62:I[707087,["/_next/static/immutable/chunks/3arlv5bvukoo2.js","/_next/static/immutable/chunks/39v64hmfyo-sr.js","/_next/static/immutable/chunks/2nvof3-29tvc3.js","/_next/static/immutable/chunks/3tjobt77z_9dj.js","/_next/static/immutable/chunks/04j_o97cgxn2x.js","/_next/static/immutable/chunks/3upr08c9vtj8w.js","/_next/static/immutable/chunks/1ww0328si-u8x.js","/_next/static/immutable/chunks/11mfl5ymqld9-.js","/_next/static/immutable/chunks/2xxcqy6ppds3l.js","/_next/static/immutable/chunks/1bpgyrs5qflhu.js","/_next/static/immutable/chunks/0-6vu2ul1h6ld.js","/_next/static/immutable/chunks/43_s7jweyypoh.js","/_next/static/immutable/chunks/0p6vao205o1jc.js","/_next/static/immutable/chunks/1_kyvgkyokw92.js","/_next/static/immutable/chunks/1lo-zn37dolb5.js","/_next/static/immutable/chunks/1v8k6yxw1rg0u.js"],"RegistryDependencies"] 63:I[314491,["/_next/static/immutable/chunks/3arlv5bvukoo2.js","/_next/static/immutable/chunks/39v64hmfyo-sr.js","/_next/static/immutable/chunks/2nvof3-29tvc3.js","/_next/static/immutable/chunks/3tjobt77z_9dj.js","/_next/static/immutable/chunks/04j_o97cgxn2x.js","/_next/static/immutable/chunks/3upr08c9vtj8w.js","/_next/static/immutable/chunks/1ww0328si-u8x.js","/_next/static/immutable/chunks/11mfl5ymqld9-.js","/_next/static/immutable/chunks/2xxcqy6ppds3l.js","/_next/static/immutable/chunks/1bpgyrs5qflhu.js","/_next/static/immutable/chunks/0-6vu2ul1h6ld.js","/_next/static/immutable/chunks/43_s7jweyypoh.js","/_next/static/immutable/chunks/0p6vao205o1jc.js","/_next/static/immutable/chunks/1_kyvgkyokw92.js","/_next/static/immutable/chunks/1lo-zn37dolb5.js","/_next/static/immutable/chunks/1v8k6yxw1rg0u.js"],"FilesView"] 64:T8d48,// Status Cycle · snapcn — https://snapcn.dev/docs/scenes/status-cycle "use client"; import { loadFont as loadInter } from "@remotion/google-fonts/Inter"; import { useEffect, useMemo, useRef, useState } from "react"; import { AbsoluteFill, continueRender, delayRender, Easing, getRemotionEnvironment, interpolate, spring, useCurrentFrame, useVideoConfig, } from "remotion"; import { Item, mixOklch, resolveFont, type SnapCnTheme, useSnapCnTheme, } from "@/lib/snap-cn-ui"; const { fontFamily: SANS } = loadInter("normal", { weights: ["400"], subsets: ["latin"], }); const CLAMP = { extrapolateLeft: "clamp", extrapolateRight: "clamp", } as const; // --------------------------------------------------------------------------- // Proportions // // Every constant below is a *fraction* of the composition, never a pixel, so // the scene holds its shape at 720p, 1080p or a vertical crop. They were // measured off a reference recording at 802x450 by sub-pixel edge integration // and divided through; the comment on each names what was measured. // --------------------------------------------------------------------------- /** * Pill height as a multiple of the act-1 type size. Measured 44.21px against an * implied 39.2px em, both at 450. * * Keyed to the type rather than to the frame so that when a long status forces * the line to shrink, the pill shrinks with it instead of turning into a slab * with a small word floating in it. */ const PILL_H = 1.128; /** Pill centre, as a fraction of frame height. The lockup rides 1.6% low. */ const PILL_CY = 0.5164; /** * Corner radius as a fraction of the pill's own height. * * Not a stadium. Fitting a circle to the sub-pixel left edge over the pill's * top 12 rows gives R/h = 0.222–0.235 at rms 0.07–0.17px; R = h/2 fits the same * rows at rms 6.9–7.7px, two orders of magnitude worse. A stadium here reads as * a completely different object — it is the single easiest detail to get wrong. */ const PILL_R = 0.229; /** Pill padding either side of the label, as a fraction of pill height. */ const PILL_PAD = 0.19; /** Prefix-to-pill gap, as a fraction of pill height. Measured 6.5px of 44.2. */ const PILL_GAP = 0.147; /** Act-1 type size, as a fraction of frame height. Cap 29px / 0.72em of 450. */ const ACT1_EM = 0.087; /** Act-2 type size, as a fraction of frame height. Cap 72px / 0.72em of 450. */ const ACT2_EM = 0.222; /** Chip padding, as a fraction of its own type size. */ const CHIP_PAD_X = 0.42; const CHIP_PAD_Y = 0.165; /** Chip corner radius and hairline, as fractions of chip height. */ const CHIP_R = 0.162; const CHIP_BORDER = 0.017; /** Chip margin from the frame edge, as a fraction of frame width. */ const CHIP_INSET = 0.04; /** Share of the frame width the act-1 lockup may occupy before it is scaled. */ const ACT1_FIT = 0.92; /** Gap between stacked chips, as a fraction of frame height. */ const CHIP_GAP = 0.057; /** * The width morph is a **cubic-bezier, not a spring** — the `y2 > 1` control * value is the overshoot. * * This is not a stylistic preference. Fitting Remotion's `spring()` over a full * (damping, stiffness, rest) grid lands at rms 19.6px on a 207px travel, and the * failure is structural: a spring released from rest is at pi^2/242 = 4.1% of * travel one frame into an eleven-frame rise, and the reference is at 0.65%. No * triple is six times flatter at the start and still peaks that early. Fitted * per morph the reference gives (0.6,0,0.3,1.8) and (0.7,0.4,0.3,1.3); this is * their average, at rms 1.1–1.7% of travel. */ const WIDTH_EASE = Easing.bezier(0.65, 0.2, 0.3, 1.5); /** Seconds the width morph runs. Measured 15 and 14 frames on a 24fps clock. */ const WIDTH_SECONDS = 0.6; /** * The label roll: a symmetric ease-in-out — deliberately gentler and longer than * the reference. * * The reference rolls in 8 frames of 24fps on (0.75, 0, 0.25, 1) (measured * progress 0.010, 0.053, 0.164, 0.499, 0.833, 0.946, 0.990, 1.000). Rendered at * 30fps that is 10 frames whose middle two each move a third of the travel — * 32px a frame at 1080p — so the frame between them shows two half-cut labels and * the swap reads as a flicker, not a roll. Reported as "flipping too fast". * * (0.45, 0, 0.55, 1) over 0.5s is 15 frames at 30: no step above 13px at 1080p, * none below 0.8px (so no frozen frames in the tails, motion-quality rule 0). * 0.6s was tried first and read as too slow; 0.5s is the step between the two. * The label lands three frames before the width morph finishes its overshoot. */ const ROLL_EASE = Easing.bezier(0.45, 0, 0.55, 1); /** Seconds the roll runs. See ROLL_EASE for why it is not the reference's 1/3. */ const ROLL_SECONDS = 0.5; /** Roll travel, as a multiple of pill height. Measured 47.1px on a 46.2 pill. */ const ROLL_TRAVEL = 1.02; /** Seconds the green-to-cream crossfade takes. Measured 18 frames of 60fps. */ const FADE_SECONDS = 0.3; /** Seconds the lockup takes to leave upward. Measured 0.19s, exponential. */ const EXIT_SECONDS = 0.2; /** Time constant of the act-2 scroll step, in seconds. Fitted 1-exp(-t/tau). */ const SCROLL_TAU = 0.06; /** * The per-letter intro scale. * * Measured peak is 1.45x the settled size, and a spring's overshoot is * `exp(-pi*zeta/sqrt(1-zeta^2))` — so zeta = 0.25, which at stiffness 100 and * mass 1 is damping 5. That is where these numbers come from; they are not a * taste setting, and changing the damping moves the peak off the reference. */ const LETTER_SPRING = { damping: 5, stiffness: 100, mass: 1 } as const; /** * Pure scheduling and fitting math. Everything above the component is * frame-deterministic and side-effect free so it can be unit tested. */ /** Accepts an array or the comma-separated string the customizer passes. */ export function toList(value?: string[] | string): string[] { const list = typeof value === "string" ? value.split(",") : (value ?? []); return list.map((s) => s.trim()).filter(Boolean); } /** * Exponential ease-out, in frames. * * The reference's scroll step is not any fixed-duration curve: easeOutCubic * predicts 0.977 at t=0.167s against a measured 0.918, and quint/expo are far * too fast at the head. `1 - exp(-t/tau)` fits every sample of every step at * tau = 0.060s, which is what a lerp-toward-target does, and it never overshoots * — the reference's peak progress is exactly 1.000 at every step. */ export function settle(frames: number, tau: number): number { if (frames <= 0) return 0; return 1 - Math.exp(-frames / tau); } /** * Which status is up at `frame`, and how many frames since it arrived. * * The index only ever advances, and `since` is relative to the swap that put * the current