.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>index</code> - the curve index specifying the curve to analyse</dd>
<dd><code>rect</code> - the whose boundary is to be tested for intersection
 with this curve</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the distance along the curve from the start at which
 the intersection occurs</dd>
</dl>
</li>
</ul>
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