From mboxrd@z Thu Jan  1 00:00:00 1970
From: Henrik Rydberg <rydberg@euromail.se>
Subject: Re: [PATCH] input: mt: Add an envelope tool type
Date: Thu, 09 Dec 2010 02:18:34 +0100
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To: Ping Cheng <pinglinux@gmail.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>, Chase Douglas <chase.douglas@canonical.com>, Jiri Kosina <jkosina@suse.cz>, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org

>>> Those are good questions. Specifying how many touches are in the

>>> envelop makes sense. It also covers rectangle as a special case of
>>> envelop.
>>
>> I have a feeling that trying to accomodate non-rectangular,
> 
> No, we are not talking about non-rectangular shape here. Envelop is
> always a rectangle. By rectangle above, I meant 2 touches.
> 
> An envelop that includes number of touches offers us more information
> than a rectangle does.


All you need to do to know how many points there are is to count them. :-)

Henrik