[graph-tool] Animations with changing topology

I need to create an interactive animation that shows a continuously updated force-directed graph that starts empty and adds nodes and edges as specified by a process - with each new node causing the force equilibrium to adjust to a new set of positions to incorporate the new node. Is there an example that anyone has seen or could provide which would the simplest idle-loop watching a queue (or other mechanism) for new items, and adding nodes and edges in a continuous interactive force-directed graph animation? Thank you! -caleb (Caleb Howard)