private float SpanByAxis(Axis axis, KdTreeHolder <T> holder)
{
var axisMin = ByAxis(axis, holder.fatRect.min);
var axisMax = ByAxis(axis, holder.fatRect.max);
return(axisMax - axisMin);
}
private void AddAndRefreshInternal(KdTreeHolder <T> holder)
{
AssertConsistency();
KdTreeNode <T> fittingLeaf = DetermineFittingLeaf(holder);
AddInternal(holder, fittingLeaf);
RefreshAndMarkParents(fittingLeaf);
AssertConsistency();
}
private KdTreeNode <T> DetermineFittingLeaf(KdTreeHolder <T> holder)
{
var node = root;
while (node.type == NodeType.Inner)
{
node = node.DetermineInnerNode(holder);
}
return(node);
}
private void RemoveInternal(KdTreeHolder <T> holder)
{
var node = holder.parent;
holder.RemoveFromHolderList();
while (node != null)
{
node.count--;
node = node.parent;
}
}
private void AddInternal(KdTreeHolder <T> holder, KdTreeNode <T> newParent)
{
holder.AddToHolderList(newParent);
var node = newParent;
while (node != null)
{
node.count++;
node = node.parent;
}
}
public void AddToHolderList(KdTreeNode <T> newParent)
{
KdTreeHolder <T> oldfirst = newParent.leaf.holder;
newParent.leaf.holder = this;
if (oldfirst != null)
{
oldfirst.sibling.prev = this;
}
parent = newParent;
sibling.next = oldfirst;
sibling.prev = null;
}
private AaRect?CalculateNewBounds()
{
if (type == NodeType.Leaf)
{
AaRect? newBounds = null;
KdTreeHolder <T> holder = leaf.holder;
while (holder != null)
{
newBounds = AaRects.MergeNullable(newBounds, holder.fatRect);
holder = holder.sibling.next;
}
return(newBounds);
}
return(AaRects.MergeNullable(inner.nodeLess.bounds, inner.nodeBoth.bounds, inner.nodeMore.bounds));
}
public KdTreeNode <T> DetermineInnerNode(KdTreeHolder <T> holder)
{
var pos = DetermineInnerNodePosition(holder.fatRect);
switch (pos)
{
case ChildPosition.Less:
return(inner.nodeLess);
case ChildPosition.More:
return(inner.nodeMore);
default:
return(inner.nodeBoth);
}
}
private void UpdateAndRefreshInternal(KdTreeHolder <T> holder)
{
AssertConsistency();
if (!holder.Update(this))
{
return;
}
KdTreeNode <T> oldLeaf = holder.parent;
KdTreeNode <T> newLeaf = DetermineFittingLeaf(holder);
if (oldLeaf == newLeaf)
{
RefreshAndMarkParents(oldLeaf);
return;
}
AssertConsistency();
RemoveInternal(holder);
AddInternal(holder, newLeaf);
RefreshAndMarkParents(oldLeaf);
RefreshAndMarkParents(newLeaf);
AssertConsistency();
}
internal void DisposeHolder(KdTreeHolder <T> holder)
{
holder.sibling.prev = null;
holder.sibling.next = null;
allocationCacheHolder.Add(holder);
}
private static int CompareByY(KdTreeHolder <T> a, KdTreeHolder <T> b)
{
return(a.fatRect.max.y.CompareTo(b.fatRect.max.y));
}