From:	"Stefan Viljoen" <Stefan_Viljoen AT excite DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: ASCII GUI
Date:	Mon, 15 Jan 2001 19:57:55 +0200
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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?

Directly access video RAM at 0xB800 - there is a simple formula to calculate
linear memory addresses from X,Y pairs. Check my programming page
http://home.intekom.com/rylan/
for examples of directly accessing VGA 320x200x256 graphics memory - this
code can work in 80x25x16 color text mode by simply changing the segment
address from 0xA000 ot 0xB800 and fiddling a little with the formula used to
plot points. Note that you'll need to use assembly to use my method, though!

Regards,

Stefan Viljoen
F/EMS Dispatcher
Potchefstroom F/EMS
http://home.intekom.com/rylan/

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