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<HTML><HEAD><TITLE>Xlib Programming Manual: XEmptyRegion</TITLE></HEAD><BODY><H1 ALIGN=center>XEmptyRegion</H1><H2>Syntax</H2><!.IN "XEmptyRegion" "" "@DEF@"><CODE><PRE>Bool XEmptyRegion(<B>r</B>) <A HREF="./">Region</A> <B>r</B>;</PRE></CODE><H2>Arguments</H2><TABLE><TR><TD> <B>r</B><TD> Specifies the region.</TABLE><H2>Description</H2> The<B>XEmptyRegion()</B>function returns<B>True</B>if the region is empty.<H2>See also</H2><B><A HREF="XCreateRegion.html">XCreateRegion()</A></B>,<B><A HREF="XEqualRegion.html">XEqualRegion()</A></B>,<B><A HREF="XIntersectRegion.html">XIntersectRegion()</A></B>,<B><A HREF="XPointInRegion.html">XPointInRegion()</A></B>,<B><A HREF="XRectInRegion.html">XRectInRegion()</A></B>,"<A HREF="comparing.html">Determining if Regions Are Empty or Equal</A>".<HR><ADDRESS><A HREF="http://tronche.com/">Christophe Tronche</A>, <A HREF="mailto:ch.tronche@computer.org">ch.tronche@computer.org</A></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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