[racket] plot pixel position

On 04/15/2014 04:48 PM, John Clements wrote:
> On Apr 15, 2014, at 11:59 AM, David Vanderson <david.vanderson at gmail.com> wrote:
>> Question for GUI experts: Is there a reason why multiple repaint requests in the queue should not be coalesced into a single paint?
> I had this problem recently, and it turned out that the problem was that I was calling “printf” as part of the handling of the redraw request. Removing this allowed coalescing to occur.
>
> Probably unrelated, but maybe worth a try.
>
I remembered you had that issue, and removing all the printf statements 
was the first thing I tried.  Alas, that doesn't work for me.  Thanks 
for the reminder!

Dave