On 03/08/2012 12:10 AM, Chris Bagwell wrote:
> I do not have a tablet with tilt, nor experience on how userland uses
> it. And probably I should have read that HID section before replying
> but...
Here is that part in full, for your reference:
16.3.2 Tilt Orientation
X Tilt and Y Tilt are used together to specify the tilt away from
normal
of a digitizer transducer. In its normal position, the values of X Tilt
and Y Tilt for a transducer are both zero. The X Tilt/Y Tilt
orientation
of a system does not specify the rotation of the transducer around its
own normal axis.
X Tilt DV – This quantity is used in conjunction with Y Tilt to
represent the tilt away from normal of a transducer,
such as
a stylus. The X Tilt value represents the plane angle
between the Y-Z plane and the plane containing the
transducer axis and the Y axis. A positive X Tilt is to the
right.
Y Tilt DV – This value represents the angle between the X-Z and
transducer-X planes. A positive Y Tilt is toward the user.
> I do see all Wacom tablets with Tilt support report tilt X/Y declaring
> a value between 0 and 127. I also see these tablets advertised on web
> with Tilt Range of +/- 60 degrees. So I'm going to take a wild guess
> since 60 + 60 ~= 127 the units are degrees.
Thanks, Chris!
> Hopefully, those missing degree's aren't hard coded in apps such as gimp!
My guess is that nobody is relying on specific angles, at least yet, but
instead focuses on the feel of it. Still, I'd like to match expected values.
Sincerely,
Nick
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