ethod">springLength</a> and the distance.
When the distance is greater than the length, the force pulls the vertexes closer to each other.
When the distance is less than the length, the force pushes them apart.</p>
<p>The two vertexes connected by the edge E are acted upon by a force of proportional to
<code>springStiffness(E) * (getNodeDistance(E.fromVertex, E.toVertex) - springLength(E))</code> divided by the distance between the vertexes.
Please read the Introduction page on <a href="../../intro/extensio