On Wed, Mar 7, 2012 at 2:18 PM, Nikolai Kondrashov <spbn...@gmail.com> wrote: > Hi everyone, > > Today I've started implementing a driver for Waltop Sirius Battery Free > tablet. As it turns out, it reports pen tilting, which is a rare thing for > non-Wacom tablets! > > Could someone please explain what ABS_TILT_X and ABS_TILT_Y event values are > supposed to mean? What are the units and ranges? > > Also, what the X applications are expecting as tilting valuator values? > > My expectation was that the values match the HID usage tables spec > description of "X Tilt" and "Y Tilt" usages (see 16.3.2 Tilt Orientation). > I.e. positive/negative fractions of the X/Y arcs, which probably cover 90 > degrees both ways, since nobody is looking at the resolution. Interestingly > enough, the spec says positive inclination is bottom right corner, but the > tablet assumes top right. > > However, after reading xf86-input-wacom sources I got somewhat confused. > > Could someone clarify this? >
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... 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. Hopefully, those missing degree's aren't hard coded in apps such as gimp! Chris ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Linuxwacom-devel mailing list Linuxwacom-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxwacom-devel
