Drawing "Freehand" with a stylus pen zooms in-and-out at the same time

[balkanez]

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• [x] I agree to follow the Code of Conduct that this project adheres to.
• [x] I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Describe the bug When drawing "Freehand" with a stylus, erratic and unexpected zoom-ins happen. For an example: it is almost impossible to write 3 times a letter "A" without zooming in aggressively. It draws a line and zooms in-and-out at the same time. Shapes like "A", "N" and "M" are most problematic. It doesn't matter if the palm is touching the screen or just the stylus tip - the behavior is the same. It seems that every 3rd-5th line is interpreted as pinch zoom at the same time.

To Reproduce

• Using Microsoft Surface GO 2, touchscreen and stylus enabled.
• Drawing "Freehand" with the pen.
• Writing anything with the pen..

Expected behavior Zoom level stays the same while drawing freehand with a stylus pen.

• draw.io version 21.8.2

Desktop (please complete the following information):

• OS: Windows 11

Additional context The problem is the same whether it is a Windows Desktop app, online web app or VS Code plugin.

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And a big thank you for a powerful and free graph drawing software!

[balkanez]

https://github.com/jgraph/drawio-desktop/assets/34673712/4f03590a-0518-4705-9a55-5f508ad42a37

A video of zooming behavior when writing/drawing.

[balkanez]

Hi, I just wanted to confirm that the weird behavior is still the same in latest version 22.0.3 Freehand drawing with the stylus on Microsoft Surface GO 2 is unusable because of zoom-ins.

[alderg]

Did you rest the palm of your hand on the screen while drawing with the pen? If yes, can you check if this happens without resting the palm of the hand on the screen?

[balkanez]

Sorry for not answering promptly, I haven't had the device with me for a long time.

The version is 22.1.2. It still does the same thing.

Video shows the behavior:

1. no palm on the screen, just the pen tip
2. palm resting on the screen
3. drawing with finger

https://github.com/jgraph/drawio/assets/34673712/1418c82d-1f95-46c9-bd1b-ff0b8edbfc12

[hunklin]

I also meet this issue in my Android Tablet freehand drawing & Win11+ Wacom pen freehand drawing. It is pretty annoying when I use pen to draw .....

[hunklin]

@alderg to add more details about reproducing this in latest web version(v22.1.16)

• In my Android Tablet + sketch Theme, when click freehand tool.

  1. use my finger to draw the first line. It is OK
  2. use my finger to draw the second or more free lines. Unexpected zoom in/zoom out sometimes happen when my finger moves vetically.

• I also reproduce this issue in win11 + Wacom stylus pen + sketch Theme. It is less frequency than tablet but it still happens.

• If I use win11 + mouse + sketch Theme, i don't see this issue.

Thanks a lot for looking into this bug. I often share my screen when I do the drawing in presentation, so it will impact the viewer a lot.

[yung2004]

I have same issue, I am using Windows 10 and UGEE Drawing Tablet S640W

[Papariggi]

I have the same issue using draw.io version: 24.2.5 OS: Windows 11 device: Lenovo Yoga 7i

[PaulB-H]

I have the same issue, but I found a workaround.

Enabling "Mouse Mode" instead of "Pen Mode" in my Wacom settings stops the zoom bug.

Windows 10 Draw.io: 24.6.4 Wacom Bamboo (Very old)

[PaulB-H]

Another solution instead of using "Mouse Mode":

Disable "Windows Ink" if your tablet settings let you.

This fixed the zoom bug, and I can still use "Pen Mode". Since Windows Ink is a newer API for pen support in windows, it may cause the pen to not work in other apps that require it and don't support wintab.