/// <summary>
/// Returns an enumeration of objects within the given distance around the given coordinates.
/// </summary>
/// <param name="x">The x-value of the coordinate.</param>
/// <param name="y">The y-value of the coordinate.</param>
/// <param name="distance">The distance for the search.</param>
/// <returns>All objects within distance.</returns>
public IEnumerable <T> GetObjectsWithinDistance(double x, double y, double distance)
{
return(_rootNode.GetObjectsWithinDistance(x, y, distance));
}
