The Live Paint Bucket now fills areas enclosed by any paths. Crossing
lines enclose faces it can fill, a line across a shape splits that shape's
face in two, and an area enclosed by paths becomes a face even when nothing
fills it (it starts unfilled). Edges are the paths cut wherever another path
meets them, keeping their stroke, so Shift-click paints each piece. Closed
shapes give the same faces as before.
Root cause: Live Paint built its faces from the Pathfinder regions, which
divide the filled areas of closed shapes. An open path counted only as the
area it would fill if closed, which for a straight line is nothing, so lines
divided nothing and the bucket found no face to fill. A new planar map in
vectorcraft-pathops (live_paint) sweeps every path as an edge: an open path
goes in traced there and back, with crossing counts that never cancel; faces
are walked on the resulting graph (holes included), and their fills and the
edges' sources are found geometrically. The sweep runs in an exactly sheared
frame, because it mishandles a horizontal line traced there and back.
Make, Merge, the bucket and Live Paint Selection all use it;
interior_point moves to vectorcraft-pathops with it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
regions() made one linesweeper contour pass per distinct coverage mask,
and each pass walks the whole arrangement, so finding the regions cost
masks x segments. Two crossing blends make thousands of both: the
Ribbons example's EPS export never finished, and Flatten Transparency,
the Flattener Preview, Divide, Shape Builder and Live Paint slowed down
the same way on dense art.
The masks now go into batches whose faces share no vertex (a greedy
colouring of the masks meeting at each vertex), one contour pass per
batch. A face's contours are walked as in its own mask's pass, since
no other face of the batch touches it; each contour's mask is the one
of its batch at its first point (a vertex of the arrangement), and
contours group under the nearest enclosing contour of the same mask,
as grouped() does in that mask's pass. The regions come out identical,
in the same order.
Fixes#173.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01U9TrG4w49oSRYbP3cqxA3D
Shipped code no longer unwraps, expects or panics: every one of the 124
unwrap()/expect()/panic!/unreachable! sites outside tests now handles the
failure (Result/Option, ?, let-else, defaults) and reports errors to the user.
- Lints: workspace clippy denies unwrap_used, expect_used, panic, todo,
unimplemented and unreachable; clippy.toml allows them in tests, and
integration tests, examples and testkit opt out explicitly.
- Safety net (vectorcraft_engine::guard): a panic in a top-level command rolls
the document back and returns EngineError::Internal; a panicking tool is
reset; the MCP server answers with an internal error and keeps serving; the
UI frame and each control request are guarded.
- APIs that hid failures now return them: Rendered::to_png/to_jpeg/to_webp
return Result (JPEG/WebP errors used to write empty files),
FontDb::face returns Option, Region::top returns Option.
- Fuzzing: engine/tests/import_fuzz.rs feeds garbage, hostile and mutated SVG
and PDF through import → render → export (30k cases locally, no panics).
- Docs: AGENTS.md/CLAUDE.md rule, docs/development.md "Robustness" section,
README pointer and a PR template checklist.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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>
Outline Stroke (and the stroke part of Expand) now builds each stroke from the
shared canvas geometry: dash shapes, arrowheads, width profiles and inside/outside
alignment, united into one clean path (pathops::stroke_region). Every stroke item
is outlined in paint order (runs of fills stay on copies of the path), stroke
opacity, blend mode and effects move to the new fill, and brushed strokes become
their brush art. The live Effect > Path > Outline Stroke outlines the stroke it
sits on (on a fill or the object: the top stroke) with that stroke's cap, join,
dashes, alignment, profile, arrowheads and weight: GeomContext now carries the
stroke and the fill rule, built per item by the renderer, export baking and
Expand Appearance.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
bflatastic
theironchef
Brandon Thomas