label up — so a swap still settling when the next one starts * hands over cleanly instead of compounding. */ export function statusAt({ frame, introFrames, statusHold, count, }: { frame: number; introFrames: number; statusHold: number; count: number; }): { index: number; since: number } { if (count <= 0) return { index: 0, since: 0 }; let index = 0; for (let i = 1; i < count; i += 1) { if (frame >= introFrames + (i - 1) * statusHold) index = i; } return { index, since: frame - (introFrames + (index - 1) * statusHold) }; } /** * How many chips have arrived at `frame`, and how far the step they triggered * has run. Clamped to `count`, so the field stops stepping once the last chip * is in rather than scrolling the whole column off the top. */ export function chipAt({ frame, beat, stagger, count, }: { frame: number; beat: number; stagger: number; count: number; }): { arrived: number; since: number } { if (count <= 0 || frame < beat) return { arrived: 0, since: 0 }; const arrived = Math.min(count, Math.floor((frame - beat) / stagger) + 1); return { arrived, since: frame - beat - (arrived - 1) * stagger }; } /** * How much a measured line has to shrink to sit inside its budget. * * Only ever <= 1. Scaling *up* to fill the budget would make a two-word status * larger than a five-word one, which is the opposite of a design system. */ export function fitScale(measured: number, budget: number): number { if (!(measured > 0) || !(budget > 0)) return 1; return Math.min(1, budget / measured); } export interface StatusCycleMotion { /** Easing of the pill's width. `y2 > 1` on a bezier is what gives overshoot. */ widthEase: (t: number) => number; /** Seconds the width morph runs. */ widthSeconds: number; /** Easing of the label roll. */ rollEase: (t: number) => number; /** Seconds the roll runs. */ rollSeconds: number; /** Roll travel, as a multiple of pill height. */ rollTravel: number; /** Seconds the field crossfade takes. */ fadeSeconds: number; /** Seconds the lockup takes to leave upward. */ exitSeconds: number; /** Time constant of an act-2 scroll step, in seconds. */ scrollTau: number; /** Spring the intro's per-letter scale runs on. Damping sets the peak. */ letterSpring: { damping: number; stiffness: number; mass: number }; /** Frames between one letter's entry and the next. */ letterStagger: number; } /** * Measured defaults. Every one but the roll is fitted from frame data — see the * constant it reads from — so overriding one is a deliberate departure, not a * tweak. The roll departs from its reference on purpose; ROLL_EASE says why. */ export const STATUS_CYCLE_MOTION: StatusCycleMotion = { widthEase: WIDTH_EASE, widthSeconds: WIDTH_SECONDS, rollEase: ROLL_EASE, rollSeconds: ROLL_SECONDS, rollTravel: ROLL_TRAVEL, fadeSeconds: FADE_SECONDS, exitSeconds: EXIT_SECONDS, scrollTau: SCROLL_TAU, letterSpring: LETTER_SPRING, letterStagger: 1, }; export interface StatusCycleProps { /** The line that does not change, to the left of the pill. */ prefix?: string; /** Pill labels, in order. Also accepts a comma-separated string. */ statuses?: string[] | string; /** Act-2 chip labels, in order. Also accepts a comma-separated string. */ chips?: string[] | string; /** Act-1 field. Defaults to the design system's `primary`. */ fieldColor?: string; /** Act-2 field. Defaults to the design system's `background`. */ pageColor?: string; /** Pill fill. Defaults to `foreground`. */ pillColor?: string; /** Pill label. Defaults to a pale tint of the field. */ pillLabelColor?: string; /** Prefix ink. Defaults to `foreground`. */ prefixColor?: string; /** * Chip fills, cycled in order. The reference runs a period-3 cycle — a card, * a pale tint, a saturated one — and that is what the default builds from the * theme. Also accepts a comma-separated string. */ chipFills?: string[] | string; /** Chip ink. One colour on every chip, including the saturated one. */ chipTextColor?: string; /** Chip hairline. Defaults to the design system's border, scaled for a * surface this size (`mixOklch(border, foreground, 0.28)`). */ chipBorderColor?: string; /** Act-1 type weight. */ fontWeight?: number; /** Act-2 type