/// <summary>
///
/// </summary>
/// <param name="nodeFact"></param>
public PlanarGraph(NodeFactory nodeFact)
{
nodes = new NodeMap(nodeFact);
}
/// <summary>
///
/// </summary>
/// <param name="nodeFact"></param>
public NodeMap(NodeFactory nodeFact)
{
this.nodeFact = nodeFact;
}