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<HTML><HEAD><TITLE>Xlib Programming Manual: Getting Pointer Motion History</TITLE></HEAD><BODY><H1 ALIGN=center>11.7 Getting Pointer Motion History</H1>Some X server implementations will maintain a more completehistory of pointer motion than is reported by event notification.The pointer position at each pointer hardware interrupt may bestored in a buffer for later retrieval.This buffer is called the motion history buffer.For example, a few applications, such as paint programs,want to have a precise history of where the pointertraveled. However, this historical information is highly excessive for most applications.<P>To determine the approximate maximum number of elements in the motion buffer, use<B><A HREF="XDisplayMotionBufferSize.html">XDisplayMotionBufferSize()</A></B>.<P>To get the motion history for a specified window and time, use<B><A HREF="XGetMotionEvents.html">XGetMotionEvents()</A></B>.<H5 ALIGN=right><I>Next: <A HREF="protocol-errors/">Handling Protocol Errors</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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