weight. Measured 400 in the reference — the chips are bigger, * not heavier, and bumping this is the usual way to make them look cheap. */ chipFontWeight?: number; /** * Pill corner radius in px. Defaults to 0.229 x pill height — which is very * nearly shadcn's own `radius` token over a 40px control (10/40 = 0.25), so * the default already sits in the design system rather than beside it. Pass * `theme.radius` scaled to your own control size to match exactly. */ pillRadius?: number; /** Chip corner radius in px. Defaults to 0.162 x chip height. */ chipRadius?: number; /** Chip hairline width in px. Defaults to 0.017 x chip height. */ chipBorderWidth?: number; /** Pill centre, as a fraction of frame height. The reference rides 1.6% low. */ pillCenterY?: number; /** Curve and timing overrides. Merged over {@link STATUS_CYCLE_MOTION}. */ motion?: Partial; /** Act-1 type size in px. Defaults to 8.7% of the composition height. */ fontSize?: number; /** Act-2 type size in px. Defaults to 22.2% of the composition height. */ chipFontSize?: number; /** Font stack. Defaults to Inter, loaded through `@remotion/google-fonts`. */ fontFamily?: string; /** * Frames from one status swap to the next. Keep it above the roll (0.5s, 15 * frames at 30fps) plus time to read the label: at or below the roll, the pill * never rests and every label is read mid-flight. */ statusHold?: number; /** Frames the intro cascade is given before the first swap. */ introFrames?: number; /** Frames from one chip's arrival to the next. */ chipStagger?: number; /** Frame the scene starts on. */ startAt?: number; /** Playback rate. */ speed?: number; /** Design-system token overrides. */ theme?: Partial; mode?: "light" | "dark"; } interface Metrics { /** Left offset and width of every prefix glyph, in layout px. */ letters: { left: number; width: number }[]; prefixWidth: number; /** Distance from the prefix box's top to its baseline. */ baseline: number; statusWidths: number[]; chipWidths: number[]; } export function StatusCycle({ prefix = "snapcn is", statuses = ["animating", "transitioning", "rendering a scene", "installed"], chips = [ "text-reveal", "phone-frame", "answer-stream", "word-flip", "orbit-gallery", ], fieldColor, pageColor, pillColor, pillLabelColor, prefixColor, chipFills, chipTextColor, chipBorderColor, fontWeight = 400, chipFontWeight = 400, pillRadius, chipRadius, chipBorderWidth, pillCenterY = PILL_CY, motion, fontSize, chipFontSize, fontFamily, statusHold = 30, introFrames = 24, chipStagger = 8, startAt = 0, speed = 1, theme, mode, }: StatusCycleProps) { const frame = useCurrentFrame() * speed - startAt; const { fps, width, height } = useVideoConfig(); const t = useSnapCnTheme(theme, mode); const face = resolveFont(fontFamily ?? t.fontFamily) ?? SANS; // Memoised because they are `useEffect` dependencies: rebuilt every render, // the measuring effect would re-run forever. const labels = useMemo(() => toList(statuses), [statuses]); const chipLabels = useMemo(() => toList(chips), [chips]); const glyphs = useMemo(() => [...prefix], [prefix]); const field = fieldColor ?? t.primary; const page = pageColor ?? t.background; const pillFill = pillColor ?? t.foreground; const prefixInk = prefixColor ?? t.foreground; // A pale tint of the field: the reference's label is its own brand colour // lightened, and this reproduces that relationship in whatever palette the // component lands in. // // Mixed toward `card`, NOT `background`, and that is load-bearing. `mixOklch` // interpolates hue the short way round, and `background` (#faf9f6) is a *warm* // off-white with a real hue near 90 degrees — so a mix from a 264-degree blue // sweeps 174 degrees through green and lands on rgb(164,213,180). `card` is // achromatic, its hue is undefined, and the blue's hue is carried through // unchanged: rgb(178,205,247), the pale blue anyone would expect. const labelInk = pillLabelColor ?? mixOklch(field, t.card, 0.62); const chipInk = chipTextColor ?? t.foreground; // One hairline on every chip, from the system's own recipe for scaling a // border token up to a surface this size (design-system rule 3b) — not a // per-fill