Re: [Linuxwacom-discuss] Wacom Intuos3 / Debian Stretch / Tilt values wrong in relative mode

[Hanns H. R. <co...@sc...>]

I mean -- to elaborate: the relative mode works perfectly on macOS, with
the assumed operation: relative coordinates, absolute pressure and tilt.
If an application uses tilt and pressure, it would have to assume
absolute values. So even if there is only a "global" mode, that mode can
only be interpreted as relating to coordinates.


On 09/01/18 09:10, Hanns Holger Rutz wrote:
> Hello,
> 
> thanks for the answers. But as I said, you cannot do _anything_ useful
> with relative/integrated tilt because the values are meaningless, so I
> can't imagine any application using those values. Or am I missing some
> use case?
> 
> Would it be possible to fix this issue?
> 
> Best, .h.h.
> 
> 
> On 09/01/18 04:34, Peter Hutterer wrote:
>> On Mon, Jan 08, 2018 at 12:00:19PM -0800, Jason Gerecke wrote:
>>> My apologies for the delay in replying --
>>>
>>> When the tablet is switched to relative mode, it seems that all axes
>>> (not just X and Y) begin emitting relative data. This appears to be
>>> intentional, however: commit 49d7635e19 introduced this behavior,
>>> noting that "the [axis value] builds up to the maximum and stays
>>> there, even when the pen is lifted off the tablet." It links to
>>> https://sourceforge.net/p/linuxwacom/bugs/156/ which suggests leaving
>>> the pressure/tilt/etc. values absolute and only making the X and Y
>>> axes relative. Why this suggestion was not acted on, I'm not sure...
>>> Perhaps applications assume(d) that all axes were absolute or
>>> relative, and so having a device "partially relative" caused problems?
>>
>> I think this was the issue. In the XI 1.x protocol you only have a device
>> mode, not a per-axis mode (that's XI2, but well, backwards compatibility
>> guarantees we can never use it). So you can't have one axis as relative and
>> one as absolute, no way to tell the client that's the case. And the mode is
>> device-global (with no event, iirc).
>>
>> Cheers,
>>    Peter
>>
>>> I'm pinging the person who made that change to see if they can
>>> remember anything, but its been this way for an awfully long time...
>>>
>>> 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....
>>>
>>>
>>> On Mon, Jan 8, 2018 at 2:14 AM, Hanns Holger Rutz <co...@sc...> wrote:
>>>> ping...
>>>>
>>>> On 21/11/17 13:40, Hanns Holger Rutz wrote:
>>>>> hi,
>>>>>
>>>>> I don't know if this is the right place to ask (if not, please kindly
>>>>> point me to a better forum) -- I'm having problems with a Wacom Intuos3
>>>>> on Debian Stretch; whenever I use relative coordinate mode, the tilt
>>>>> values are fluctuating more or less randomly and not correctly
>>>>> initialised when I approach the tablet with the stylus; it seems there
>>>>> is a bug that tries to apply some "relative integration" to the tilt
>>>>> values as well, which of course is wrong.
>>>>>
>>>>> Is this a known issue?
>>>>>
>>>>> Best, .h.h.
>>>>>
>>>>
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> 
> 
> 
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