mhopf at suse.de
Tue Nov 10 03:52:01 PST 2009
On Oct 28, 09 11:02:17 +0100, Éric Piel wrote:
> Op 28-10-09 09:52, Bernard Siaud alias Troumad schreef:
> > I try to translate "man xrandr" in french.
> > I have a problem : I think that the english version is false !
> > Can somebody try the option "--transform" ?
> > I think that the point (x y) of the real screnn give the point
> > ((a b)(x)-(c))/(((g h)(x)+1).i)
> > ((c d)(y) (f)) (y)
> > of the virtual screen.
> I'm the one who wrote this part of the man-page. Just wrote it out of
> guessing, so it can easily be wrong. However, Mandriva Cooker mailing
> list is not the right place, so I'm forwarding the question to xorg-devel.
The man page seems correct, yet there is not enough information to
understand. The mathematics behind this are "homogeneous coordinates"
(see wikipedia). That's a standard concept in computer graphics, so it's
not explained explicitly anywhere AFAIK.
I eventually wanted to improve the description, but didn't have time for
that so far.
Matthias Hopf <mhopf at suse.de> __ __ __
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