEdges(eIt);
do
{
vtkEdgeType e = eIt->Next();
int sourceId = (vtkIdType) *(vertexInfo->GetTuple(e.Source)),
targetId = (vtkIdType) *(vertexInfo->GetTuple(e.Target));
if(!IsSplitTree)
halfStars[targetId].push_back(sourceId);
else halfStars[sourceId].push_back(targetId);
}while(eIt->HasNext());
eIt->Delete();
// at this point, we don't need the unCompressedGraph anymore now that we
// have the halfStars correctly built.
unCompressedGraph->Delete();
// prepare the intermediate data-structure
std::vector<std::pair<std::pair<int, int>, std::vector<int> > >
edgeList(vertexList.size());
for(unsigned int i = 0; i < edgeList.size(); i++)
{
edgeList[i].first.first = -1;
edgeList[i].first.second = -1;
}
// prepare the unionFind
std::vector<int> rank(vertexList.size());
std::vector<int> parent(vertexList.size());
boost::disjoint_sets<int *, int *> unionFind(&rank[0], &parent[0]);
// enables a compressed usage of the UF
std::vector<int> vertexToUFQueryMap(vertexList.size());
int representative=0;
// we don't parse the last vertex, for sure it's gonna be the
// global "max".
for(unsigned int i = 0; i < vertexList.size() - 1; i++)
{
if(halfStars[vertexList[i].first].empty())
{
// this is leaf (either a min or a max)
unionFind.make_set(vertexList[i].first);
vertexToUFQueryMap[vertexList[i].first] = vertexList[i].first;
representative = unionFind.find_set(vertexList[i].first);
edgeList[representative].first.first = vertexList[i].first;
}
else
{
std::vector<int> representatives;
// this is not a leaf node.
// let's collect the unionFind representatives
for(unsigned int j = 0; j < halfStars[vertexList[i].first].size(); j++)
{
representative = unionFind.find_set(
vertexToUFQueryMap[halfStars[vertexList[i].first][j]]);
// add it to the representative list
bool isAlreadyStored = false;
for(unsigned int k = 0;
((k < representatives.size())&&(!isAlreadyStored)); k++)
{
// 95% of time this will loop only once (depending on the field
// complexity).
//
// if there is a non-degenerate (index 3) merge. it will loop
// twice.
//
// High-index degenerate merge have a very very low probability of
// appearance which is roughly inversely proportionnal to way more
// than its index.
if(representatives[k] == representative)
{
isAlreadyStored = true;
}
}
if(!isAlreadyStored) representatives.push_back(representative);
}
if(representatives.size() == 1)
{
// add a deg2 node
edgeList[representative].second.push_back(vertexList[i].first);
// propagate the vertexId to be used to query the UF.
vertexToUFQueryMap[vertexList[i].first] =
vertexToUFQueryMap[halfStars[vertexList[i].first][
halfStars[vertexList[i].first].size() - 1]];
}
else
{
// close the incoming edges
for(unsigned int j = 0; j < representatives.size(); j++)
{
edgeList[representatives[j]].first.second = vertexList[i].first;
}
// now open a new edge
unionFind.make_set(vertexList[i].first);
representative = unionFind.find_set(vertexList[i].first);
for(unsigned int j = 0; j < representatives.size(); j++)
unionFind.link(representatives[j], representative);
vertexToUFQueryMap[vertexList[i].first] = vertexList[i].first;
edgeList[representative].first.first = vertexList[i].first;
}
}
}
// put the global "max"
representative = unionFind.find_set(vertexToUFQueryMap[halfStars[vertexList[vertexList.size() - 1].first][0]]);
edgeList[representative].first.second =
vertexList[vertexList.size() - 1].first;
// join/split tree completed.
// now format the output
vtkMutableDirectedGraph *outputGraph = vtkMutableDirectedGraph::New();
std::vector<int> criticalVertices;
std::vector<bool> processedVertices(vertexList.size());
for(unsigned int i = 0; i < processedVertices.size(); i++)
processedVertices[i] = false;
// first, create the list of nodes.
for(unsigned int i = 0; i < edgeList.size(); i++)
{
if(edgeList[i].first.first != -1)
{
// valid edge
if(!processedVertices[edgeList[i].first.first])
{
criticalVertices.push_back(edgeList[i].first.first);
processedVertices[edgeList[i].first.first] = true;
}
if(!processedVertices[edgeList[i].first.second])
{
criticalVertices.push_back(edgeList[i].first.second);
processedVertices[edgeList[i].first.second] = true;
}
}
}
vertexToNodeMap.resize(criticalVertices.size());
vertexProperties = vtkVariantArray::New();
vertexProperties->SetNumberOfValues(1);
vertexIds = vtkIdTypeArray::New();
vertexIds->SetName("Vertex Ids");
outputGraph->GetVertexData()->AddArray(vertexIds);
for(unsigned int i = 0; i < criticalVertices.size(); i++)
{
vertexProperties->SetValue(0, criticalVertices[i]);
vertexToNodeMap[criticalVertices[i]] = i;
outputGraph->AddVertex(vertexProperties);
}
vertexIds->Delete();
vertexProperties->Delete();
vtkVariantArray *deg2NodeIds = vtkVariantArray::New();
deg2NodeIds->SetName("Vertex Ids");
outputGraph->GetEdgeData()->AddArray(deg2NodeIds);
for(unsigned int i = 0; i < edgeList.size(); i++)
{
if(edgeList[i].first.first != -1)
{
// valid edge
int sourceNode = vertexToNodeMap[edgeList[i].first.first],
targetNode = vertexToNodeMap[edgeList[i].first.second];
vtkVariantArray *edgeProperties = vtkVariantArray::New();
vtkIdTypeArray *vertexIdList = vtkIdTypeArray::New();
vertexIdList->SetNumberOfValues(edgeList[i].second.size());
for(unsigned int j = 0; j < edgeList[i].second.size(); j++)
vertexIdList->SetValue(j, edgeList[i].second[j]);
edgeProperties->SetNumberOfValues(1);
edgeProperties->SetValue(0, vertexIdList);
outputGraph->AddEdge(sourceNode, targetNode, edgeProperties);
vertexIdList->Delete();
edgeProperties->Delete();
}
}
deg2NodeIds->Delete();
output->Set(outputGraph);
outputGraph->Delete();
return 1;
}
}
return 0;
}