Comments on: More multitouchy fun

By: MacSlow

MacSlow — Wed, 21 Jan 2009 03:20:10 +0000

Carlos, what a very cool surprise! I got to give that a spin soon!

By: Vectorcorpse

Vectorcorpse — Tue, 20 Jan 2009 22:56:24 +0000

couldn’t someone hack a driver to connect mpx to reacTIVision framework?
i think i read something regarding this some time on the old mpx website.
this kind of tables are easy to setup and cheap.
http://mtg.upf.es/reactable/?software
i’d love to get one working with mpx

By: wiz

wiz — Tue, 20 Jan 2009 17:43:28 +0000

looks cool! great work!

By: Supporto “Multi-Point X” per GTK+ - Crismon’s Blog

Supporto “Multi-Point X” per GTK+ - Crismon’s Blog — Tue, 20 Jan 2009 16:36:25 +0000

[...] Nel frattempo, chiunque sia interessato ad ottenere maggiori informazioni a riguardo, oppure intenda mettere il tutto alla prova, vi rimandiamo al blog di Carlos Garnacho. [...]

By: carlosg

carlosg — Tue, 20 Jan 2009 15:40:29 +0000

@oliver: Hmm, I fear you can’t distinguish devices as you want, with stock GTK+ (xinput disabled), it will be always the “core pointer” that generated all mouse events, that situation doesn’t change with currently available XInput.

In XInput 2.0, you have master devices (or MD, that is, pointers on the screen) and slave devices (or SD, phisical mice, touchpads…), several SD can be attached to a MD, and widgets get events from MDs, which makes things tricky.

There is XDeviceClassesChangedEvent, which is sent when the SD sending through the MD changes, and GTK+ could listen to this, but event->device would still point to the MD. So there’s no straighforward solution

By: carlosg

carlosg — Tue, 20 Jan 2009 15:19:21 +0000

@Kevin: Yeah, of course, but I tend to think in that as the topping, there are more important things to fix before. Or maybe I suck at marketing and that should have been the very first step

By: Kevin Lange

Kevin Lange — Tue, 20 Jan 2009 14:50:54 +0000

@Carlos: Someone should work on that. We’ve had this for how long now?

By: carlosg

carlosg — Tue, 20 Jan 2009 14:46:47 +0000

@Luc: hey! yeah, I’m using a combination of mice/trackball/touchpad, AFAIK the only multitouch device with MPX-aware Xorg driver available is the DiamondTouch [1], but it’s insanely expensive…

[1] http://www.circletwelve.com/ , http://www.merl.com/projects/DiamondTouch/

By: oliver

oliver — Tue, 20 Jan 2009 14:41:47 +0000

Oh, hey, a “GTK + X input” hacker! Sorry that this is offtopic, but maybe you could give me a hint for this: when handling a mouse button event in GTK, is there a way to discover from which device the event came? There are several places in Gnome desktop where mousewheel events from a touchpad should be ignored while mousewheel events from a real mouse should be used (for example http://bugzilla.gnome.org/show_bug.cgi?id=402528). Do you have an idea how to distinguish that?

By: luc

luc — Tue, 20 Jan 2009 14:21:15 +0000

This looks really cool!
What do you use to control the pointers in the videos? (3 mice?)