private ArrayList CreateSubgraphs()
{
ArrayList subgraphList = new ArrayList();
//for (Iterator i = graph.getNodes().iterator(); i.hasNext(); )
foreach (DictionaryEntry obj in _graph.Nodes)
{
Node node = (Node)obj.Value;
if (!node.IsVisited)
{
BufferSubgraph subgraph = new BufferSubgraph(_cga);
subgraph.Create(node);
subgraphList.Add(subgraph);
}
}
/**
* Sort the subgraphs in descending order of their rightmost coordinate.
* This ensures that when the Polygons for the subgraphs are built,
* subgraphs for shells will have been built before the subgraphs for
* any holes they contain.
*/
//
IComparer reverse = new ReverseOrder();
object[] objarray = subgraphList.ToArray();
Array.Sort(objarray, reverse);
return(new ArrayList(objarray));
//Collections.Sort(subgraphList, Collections.reverseOrder());
//return subgraphList;
}
/// <summary>
/// BufferSubgraphs are compared on the x-value of their rightmost Coordinate. This defines a partial
/// ordering on the graphs such that:
/// g1 >= g2 <==> Ring(g2) does not contain Ring(g1)
/// where Polygon(g) is the buffer polygon that is built from g.
/// This relationship is used to sort the BufferSubgraphs so that shells are guaranteed to
/// be built before holes.
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public int CompareTo(object obj)
{
BufferSubgraph graph = (BufferSubgraph)obj;
if (this.GetRightmostCoordinate().X < graph.GetRightmostCoordinate().X)
{
return(-1);
}
if (this.GetRightmostCoordinate().X > graph.GetRightmostCoordinate().X)
{
return(1);
}
return(0);
}
private void BuildSubgraphs(ArrayList subgraphList, PolygonBuilder polyBuilder)
{
//for (Iterator i = subgraphList.iterator(); i.hasNext(); )
foreach (object obj in subgraphList)
{
BufferSubgraph subgraph = (BufferSubgraph)obj;
Coordinate p = subgraph.GetRightmostCoordinate();
int outsideDepth = 0;
if (polyBuilder.ContainsPoint(p))
{
outsideDepth = 1;
}
subgraph.ComputeDepth(outsideDepth);
subgraph.FindResultEdges();
polyBuilder.Add(subgraph.GetDirectedEdges(), subgraph.GetNodes());
}
}
