GetOffsetPerimeterEntities/GetOffsetPartEntities feed directional-distance
loops (FillLinear, Compactor, RotationSlideStrategy) that handle arcs
natively. Switching them to Clipper line output (plan option B) made
OpenNest.Tests run 48s -> 8m19s, Fill tests ~3x slower, and broke 20
exact-fit tests through tessellation and conservative padding, so they keep
the per-entity offset (option A), hardened:
- Arc, Circle and Line offsets are now side-symmetric. Right on a CCW arc
shrank instead of growing, Right on a CW circle grew, and Right on a line
offset to the left and reversed it. Only Left was used on hot paths, so
this was latent (SimplifierViewer drew both tolerance bands on one side).
- Shape.OffsetEntity closes every gap between consecutive offset pieces:
convex non-tangent line/arc corners get a round join about the original
corner, lines across a collapsed fillet are mitered, and any other gap
(concave arc corner, collapsed entity) is bridged with a line. Before,
only line-line corners were joined, so a vertex could slip through.
- Zero-area spikes are left in place and documented: they lie inside the
offset envelope, which is harmless for directional distance.
- OffsetOutward/OffsetInward become internal; PartGeometry is their only
caller.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
ajandClaude Opus 5.5
01789c5929