On Wed, Oct 2, 2013 at 2:18 PM, Rafael Antognolli <antogno...@gmail.com> wrote:
> Hi Jason,
>
> On Wed, Oct 2, 2013 at 5:59 PM, Jason Gerecke <killert...@gmail.com> wrote:
>> Hello,
>>
>> I'm a developer for the linuxwacom project. For the past few weeks
>> I've been reading up on Tizen, which is a new Linux-based OS for
>> mobile devices. Since its quite similar to other Linux distributions,
>> I've been trying to figure out how to get pen data up to apps. Tizen
>> apps are written in HTML5, which is being extended to support pen
>> events[1]. With Webkit shaping up to provide apps access to this
>> API[2], the only remaining layer I'm not sure about is the EFL glue
>> that binds X and Webkit together.
>>
>> I'm wondering what it would take to get e.g. pen pressure flowing up
>> through EFL to appplications. I've taken a quick look through the API
>> and underlying code, and while there doesn't appear to be explicit pen
>> support there appears to be some foundation that could be built on
>> (e.g. "multi" events look very interesting, though appear to be
>> semantically intended for multitouch not pen).
>
> Indeed, multi events seem to already provide the needed "pen data". Do
> you need any data that is not already provided from the multi events?
> Can you be more specific?
>
There's quite a bit of information available, so its a matter of
figuring out what is needed and what makes sense.The analog pen/puck
axes basically boil down to: X, Y, pressure, x-tilt, y-tilt,
z-rotation, and absolute-fingerwheel ("distance" may also become
available with Wayland). The "pad" device has some additional controls
("touchstrips" and "touchrings") whose values we also report. Beyond
this, the X driver also exposes some other digital information (e.g.
tool serial and model ID) through device properties.If its OK to extend the multi event, sensible additions might be tilt-azimuth (tilt-altitude already exists as "angle"), rotation, and fingerwheel data. Interpreting the other analog axes is usually left to the driver (e.g. touchstrips and touchrings are usually configured to emulate a mouse scroll or press a keyboard shortcut to increase/decrease brush size), and I'm not sure if it makes sense to relay the digital information inside the multi event. > I know that some data, although there are attributes available from > the events structure, might have not been implemented, like pressure, > angle and radius. But the infra is there. > I had noticed this. It looks like the multi pressure and angle fields only need to be initialized in the XCB and/or xlib backends. >> Is there any interest in providing EFL applications with pen data? >> More importantly, is there anyone willing to help a newbie to the >> project like myself? > > If you are providing something new, I think it's a good idea. But > would be nice to look carefully if we don't provide the means to work > with the said pen data already. Send your proposals to the list and > people will give it thoughts. > > BTW, take a look at the multi-touch example, it might be helpful and > you could improve it if you want: > https://git.enlightenment.org/core/efl.git/tree/src/examples/evas/evas-multi-touch.c > Thanks -- I'll be sure take a look at that example. I had some difficulty banging out a multitouch EFL app, so it'll be good to compare :D Jason --- Now instead of four in the eights place / you’ve got three, ‘Cause you added one / (That is to say, eight) to the two, / But you can’t take seven from three, / So you look at the sixty-fours.... ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60134791&iu=/4140/ostg.clktrk _______________________________________________ enlightenment-devel mailing list enlightenment-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/enlightenment-devel
