Message-ID:	<33FEA990.75815B64@bspu.ac.by>
Date:	Sat, 23 Aug 1997 12:12:48 +0300
From:	Alexander Bokovoy <bokovoy AT bspu DOT ac DOT by>
Organization:	BSPU named after Maxim Tank
MIME-Version:	1.0
To:	syzmik AT concentric DOT net
CC:	djgpp AT delorie DOT com
Subject:	Re: GRX 2.0 and Mouse Flicker

> After hacking up some code for using the mouse, in polled mode, I was
> horrified by the amount of flicker. Can someone post interrupt driven or
> some flicker free mouse code for GRX v2? Here's what I got:
[snip]
> 
>  while (!(MS.buttons & GR_M_RIGHT))
>  {
>   GrMouseGetEvent(GR_M_POLL, &MS);
>   if (MS.buttons & GR_M_LEFT)
>    GrPlot(MS.x, MS.y, 15);
>  }
> 
[snip]
For flicker free mouse you should hide mouse before your drawing
because if you do not this GRX will hide/show mouse evertime when you
call draw functions. E.g. :
>  while (!(MS.buttons & GR_M_RIGHT))
>  {
>   GrMouseGetEvent(GR_M_POLL, &MS);
>   if (MS.buttons & GR_M_LEFT)
    {
    GrEraseMouseCursor();
    // DO some drawings
>    GrPlot(MS.x, MS.y, 15);
    GrDisplayMouseCursor();
    }
>  }
And if you drawing is big (e.g more 10 draw calls at one time) this
trick not only kill flicks but dramastically speed graphics output.
I beleive that this GrPlot call not the one call in this cicle in your
real program :)
-- 
Alexander Bokovoy, <bokovoy AT bspu DOT ac DOT by>
---== The Soft Age coming soon ==---

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