//判断是否是核心点
public static List <CabMetaData> IsKeyPoint(NewGrid grid, List <CabMetaData> lst, CabMetaData point)
{
List <CabMetaData> indexList = NewGrid.RangeQuery(grid, point, eps);
if (indexList.Count >= minPts)
{
point.extension = "true";
return(indexList);
}
else
{
return(null);
}
}
public static double eps = 0.005; //ε半径
//dbscan过程（深度优先方法）
public static List <DBscanCluster> ApplyDbscan(NewGrid grid, List <CabMetaData> pointsList)
{
List <DBscanCluster> resultList = new List <DBscanCluster>();// 存储最后的聚类结果
foreach (CabMetaData point in pointsList)
{
if (!point.extension.Equals(""))
{
continue;
}
else
{
List <CabMetaData> neighboursList = NewGrid.RangeQuery(grid, point, eps);
if (neighboursList.Count >= minPts)
{
point.extension = "core";
resultList.Add(new DBscanCluster());
resultList[resultList.Count - 1].Add(point);
Stack <CabMetaData> neighbourStack = new Stack <CabMetaData>();
foreach (CabMetaData neightbour in neighboursList)
{
if (!neightbour.CabMetaDataId.Equals(point.CabMetaDataId))//没必要把查询点也压入栈中（尽管不影响正确性），减少出栈次数
{
neighbourStack.Push(neightbour);
}
}
while (neighbourStack.Count > 0)
{
CabMetaData currentPoint = neighbourStack.Pop();
if (currentPoint.extension.Equals("") || currentPoint.extension.Equals("noice"))//如果标记为"core"或"neighbour"，说明已经被处理过了
{
resultList[resultList.Count - 1].Add(currentPoint);
if (currentPoint.extension.Equals(""))//如果标记为"noice"，说明肯定不是核心点
{
List <CabMetaData> newNeighboursList = NewGrid.RangeQuery(grid, currentPoint, eps);
if (neighboursList.Count >= minPts)//ε邻域大于密度阈值，标记为"core"
{
currentPoint.extension = "core";
foreach (CabMetaData neightbour in newNeighboursList)
{
if (!neightbour.CabMetaDataId.Equals(currentPoint.CabMetaDataId))//没必要把查询点也压入栈中（尽管不影响正确性），减少出栈次数
{
neighbourStack.Push(neightbour);
}
}
}
else//ε邻域小于密度阈值，标记为"neighbour"
{
currentPoint.extension = "neighbour";
}
}
}
}
}
else
{
point.extension = "noice";
}
}
}
return(resultList);
}
