/// <summary>
/// Checks for two duplicate rings in an area.
/// Duplicate rings are rings that are topologically equal
/// (that is, which have the same sequence of points up to point order).
/// If the area is topologically consistent (determined by calling the
/// IsNodeConsistentArea,
/// duplicate rings can be found by checking for EdgeBundles which contain
/// more than one EdgeEnd.
/// (This is because topologically consistent areas cannot have two rings sharing
/// the same line segment, unless the rings are equal).
/// The start point of one of the equal rings will be placed in
/// invalidPoint.
/// </summary>
/// <returns>return true if this area Geometry is topologically consistent but has two duplicate rings</returns>
public bool HasDuplicateRings()
{
foreach (DictionaryEntry node in _nodeGraph)
{
RelateNode relateNode = (RelateNode)node.Value;
foreach (object ees in relateNode.Edges)
{
// awc not sure about all this casting
EdgeEndBundle eeb = (EdgeEndBundle)ees;
if (eeb.EdgeEnds.Count > 1)
{
_invalidPoint = eeb.Edge.GetCoordinate(0);
return(true);
}
}
}
return(false);
}
/// <summary>
/// Checks for two duplicate rings in an area.
/// Duplicate rings are rings that are topologically equal
/// (that is, which have the same sequence of points up to point order).
/// If the area is topologically consistent (determined by calling the
/// isNodeConsistentArea,
/// duplicate rings can be found by checking for EdgeBundles which contain
/// more than one EdgeEnd.
/// (This is because topologically consistent areas cannot have two rings sharing
/// the same line segment, unless the rings are equal).
/// The start point of one of the equal rings will be placed in
/// invalidPoint.
/// </summary>
/// <returns>
/// true if this area Geometry is topologically consistent but has
/// two duplicate rings
/// </returns>
public bool HasDuplicateRings()
{
for (IEnumerator nodeIt = nodeGraph.NodeIterator();
nodeIt.MoveNext();)
{
RelateNode node = (RelateNode)nodeIt.Current;
for (IEnumerator i = node.Edges.Iterator(); i.MoveNext();)
{
EdgeEndBundle eeb = (EdgeEndBundle)i.Current;
if (eeb.EdgeEnds.Count > 1)
{
invalidPoint = eeb.Edge.GetCoordinate(0);
return(true);
}
}
}
return(false);
}