1447580 - [Pointer Events] [Pen]Pointer Devices that identify as mouse (but are not an actual mouse) log wrong coordinates

Status: UNCONFIRMED

(Core :: DOM: UI Events & Focus Handling, defect)

Description

[nik.kyriakides]

Attachment: actual-result.png

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36

Steps to reproduce:

- Use Firefox 59 or Firefox 60 on Windows 10+.
- Created a canonical, simple, freehand-drawing canvas app (for test-case).
- Use a Wacom Pen Tablet/Digitiser.
- Turn "Windows Ink" off. Go to Start -> Wacom Tablet Properties -> "Mapping" tab -> Uncheck "Use Windows Ink". This causes the pointer to identify as `pointerType === 'mouse'` within Firefox, for the PointerEvents API.
- Open this JSFiddle: https://jsfiddle.net/d2gxjdva/190/
- Draw circles with your mouse. Try to draw a bit fast.


Actual results:

- Circles have knots in intermittent intervals. They produce irregular peaks. 
- e.clientX, e.clientY values are not always accurate. They sometimes produce back steps. See attached file 'actual-result.png'.
 


Expected results:

- Circles are do not have irregular knots.
- See attached file 'expected-result.png'.

Comment 1

[nik.kyriakides]

Attachment: The expected result. Circles are "knot-free"

Comment 2

[nik.kyriakides]

Although I've posted this bug report from a Mac, this bug is only applicable on Windows 10.

Comment 3

[David Olah]

I tried to reproduce the issue following the steps from comment 0 on a Microsoft Surface Pro 4 (we don't own a Wacom Tablet) and didn't managed to reproduce.

Based on the nature of the bug, I think this belongs to Event Handling component.

Comment 4

[nik.kyriakides]

(In reply to David Olah from comment #3)

The pen needs to report no pressure for this bug to take place. Turning off Windows Ink on Wacom's causes the device to identify as a Mouse.

Comment 5

[solrac]

Bug still existst on FF Quantum 66.0.2 (64-bit).

Can confirm as owner of a CTH-470 BAMBOO Tablet, using Windows Ink results on not beign able to draw because scrolling takes place, a workaround is to use the Pen's button instead.