/// <summary>
/// For each dirEdge in the star, merge the label .
/// </summary>
public virtual void MergeSymLabels()
{
for (IEnumerator it = GetEnumerator(); it.MoveNext();)
{
DirectedEdge de = (DirectedEdge)it.Current;
Label label = de.Label;
label.Merge(de.Sym.Label);
}
}
