multi-touch-dev team mailing list archive

["Duncan M. McGreggor" <duncan.mcgreggor@xxxxxxxxxxxxx>]

On Feb 16, 2011, at 1:42 AM, Kedar Dharmadhikari-Ennovate wrote:

> Hi  Duncon,
>
> I am facing a particular situation
>
> We are using stylus on white board. The stylus reads X&Y Co- 
> ordinates from the white board and send this co-ordinates to our  
> custom application. The application pass this co-ordinates to multi  
> touch device driver. The Driver takes the help of ginn library to  
> generate the multi touch events and send it to the XOrg layer, the  
> XOrg than passes the event to the application.
>
> To pass the events to XOrg layer we have developed a multi touch  
> device driver which sends a multi touch events to application  
> (Evince and EOG in our case).  But I am facing one problem while I  
> can get the zoom in & zoom out event properly but I am facing lot of  
> problem with rotate event. Whenever I rotate I face following problems
>
> 1)      Rotation is not smooth. i.e. rotation is happening at 90  
> degrees only. I have developed the same kind of device driver in  
> Windows 7, the rotation is very smooth. The image rotates at desired  
> angle.
> 2)      We need to put lot of effort to rotate the image.
>
> Can you guide me on this issue. I want to know is the problem is  
> with my driver or there is some limitations in the  
> applications(Evince or EOG in this case). Can we do full-fledged  
> multi touch on Ubuntu 10.10?
>
> Please let me know your input on this issue as it is very critical  
> for me and my project.
>
> Regards,
> Kedar Dharmadhikari

Cody Russell is the engineer who has been working on our GTK apps. He  
has smooth-zooming implemented for evince. but for us, rotation only  
made sense done in 90-degree increments. Perhaps his smooth-zooming  
code would provide some hints for you?

Cody, is it technically possible to do a smooth-rotation?

Ikbel can correct me if I'm wrong, but I believe that it will not be  
possible to get smooth anything using ginn, since ginn maps gestures  
to key combos... and key combos usually resort in discrete actions.

I'll let the rest of the team reply with their insights...

d


> From: Duncan M. McGreggor [mailto:duncan.mcgreggor@xxxxxxxxxxxxx]
> Sent: Friday, January 07, 2011 8:25 PM
> To: Kedar Dharmadhikari
> Cc: multi-touch-dev@xxxxxxxxxxxxxxxxxxx
> Subject: Re: Utouch test application help
>
> Hello Kedar,
>
> On Jan 4, 2011, at 6:47 AM, Kedar Dharmadhikari wrote:
>
> Hi Duncan,
>
> We are trying to develop a multi touch application in our  
> organisation. I
> want to know how can we develop application for multi touch. I am  
> curious to
> know following things
>
> 1)          I have developed a application using QT framework.  
> ver(4.6.2) is it
> possible for me to receive any multi touch events at application  
> lever for
> 10.10 Ubuntu.
>
> Qt hasn't release support for Ubuntu's uTouch yet. They currently  
> have branches at various levels of development that include support  
> touch in Linux (using uTouch). Denis can better answer what the  
> status is there. Or you can check out the code here:
>   http://qt.gitorious.org/+qt-developers/gestures
>
> I blogged about this some here:
>   http://oubiwann.blogspot.com/2010/10/multitouch-and-qt.html
>
> I am asking you this question because we have developed a
> device driver which sends the event to application, but the  
> developer tells
> me that it is not able to clear the Xwindow layer in Ubuntu 10.10.
>
> 2)          Are you aware of any applications handling multi touch  
> in Ubuntu
> 10.10 available in the market. Because I want to see the demo for such
> applications.
>
> Not using Qt. We've got evince (Document Viewer) supporting MT in  
> Ubuntu, and work on eog is progressing. But both of those are GTK.
>
> Hope this helps,
>
> d
>
> Regards,
> Kedar Dharmadhikari
>
> -----Original Message-----
> From: Chase Douglas [mailto:chase.douglas@xxxxxxxxxxxxx]
> Sent: Tuesday, January 04, 2011 2:18 AM
> To: Shreepad Hardas
> Cc: chase.douglas@xxxxxxxxxx; 'Kedar Dharmadhikari'; Duncan McGreggor
> Subject: Re: Utouch test application help
>
> On 12/29/2010 08:27 AM, Shreepad Hardas wrote:
>
> Hello Chase
>
>                We have a new input device that which we have
> successfully tested with the following test apps
>
> 1.       mtdev-test /dev/input/event4
>
> 2.       grail-touch /dev/input/event4
>
> 3.       grail-gesture 0xFFFFFFFF /dev/input/event4
>
>
>
> event4 is the input device generating Type A multi-touch events.
>
> Could you guide us how to proceed further to write a test application
> under X window system such that the application starts receiving the
> multitouch events.
>
> Hi Shreepad,
>
> As promised, here's a more detailed answer to your question:
>
> Ubuntu's multitouch and gesture solutions can be divided into two
> solutions. The first is implemented in Ubuntu 10.10 and provides for
> gestures using the utouch-geis library. The specification is  
> documented
> (though poorly formatted) at:
>
> https://wiki.ubuntu.com/Multitouch/APIs/GEIS/1.0Spec
>
> If you install the libutouch-geis-doc package in Ubuntu 10.10 you will
> find raw doxygen documentation by directing your browser to:
>
> file:///usr/share/doc/utouch-geis/html/index.html
>
> This first version will be forward ported as necessary for  
> applications
> to work on future versions of Ubuntu.
>
> Our second version will be implemented in Ubuntu 11.04. It will be  
> built
> on top of XInput 2.1 multitouch work. It will provide more features  
> and
> control of multitouch and gesture input than the first version. This
> should be ready for some testing in a month or two.
>
> I know these responses are very high level. Please feel free to ask  
> more
> in depth about anything here or on our mailing list
> multi-touch-dev@xxxxxxxxxxxxxxxxxxx .
>
> Thanks!
>
> -- Chase 
>
> (I've CC'd Duncan McGreggor, the project manager for Ubuntu multitouch
> and gesture work.)
>
>
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