/// <summary>
/// Adds an Edge, DirectedEdges, and Nodes for the given LineString representation
/// of an edge.
/// </summary>
public void AddEdge(LineString lineString)
{
if (lineString.IsEmpty)
{
return;
}
var coordinates = CoordinateArrays.RemoveRepeatedPoints(lineString.Coordinates);
if (coordinates.Length < 2)
{
return; // same check already added in PolygonizeGraph (see #87 and #146)
}
var startCoordinate = coordinates[0];
var endCoordinate = coordinates[coordinates.Length - 1];
var startNode = GetNode(startCoordinate);
var endNode = GetNode(endCoordinate);
var directedEdge0 = new LineMergeDirectedEdge(startNode, endNode,
coordinates[1], true);
var directedEdge1 = new LineMergeDirectedEdge(endNode, startNode,
coordinates[coordinates.Length - 2], false);
var edge = new LineMergeEdge(lineString);
edge.SetDirectedEdges(directedEdge0, directedEdge1);
Add(edge);
}
/// <summary>
///
/// </summary>
/// <param name="start"></param>
/// <returns></returns>
private EdgeString BuildEdgeStringStartingWith(LineMergeDirectedEdge start)
{
var edgeString = new EdgeString(_factory);
var current = start;
do
{
edgeString.Add(current);
current.Edge.Marked = true;
current = current.Next;
}while (current != null && current != start);
return(edgeString);
}
/// <summary>
/// Adds a directed edge which is known to form part of this line.
/// </summary>
/// <param name="directedEdge"></param>
public void Add(LineMergeDirectedEdge directedEdge)
{
directedEdges.Add(directedEdge);
}
