be7006ccf5
The sweep compares a curve with another segment over a y-span shorter than its tolerance by bounding boxes only, so an edge rising by less than that tolerance (e.g. a rectangle edge cut through a circle's cap, whose computed intersection end sits ~1e-12 off the horizontal) was mis-ordered and the result lost a corner: xor/difference/area disagreed by up to 10%. Every sweep input now snaps on-curve y values within the tolerance to one level (handles follow and are levelled with their anchor), so such edges become exact horizontals, which the sweep handles exactly. - tests/regressions.rs: the six minimal failures found by the properties, the root cause in isolation, and the self-crossing "star" polygon. - The star-polygon strategy rejected no angular step of half a turn or more, so it sometimes drew self-crossing polygons (the shoelace failure). - Property suites run from a fixed seed (PROPTEST_CASES / PROPTEST_RNG_SEED still override), so CI cannot fail at random. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> |
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