From mboxrd@z Thu Jan 1 00:00:00 1970 From: Henrik Rydberg Subject: Re: [PATCH] input: Add a detailed multi-touch finger data report Date: Fri, 14 Nov 2008 03:05:51 +0100 Message-ID: <491CDCFF.5010202@euromail.se> References: <1226585461.6651.52.camel@jg-vaio> <491CCC8A.5090109@euromail.se> <1226626758.6651.107.camel@jg-vaio> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: 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 In-Reply-To: <1226626758.6651.107.camel@jg-vaio> Sender: linux-input-owner@vger.kernel.org List-Id: linux-input@vger.kernel.org To: jg@laptop.org Cc: Peter Hutterer , linux-input@vger.kernel.org, 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.