top_left_position)</span>
            </dt>
            <dd>Constructor.</dd>
          </dl>
        </section>
        <section id="pub-methods">
          <h2><a href="#pub-methods">Public functions</a></h2>
          <dl class="m-doc">
            <dt id="a018ccf7d6702a2b256e0cb28bd6e52db">
              <span class="m-doc-wrap-bumper">auto <a href="#a018ccf7d6702a2b256e0cb28bd6e52db" class="m-doc-self">bg</a>(</span><span class="m-doc-wrap">) const -&gt; const <a href="classbn_1_1affine__bg__ptr.html" 