You're probably referring to double-buffering: paint everything in a hidden bitmap, and once it is ready, simply copy it to the canvas/screen/whatever-is-visible.<br><br>Laurent<br><br><div class="gmail_quote">On Thu, Sep 23, 2010 at 03:59, Mathew Kurian <span dir="ltr"><<a href="mailto:bluejamesbond@gmail.com">bluejamesbond@gmail.com</a>></span> wrote:<br> <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Hey everybody,<div><br></div><div>I was wondering how universe.ss is so optimized, there is no flickering (esp on faster pcs). What approach does it take?</div> <div><br></div><div>Thank you</div><div><br></div><div>Sincerely,</div> <div><br></div><div>Mathew Kurian<br clear="all"><br>-- <br>Mathew Kurian<div>Seven Lakes High School</div><div><div><font face="arial, helvetica, sans-serif"><i>“Do all the good you can, b</i></font><font face="arial, helvetica, sans-serif"><i>y all the means you can,</i></font></div> <span style="font-family: Arial,sans-serif; font-size: 12px;"><h1 style="margin: 0px;"><font face="arial, helvetica, sans-serif"><span style="font-size: small;"><span style="font-weight: normal;"><i>In all the ways you can, in all the places you can,<br> At all the times you can, to all the people you can,</i></span></span></font></h1><h1 style="margin: 0px;"><font face="arial, helvetica, sans-serif"><span style="font-size: small;"><span style="font-weight: normal;"><i>As long as ever you can.” :) ---John Wesley</i></span></span></font></h1> </span></div><div>Please be sure to visit: <a href="http://www.slhsredcross.com" target="_blank">SLHS RED CROSS</a><br></div><div><font face="arial, helvetica, sans-serif"><i><br></i></font></div><br> </div> <br>_________________________________________________<br> For list-related administrative tasks:<br> <a href="http://lists.racket-lang.org/listinfo/users" target="_blank">http://lists.racket-lang.org/listinfo/users</a><br></blockquote></div><br>