      <td>(</td>
          <td class="paramtype">const <a class="el" href="classutils_1_1Vector2d.html">utils::Vector2d</a> &amp;&#160;</td>
          <td class="paramname"><em>x</em></td><td>)</td>
          <td></td>
        </tr>
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  </td>
  <td class="mlabels-right">
<span class="mlabels"><span class="mlabel">pure virtual</span></span>  </td>
  </tr>
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