private void CleanUpwards()
{
if (childTL != null)
{
// If all the children are empty leaves, delete all the children
if (childTL.IsEmptyLeaf &&
childTR.IsEmptyLeaf &&
childBL.IsEmptyLeaf &&
childBR.IsEmptyLeaf)
{
lock (lockObject)
{
childTL = null;
childTR = null;
childBL = null;
childBR = null;
}
if (parent != null && Count == 0)
{
parent.CleanUpwards();
}
}
}
else
{
// I could be one of 4 empty leaves, tell my parent to clean up
if (parent != null && Count == 0)
{
parent.CleanUpwards();
}
}
}
private void Relocate(QuadTreeObject <T> item)
{
// Are we still inside our parent?
if (QuadRect.Contains(item.Data.Rect))
{
// Good, have we moved inside any of our children?
if (childTL != null)
{
QuadTreeNode <T> dest = GetDestinationTree(item);
if (item.Owner != dest)
{
// Delete the item from this quad and add it to our child
// Note: Do NOT clean during this call, it can potentially delete our destination quad
QuadTreeNode <T> formerOwner = item.Owner;
Delete(item, false);
dest.Insert(item);
// Clean up ourselves
formerOwner.CleanUpwards();
}
}
}
else
{
// We don't fit here anymore, move up, if we can
if (parent != null)
{
parent.Relocate(item);
}
}
}