From:	"Alexei A. Frounze" <dummy_addressee AT hotmail DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: ASCII GUI
Date:	Sun, 14 Jan 2001 20:59:55 -0500
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Hey!

You may notice how fast TurboVision (text GUI from Turbo Pascal) is. It's
even fast on 286!
So the things to think of are:
1. turn off cursor while redrawing, if it bores you
2. perform redraws in an off-screen buffer which should be a) usually
noticable faster and b) is hidden from user
3. think of window clipping. if you redraw a window entirely regardless of
whether it's visible to user or not (e.g. under other windows). this should
make some performance improvements
4. turn on optimizations in GCC (perhaps this should go before 1 and 2 :))
5. if the thing is still slow, then there's something wrong with your code
because GCC does very good optimization so that you often don't need to
think of ASM at all

Good Luck
--
Alexei A. Frounze
alexfru [AT] chat [DOT] ru
frounze [AT] ece [DOT] rochester [DOT] edu
http://alexfru.chat.ru
http://members.xoom.com/alexfru/
http://welcome.to/pmode/

"Jon" <lennier AT online DOT no> wrote in message
news:57n86.4082$wt2 DOT 26425 AT news1 DOT oke DOT nextra DOT no...
> I'm fairly new to programming, and have just started writing a program in
> DJGPP which uses
> an ASCII GUI. The problem is that, it redraws the GUI very slow. Even on
my
> 850 MHZ Athlon, I can see the cursor drawing up the GUI. Currently I use
the
> gotoxy(); function and cprintf(); to draw the GUI.
> But when doing big redraws, it just become too slow, like on another
program
> I made, I used the ASCII character 219 to form a word, which I moved
across
> the screen. This was also terrible slow.
> So, do anyone know of a better way to draw up ASCII graphics without using
> the gotoxy and cprintf?
>
> Jon
>
>

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