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Live Corners: a corner rounds until its cut reaches its neighbours (#2332)

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A corner's radius was capped at half its shorter side whatever its neighbours did, so one corner of a 100 pt square rounded alone stopped at 50 pt. Each corner now rounds until its cut reaches the cuts its neighbours ask for: the whole side when the neighbour is square, halfway when both ask for more. The corner widget drag, the red limit outline and CSS border-radius export follow the same limit.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
vangel76
2026-10-17 13:20:26 +07:00
committed by bflatastic
co-authored by Claude Opus 5.5
parent 0746519517
commit 8875b3fbca
7 changed files with 192 additions and 36 deletions
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crates/svg/src/css.rs
+3 -3
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@@ -622,9 +622,9 @@ fn corners(path: &PathData, live: Option<&LiveShape>) -> Option<Corners> {
Some(LiveShape::Rectangle { w, h, radii, kinds, xf })
if upright(xf) && radii.iter().zip(kinds).all(|(r, k)| *r <= 0.0 || *k == CornerKind::Round) =>
{
// The radii as drawn, none past half the shorter side (CSS draws one further when its
// neighbours leave room).
let radii = radii.map(|r| shapes::fitted_corner_radius(*w, *h, r));
// The radii as drawn: no two neighbours' cuts add up to more than their side, so CSS
// draws them as they are.
let radii = shapes::fitted_corner_radii(*w, *h, *radii);
if radii.iter().all(|r| *r <= 0.0) {
Some(Corners::Square)
} else if radii.iter().all(|r| (r - radii[0]).abs() < 1e-9) {