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Such lib is not hard to write. Somewhat limiting but simple version could just be a Canvas API wrapper that breaks down lines and curves into smaller lines then jiggle the points randomly before rendering the points out using Catmull-Rom to Bezier spline conversion.

Complicated part is in intelligent fragmentation and jiggling based on hand velocity and hand muscle modeling but it's pretty easy to get decent result. Another technique to combine this with is drawing each path more than once but, like bold fonts, result is not as generally useful.




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