From: Florian Echtler <floe@butterbrot.org>
To: Henrik Rydberg <rydberg@euromail.se>
Cc: Joonyoung Shim <jy0922.shim@samsung.com>,
linux-input@vger.kernel.org, dmitry.torokhov@gmail.com,
jkosina@suse.cz
Subject: Re: Questions about Multi-touch Protocal
Date: Tue, 05 Jan 2010 13:42:13 +0100 [thread overview]
Message-ID: <1262695333.8529.8.camel@pancake> (raw)
In-Reply-To: <4B432BDB.3000103@euromail.se>
> The TOUCH and WIDTH parameters have a geometrical interpretation; imagine
> looking through a window at someone gently holding a finger against the glass.
> You will see two regions, one inner region consisting of the part of the finger
> actually touching the glass, and one outer region formed by the perimeter of the
> finger. The diameter of the inner region is the ABS_MT_TOUCH_MAJOR, the diameter
> of the outer region is ABS_MT_WIDTH_MAJOR. Now imagine the person pressing the
> finger harder against the glass. The inner region will increase, and in general,
> the ratio ABS_MT_TOUCH_MAJOR / ABS_MT_WIDTH_MAJOR, which is always smaller than
> unity, is related to the finger pressure.
> In addition to the MAJOR parameters, the oval shape of the finger can be
> described by adding the MINOR parameters, such that MAJOR and MINOR are the
> major and minor axis of an ellipse. Finally, the orientation of the oval shape
> can be describe with the ORIENTATION parameter.
> Hope this explains it a bit further.
Very interesting writeup, thanks a lot. Is there any currently any
hardware which is available to end-users and does support these
features? AFAIR most capacitive touchscreens don't have high enough
resolution to actually detect, e.g., twisting. If there's a commercial
option, I'd like to hear about it..
Florian
--
0666 - Filemode of the Beast
next prev parent reply other threads:[~2010-01-05 12:48 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-05 6:18 Questions about Multi-touch Protocal Joonyoung Shim
2010-01-05 12:08 ` Henrik Rydberg
2010-01-05 12:42 ` Florian Echtler [this message]
2010-01-05 12:55 ` Henrik Rydberg
2010-01-05 17:49 ` Dmitry Torokhov
2010-01-06 0:49 ` Joonyoung Shim
2010-01-13 20:21 ` Henrik Rydberg
2010-01-13 22:25 ` Peter Hutterer
2010-01-14 0:35 ` Henrik Rydberg
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