Hi,
On 17-04-15 13:17, Michal Suchanek wrote:
On 17 April 2015 at 12:52, Hans de Goede <hdego...@redhat.com> wrote:
Hi,
On 17-04-15 11:47, Michal Suchanek wrote:
On 17 April 2015 at 09:11, Pekka Paalanen <ppaala...@gmail.com> wrote:
On Fri, 17 Apr 2015 13:43:11 +0900
x414e54 <x414...@linux.com> wrote:
Thank you for the comments.
I do have a few counterpoints but I will leave after that.
Not sure an IR/laser/wii mote pointer should even be considered a
"relative" pointer since they operate in absolute coordinates. Given
this, there is no "set position" hint to consider. Transmitting
acceleramoter data via a "relative pointer" doesn't sound reasonable.
I think this is the issue right here. Pointers are not relative, mice
are not pointers.
What definition of a "pointer" are you using?
The definition Wayland uses for a wl_pointer is a device that:
- requires a cursor image on screen to be usable
- the physical input is relative, not absolute
This definition is inspired by mice, and mice have been called pointer
devices, so we picked the well-known name "pointer" for mice-like
devices.
Specifically, a pointer is *not* a device where you directly point a
location on screen, like a touchscreen for example. For touchscreens,
there is a separate protocol wl_touch.
For drawing tablets, there will be yet another procotol.
Joysticks or gamepads fit into none of the above. For the rest of the
conversation, you should probably look up the long gamepad protocol
discussions from the wayland-devel mailing list archives.
And how is a joystick different from a trackpoint, exactly?
It uses different hardware interface and later different software
interface but for no good reason. It's just 2 axis relative input
device with buttons. Sure, the big joystick, gamepad directional cap
and trackpoint are at a different place of the stick size scale and
might have different hardware sensors which should be reflected with
different acceleration settings but ultimately it's the same kind of
device.
Actually joystick analog inputs are absolute not relative. They give a value
for exactly how much the "stick" has moved from the center.
Except for dpads which are really buttons not relative axis, so joysticks
really are pretty much not like trackpoints in anyway.
Do you mean that the absolute trackpoint excentricity is somehow
translated to relative motion delta in hardware so that it does look
like a mouse although it is in fact a joystick?
Yes.
Also have you ever used a trackpoint it is really nothing like a joystick,
with a joystick you move the stick and then it stays in position (there
are springs to center the stick when you let go, but you can remove those
and everything will still work just fine).
Where as a trackpoint is more of a presure sensor which senses how much you
push against it in a certain direction, it does not actually move.
They are really just completely different beasts.
Regards,
Hans
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