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H-M-H / Weylus

Use your tablet as graphic tablet/touch screen on your computer.
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Pen Eraser #104

Open mfauvain opened 3 years ago

mfauvain commented 3 years ago

I am using a surface Go and surface pen as weylus input. Pen works perfect, but eraser is not recognized as such. Am I missing something or is it not implemented yet?

H-M-H commented 3 years ago

Using the eraser is implemented but I suspect your pen doesn't actually have an eraser (typically located at the back of the pen) but just a button (typically located at the side of the pen) and unfortunately such buttons are hard to deal with. Also see #66. Please run Weylus like this WEYLUS_LOG_LEVEL=TRACE ./weylus, use your pen and especially the eraser and paste the output here.

mfauvain commented 3 years ago

It does. xinput list on the surface gives

⎡ Virtual core pointer                      id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ ELAN9038:00 04F3:261A Stylus stylus       id=8    [slave  pointer  (2)]
⎜   ↳ ELAN9038:00 04F3:261A Stylus eraser       id=9    [slave  pointer  (2)]
⎜   ↳ ELAN9038:00 04F3:261A touch               id=10   [slave  pointer  (2)]
⎣ Virtual core keyboard                     id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Video Bus                                 id=6    [slave  keyboard (3)]
    ↳ Power Button                              id=7    [slave  keyboard (3)]
    ↳ Intel HID events                          id=12   [slave  keyboard (3)]
    ↳ Intel HID 5 button array                  id=13   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=14   [slave  keyboard (3)]

However on the weylus 'server' I see

Virtual core pointer                        id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ Apple SPI Touchpad                        id=11   [slave  pointer  (2)]
⎜   ↳ Weylus Mouse - 192.168.1.193:52452        id=12   [slave  pointer  (2)]
⎜   ↳ Weylus Touch - 192.168.1.193:52452        id=15   [slave  pointer  (2)]
⎣ Virtual core keyboard                     id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Video Bus                                 id=7    [slave  keyboard (3)]
    ↳ Power Button                              id=8    [slave  keyboard (3)]
    ↳ Sleep Button                              id=9    [slave  keyboard (3)]
    ↳ Apple SPI Keyboard                        id=10   [slave  keyboard (3)]
    ↳ Weylus Stylus - 192.168.1.193:52452       id=13   [slave  keyboard (3)]
    ↳ Weylus Keyboard - 192.168.1.193:52452     id=14   [slave  keyboard (3)]

and in mypaint for ex I have 2021-08-04_15-02

running in debug mode I have

Aug 04 16:12:26.246 TRACE weylus::websocket: Got: PointerEvent { event_type: MOVE, pointer_id: 1, timestamp: 23721800, is_primary: true, pointer_type: Mouse, button: NONE, buttons: PRIMARY, x: 0.6263440860215054, y: 0.5714285714285714, movement_x: -1, movement_y: 4, pressure: 0.5, tilt_x: 0, tilt_y: 0, twist: 0, width: 0.0007437183099083297, height: 0.0007437183099083297 }
Aug 04 16:12:26.270 TRACE weylus::websocket: Got: PointerEvent { event_type: MOVE, pointer_id: 1, timestamp: 23734800, is_primary: true, pointer_type: Mouse, button: NONE, buttons: PRIMARY, x: 0.6263440860215054, y: 0.5723214285714285, movement_x: 0, movement_y: 1, pressure: 0.5, tilt_x: 0, tilt_y: 0, twist: 0, width: 0.0007437183099083297, height: 0.0007437183099083297 }
Aug 04 16:12:26.274 TRACE weylus::websocket: Got: PointerEvent { event_type: MOVE, pointer_id: 1, timestamp: 23755800, is_primary: true, pointer_type: Mouse, button: NONE, buttons: PRIMARY, x: 0.6290322580645161, y: 0.5678571428571428, movement_x: 2, movement_y: -5, pressure: 0.5, tilt_x: 0, tilt_y: 0, twist: 0, width: 0.0007437183099083297, height: 0.0007437183099083297 }
Aug 04 16:12:26.285 TRACE weylus::websocket: Got: PointerEvent { event_type: MOVE, pointer_id: 1, timestamp: 23770800, is_primary: true, pointer_type: Mouse, button: NONE, buttons: PRIMARY, x: 0.6290322580645161, y: 0.5660714285714286, movement_x: 0, movement_y: -2, pressure: 0.5, tilt_x: 0, tilt_y: 0, twist: 0, width: 0.0007437183099083297, height: 0.0007437183099083297 }
Aug 04 16:12:26.291 TRACE weylus::websocket: Got: PointerEvent { event_type: UP, pointer_id: 1, timestamp: 23770800, is_primary: true, pointer_type: Mouse, button: PRIMARY, buttons: NONE, x: 0.6290322580645161, y: 0.5660714285714286, movement_x: 0, movement_y: 0, pressure: 0.0, tilt_x: 0, tilt_y: 0, twist: 0, width: 0.0007437183099083297, height: 0.0007437183099083297 }
mfauvain commented 3 years ago

I've noticed as well that pressure/tilt/twist do not change. when I do 'write' pressue is 0.5. And 0 when I just hover above the Surface screen. Here is a more complete log file. weylus.txt

H-M-H commented 3 years ago

Thanks for the detailed logs! I am afraid but it looks like your browser doesn't recognize the eraser as such. Instead it considers it as primary button and sadly the specifications say that primary button means pen contact as well and not just primary button has been pressed and there is no way to distinguish pen contact and the pen button/eraser. Regarding tilt and pressure: Looks like your browser or your pen don't support those and some reasonable defaults are provided.

mfauvain commented 3 years ago

I see.. any browser you know (linux) that does support eraser/tilt/pressure?

H-M-H commented 3 years ago

I only know that Firefox does not handle things properly: https://bugzilla.mozilla.org/show_bug.cgi?id=1501744 https://bugzilla.mozilla.org/show_bug.cgi?id=1324956

I do not know about chrome/chromium but that is probably the only browser that might have support.

mfauvain commented 3 years ago

I tried Chromium, no luck. Thx.

mfauvain commented 3 years ago

Maybe just valid for pressure, but you might be able to make use of this javascript https://pressurejs.com/index.html#examples I tried it on linux Chromium/Chrome and pressure is correctly detected.

matthewswar commented 1 year ago

I have a Surface Go with the pen and my eraser also wasn't working. I tried to dig into the code and found that if I flipped this bit from a 0 to a 1, it started working! I can use the pen tip for writing and the eraser for erasing. I'm not familiar with the code base, but it seems like setting EC_KEY_TOOL_PEN to 0 effectively turns the pen writing and erasing state off for the Surface Go pen.