private Dictionary <TopoTroncon, TopoNode> GetAccessibleNodes(Topology topology, TopoNode topoNode)
{
Dictionary <TopoTroncon, TopoNode> nodesByTroncon = new Dictionary <TopoTroncon, TopoNode>();
if (topoNode.IdTroncons.Any())
{
foreach (var idTroncon in topoNode.IdTroncons)
{
if (topology.TopoTroncons.ContainsKey(idTroncon))
{
TopoTroncon trn = topology.TopoTroncons[idTroncon];
int idNode = trn.IdNodes.Except(new int[] { topoNode.Id }).SingleOrDefault();
nodesByTroncon[trn] = topology.TopoNodes[idNode];
}
}
}
return(nodesByTroncon);
}
private void Compute()
{
// 1. Add all edges start and end points -> distinct topology nodes
// We want to have a pointer for each troncon to start and end geometry
int index = 0;
foreach (Troncon troncon in Troncons)
{
SqlGeometry start = troncon.StartPoint;
SqlGeometry end = troncon.EndPoint;
if (!NodeAdded(start))
{
AddNode(start, index++);
}
if (!NodeAdded(end))
{
AddNode(end, index++);
}
}
// 2. get connections between nodes and edges
Dictionary <int, TopoNode> newNodes = new Dictionary <int, TopoNode>();
foreach (var topoNode in TopoNodes)
{
var connectedTroncons = Troncons.Where(t => t.StartPoint.STEquals(topoNode.Value.Geometry).IsTrue ||
t.EndPoint.STEquals(topoNode.Value.Geometry).IsTrue)
.ToList();
// Is the topology node an "IGN node" ?
// Yes => proceed
// No => IGN indicates that this is a bridge or tunnel and there are in fact
// multiple nodes connecting only two edges at once
if (IsIgnNode(topoNode) || connectedTroncons.Count == 1)
{
topoNode.Value.IdTroncons.UnionWith(connectedTroncons.Select(t => t.Id));
}
else
{
if (connectedTroncons.Count % 2 != 0)
{
Trace.TraceWarning($"Bridge or tunnel has a weird number of connections. Edges: {string.Join<int>(", ", connectedTroncons.Select(t=>t.Id))}");
}
List <ColinearGroup> colinearGroups = FindColinearTroncons(connectedTroncons, topoNode.Value.Geometry);
bool firstGroup = true;
foreach (var group in colinearGroups)
{
// avoid to make topoNode orphan
// add new node on second iteration only
if (!firstGroup)
{
index++;
//Debug.WriteLine("new " + index.ToString());
var newNode = new TopoNode(index, topoNode.Value);
newNodes.Add(index, newNode);
newNode.IdTroncons.UnionWith(group.ColinearTroncons.Select(t => t.Id));
}
else
{
Debug.Assert(topoNode.Value.IdTroncons.Count == 0, "Toponode is already connected.");
topoNode.Value.IdTroncons.UnionWith(group.ColinearTroncons.Select(t => t.Id));
firstGroup = false;
}
}
}
}
// 3. Merge nodes
foreach (var newNode in newNodes)
{
TopoNodes.Add(newNode.Key, newNode.Value);
}
TopoTroncons = new Dictionary <int, TopoTroncon>();
foreach (var topoNode in TopoNodes)
{
foreach (var idTroncon in topoNode.Value.IdTroncons)
{
if (!TopoTroncons.ContainsKey(idTroncon))
{
TopoTroncons[idTroncon] = new TopoTroncon {
IdTroncon = idTroncon, Geometry = Troncons.First(t => t.Id == idTroncon).Geometry
};
}
TopoTroncons[idTroncon].IdNodes.Add(topoNode.Value.Id);
}
}
}