Graph layout tool

hi all.
i'm looking for a SIMPLE graph layout alogrithm that would "normalize" a graph.
say a graph has a few nodes and they all have the same coordinates, this alogrithm would make sure that they'd be evenly spread.
the simpler the better.

example -
say i have three nodes and two edges.
Node1(1,1), Node2(1,2), Node3(1,3)
Edge(Node1, Node2), Edge(Node2,Node3)
normalize (nodeArr na) - would return a graph where Node1 is still at (1,1), but the others would change their position so all nodes are same distance from each other.

thanks for your time.
any help appreciated.