/// <summary>
/// An edge can define a cluster as logical head.
/// This is used to fake edges to and from clusters by clipping the edge on the borders of the logical head.
/// </summary>
public void SetLogicalHead(SubGraph lhead)
{
if (!lhead.IsCluster())
{
throw new InvalidOperationException("ltail must be a cluster");
}
if (!MyRootGraph.IsCompound())
{
throw new InvalidOperationException("rootgraph must be compound for lheads/ltails to be used");
}
string lheadname = lhead.GetName();
SafeSetAttribute("lhead", lheadname, "");
}
/// <summary>
/// An edge can define a cluster as logical head.
/// This is used to fake edges to and from clusters by clipping the edge on the borders of the logical head.
/// </summary>
public SubGraph LogicalHead()
{
if (!MyRootGraph.IsCompound())
{
throw new InvalidOperationException("rootgraph must be compound for lheads/ltails to be used");
}
string lheadname = GetAttribute("lhead");
if (lheadname == null)
{
return(null);
}
return(MyRootGraph.GetSubgraph(lheadname));
}