  <tr><td class="paramname">path</td><td>the trajectory </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>length the length of path </dd></dl>
<div class="fragment"><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;{</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;  <span class="keywordtype">double</span> length = 0.0;</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;  <span cl