public void Insert(TBounds bounds, TItem entry, ISpatialIndexNode <TBounds, TItem> node, INodeSplitStrategy <TBounds, TItem> nodeSplitStrategy, IndexBalanceHeuristic heuristic, out ISpatialIndexNode <TBounds, TItem> newSiblingFromSplit)
{
newSiblingFromSplit = null;
//TODO: handle null node..
// Terminating case
if (node.IsLeaf)
{
node.Add(entry);
// Handle node overflow
if (node.ItemCount > heuristic.NodeItemMaximumCount)
{
// Split the node using the given strategy
newSiblingFromSplit = nodeSplitStrategy.SplitNode(node, heuristic);
//if (++_tempSplitCount % 100 == 0)
//{
// Debug.Print("Node split # {0}", _tempSplitCount);
//}
}
}
else
{
// NOTE: Descending the tree recursively here
// can make for a very expensive build of a tree,
// even for moderate amounts of data.
Double leastExpandedArea = Double.MaxValue;
Double leastExpandedChildArea = Double.MaxValue;
//TBounds currentBounds = new ComputationExtents(bounds);
ISpatialIndexNode <TBounds, TItem> leastExpandedChild;
leastExpandedChild = findLeastExpandedChild(node.SubNodes,
bounds,
leastExpandedArea,
leastExpandedChildArea);
Debug.Assert(leastExpandedChild != null);
// Found least expanded child node - insert into it
Insert(bounds, entry, leastExpandedChild, nodeSplitStrategy,
heuristic, out newSiblingFromSplit);
// Adjust this node...
node.Bounds.ExpandToInclude(bounds);
// Check for overflow and add to current node if it occured
if (newSiblingFromSplit != null)
{
// Add new sibling node to the current node
node.Add(newSiblingFromSplit);
newSiblingFromSplit = null;
// Split the current node, since the child count is too high,
// and return the split to the caller
if (node.ItemCount > heuristic.NodeItemMaximumCount)
{
newSiblingFromSplit = nodeSplitStrategy.SplitNode(node, heuristic);
}
}
}
}
