linux-kernel - Re: [PATCH] input: Add a detailed multi-touch finger data report

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Message-ID: <491CDCFF.5010202@euromail.se>
Date:	Fri, 14 Nov 2008 03:05:51 +0100
From:	Henrik Rydberg <rydberg@...omail.se>
To:	jg@...top.org
CC:	Peter Hutterer <peter.hutterer@...-t.net>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] input: Add a detailed multi-touch finger data report

>> Right. :-) I believe the ellipse model is adequate, because it is the
>> simplest model that allows for utilization of the orientation of a
>> single finger, for instance to turn a knob. At this point, it seems
>> like tough enough a challenge.
>>
>
> Maybe; but modeling this as a parallelogram or trapezoid may be easier
> to deal with computationally when you stroke a path from the data, to
> which you may have fit a spline....

I believe the word "ellipse" is taken too literally here. Orientation
and eccentricity are two parameters describing a non-circular
object. I does not have to be realized as ellipses on a screen.
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