} // private EdgeRing FindShell( ArrayList minEdgeRings )
/// <summary>
/// This method assigns the holes for a Polygon (formed from a list of
/// MinimalEdgeRings) to its shell.
/// Determining the holes for a MinimalEdgeRing polygon serves two purposes:
/// <ul>
/// <li>it is faster than using a point-in-polygon check later on.</li>
/// <li>it ensures correctness, since if the PIP test was used the point
/// chosen might lie on the shell, which might return an incorrect result from the
/// PIP test</li>
/// </ul>
/// </summary>
/// <param name="shell"></param>
/// <param name="minEdgeRings"></param>
private void PlacePolygonHoles(EdgeRing shell, ArrayList minEdgeRings)
{
foreach (object obj in minEdgeRings)
{
MinimalEdgeRing er = (MinimalEdgeRing)obj;
if (er.IsHole)
{
er.Shell = shell;
}
} // foreach ( object obj in minEdgeRings )
} // private void PlacePolygonHoles( EdgeRing shell, ArrayList minEdgeRings )
} // public void LinkDirectedEdgesForMinimalEdgeRings()
public ArrayList BuildMinimalRings()
{
ArrayList minEdgeRings = new ArrayList();
DirectedEdge de = _startDe;
do
{
if (de.MinEdgeRing == null)
{
EdgeRing minEr = new MinimalEdgeRing(de, _geometryFactory, _cga);
minEdgeRings.Add(minEr);
}
de = de.Next;
} while (de != _startDe);
return(minEdgeRings);
} // public ArrayList BuildMinimalRings()
} // public void LinkDirectedEdgesForMinimalEdgeRings()
public ArrayList BuildMinimalRings()
{
ArrayList minEdgeRings = new ArrayList();
DirectedEdge de = _startDe;
do
{
if ( de.MinEdgeRing == null )
{
EdgeRing minEr = new MinimalEdgeRing( de, _geometryFactory, _cga ) ;
minEdgeRings.Add( minEr );
}
de = de.Next;
} while ( de != _startDe );
return minEdgeRings;
} // public ArrayList BuildMinimalRings()