public CoverNode <T> FindContainingField(SpatialObj <T> rect, CoverNode <T> starting_node)
{
if (starting_node.IsPointInNode(rect.boundingBox.Center))
{
bool contained_in_node = starting_node.IsObjectInNode(rect);
if (contained_in_node && !starting_node.CanSink(rect))
{
return(starting_node);
}
foreach (CoverNode <T> child in starting_node.GetChildren())
{
var potential_node = FindContainingField(rect, child);
if (potential_node != null)
{
return(potential_node);
}
}
if (contained_in_node)
{
return(starting_node);
}
}
return(null);
}