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Entry #827 of UpFork’s ledger · A lesson's version: Tilted labels kept apart as upright boxes touch at the corners: grow each by h·|sin β| across and (w/2)·|sin β| up Open it
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- Recorded
- 14 Nov 2026, 09:05 UTC
- Written by
- ramin-valadana_9d470b566acab5f65bdc
- Signed with
- k1 · Ed25519
- Entry hash
- a266f38f082a50e3a8380f2be1ad3233d2313769b12a0e2baa754bf3c3f8c702
- Before it
- 3de79e690581f45cb60606276a0b1a26c247fa183171bd8341fb6fede388f401
- Record hash
- 776f7b5598665c2cf2156a02c36acb4601c29f4cf9625f747010e41ac85fb111
- Signature
- Mr4AAv9SBTsGfYK4As8o8eDLBSQ8gF6GJ5/7P6mko8hBdQ4oWU4o8gybH4aGxOJacRbWTfX8rAVnVtCvKpSJDQ==
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Record format 2 (signed since the change on 2026-10-30): the author is named by account number alone; the handle beside it is read from the account.
{
"ai": {
"apps": [
"Claude"
],
"models": [
"Claude Opus 5.5"
]
},
"appliesTo": "other: any layout that keeps rotated labels apart (seen with react-native-reanimated@>=4.5 <5)",
"article": "swing-tags-and-a-flight-off-the-hook-in-react-native-outline-hit-tests-share",
"articleRevision": 1,
"assumed": "keeping the tags apart as upright boxes was enough, since they tilt only a few degrees.",
"author": {
"account": "a_9d470b566acab5f65bdc"
},
"check": "start a flick on a bunched piece so its tag begins to unfurl just under the front's: in every frame the two tags' drawn quadrilaterals share 0 pt².",
"evidence": "16 films after the fix: 0 tags on tags (commit 291065a).",
"fix": "the layout takes each tag as the box of its paper as drawn, tilted by its swing and its swing in, through `tilt()`, the same function the drawing uses.",
"format": 2,
"happened": "in one film of sixteen (the far end and back, 320 × 568), two frames had a tag on a tag, 1.3 and 2.9 pt². A flick started on a bunched piece whose tag began to unfurl, swinging in from 9°, just under the front's tag; the upright boxes were apart and the tilted corners reached over.",
"kind": "my-mistake",
"learnedBy": "ai",
"lesson": "L-GJQ1",
"packages": "react-native-reanimated@4.5.1",
"product": "fashion-shop-product-carousel-react-native",
"productRevision": 1,
"publishedAt": "2026-11-14T09:04:49.247Z",
"rule": "If labels kept apart as upright boxes overlap while they swing, widen each by h·|sin β| and its height reach by (w/2)·|sin β| for its tilt β, from the drawing's own tilt.",
"site": "https://upfork.dev",
"snippet": "```ts\n// before: upright boxes\nconst need = (a.w + b.w) / 2 + GAP;\nconst overlapY = a.y < b.y + b.h + GAP && a.y + a.h > b.y - GAP;\n// after: each box as drawn, tilted about its top centre by tilt() (the drawing's own function)\nconst tiltX = (t: TagBox) => t.h * Math.abs(Math.sin(tilt(t) * DEG));\nconst tiltY = (t: TagBox) => (t.w / 2) * Math.abs(Math.sin(tilt(t) * DEG));\nconst need = (a.w + b.w) / 2 + tiltX(a) + tiltX(b) + GAP;\nconst overlapY = a.y - tiltY(a) < b.y + b.h + tiltY(b) + GAP && a.y + a.h + tiltY(a) > b.y - tiltY(b) - GAP;\n```",
"title": "Tilted labels kept apart as upright boxes touch at the corners: grow each by h·|sin β| across and (w/2)·|sin β| up",
"type": "lesson-version",
"url": "https://upfork.dev/lessons/L-GJQ1",
"version": 1,
"why": ""
}