blend, because the reference likewise inks every chip the same. const chipEdge = chipBorderColor ?? mixOklch(t.border, t.foreground, 0.28); const m = { ...STATUS_CYCLE_MOTION, ...motion }; const fills = toList(chipFills); const fillCycle = fills.length > 0 ? fills : [t.card, mixOklch(t.card, field, 0.14), field]; const nominalEm = fontSize ?? ACT1_EM * height; const nominalChipEm = chipFontSize ?? ACT2_EM * height; // ------------------------------------------------------------------------- // Measure. `offsetWidth`/`offsetLeft` are layout px, untouched by the // transforms this scene is about to apply, which is exactly what makes them // the right tool. Measured in a hidden, untransformed copy so frame 0 can // never be captured against the wrong geometry. // ------------------------------------------------------------------------- const [metrics, setMetrics] = useState(null); const [handle] = useState(() => delayRender("status-cycle: measuring")); const letterRefs = useRef<(HTMLSpanElement | null)[]>([]); const prefixRef = useRef(null); const baselineRef = useRef(null); const statusRefs = useRef<(HTMLSpanElement | null)[]>([]); const chipRefs = useRef<(HTMLSpanElement | null)[]>([]); useEffect(() => { if (metrics) { continueRender(handle); return; } const prefixWidth = prefixRef.current?.offsetWidth ?? 0; if (prefixWidth <= 0) return; setMetrics({ letters: glyphs.map((_, i) => ({ left: letterRefs.current[i]?.offsetLeft ?? 0, width: letterRefs.current[i]?.offsetWidth ?? 0, })), prefixWidth, baseline: baselineRef.current?.offsetTop ?? 0, statusWidths: labels.map( (_, i) => statusRefs.current[i]?.offsetWidth ?? 0, ), chipWidths: chipLabels.map( (_, i) => chipRefs.current[i]?.offsetWidth ?? 0, ), }); }, [metrics, handle, glyphs, labels, chipLabels]); // ------------------------------------------------------------------------- // Timeline // ------------------------------------------------------------------------- const swapAt = (i: number) => introFrames + (i - 1) * statusHold; const act1End = swapAt(labels.length) + statusHold; const fadeStart = act1End; const fadeFrames = m.fadeSeconds * fps; // The three events are one beat, not three. In the reference the lockup leaves // and the first chip arrives on the same frame, and that frame is the exact // midpoint of the crossfade — colour starts moving, the swap happens under it, // colour finishes. Splitting them reads as three separate cuts. const beat = fadeStart + fadeFrames / 2; // Two opaque layers with an opacity ramp, not `mixOklch` between the two. // The reference's own crossfade does look like an OKLCH mix — its R channel // runs 2-5 points behind G and B, which an sRGB lerp cannot do — but its two // colours are a green and a cream, 30 degrees of hue apart. Ours are whatever // the theme says, and `primary` to `background` is 174 degrees, which OKLCH // walks the short way *through green*. A layered crossfade is what the word // means and it cannot swing. const fadeP = interpolate( frame, [fadeStart, fadeStart + fadeFrames], [0, 1], CLAMP, ); // ------------------------------------------------------------------------- // Fit // // A size measured off one sentence is a size that clips the next one. Both // acts are measured at their nominal type size and then scaled down — never // up — by however much the widest line overruns its share of the frame. Text // width is linear in font size, so the measured widths scale with the same // factor and no second measuring pass is needed. // ------------------------------------------------------------------------- const rawPad = PILL_PAD * PILL_H * nominalEm; const rawGap = PILL_GAP * PILL_H * nominalEm; const rawLockup = (metrics?.prefixWidth ?? 0) + rawGap + Math.max(0, ...(metrics?.statusWidths ?? [0])) + 2 * rawPad; const act1Fit = metrics ? fitScale(rawLockup, ACT1_FIT * width) : 1; const rawChip = Math.max(0, ...(metrics?.chipWidths ?? [0])) + 2 * CHIP_PAD_X * nominalChipEm; const chipFit = metrics ? fitScale(rawChip, (1 - 2 * CHIP_INSET) * width) : 1; const em = nominalEm * act1Fit; const chipEm = nominalChipEm * chipFit; const pillH = PILL_H * em; const pillPad = PILL_PAD * pillH; const gap = PILL_GAP * pillH; const prefixWidth = (metrics?.prefixWidth ?? 