s="anchor" aria-label="anchor" href="#details"></a></h2>
    <p>If the shape is "free", it allows the user to draw a perimeter to
select/remove objects. If the shape is "circle", it allows the user to
click on the center and edge of the circle to define the desired area. If
the shape is "rectangle", it allows the user to select two points to define
the area.</p>
    </div>

    <div class="section level2">
    <h2 id="ref-examples">Examples<a class="anchor" aria-label="anchor" href="#ref-examples"></a></h2>