private void CopyMembers(GeoCluster old)
{
this._clusterId = old._clusterId;
this._center = old._center;
this._createdAt = old._createdAt;
this._dayTime = old._dayTime;
this._dayCount = old._dayCount;
this._nightCount = old._nightCount;
this._clusterId = old._clusterId;
}
private void WriteCluster(GeoCluster cluster)
{
// [run_id] [smallint] NOT NULL
BulkWriter.WriteSmallInt(RunId);
// [user_id] [bigint] NOT NULL
BulkWriter.WriteBigInt(cluster.UserId);
// [cluster_id] [tinyint] NOT NULL
BulkWriter.WriteTinyInt((sbyte)cluster.ClusterId);
// [location_count] [int] NOT NULL
BulkWriter.WriteInt(cluster.InitialPointCount);
// [location_count_trimmed] [int] NOT NULL
BulkWriter.WriteInt(cluster.FinalPointCount);
// [sigma] [float] NOT NULL
BulkWriter.WriteFloat(cluster.Sigma);
// [lat] [float] NOT NULL
BulkWriter.WriteFloat(cluster.Center.Lat);
// [lon] [float] NOT NULL
BulkWriter.WriteFloat(cluster.Center.Lon);
// [cx] [float] NOT NULL
BulkWriter.WriteFloat(cluster.Center.X);
// [cy] [float] NOT NULL
BulkWriter.WriteFloat(cluster.Center.Y);
// [cz] [float] NOT NULL
BulkWriter.WriteFloat(cluster.Center.Z);
// [htm_id] [bigint] NOT NULL
BulkWriter.WriteFloat(0); // TODO
// [is_day] [bit] NULL
BulkWriter.WriteNullableBit(cluster.DayCount > cluster.NightCount); // TODO: verify
// [day_count] [int] NOT NULL
BulkWriter.WriteInt(cluster.DayCount);
// [night_count] [int] NOT NULL
BulkWriter.WriteInt(cluster.NightCount);
// [iterations] [tinyint] NOT NULL
BulkWriter.WriteTinyInt((sbyte)cluster.TrimmingIter);
BulkWriter.EndLine();
}
/// <summary>
/// Finds FoF clusters in a list of points
/// </summary>
/// <param name="points"></param>
public void FindClusters(IEnumerable <GeoPoint> points)
{
// This will hold results
clusters = new List <GeoCluster>();
// A hash set will contain all points not in a cluster yet
var input = new HashSet <GeoPoint>(points);
var temp = new HashSet <GeoPoint>();
int k = 1;
GeoPoint actual = new GeoPoint();
GeoPoint tempActual = new GeoPoint();
while (input.Count > 0)
{
var gclust = new GeoCluster();
gclust.ClusterId = k;
actual = input.ElementAt(0);
input.Remove(actual);
temp.Add(actual);
while (temp.Count != 0)
{
tempActual = temp.ElementAt(0);
gclust.Points.Add(tempActual);
temp.Remove(tempActual);
foreach (GeoPoint g in input)
{
if (IsFriend(g, tempActual))
{
if (!temp.Contains(g))
{
temp.Add(g);
}
}
}
foreach (GeoPoint g in temp)
{
input.Remove(g);
}
}
clusters.Add(gclust);
k++;
}
}
public GeoCluster(GeoCluster old)
{
CopyMembers(old);
}
