// If pxBoundingBox is null, it will search everywhere
public void GetAssociatedNodes(Entity entity, FRectangle?pxBoundingBox, ref List <QuadTreeNode> result)
{
if (IsLeafNode)
{
if (Entities.Contains(entity))
{
result.Add(this);
}
return;
}
if (pxBoundingBox == null || ChildNode1.Intersects(pxBoundingBox.Value))
{
ChildNode1.GetAssociatedNodes(entity, pxBoundingBox, ref result);
}
if (pxBoundingBox == null || ChildNode2.Intersects(pxBoundingBox.Value))
{
ChildNode2.GetAssociatedNodes(entity, pxBoundingBox, ref result);
}
if (pxBoundingBox == null || ChildNode3.Intersects(pxBoundingBox.Value))
{
ChildNode3.GetAssociatedNodes(entity, pxBoundingBox, ref result);
}
if (pxBoundingBox == null || ChildNode4.Intersects(pxBoundingBox.Value))
{
ChildNode4.GetAssociatedNodes(entity, pxBoundingBox, ref result);
}
}
internal void GetEntities(FRectangle?pxRegion, ref List <Entity> result)
{
if (Entities.Count > 0)
{
foreach (Entity entity in Entities)
{
if (!result.Contains(entity)) // TODO: This needs to be removed. It is slow and should not be here
{
result.Add(entity);
}
}
}
else
{
if (IsLeafNode)
{
return;
}
if (pxRegion == null || ChildNode1.Intersects(pxRegion.Value))
{
ChildNode1.GetEntities(pxRegion, ref result);
}
if (pxRegion == null || ChildNode2.Intersects(pxRegion.Value))
{
ChildNode2.GetEntities(pxRegion, ref result);
}
if (pxRegion == null || ChildNode3.Intersects(pxRegion.Value))
{
ChildNode3.GetEntities(pxRegion, ref result);
}
if (pxRegion == null || ChildNode4.Intersects(pxRegion.Value))
{
ChildNode4.GetEntities(pxRegion, ref result);
}
}
}
public void Add(Entity entity)
{
float pxHalfWidth = pxBounds.Width / 2.0f;
float pxHalfHeight = pxBounds.Height / 2.0f;
if ((IsLeafNode && Entities.Count < QuadTree.EntityLimit) || pxHalfWidth <= QuadTree.pxTileWidth || pxHalfHeight <= QuadTree.pxTileHeight)
{
if (!Entities.Contains(entity))
{
Entities.Add(entity);
}
return;
}
if (IsLeafNode)
{
ChildNode1 = QuadTree.GetQuadTreeNode(
pxBounds.X,
pxBounds.Y,
pxHalfWidth,
pxHalfHeight,
this);
ChildNode2 = QuadTree.GetQuadTreeNode(
pxBounds.X + pxHalfWidth,
pxBounds.Y,
pxHalfWidth,
pxHalfHeight,
this);
ChildNode3 = QuadTree.GetQuadTreeNode(
pxBounds.X,
pxBounds.Y + pxHalfHeight,
pxHalfWidth,
pxHalfHeight,
this);
ChildNode4 = QuadTree.GetQuadTreeNode(
pxBounds.X + pxHalfWidth,
pxBounds.Y + pxHalfHeight,
pxHalfWidth,
pxHalfHeight,
this);
}
// Add the entity specified in the function paramaters
if (ChildNode1.Intersects(entity.CurrentBoundingBox))
{
ChildNode1.Add(entity);
}
if (ChildNode2.Intersects(entity.CurrentBoundingBox))
{
ChildNode2.Add(entity);
}
if (ChildNode3.Intersects(entity.CurrentBoundingBox))
{
ChildNode3.Add(entity);
}
if (ChildNode4.Intersects(entity.CurrentBoundingBox))
{
ChildNode4.Add(entity);
}
// Distrobute any entities found in this current Node
foreach (Entity entityToAdd in this.Entities)
{
if (ChildNode1.Intersects(entityToAdd.CurrentBoundingBox))
{
ChildNode1.Add(entityToAdd);
}
if (ChildNode2.Intersects(entityToAdd.CurrentBoundingBox))
{
ChildNode2.Add(entityToAdd);
}
if (ChildNode3.Intersects(entityToAdd.CurrentBoundingBox))
{
ChildNode3.Add(entityToAdd);
}
if (ChildNode4.Intersects(entityToAdd.CurrentBoundingBox))
{
ChildNode4.Add(entityToAdd);
}
}
Entities.Clear();
}