[Bug]: Weird stroke behavior near input

[timkrief]

What happened?

A bug happened!

It seems like there is a really weird behavior with the stroke near the input the line is not static it feels like there are some data points missing or changing or something. It's easier to spot with large thickness, but it's always there.

It's not an aesthetic issue, it's a functional one, it messes the final stroke look.

Screen_Recording_20250109_034647_1.mp4

I inclueded a video to make it clearer.

Thanks for this app!

Version

2.2.3

Platform

Android

Relevant log output

Code of Conduct

• I agree to follow this project's Code of Conduct

[CodeDoctorDE]

Yes this is a Side effect of the stroke algorithm I use.

Can you try these values:

[timkrief]

Hi, I tried with a lot of different settings, here's with the settings you suggested:

Screen_Recording_20250109_120848_1.mp4

[timkrief]

Here's another example. this time it became really laggy at the end.

Screen_Recording_20250109_121911_2.mp4

Screen_Recording_20250109_121911_3.mp4

[CodeDoctorDE]

Hmm i see, but im currently not really familiar with the algorithm to fix this.
If you want to look at this, im using the perfect freehand library https://github.com/steveruizok/perfect-freehand-dart

[timkrief]

Noted, I'll take a look 🙂

[CodeDoctorDE]

Thanks, i see you also have a programming background. I dont know if the library authors accept pull requests. If not, we could make a fork out of this

[CodeDoctorDE]

Some more info if you want to work on that:
I'm using the exact library version CodeDoctorDE/perfect-freehand-dart@6228363 (which is the same 2.3.2 as on pub.dev except I just have it as git dependency).

This is the part of the code which calculates how the points looks like:

Butterfly/app/lib/renderers/elements/path.dart

Line 116 in c24d6f8

var outlinePoints = freehand.getStroke(