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Critically damped, so a row never // overshoots into the slot of the player it just passed. const REORDER = { type: "spring", visualDuration: 0.45, bounce: 0 } as const; const ROLL = { type: "spring", visualDuration: 0.35, bounce: 0 } as const; const ICON_SWAP = { type: "spring", duration: 0.3, bounce: 0 } as const; const SCORE = { visualDuration: 0.45, bounce: 0 }; const number = new Intl.NumberFormat("en-US"); export function Leaderboard({ players, moves = {}, label = "Leaderboard", className, }: { players: Player[]; /** Places each player just gained (positive) or lost (negative). */ moves?: Record; label?: string; className?: string; }) { const ranked = [...players].sort((a, b) => b.score - a.score || a.name.localeCompare(b.name)); return ( // Rows are placed by transform, not flow, so the list keeps one fixed // height however the ranks shuffle.

))}

); } function Row({ player, rank, move }: { player: Player; rank: number; move: number }) { const reduceMotion = useReducedMotion(); const score = useSpring(player.score, SCORE); const scoreText = useTransform(score, (v) => number.format(Math.round(v))); useEffect(() => { if (reduceMotion) score.jump(player.score); else score.set(player.score); }, [player.score, reduceMotion, score]); return ( 0 ? "z-[2]" : move < 0 ? "z-[1]" : "z-0", )} style={{ height: ROW_H }} > {ordinal(rank)}, {player.name} , {number.format(player.score)} points {scoreText} ); } function Rank({ rank, reduceMotion }: { rank: number; reduceMotion: boolean }) { // Remembers which way the rank last changed, so the old number rolls // out the way the row is heading and the new one follows it in. const [seen, setSeen] = useState({ rank, direction: 0 }); if (seen.rank !== rank) setSeen({ rank, direction: rank < seen.rank ? 1 : -1 }); const direction = seen.direction; const podium = rank <= 3; return ( ({ y: reduceMotion ? 0 : `${d * 100}%`, opacity: 0 }), idle: { y: "0%", opacity: 1 }, exit: (d: number) => ({ y: reduceMotion ? 0 : `${-d * 100}%`, opacity: 0 }), }} initial="enter" animate="idle" exit="exit" transition={ROLL} className="col-start-1 row-start-1" > {rank} ); } function Avatar({ player }: { player: Player }) { return ( {player.avatar ? (

) : ( initials(player.name) )} ); } function Movement({ move, reduceMotion }: { move: number; reduceMotion: boolean }) { // Keeps the last change on screen while it fades out, so the arrow never // empties mid-exit. const [last, setLast] = useState(move); if (move !== 0 && move !== last) setLast(move); const visible = move !== 0; const up = last > 0; const hidden = reduceMotion ? { opacity: 0 } : { scale: 0.25, opacity: 0, filter: "blur(4px)" }; return ( {Math.abs(last)} ); } function initials(name: string) { return name .split(" ") .map((part) => part[0]) .join("") .slice(0, 2); } function ordinal(n: number) { const suffix = { one: "st", two: "nd", few: "rd", other: "th" } as const; const rule = new Intl.PluralRules("en-US", { type: "ordinal" }).select(n); return `${n}${suffix[rule as keyof typeof suffix] ?? "th"}`; } function mulberry32(seed: number) { return () => { seed = (seed + 0x6d2b79f5) | 0; let t = Math.imul(seed ^ (seed >>> 15), 1 | seed); t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t; return ((t ^ (t >>> 14)) >>> 0) / 4294967296; }; } // Faces are "Notionists" by Zoish, CC0 1.0, stored in public/avatars. const PLAYERS: Player[] = [ { id: "ava", name: "Amara Okafor", score: 2480, avatar: "/avatars/ava.svg" }, { id: "ben", name: "Jonas Weber", score: 2310, avatar: "/avatars/ben.svg" }, { id: "cara", name: "Mei Tanaka", score: 2265, avatar: "/avatars/cara.svg" }, { id: "dev", name: "Rafael Costa", score: 2140, avatar: "/avatars/dev.svg" }, { id: "fay", name: "Sara Lindqvist", score: 2055, avatar: "/avatars/fay.svg" }, { id: "gus", name: "Gus Holm", score: 1990 }, { id: "ivy", name: "Ivy Nakamura", score: 1920 }, { id: "jon", name: "Jon Reyes", score: 1875 }, ]; // Long enough to spot who moved, short enough to be gone before the next // round is likely to be played. const MOVE_CUE_MS = 1600; function rankOf(players: Player[]) { const order = [...players].sort((a, b) => b.score - a.score || a.name.localeCompare(b.name)); return Object.fromEntries(order.map((p, i) => [p.id, i])); } export default function LeaderboardDemo() { const [players, setPlayers] = useState(PLAYERS); const [moves, setMoves] = useState>({}); const [round, setRound] = useState(1); const random = useRef(mulberry32(42)); const timer = useRef>(undefined); useEffect(() => () => clearTimeout(timer.current), []); const simulate = () => { const before = rankOf(players); // Gains overlap the gaps between players, so most rounds reshuffle a // few places without turning the whole table upside down. const next = players.map((p) => ({ ...p, score: p.score + Math.round(random.current() ** 1.5 * 260), })); const after = rankOf(next); setPlayers(next); setMoves(Object.fromEntries(next.map((p) => [p.id, before[p.id] - after[p.id]]))); setRound((r) => r + 1); clearTimeout(timer.current); timer.current = setTimeout(() => setMoves({}), MOVE_CUE_MS); }; const leader = players.reduce((a, b) => (b.score > a.score ? b : a)); return (

Weekly league

Round {round}

{/* 6px of padding around 12px row radii keeps the corners concentric: 18 = 12 + 6. */}

{round > 1 ? `Round ${round}. ${leader.name} leads with ${number.format(leader.score)} points.` : ""}

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