feat: add gridRadius prop for rounded grid corners - #216
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Rounds the corners of a path="grid" arrow. `gridRadius` uses strokeWidth * 2,
`gridRadius={12}` takes a radius in pixels, and the default `false` keeps the
square corners 2.1.0 draws. Closes the `// gridRadius //todo` that has sat next
to gridBreak since v2.
Named gridRadius rather than roundedCorners: it only applies to path="grid", so
it belongs to the same prop family as gridBreak, and a radius wants a number as
its primary type.
The corner math lives in a pure polylinePath helper so it can be tested without
a DOM. It is vector based rather than special cased per corner orientation. The
grid control points are axis aligned only by arithmetic coincidence, since the
head offset applied to cpx1/cpx2 cancels the shift applied to x2, so comparing
coordinates for equality would rest on two independently computed floats
matching exactly and would break for anyone using the _cpx1Offset escape
hatches.
Two failure modes the helper handles that a fixed offset does not:
- the radius is capped at half the shorter adjacent segment, so an arrow shorter
than twice the radius rounds as much as it can instead of emitting a point
behind the previous one and folding back on itself.
- repeated points are collapsed first. The hv and vh grid paths put the second
control point on top of the end point, and gridBreak="0%" puts the first on
top of the start; left in place they are zero length segments that make the
corner math divide by zero.
Netlify deploy previews now build Storybook and nest it under the demo, matching
the layout deploy-demo.yml publishes to Pages, so a preview can actually show
the story. The Storybook base moves out of the GITHUB_PAGES branch since it is
nested in both places, only under a different prefix.
Based on the approach in #178 by @andreac92.
Closes #43
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Included review availability: Your plan includes up to 3 reviews per rolling hour; 1 remains after this review. 📝 WalkthroughWalkthroughThe PR adds the ChangesGrid-radius feature
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The change is merge-ready after normal checks and review; no actionable merge-blocking risk remains. Sequence Diagram(s)sequenceDiagram
participant XarrowProps
participant GetPosition
participant polylinePath
participant SVG
XarrowProps->>GetPosition: pass gridRadius and strokeWidth
GetPosition->>polylinePath: provide grid points and radius
polylinePath->>SVG: return rounded path data
SVG-->>XarrowProps: render grid-path arrow
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Eliav2
marked this pull request as ready for review
August 16, 2026 18:43
Eliav2
marked this pull request as draft
August 16, 2026 18:43
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Inline comments:
In `@CHANGELOG.md`:
- Around line 5-8: Update the gridRadius changelog sentence to state that the
default false preserves the square corners drawn by version 2.1.0.
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CHANGELOG.mdREADME.md__test__/gridRadius.test.tsx__test__/polylinePath.test.tsexamples/.storybook/main.tsexamples/src/stories/XarrowGridRadius.stories.tsxnetlify.tomlsrc/Xarrow/useXarrowProps.tssrc/Xarrow/utils/GetPosition.tsxsrc/Xarrow/utils/index.tssrc/types.ts
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Storybook is published as a subpath of the demo on both Pages and Netlify, so the demo is the only place a visitor would find it from. BASE_URL covers both bases; the dev server is the exception, since `pnpm storybook` runs it as its own server on 6006. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Adds
gridRadius, which rounds the corners of apath="grid"arrow. Closes the// gridRadius //todothat has sat next togridBreaksince v2.Default is
false, so every existing grid arrow renders exactly as it does in 2.1.0.Based on the approach in #178 by @andreac92. Closes #43.
Preview
Netlify deploy previews now build Storybook and nest it under the demo, matching the layout
deploy-demo.ymlalready publishes to Pages. The demo also links to Storybook, since a subpath nobody links to is a subpath nobody finds.Three stories under gridRadius, at
<deploy-preview-url>/storybook/:gridRadius={40}with the boxes progressively closer. Corners should tighten and stay smooth; nothing should kink or double back.gridRadius,strokeWidthandgridBreakcontrols.Both bases were built and checked:
/storybook/on Netlify,/react-xarrows/storybook/on Pages. The demo link resolves correctly under each, and Storybook's own asset URLs follow.Why
gridRadiusand notroundedCornersIt is a no-op for
path="smooth"andpath="straight", so it belongs to the same prop family asgridBreakand thegridprefix says so. A radius also wants a number as its primary type;boolean | numberis there so baregridRadiusworks in JSX.Implementation notes
The corner math is a pure
polylinePathhelper insrc/Xarrow/utils/index.ts, so it is testable without a DOM.It is vector based rather than special cased per corner orientation. That is deliberate: the grid control points are axis aligned only by arithmetic coincidence — the head offset applied to
cpx1/cpx2cancels the shift applied tox2— so comparing coordinates for equality would rest on two independently computed floats matching exactly, and would break outright for anyone using the_cpx1Offsetescape hatches.Two failure modes it handles that a fixed offset does not:
hvandvhgrid paths put the second control point on top of the end point, andgridBreak="0%"puts the first on top of the start. Left in place they are zero length segments that make the corner math divide by zero.Rounding only ever pulls the path inward, staying inside the triangle formed by the corner and its two trim points, so the SVG canvas sizing in
GetPositionneeded no changes.Corners are quadratics with the control point at the corner, not true circular arcs. For the 90° corners a grid path produces the difference is sub-pixel, and it avoids computing arc sweep flags.
Tests
13 new tests. 65 pass in the library suite, 3 in the demo suite.
__test__/polylinePath.test.ts— the geometry: radius clamping (asserts x never decreases, which is the case Add roundedCorners prop #178 got wrong), inward-only curves, collapsed duplicate points, non-axis-aligned corners, degenerate input, noNaN.__test__/gridRadius.test.tsx— the wiring from prop to renderedd, withgetBoundingClientRectstubbed so the arrow gets real coordinates. jsdom otherwise reports every box as zero sized at the origin, which collapses the path to nothing.examples/src/__tests__/storybook-link.test.tsx— the demo's Storybook link. It is the only route into Storybook from the demo and nothing else would fail if a refactor dropped it.Not included
No version bump — that is a separate release step.
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Summary by CodeRabbit
gridRadiussupport for grid-path arrows, enabling square or rounded corners.gridRadiusbehavior and defaults.