dotCooCoo d5004b7dae Fix #3437: Spiral segments follow the spiral ...

The Spiral tool places its anchors on a logarithmic spiral, with the
radius shrinking by the decay each quarter turn, but gave every handle
the direction of a circle's tangent and a length from an averaged
radius. The curve bulged off the spiral between anchors and turned at
each anchor, so the spiral looked squared: up to 2.8% off its radius at
the default 80% decay and 23% at 30%.

The handles now follow the spiral's own tangent, with lengths that
differ at each segment's outer and inner end. The curve stays within
0.03% of the spiral at 80% decay and 0.8% at 20%. Anchor positions and
counts are unchanged.

2026-11-01 14:42:42 -08:00

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src

Fix #3437: Spiral segments follow the spiral

2026-11-01 14:42:42 -08:00

tests

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Cargo.toml

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