thanks for your work.
and suggest to take a look on future migration from hal to udev.
some info:
https://wiki.edubuntu.org/X/InputConfiguration
Sam
於 2010年01月27日 12:22, Alan McCosh 提到:
Tias,
I'm impressed by xinput_calibrate's design, especially with the
research you did before writing it. I was not aware of several of the
calibration utilites you mentioned on your site.
I built evcalibrate last summer strictly to serve the needs of my
employer and hoped it might be useful to someone else. Now that i'm
aware of xinput_calibrator, it's really nice to compare solutions for
the evdev backend.
I noticed a TODO statement in your evdev Calibrator class:
// TODO: swap_xy and flip_x/flip_y stuff
This is one area where I think evcalibrate does a good job. Given the
data from at least 1 touch event in each quadrant of the screen, we
can determine exactly which combination of flipx, flipy, and swapxy
values are appropriate. That being said, it looks like your
implementation is just fine. Evdev must be doing a linear
transformation based on the min/max x/y pairs that supports, for
instance, minx being greater than maxx. I always assumed it wasn't
that smart.
My front-end is designed in large part to make calibration as quick
and painless as possible. The results aren't incredibly accurate but
are generally good enough for desktop touchscreens (15-17"). In the
future, I might simply try adding evcalibrate's Qt/OpenGL interface as
a front-end to xinput_calibrator.
Cheers,
Alan
On Mon, Jan 25, 2010 at 7:16 AM, Tias <[email protected]
<mailto:[email protected]>> wrote:
Hey Alan,
On Fri, Jan 22, 2010 at 10:47:25PM -0500, Alan McCosh wrote:
> A new tool is available for evdev touchscreen calibration,
evcalibrate.
> http://sourceforge.net/projects/evcalibrate/
>
> First, apologies to the creator(s) of ev_calibrate. I picked
the name
> without first considering the existence of similarly named software.
I don't think he minds. As far as I know, that project is unmaintained
for some years. The only touchscreen calibration software of which I
know it is actively maintained is xinput_calibrator, and now
evcalibrate
: )
> - Evcalibrate uses a very simple approach to determining the
filpx, flipy,
> swapxy values. Only 4 screen touches are required.
> - Written in c++/qt/opengl, quite a few packages are required to
> build/deploy.
> - Support is pretty good for certain ELO, 3M, and eGalax
screens. I've not
> had access to other hardware so beyond those I can't be certain.
> - Some patching of evdev was required to better support the 3M
and eGalax
> screens. These patches are available from the same project site,
> http://sourceforge.net/projects/evcalibrate/
>
> Feedback/criticism is welcome, especially for users of new/different
> hardware.
I'm speaking from my experience with xinput_calibrator:
We seem to have quite a different approach: in dependencies, the
way the
clicks are read, maybe even the way we calculate the calibration, ...
I think it would be good to see what we can learn from eachother, to
avoid duplicate work etc.
Kind regards, Tias
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