From: Joe Van Dyk <joevandyk@...>
Date: 2005-07-13T16:23:58+09:00
Subject: Re: Updating GUIs

On 7/12/05, Hidetoshi NAGAI <nagai@ai.kyutech.ac.jp> wrote:
> From: Joe Van Dyk <joevandyk@gmail.com>
> Subject: Re: Updating GUIs
> Date: Wed, 13 Jul 2005 06:18:15 +0900
> Message-ID: <c715e64050712141838df4054@mail.gmail.com>
> > I'm doing this on a TkCanvas.  Each Player has a different polygon
> > (each polygon has about 30 points on it or so).  The polygons have to
> > move around on the canvas and rotate depending on which direction they
> > are going.  So, I'm calling a rotate function for every point on every
>      (snip)
> > poly.coords(coords.collect{|x, y| rotate(deg, x, y, *center)})
> 
> How many steps do you need for rotation?
> If that is integer order, you should create and hide all polygons
> for all rotate steps at the beginning, and show (move) the one for
> current degree on each update phase.

I'm not sure what you mean by "integer order".  In fact, that whole
paragraph confused me.  :-)

> 
> If you can stop updating widgets (e.g. by your own eventloop
> with TclTkLib.do_one_event), please stop updating while moving
> 500 polygons and do update_idletasks after moving all.
> Probably faster than the normal eventloop.
> 
> # I found a bug on TclTkLib.do_one_event and fixed it on CVS today.
> # If you try to use TclTkLib.do_one_event, get the latest tcltklib.c
> # from CVS.
> 
> And when an application calls Tcl/Tk interpreter very frequently,
> the cost for conversion of arguments (Ruby object -> Tcl string)
> is sometimes too large. In such case, TclTkIp._eval may make the
> application faster.

How can I use TclTklp._eval?
 
> # However, as you say, TkCanvas may not be proper. ;-)

Thanks for your help!