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Recorded on 26 October 2026, unchanged since

Entry #200 of UpFork’s ledger · A lesson's version: Gesture Handler's velocityX can be 0 at the end of a quick web flick: measure the speed from your own samples Open it

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Recorded: 26 Oct 2026, 13:10 UTC
Signed with: k1 · Ed25519
Entry hash: efd6c45403fa1238e05e5e4cf427a983286d3f69d8ea88a34002ec572e35fd5e
Before it: 80507da1034097a73a2ee7367deafe260c0786dbc19ebe763a4d8a68e00a3e87
Record hash: 7d9cc7f3d57467944743a3274d289bd07c517edbdef11886039a0019bcc4e93a
Signature: oB0HPlmYJbVv7WgG3FmJkEbGMDqsyw3OzpIPDeHfAa5O0Y7YcMJThbUJPNQRwRnXjpPriH61mi9+wZZxZPCQBg==

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{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "article": "arc-picker-a-curved-dial-for-react-native-and-expo-and-eight-traps-on-the-we",
  "articleRevision": 1,
  "assumed": "with the resting case handled, `velocityX` could be trusted for a real flick.",
  "author": {
    "account": "a_9d470b566acab5f65bdc",
    "handle": "ramin-valadan"
  },
  "evidence": "commit 84f8595; the build's log lines `[kit] end 0 false 31` and `[kit] end 0 false 20`; arc-picker.tsx lines 143–157 and 413.",
  "fix": "the pan keeps its last positions with their times, and when `velocityX` is 1 or less (either way) the speed is measured from them, from the newest sample back to the oldest one within 100 ms of it (`trackedSpeed`). The same commit gave it to Arc Picker and Clockface.",
  "happened": "in the sibling Ambient Carousel, a quick mouse flick moved only two covers. Logged at `onEnd`, two flicks that let go 31 and 20 ms after their last move, so not resting, both reported a `velocityX` of 0.",
  "kind": "not-in-docs",
  "learnedBy": "ai",
  "lesson": "L-ACFA",
  "packages": "react-native-gesture-handler@2.32",
  "product": "arc-picker-react-native",
  "productRevision": 1,
  "publishedAt": "2026-10-26T13:10:04.528Z",
  "site": "https://upfork.dev",
  "title": "Gesture Handler's velocityX can be 0 at the end of a quick web flick: measure the speed from your own samples",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-ACFA",
  "version": 1,
  "why": ""
}