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Path ops: Offset Path turn test describes the cases it checks

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The comment on the zigzag cases said the open zigzag grown by 1.5 leaves
stroker loops whose faces the distance test drops. With the turned branch's
distance test measuring points in the turned frame, or dropping no face at
all, the three zigzag cases still pass and only the plate case fails (201
contours instead of 101). The comment now says what the zigzag cases check:
one turn for the low path, none for the path stood on end, and the same
region from both. The plate comment says its narrow holes are dropped by
the distance test measured at points turned back into the plate's frame.
This commit is contained in:
dotCooCoo
2026-11-13 21:59:20 -08:00
parent 1e4e3534f5
commit 76f07a626e
1 changed files with 5 additions and 3 deletions
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crates/pathops/src/sweep_axis.rs
+5 -3
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@@ -259,8 +259,9 @@ mod tests {
#[test]
fn offset_path_sweeps_a_long_low_path_turned_with_the_result_of_the_path_on_end() {
let mut rng = Rng(17);
// Grown past the zigzag's bends, where the stroker leaves loops whose faces are dropped by
// the distance test; grown a little; and inset.
// An open zigzag grown by 1.5, a closed one grown by 0.5 and a closed one inset by 0.3. Each
// is swept turned when low and as it is when stood on end, and the two results cover the
// same region. None of the three leaves a face for the distance test to drop.
for (closed, delta) in [(false, 1.5), (true, 0.5), (true, -0.3)] {
let what = format!("closed {closed}, offset {delta}");
let low = zigzag(3, 300, 0.4, &mut rng, closed);
@@ -274,7 +275,8 @@ mod tests {
assert_same_region(&turned, &upright(&on_end), &what);
}
// A long plate with a row of round holes: growing it by 1 closes the narrow holes, which
// the distance test drops, and keeps the wide ones.
// the distance test drops when it measures each hole's point turned back into the plate's
// own frame, and keeps the wide ones.
use kurbo::Shape;
let mut plate = kurbo::Rect::new(0.0, 0.0, 4000.0, 20.0).to_path(0.1);
for i in 0..200u32 {