ectangle, i.e., the rectangle formed from the
inner-most centers of the ellipses that form the corners. This is the
intersection of the <a href="dart-ui/RRect/wideMiddleRect.html">wideMiddleRect</a> and the <a href="dart-ui/RRect/tallMiddleRect.html">tallMiddleRect</a>. If any of
the intersections are void, the resulting <a href="dart-ui/Rect-class.html">Rect</a> will have negative width
or height.</p>
        </section>
                <section class="summary source-code" id="source">
          <h2><span>I