on</B> calls this function as many times as
specified by the <EM>count</EM> argument.
After each call, the content of <TT>*viewsurface*</TT>, which is assumed to
be an xwindow, is copied to a newly created Xwindow pixmap.
These pixmaps are played back by <B>playback-pixmaps</B>.
Similarly, <B>hid-lines-animation</B> extracts visible line segments
from the result of <B>hid</B>, and accumulates them in a list.
The list is then played back by <B>playback-hid-lines</B>.

<P>
Following functions are defined in <