[PATCH libinput 2/3] Implement support for pen barrel rotation

[Peter Hutterer]

On Mon, Dec 08, 2014 at 12:13:17PM -0800, Bill Spitzak wrote:
> Why not call it Z instead of TWIST?
> 
> I'm pretty certain that is a common term for this movement, and that "twist"
> is a rather strange term ("roll" is used more). And Z has the advantage that
> it also implies that counter-clockwise is positive.

my main issue with Z is that it's not immediately clear what it refers to in
the context of a tablet. x/y is relative to the tablet itself, not the
stylus, so Z could be interpreted to be the same. twist isn't though, it
relates to the stylus rotation regardless of tilt.

Having said, I do like the term roll, better than twist.

Cheers,
   Peter

> 
> On 12/08/2014 09:59 AM, Jason Gerecke wrote:
> 
> >--- a/src/libinput.h
> >+++ b/src/libinput.h
> >@@ -277,7 +277,8 @@ enum libinput_tablet_axis {
> >  	LIBINPUT_TABLET_AXIS_PRESSURE = 3,
> >  	LIBINPUT_TABLET_AXIS_TILT_X = 4,
> >  	LIBINPUT_TABLET_AXIS_TILT_Y = 5,
> >-	LIBINPUT_TABLET_AXIS_CNT = LIBINPUT_TABLET_AXIS_TILT_Y + 1
> >+	LIBINPUT_TABLET_AXIS_TWIST = 6,
> >+	LIBINPUT_TABLET_AXIS_CNT = LIBINPUT_TABLET_AXIS_TWIST + 1
> >  };
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