private BSPCollisionNode GetBSPNode()
{
if (size == 0)
{
return(new BSPCollisionNode(new RectBox(), 0, 0));
}
else
{
int ppos = tail - size;
if (ppos < 0)
{
ppos += MAX_SIZE;
}
BSPCollisionNode node = cache[ppos];
node.SetParent((BSPCollisionNode)null);
--size;
return(node);
}
}
private BSPCollisionNode CheckRemoveNode(BSPCollisionNode node)
{
int idx = 0;
for (; idx < MAX_SIZE;)
{
if (node != null && node.IsEmpty())
{
BSPCollisionNode parent = node.GetParent();
int side = (parent != null) ? parent.GetChildSide(node) : 3;
BSPCollisionNode left = node.GetLeft();
BSPCollisionNode right = node.GetRight();
if (left == null)
{
if (parent != null)
{
if (right != null)
{
right.SetArea(node.GetArea());
}
parent.SetChild(side, right);
}
else
{
this.bspTree = right;
if (right != null)
{
right.SetParent((BSPCollisionNode)null);
}
}
node.SetChild(1, (BSPCollisionNode)null);
ReturnNode(node);
node = parent;
continue;
}
if (right == null)
{
if (parent != null)
{
if (left != null)
{
left.SetArea(node.GetArea());
}
parent.SetChild(side, left);
}
else
{
this.bspTree = left;
if (left != null)
{
left.SetParent((BSPCollisionNode)null);
}
}
node.SetChild(0, (BSPCollisionNode)null);
ReturnNode(node);
node = parent;
continue;
}
}
idx++;
return(node);
}
return(null);
}
