 href="LayerGroup.html" title="Zif::Layers::LayerGroup (class)">LayerGroup</a></span> width times height.</p>

<p>Deciding between <span class='object_link'><a href="" title="Zif::Layers::SimpleLayer (class)">SimpleLayer</a></span> and <span class='object_link'><a href="ActiveLayer.html" title="Zif::Layers::ActiveLayer (class)">ActiveLayer</a></span> depends on your application.  Try organizing your layers into those that don’t change at all, or only change when action (like camera movement) isn’t happe