/// <summary>
/// Finds the two nearest items from this tree
/// and another tree,
/// using <see cref="IItemDistance{Envelope, TItem}"/> as the distance metric.
/// A Branch-and-Bound tree traversal algorithm is used
/// to provide an efficient search.
/// The result value is a pair of items,
/// the first from this tree and the second
/// from the argument tree.
/// </summary>
/// <param name="tree">Another tree</param>
/// <param name="itemDist">A distance metric applicable to the items in the trees</param>
/// <returns>The pair of the nearest items, one from each tree or <c>null</c> if no pair of distinct items can be found.</returns>
public TItem[] NearestNeighbour(STRtree <TItem> tree, IItemDistance <Envelope, TItem> itemDist)
{
if (IsEmpty || tree.IsEmpty)
{
return(null);
}
var bp = new BoundablePair <TItem>(Root, tree.Root, itemDist);
return(NearestNeighbour(bp));
}
/**
* Tests whether some two items from this tree and another tree
* lie within a given distance.
* {@link ItemDistance} is used as the distance metric.
* A Branch-and-Bound tree traversal algorithm is used
* to provide an efficient search.
*
* @param tree another tree
* @param itemDist a distance metric applicable to the items in the trees
* @param maxDistance the distance limit for the search
* @return true if there are items within the distance
*/
public bool IsWithinDistance(STRtree <TItem> tree, IItemDistance <Envelope, TItem> itemDist, double maxDistance)
{
var bp = new BoundablePair <TItem>(Root, tree.Root, itemDist);
return(IsWithinDistance(bp, maxDistance));
}