by curves such as <code>Curves.elasticInOut</code>).</p>
<p>Values for <code>t</code> are usually obtained from an <a href="dart-html/Animation-class.html">Animation&lt;double&gt;</a>, such as
an <code>AnimationController</code>.</p>
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implementation</span></h2>
      <pre class="language-dart"><code class="language-dart">static Radius lerp(Radius a, Radius b, double t) {
  assert(t != null);
  if (a == null &amp;&amp; b