/// <summary>
/// Creates a new subgraph of the given <see cref="PlanarGraph"/>
/// </summary>
/// <param name="parentGraph">the parent graph
/// </param>
public Subgraph(PlanarGraph parentGraph)
{
this.parentGraph = parentGraph;
edges = new HashedSet();
dirEdges = new ArrayList();
nodeMap = new NodeMap();
}
/// <summary>
/// Constructs a PlanarGraph without any Edges, DirectedEdges, or Nodes.
/// </summary>
public PlanarGraph()
{
m_arrEdges = new ArrayList();
dirEdges = new ArrayList();
nodeMap = new NodeMap();
}
