<div dir="ltr">Could you work around this by tracking mouse movements and, when you see a refresh call that comes with a mouse movement doing something different than drawing? (I guess you'd need to set a timer that expired in a short time and refresh then, just in case it was a "real" refresh, but at least you could work around the performance issue.)<div>
<br></div><div style>Robby</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Feb 12, 2013 at 1:02 PM, Robby Findler <span dir="ltr"><<a href="mailto:robby@eecs.northwestern.edu" target="_blank">robby@eecs.northwestern.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I was using os x 10.7.5 (and saw the same flashing).</div><div class="HOEnZb"><div class="h5"><div class="gmail_extra">
<br><br><div class="gmail_quote">On Tue, Feb 12, 2013 at 12:59 PM, Philipp Dikmann <span dir="ltr"><<a href="mailto:philipp@dikmann.de" target="_blank">philipp@dikmann.de</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">The OS here is Mac OS 10.6.8, running Racket 5.3.1 -<br>
so I guess its an issue with the OpenGL implementation.<br>
Thanks for taking a look, though :)<div><div><br>
<br>
<br>
On 12.02.13 19:37, Michael Wilber wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Your OpenGL example still doesn't flash for me when I move the mouse<br>
over it, on 64-bit linux.<br>
<br>
It does, however, flash when I change window focus... for some reason?<br>
<br>
What OS are you using?<br>
<br>
Philipp Dikmann <<a href="mailto:philipp@dikmann.de" target="_blank">philipp@dikmann.de</a>> writes:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I'm sorry, I should have been more specific – it happens when using a<br>
gl-enabled canvas (example below).<br>
I hope that does not turn it into a dragons' den? ;)<br>
<br>
Philipp<br>
<br>
#lang racket/gui<br>
<br>
(require sgl)<br>
<br>
(define c%<br>
(class canvas%<br>
(inherit with-gl-context swap-gl-buffers)<br>
(define/override (on-paint)<br>
(with-gl-context<br>
(lambda ()<br>
(gl-clear-color (random) (random) (random) 1)<br>
(gl-clear 'color-buffer-bit)<br>
(swap-gl-buffers)<br>
(gl-flush))))<br>
(super-new (style '(gl no-autoclear)))))<br>
<br>
(define f (new frame% [label ""] [width 100] [height 100]))<br>
(define c (new c% [parent f]))<br>
(send f show #t)<br>
<br>
<br>
On 11.02.13 22:39, Robby Findler wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I don't think it does that. The program below, at least for me,<br>
doesn't do crazy colors when I move the mouse around (it does when<br>
resizing, tho).<br>
<br>
Robby<br>
<br>
#lang racket/gui<br>
<br>
(define c%<br>
(class canvas%<br>
(inherit get-client-size get-dc)<br>
(define/override (on-paint)<br>
(define-values (w h) (get-client-size))<br>
(define dc (get-dc))<br>
(define c (make-object color% (random 255) (random 255) (random<br>
255)))<br>
(send dc set-brush c 'solid)<br>
(send dc set-pen "black" 1 'transparent)<br>
(send dc draw-ellipse 0 0 w h))<br>
(super-new)))<br>
<br>
(define f (new frame% [label ""] [width 100] [height 100]))<br>
(define c (new c% [parent f]))<br>
(send f show #t)<br>
<br>
<br>
On Mon, Feb 11, 2013 at 9:41 AM, Philipp Dikmann <<a href="mailto:philipp@dikmann.de" target="_blank">philipp@dikmann.de</a><br>
<mailto:<a href="mailto:philipp@dikmann.de" target="_blank">philipp@dikmann.de</a>>> wrote:<br>
<br>
It appears that the GUI canvas% refreshes itself whenever it<br>
receives a mouse-event%.<br>
I intend to refresh the canvas at a steady pace (using a timer%)<br>
and independently of any mouse-events instead.<br>
Is there a reasonable way to suppress the default behavior?<br>
<br>
Thanks for your time,<br>
Philipp<br>
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<br>
</blockquote>
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</blockquote></blockquote>
<br>
</div></div></blockquote></div><br></div>
</div></div></blockquote></div><br></div>