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<HTML><HEAD><TITLE>Xlib Programming Manual: Computing with Regions</TITLE></HEAD><BODY><H1 ALIGN=center>16.5.3 Computing with Regions</H1>To generate the smallest rectangle enclosing a region, use<B><A HREF="XClipBox.html">XClipBox()</A></B>.<P>To compute the intersection of two regions, use<B><A HREF="XIntersectRegion.html">XIntersectRegion()</A></B>.<P>To compute the union of two regions, use<B><A HREF="XUnionRegion.html">XUnionRegion()</A></B>.<P>To create a union of a source region and a rectangle, use<B><A HREF="XUnionRectWithRegion.html">XUnionRectWithRegion()</A></B>.<P>To subtract two regions, use<B><A HREF="XSubtractRegion.html">XSubtractRegion()</A></B>.<P>To calculate the difference between the union and intersection of two regions, use<B><A HREF="XXorRegion.html">XXorRegion()</A></B>.<H5 ALIGN=right><I>Next: <A HREF="comparing.html">Determining if Regions Are Empty or Equal</A></I></H5><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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