ength of the spring representing an edge.
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/extensions.html">Extensions</a> for how to override methods and how to call this base method.</p>
</div><div class="tsd-parameters"><h4 class="tsd-parameters-title">Parameters</h4><ul 