/// <summary>
/// Builds a geometry (<see cref="LineString" /> or <see cref="MultiLineString" />)
/// representing the sequence.
/// </summary>
/// <param name="sequences">
/// A <see cref="IList" /> of <see cref="IList" />s of <see cref="DirectedEdge" />s
/// with <see cref="LineMergeEdge" />s as their parent edges.
/// </param>
/// <returns>
/// The sequenced geometry, or <c>null</c> if no sequence exists.
/// </returns>
private IGeometry BuildSequencedGeometry(IList sequences)
{
IList lines = new ArrayList();
IEnumerator i1 = sequences.GetEnumerator();
while (i1.MoveNext())
{
IList seq = (IList)i1.Current;
IEnumerator i2 = seq.GetEnumerator();
while (i2.MoveNext())
{
DirectedEdge de = (DirectedEdge)i2.Current;
LineMergeEdge e = (LineMergeEdge)de.Edge;
LineString line = e.Line;
ILineString lineToAdd = line;
if (!de.EdgeDirection && !line.IsClosed)
{
lineToAdd = Reverse(line);
}
lines.Add(lineToAdd);
}
}
if (lines.Count == 0)
{
return(factory.CreateMultiLineString(new LineString[0]));
}
return(new GeometryFactory(factory).BuildGeometry(lines));
}
/// <summary>
/// Adds an Edge, DirectedEdges, and Nodes for the given LineString representation
/// of an edge.
/// </summary>
public virtual void AddEdge(LineString lineString)
{
if (lineString.IsEmpty)
{
return;
}
ICoordinate[] coordinates = CoordinateArrays.RemoveRepeatedPoints(lineString.Coordinates);
ICoordinate startCoordinate = coordinates[0];
ICoordinate endCoordinate = coordinates[coordinates.Length - 1];
Node startNode = GetNode(startCoordinate);
Node endNode = GetNode(endCoordinate);
DirectedEdge directedEdge0 = new LineMergeDirectedEdge(startNode, endNode,
coordinates[1], true);
DirectedEdge directedEdge1 = new LineMergeDirectedEdge(endNode, startNode,
coordinates[coordinates.Length - 2], false);
Edge edge = new LineMergeEdge(lineString);
edge.SetDirectedEdges(directedEdge0, directedEdge1);
Add(edge);
}