multi-touch-dev team mailing list archive

["Stephen M. Webb" <stephen.webb@xxxxxxxxxxxxx>]

> ---------- Forwarded message ----------
> From: NguyetQue nguyen <nguyen.tnq@xxxxxxxxx>
> Date: Wed, Feb 9, 2011 at 4:29 PM
> Subject: question about utouch-gesturetest
> To: oubiwann@xxxxxxxxx
> 
> 
> Hello,
> 
> I'm student at the University of Rouen in France. During my Master, i
> have a project of "Touchscreen's applications" that i have to develop.
> I'm really interrested in your developping of gesture.
> I have some questions about gesture event that we have in
> utouch-gesturetest (\utouch-gesturetest\src\main.c):
>   1. How can we get the 2nd, 3rd ... point of gesture when we pinch or
> rotate... with 2 or 3 ... finger?
>   2. what does the property mean? Why is it change its length for each
> gesture (or each point)?
> Would you please answer me, cause i have to developp a project of my
> trainning course.

The utouch-gesturetest program uses the XCB-gesture protocol directly to
communicate with a gesture recognizer built in to the x.org server.  We
have not documented the XCB-gesture protocol because it was considered a
stopgap measure to help bootstrap our uTouch stack and we do not really
intend to support it going forward.

If you want to be able to follow our gesture development work (and we
want you to), I would recommend instead using the GEIS API.  It delivers
exactly the same information as the utouch-gesturetest program displays,
but both follows our ongoing development (because it is an integral
part of the utouch stack) and we promise to support it going forward
regardless of how we change the rest of the stack.

You can find an implementation of the GEIS API in the utouch-geis
project (https://launchpad.net/utouch-geis).  Version 1 of the API is
currently available in Ubuntu 10.10 and later, and version 2
(http://people.canonical.com/~stephenwebb/geis-v2/) is currently under
development.  The source for the project contains an example similar to
gesturetest called geistest that gives an example of use.

-- 
Stephen M. Webb <stephen.webb@xxxxxxxxxxxxx>
Canonical Ltd.