G11: Shape Builder pieces: contract the sweep's stubs between two cuts of one path

Browse Source

Where two passes of a path (an open line's way there and back) cross another
path, the sweep can cut them a rounding error apart and join the two cuts
with a stub a little over its tolerance. Upstream's twin-piece joining
already merges the ends of the two passes, but not such stubs, so dense
hatches at exact binary steps (lines every 0.5 pt across a 45° line) still
came back with a speck of a piece per crossing. The planar map now contracts
such stubs into one vertex before the edges are built (within 4x eps up and
down the sweep's frame and 1/16 of the 0.01 pt precision along it), bounded
by each cluster's extent so a run of tiny, nearly level segments (a finely
flattened or traced path) is not collapsed transitively.

Ported from the fork's d5985b14 and 616a5c4a with their tests:
a_dense_hatch_at_exact_binary_steps_cuts_each_line_once_per_crossing (fails
without the fix), a_run_of_tiny_level_segments_is_not_contracted_as_stubs
(fails without the extent bound) and
a_line_crossed_where_its_two_passes_part_is_cut_once (already passing on
upstream, kept as a regression test).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014gCpjL3yUhaH3jRp7ksufh

...

This commit is contained in:

Angelo Bernardini

2026-10-24 08:05:47 +07:00

committed by bflatastic

co-authored by Claude Opus 5.5

parent c204d8959e

commit e11ff0352b

3 changed files with 137 additions and 2 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download Patch File Download Diff File Expand all files Collapse all files

docs/target-app-parity.md

+3 -1

File diff suppressed because one or more lines are too long