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Expand stroke: compact plain stroke spines before outlining

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Squashed from #3457 onto main.
This commit is contained in:
bflatastic
2026-10-22 02:21:59 +07:00
parent 19c7d61f8a
commit dd2f5da98c
3 changed files with 104 additions and 0 deletions
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crates/pathops/tests/ops.rs
+14
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@@ -294,6 +294,20 @@ fn outline_stroke_of_line() {
assert!(close(ar(&o), 216.0, 1e-6));
}
#[test]
fn outline_stroke_of_straight_line_with_round_caps_is_compact() {
let l = PathData::single(SubPath::polyline(&[Point::new(0.0, 50.0), Point::new(100.0, 50.0)], false));
let o = outline_stroke(&l, 10.0, Cap::Round, Join::Round, 4.0);
assert!(close(ar(&o), 100.0 * 10.0 + PI * 5.0 * 5.0, 1e-3), "{}", ar(&o));
let anchors = o.subpaths.iter().map(|s| s.anchors.len()).sum::<usize>();
assert!(anchors <= 8, "round-cap expand should stay compact, got {anchors} anchors");
let dense: Vec<Point> = (0..=20).map(|i| Point::new(i as f64 * 5.0, 50.0)).collect();
let dense_path = PathData::single(SubPath::polyline(&dense, false));
let dense_o = outline_stroke(&dense_path, 10.0, Cap::Round, Join::Round, 4.0);
let dense_anchors = dense_o.subpaths.iter().map(|s| s.anchors.len()).sum::<usize>();
assert_eq!(dense_anchors, anchors, "colinear spine points should not add outline anchors");
}
#[test]
fn outline_stroke_of_square_is_ring() {
let o = outline_stroke(&rect(0.0, 0.0, 10.0, 10.0), 2.0, Cap::Butt, Join::Miter, 10.0);