private void ExpandClusterOrder(VectorDataOptics pointDBS)
{
var neighbors = kdTree.PointsWithinRadiusOfWithDistance(pointDBS, Epsilon);
pointDBS.Visited = true;
pointDBS.ReachabilityDistance = double.PositiveInfinity;
pointDBS.SetCoreDistance(neighbors, Epsilon, MinPts);
clusterOrdering.Add(pointDBS);
if (!double.IsPositiveInfinity(pointDBS.CoreDistance))
{
var orderSeeds = new PriorityQueue<VectorDataOptics>();
Update(neighbors, pointDBS, orderSeeds);
while (orderSeeds.IsEmpty() == false)
{
var currentObject = orderSeeds
.Poll();
var neighborsCurrent = kdTree
.PointsWithinRadiusOfWithDistance(pointDBS, Epsilon);
currentObject.Visited = true;
currentObject.SetCoreDistance(neighborsCurrent, Epsilon, MinPts);
clusterOrdering.Add(currentObject);
if (!double.IsPositiveInfinity(currentObject.CoreDistance))
{
Update(neighborsCurrent, currentObject, orderSeeds);
}
}
}
}
private void Update(List<KNNPoint> neighbors,
VectorDataOptics centerObject, PriorityQueue<VectorDataOptics> orderSeeds)
{
var cDist = centerObject.CoreDistance;
foreach (var obj in neighbors)
{
var op = obj.Data as VectorDataOptics;
if (!op.Visited)
{
var newRDistance = Math.Max(cDist, DistanceFunction
.CalculateDistance(op, centerObject));
if (double.IsPositiveInfinity(op.ReachabilityDistance))
{
op.ReachabilityDistance = newRDistance;
orderSeeds.Add(op);
}
else
{
if (newRDistance < op.ReachabilityDistance)
{
op.ReachabilityDistance = newRDistance;
orderSeeds.Remove(op);
orderSeeds.Add(op);
}
}
}
}
}
