GraphReduction.h

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#pragma once
 
#include <ogdf/basic/Graph.h>
#include <ogdf/basic/List.h>
#include <ogdf/basic/basic.h>
 
namespace ogdf {
 
 
 
class OGDF_EXPORT GraphReduction : public Graph {
protected:
    const Graph* m_pGraph; // original graph
    NodeArray<node> m_vOrig; // corresponding node in original graph
    EdgeArray<List<edge>> m_eOrig; // corresponding edge in original graph
 
    NodeArray<node> m_vReduction; // corresponding node in graph copy
    EdgeArray<edge> m_eReduction; // corresponding chain of edges in graph copy
 
    GraphReduction() : m_pGraph(nullptr) { }
 
public:
    // construction
    explicit GraphReduction(const Graph& G);
 
    virtual ~GraphReduction() { }
 
    // returns original graph
    const Graph& original() const { return *m_pGraph; }
 
    // returns original node
    node original(node v) const { return m_vOrig[v]; }
 
    // returns original edges
    const List<edge>& original(edge e) const { return m_eOrig[e]; }
 
    // returns reduction of node v (0 if none)
    node reduction(node v) const { return m_vReduction[v]; }
 
    // returns reduction of edge e
    edge reduction(edge e) const { return m_eReduction[e]; }
};
 
}