private static void ExpandCluster <XType, YType>(IDbscanPoint <XType, YType>[] points, IDbscanPoint <XType, YType> p, IDbscanPoint <XType, YType>[] neighbors, int cid, int eps, int minimumClusterCount)
{
p.ClusterId = cid;
Queue <IDbscanPoint <XType, YType> > q = new Queue <IDbscanPoint <XType, YType> >(neighbors);
while (q.Count > 0)
{
IDbscanPoint <XType, YType> n = q.Dequeue();
if (!n.IsVisited)
{
n.IsVisited = true;
IDbscanPoint <XType, YType>[] ns = DbscanAlgorithm.GetNeighors(points, n, eps);
if (ns.Length >= minimumClusterCount)
{
foreach (IDbscanPoint <XType, YType> item in ns)
{
q.Enqueue(item);
}
}
}
else if (!n.ClusterId.HasValue)
{
n.ClusterId = cid;
}
}
}
/// <summary>
/// Determines whether the specified point neighbors the current instance using the specified value.
/// </summary>
/// <param name="point">The point to test as a neighor.</param>
/// <param name="eps">The value to use to find neighoring points.</param>
/// <returns>True if the point is a neighbor; otherwise, false.</returns>
public bool IsNeighbor(IDbscanPoint <int, int> point, double eps)
{
int dis = TaskBitmap.DistanceBetween(new Point(point.X, point.Y), new Point(this.X, this.Y));
return(dis < eps);
}
private static IDbscanPoint <XType, YType>[] GetNeighors <XType, YType>(IDbscanPoint <XType, YType>[] points, IDbscanPoint <XType, YType> point, int eps)
{
List <IDbscanPoint <XType, YType> > neighbors = new List <IDbscanPoint <XType, YType> >();
neighbors.Add(point);
foreach (IDbscanPoint <XType, YType> p in points)
{
if (point.IsNeighbor(p, eps))
{
neighbors.Add(p);
}
}
return(neighbors.ToArray());
}
