/code><p></p><br/><br/><span class="label"> Parameters </span><table cellpadding="0" cellspacing="0" border="0"><tr><td width="20px"></td><td><code><span class="label">screen</span>:Sprite</code></td></tr><tr><td class="paramSpacer">&nbsp;</td></tr><tr><td width="20px"></td><td><code><span class="label">xx</span>:Number</code></td></tr><tr><td class="paramSpacer">&nbsp;</td></tr><tr><td width="20px"></td><td><code><span class="label">yy</span>:Number</code></td></tr><tr><td class="paramSpacer">&nbsp;</td></