From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754713AbYKNCG3 (ORCPT ); Thu, 13 Nov 2008 21:06:29 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752456AbYKNCF7 (ORCPT ); Thu, 13 Nov 2008 21:05:59 -0500 Received: from ch-smtp02.sth.basefarm.net ([80.76.149.213]:50439 "EHLO ch-smtp02.sth.basefarm.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752276AbYKNCF6 (ORCPT ); Thu, 13 Nov 2008 21:05:58 -0500 Message-ID: <491CDCFF.5010202@euromail.se> Date: Fri, 14 Nov 2008 03:05:51 +0100 From: Henrik Rydberg User-Agent: Thunderbird 2.0.0.17 (X11/20080925) MIME-Version: 1.0 To: jg@laptop.org CC: Peter Hutterer , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] input: Add a detailed multi-touch finger data report References: <1226585461.6651.52.camel@jg-vaio> <491CCC8A.5090109@euromail.se> <1226626758.6651.107.camel@jg-vaio> In-Reply-To: <1226626758.6651.107.camel@jg-vaio> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Originating-IP: 83.248.192.132 X-Scan-Result: No virus found in message 1L0o4J-00011w-8a. X-Scan-Signature: ch-smtp02.sth.basefarm.net 1L0o4J-00011w-8a de040581463a2ca97e6aade6f7532cff Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >> 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.