public RTree(RTreeNode root, int minimumDegree)
: this(root, RTree.FindTheBestRectangle, minimumDegree)
{
}
//Untested
public void SplitTheNode(RTreeNode parent, int childIndex)
{
RTreeNode y = parent.GetPointer(childIndex);
parent.RemovePointer(y);
int t = this.MinimumDegree;
int firstChild, secondChild;
y.FindTheMostDistantRectangles(out firstChild, out secondChild);
RTreeNode firstNode = new RTreeNode(); firstNode.IsLeaf = y.IsLeaf;
RTreeNode secondNode = new RTreeNode(); secondNode.IsLeaf = y.IsLeaf;
if (y.IsLeaf)
{
firstNode.AddKey(y.GetKey(firstChild)); secondNode.AddKey(y.GetKey(secondChild));
for (int i = 0; i < y.NumberOfKeys; i++)
{
if (i == firstChild || i == secondChild)
{
continue;
}
if (firstNode.NumberOfKeys == y.NumberOfKeys - t)
{
secondNode.AddKey(y.GetKey(i));
}
else if (secondNode.NumberOfKeys == y.NumberOfKeys - t)
{
firstNode.AddKey(y.GetKey(i));
}
else
{
double firstEnlargement = firstNode.Boundary.GetEnlargementArea(y.GetKey(i));
double secondEnlargement = secondNode.Boundary.GetEnlargementArea(y.GetKey(i));
if (firstEnlargement < secondEnlargement)
{
firstNode.AddKey(y.GetKey(i));
}
else if (firstEnlargement > secondEnlargement)
{
secondNode.AddKey(y.GetKey(i));
}
else
{
if (firstNode.Boundary.GetArea() > secondNode.Boundary.GetArea())
{
secondNode.AddKey(y.GetKey(i));
}
else
{
firstNode.AddKey(y.GetKey(i));
}
}
}
}
}
else
{
firstNode.AddPointer(y.GetPointer(firstChild)); secondNode.AddPointer(y.GetPointer(secondChild));
for (int i = 0; i < y.NumberOfKeys; i++)
{
if (i == firstChild || i == secondChild)
{
continue;
}
if (firstNode.NumberOfKeys == y.NumberOfKeys - t)
{
secondNode.AddPointer(y.GetPointer(i));
}
else if (secondNode.NumberOfKeys == y.NumberOfKeys - t)
{
firstNode.AddPointer(y.GetPointer(i));
}
else
{
double firstEnlargement = firstNode.Boundary.GetEnlargementArea(y.GetPointer(i).Boundary);
double secondEnlaregement = secondNode.Boundary.GetEnlargementArea(y.GetPointer(i).Boundary);
if (firstEnlargement < secondEnlaregement)
{
firstNode.AddPointer(y.GetPointer(i));
}
else if (firstEnlargement > secondEnlaregement)
{
secondNode.AddPointer(y.GetPointer(i));
}
else
{
if (firstNode.Boundary.GetArea() > secondNode.Boundary.GetArea())
{
secondNode.AddPointer(y.GetPointer(i));
}
else
{
firstNode.AddPointer(y.GetPointer(i));
}
}
}
}
}
parent.InsertPointer(childIndex, firstNode);
parent.InsertPointer(childIndex + 1, secondNode);
}