/// <summary> /// Returns the {@link Node} at the given location, /// or null if no {@link Node} was there. /// </summary> /// <param name="pt">the location to query /// </param> /// <returns> the node found /// </returns> /// <returns> /// <c>null</c> if this graph contains no node at the location /// </returns> public Node FindNode(Coordinate pt) { return((Node)nodeMap.Find(pt)); }