Turns out that coordinates-of-chord-and-radius is a better API for drawing arc segments than either start/end angle or chord-and-coordinates-of-center-point. Makes the implementation of round joins and caps almost trivial…
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raqote has a simple implementation of round joins and caps that uses no trig: github.com/jrmuizel/raqot. I'm not sure how it compares to what pathfinder is doing. It just uses the normals.
