/// <summary>
///
/// </summary>
/// <param name="n"></param>
/// <returns></returns>
public Node AddNode(Node n)
{
Node node = _nodeMap[n.Coordinate];
if (node == null)
{
_nodeMap.Add(n.Coordinate, n);
return(n);
}
node.MergeLabel(n);
return(node);
}
