evcalibrate

[Sam Lin]

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 <tias at ulyssis.org 
> <mailto:tias at ulyssis.org>> 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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