Input smoothing / post-processing

[intelfx]

It would be nice if satty could implement mouse input post-processing (e.g. smoothing) similar to the way Windows snipping tool "prettifies" the mouse-drawn input.

Compare (deliberately sloppy) attempts to draw an ellipse with a laptop touchpad with Satty and with Windows 10 snipping tool (Win + Shift + S):

Satty:

Windows 10 snipping tool:

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Note that this Windows 10 instance is running in a VM using host input, so there should be no difference due to e.g. touchpad drivers — the Windows app received exactly same input events as a Linux application would have in its place.

[gabm]

nice idea, i fully support this. Do you have any algorithmic reference for this?

If you want to work on that, I can give you a headstart!

[intelfx]

Do you have any algorithmic reference for this?

No, I do not, sadly, otherwise this would have been a PR instead of an issue :)

[00-kat]

Grabbing a bunch of points and drawing a spline through them might work. I don't know how it's actually done though, this is just a guess.

[vimmerru]

Do you have any algorithmic reference for this?

Seems here is the solution https://google.github.io/ink-stroke-modeler/. You can check rnote for reference of usage for this case.