t this method can be useful for instance to define a clickable area inside
an image.
<h2>Parameters</h2>
<dl class="param">
<dt><code>x</code></dt>
<dd>
Abscissa of the upper-left corner of the rectangle.
</dd>
<dt><code>y</code></dt>
<dd>
Ordinate of the upper-left corner of the rectangle.
</dd>
<dt><code>w</code></dt>
<dd>
Width of the rectangle.
</dd>
<dt><code>h</code></dt>
<dd>
Height of the rectangle.
</dd>
<dt><code>link</code></dt>
<dd>
URL or identifier returned by AddLink().
