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foucault |
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#include "HypergraphLib_platform.h"
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#include "HypergraphLib_Graph.h"
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#include "HypergraphLib_Node.h"
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#include "HypergraphLib_Arc.h"
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#include <set>
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#include <vector>
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#include <map>
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/**
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* Algorithme de décomposition d'un graphe en filaments
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*/
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namespace HypergraphLib {
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HYPERGRAPHLIB_ITEM void
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Filaments ( Graph * G, std::vector < std::vector < int > > & __filaments )
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{
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std::set <int> visited;
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std::set <int> next;
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std::vector <int> filament;
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std::set <int> unvisited;
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std::set <int> adjacentNodes;
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// Initialize the set of unvisited nodes
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for (Graph::MapNodesById::const_iterator itNodes = G->GetNodes().begin();
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itNodes != G->GetNodes().end();
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itNodes++ )
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{
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unvisited.insert (itNodes->first);
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}
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while (unvisited.size() > 0)
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{
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Node * N = G->GetNode(*(unvisited.begin()));
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for (std::set<int>::const_iterator itAN = unvisited.begin();
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itAN != unvisited.end();
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itAN++ )
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{
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Node * N2 = G->GetNode(*itAN);
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if (N2->IncidentArcs().size() == 1)
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{
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N = N2;
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break;
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}
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}
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visited.insert(N->Id());
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unvisited.erase(unvisited.find(N->Id()));
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next.clear();
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adjacentNodes.clear();
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N->AdjacentNodes(adjacentNodes);
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for (std::set<int>::const_iterator itAN = adjacentNodes.begin();
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itAN != adjacentNodes.end();
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itAN++ )
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{
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if ( visited.find (*itAN) == visited.end() )
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{
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next.insert (*itAN);
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break;
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}
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}
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filament.clear();
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filament.push_back (N->Id());
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while (next.size() > 0)
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{
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N = G->GetNode(*(next.begin()));
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visited.insert(N->Id());
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unvisited.erase(unvisited.find(N->Id()));
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adjacentNodes.clear();
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next.clear();
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filament.push_back (N->Id());
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N->AdjacentNodes(adjacentNodes);
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for (std::set<int>::const_iterator itAN = adjacentNodes.begin();
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itAN != adjacentNodes.end();
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itAN++ )
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{
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// printf("Candidate node %d\n",*itAN);
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if ( visited.find (*itAN) == visited.end() )
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{
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int count_filament_adjacency = 0;
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std::vector<int>::const_iterator it_fil = filament.begin();
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bool is_adjacent_to_start=false;
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bool is_adjacent_to_end=false;
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Node * fN=NULL;
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it_fil = filament.begin();
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fN = G->GetNode (*it_fil);
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is_adjacent_to_start = fN->IsAdjacentToNode(*itAN);
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it_fil = filament.end();it_fil--;
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fN = G->GetNode (*it_fil);
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is_adjacent_to_end = fN->IsAdjacentToNode(*itAN);
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for ( it_fil = filament.begin();
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it_fil != filament.end(); it_fil++)
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{
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fN = G->GetNode (*it_fil);
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if (fN->IsAdjacentToNode(*itAN))
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count_filament_adjacency++;
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}
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it_fil = filament.end();it_fil--;
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// printf("count_filament_adjacency = %d, is_adjacent_to_(%d)=%d\n", count_filament_adjacency,*it_fil,is_adjacent_to_end);
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it_fil = filament.begin();
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// printf("is_adjacent_to_(%d)=%d\n",*it_fil,is_adjacent_to_start);
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bool is_not_T = true;
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if ( is_adjacent_to_end && is_adjacent_to_start)
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{
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for ( it_fil = filament.begin();
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it_fil != filament.end(); it_fil++)
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{
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fN = G->GetNode (*it_fil);
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for ( Node::MultimapArcsById::const_iterator itArcs = fN->IncidentArcs().begin();
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itArcs != fN->IncidentArcs().end();
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itArcs++ )
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{
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Arc * arc = itArcs->second;
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if ( arc->Nodes().find(*itAN) != arc->Nodes().end()
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&& arc->Nodes().find(filament[0]) != arc->Nodes().end()
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&& arc->Nodes().find(filament[filament.size()-1]) != arc->Nodes().end() )
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{
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is_not_T = false;
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}
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}
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}
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}
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if (count_filament_adjacency == 1 || ( is_adjacent_to_end && is_adjacent_to_start && is_not_T) )
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{
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next.insert (*itAN);
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// printf("Candidate Node %d choosen!\n", *itAN);
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break;
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}
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}
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}
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}
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__filaments.push_back(filament);
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}
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}
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}
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