idget layout.







</dd>
    <dt>
    <a name = "paint_background"></a>
    <strong>paint_background()</strong>
    </dt>
    <dd>
    Called once per update cycle to (re-)draw the entire surface background.







</dd>
    <dt>
    <a name = "update"></a>
    <strong>update()</strong>
    </dt>
    <dd>
    Called once per update cycle to (re-)draw the entire surface foreground.







</dd>
    <dt>
    <a name = "error_handler"></a>
    <strong>error_handler(err)</strong>
    </dt>
    <dd>
    Simple