Re: CDC.TextOut

From:
"AliR \(VC++ MVP\)" <AliR@online.nospam>
Newsgroups:
microsoft.public.vc.mfc
Date:
Mon, 12 Mar 2007 18:40:44 GMT
Message-ID:
<M8hJh.130$Um6.47@newssvr12.news.prodigy.net>
If it is for avionics then you can get away with updating it every 3
seconds, since pilots generally look at each instrument every 3 to 4
seconds, and that's under IMC, during VFR flights make that 5 minutes. ;)

But seriously 1000Hz would mean 1000/sec, since I am not sure any computer
today can display text that fast I don't think you are really getting to
that frequency anyway, but the reason you are seeing the flicker is the fact
that a human eye can't see it that fast. It's like watching a car wheel at
some speeds it looks like it's going backwards.

That's assuming that you are double buffering the earsing part and the
drawing part.

If you are not doing the double buffering then you you might want to do that
first.

AliR.

"C Hill MBSC" <CHillMBSC@discussions.microsoft.com> wrote in message
news:DDC8F159-B0C5-43F7-BA56-BE31D45A6867@microsoft.com...

Hi! Really it is just for the hell of it! Keep engineering, nothing is
slow
here, especially in Avionics, that is what I'm used to, not flicker!
--
Engineering

"AliR (VC++ MVP)" wrote:

Why does your counter need to update 1000/sec? A human eye wouldn't be
able
to see that.

AliR.

"C Hill MBSC" <CHillMBSC@discussions.microsoft.com> wrote in message
news:D29D41B1-829E-4A85-8752-0EF8751FD2D4@microsoft.com...

Dear All!

Has anyone had problems with the screen flickering using the CDC member
fuction "TextOut", with an update rate of 1000 Hz using on-screen
counters
in
the View's OnDraw() function, or anything else ?

--
Engineering

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