/// <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> /// Adds an Edge, DirectedEdges, and Nodes for the given LineString representation /// of an edge. /// </summary> public void AddEdge(ILineString lineString) { if (lineString.IsEmpty) return; Coordinate[] coordinates = CoordinateArrays.RemoveRepeatedPoints(lineString.Coordinates); Coordinate startCoordinate = coordinates[0]; Coordinate 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); }
/// <summary> /// Adds an Edge, DirectedEdges, and Nodes for the given LineString representation /// of an edge. /// </summary> public void AddEdge(ILineString lineString) { if (lineString.IsEmpty) { return; } Coordinate[] coordinates = CoordinateArrays.RemoveRepeatedPoints(lineString.Coordinates); Coordinate startCoordinate = coordinates[0]; Coordinate 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); }
/// <summary> /// Builds a geometry (<see cref="LineString" /> or <see cref="MultiLineString" />) /// representing the sequence. /// </summary> /// <param name="sequences"> /// An enumeration of <see cref="IList{DirectedEdge}" />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(IEnumerable <IEnumerable <DirectedEdge> > sequences) { IList <IGeometry> lines = new List <IGeometry>(); foreach (IList <DirectedEdge> seq in sequences) { foreach (DirectedEdge de in seq) { LineMergeEdge e = (LineMergeEdge)de.Edge; ILineString line = e.Line; ILineString lineToAdd = line; if (!de.EdgeDirection && !line.IsClosed) { lineToAdd = Reverse(line); } lines.Add(lineToAdd); } } return(lines.Count == 0 ? _factory.CreateMultiLineString(new ILineString[] { }) : _factory.BuildGeometry(lines)); }