private bool IsSimpleLinearGeometry(IGeometry geom)
{
if (geom.IsEmpty)
{
return(true);
}
var graph = new GeometryGraph(0, geom);
var li = new RobustLineIntersector();
var si = graph.ComputeSelfNodes(li, true);
// if no self-intersection, must be simple
if (!si.HasIntersection)
{
return(true);
}
if (si.HasProperIntersection)
{
_nonSimpleLocation = si.ProperIntersectionPoint;
return(false);
}
if (HasNonEndpointIntersection(graph))
{
return(false);
}
if (_isClosedEndpointsInInterior)
{
if (HasClosedEndpointIntersection(graph))
{
return(false);
}
}
return(true);
}
private bool IsSimpleLinearGeometry(MultiLineString geom)
{
if (geom.IsEmpty)
{
return(true);
}
GeometryGraph graph = new GeometryGraph(0, geom);
LineIntersector li = new RobustLineIntersector();
SegmentIntersector si = graph.ComputeSelfNodes(li, true);
// if no self-intersection, must be simple
if (!si.HasIntersection)
{
return(true);
}
if (si.HasProperIntersection())
{
return(false);
}
if (HasNonEndpointIntersection(graph))
{
return(false);
}
if (HasClosedEndpointIntersection(graph))
{
return(false);
}
return(true);
}
/// <summary> Checks validity of a LinearRing.</summary>
private void CheckValid(LinearRing g)
{
CheckInvalidCoordinates(g.Coordinates);
if (validErr != null)
{
return;
}
CheckClosedRing(g);
if (validErr != null)
{
return;
}
GeometryGraph graph = new GeometryGraph(0, g);
CheckTooFewPoints(graph);
if (validErr != null)
{
return;
}
LineIntersector li = new RobustLineIntersector();
graph.ComputeSelfNodes(li, true);
CheckNoSelfIntersectingRings(graph);
}
/// <summary>
/// Checks validity of a LinearRing.
/// </summary>
/// <param name="g"></param>
private void CheckValidRing(ILinearRing g)
{
CheckClosedRing(g);
if (_validErr != null)
{
return;
}
GeometryGraph graph = new GeometryGraph(0, g);
LineIntersector li = new RobustLineIntersector();
graph.ComputeSelfNodes(li, true);
CheckNoSelfIntersectingRings(graph);
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public bool IsNodeConsistentArea()
{
SegmentIntersector intersector = _geomGraph.ComputeSelfNodes(_li);
if (intersector.HasProperIntersection)
{
_invalidPoint = intersector.ProperIntersectionPoint;
return(false);
}
_nodeGraph.Build(_geomGraph);
return(IsNodeEdgeAreaLabelsConsistent());
}
/// <summary>
/// Check all nodes to see if their labels are consistent with
/// area topology.
/// </summary>
/// <returns>
/// <c>true</c> if this area has a consistent node labelling
/// </returns>
public bool IsNodeConsistentArea()
{
// To fully check validity, it is necessary to
// compute ALL intersections, including self-intersections
// Within a single edge.
SegmentIntersector intersector =
geomGraph.ComputeSelfNodes(li, true);
if (intersector.HasProperIntersection())
{
invalidPoint = intersector.ProperIntersectionPoint;
return(false);
}
nodeGraph.Build(geomGraph);
return(IsNodeEdgeAreaLabelsConsistent());
}
/**
* Use a GeometryGraph to node the created edges,
* and create split edges between the nodes
*/
private ArrayList NodeEdges(ArrayList edges)
{
// intersect edges again to ensure they are noded correctly
GeometryGraph graph = new GeometryGraph(0, _geomFact.PrecisionModel, 0);
//for (Iterator i = edges.iterator(); i.hasNext(); )
foreach (object obj in edges)
{
Edge e = (Edge)obj;
graph.AddEdge(e);
}
SegmentIntersector si = graph.ComputeSelfNodes(_li);
/*
* if (si.hasProperIntersection())
* Debug.println("proper intersection found");
* else
* Debug.println("no proper intersection found");
*/
ArrayList newEdges = new ArrayList();
graph.ComputeSplitEdges(newEdges);
return(newEdges);
}