0) * act1Fit; const pillWidths = (metrics?.statusWidths ?? labels.map(() => 0)).map( (w) => w * act1Fit + 2 * pillPad, ); /** Which label is up, and how far the swap into it has progressed. */ const widthSeconds = m.widthSeconds * fps; const rollSeconds = m.rollSeconds * fps; const { index, since } = statusAt({ frame, introFrames, statusHold, count: labels.length, }); // Index 0 opens from nothing rather than cutting in at full width. The tape // cannot settle this — its first recorded frame already has a pill, and the // reference's own calling->typing morph is arithmetically inseparable from // the intro's tail — so this runs the same curve the other morphs run, over // the intro, which is the least invented thing available. const widthP = index === 0 ? m.widthEase(Math.min(1, Math.max(0, frame / introFrames))) : m.widthEase(Math.min(1, Math.max(0, since / widthSeconds))); const rollP = index === 0 ? 1 : m.rollEase(Math.min(1, Math.max(0, since / rollSeconds))); const pillW = interpolate( widthP, [0, 1], [index === 0 ? 0 : (pillWidths[index - 1] ?? 0), pillWidths[index] ?? 0], ); // The whole lockup arrives on one slow scale settle. The reference's is still // drifting -7% two seconds in; this one lands, because a settle nobody can see // is frames spent on travel that only costs sharpness. const groupScale = spring({ frame, fps, config: { damping: 26, stiffness: 90, mass: 1.4 }, from: 1.16, to: 1, }); const exitP = settle((frame - beat) * (1 / m.exitSeconds / fps), 0.28); const exitY = frame < beat ? 0 : -exitP * 0.62 * height; const total = prefixWidth + gap + pillW; const originX = (width - total) / 2; const cy = pillCenterY * height; // Only the Player gets `will-change`: a render is spread across parallel tabs // and each inherits a stale raster, so the same style comes out as several // different rasterisations and the type shimmers while standing still. const promote = getRemotionEnvironment().isRendering ? null : ({ willChange: "transform" } as const); const typeStyle = { fontFamily: face, fontWeight, // Hinting re-snaps every stem as the size slides, so the letterforms boil. // Off, shape drift over a scale falls from 3.41% to 0.22%. textRendering: "geometricPrecision" as const, whiteSpace: "nowrap" as const, }; return ( {metrics ? null : ( )} {metrics && frame < beat + m.exitSeconds * fps ? (

) : null} {metrics ? ( w * chipFit)} frame={frame} fps={fps} beat={beat} stagger={chipStagger} em={chipEm} width={width} height={height} fills={fillCycle} ink={chipInk} edge={chipEdge} radius={chipRadius} borderWidth={chipBorderWidth} weight={chipFontWeight} tau={m.scrollTau} typeStyle={typeStyle} /> ) : null} ); } /** * The intro cascade: every glyph sits at its **final advance** and scales about * its own baseline, staggered left to right. * * Measured, not guessed. Tracking one 'o' by its counter gives 1.01x → 1.45x → * 1.00x while its stroke-to-height ratio holds at 0.149 ± 0.006 — so nothing is * animating a weight or width axis, it is a plain scale, and the letters only * *look* heavier early because at 1.45x they overlap their neighbours' fixed * slots. The prefix's total ink span is unchanged from the first frame to the * last, which is only possible if the layout is static and the transform is * per-glyph. * * The one deliberate departure from the reference is the pivot. The reference * scales each letter about its centre, which drags the baseline; a moving * baseline climbs the pixel grid in whole-pixel jumps, because the rasteriser * has no vertical sub-pixel positioning at all. Pivoting on the baseline takes * judder from 0.284px to 0.014px and direction reversals from 29 to 0, and it * costs a downward growth nobody can name. */ function Prefix({ glyphs, metrics, frame, fps, em, fit, spring: springConfig, stagger, x, cy, color, typeStyle, }: { glyphs: string[]; metrics: Metrics; frame: number; fps: number; em: number; /** Scale the measured glyph offsets were taken at, relative to `em`. */ fit: number; spring: { damping: number; stiffness: number; mass: number }; stagger: number; x: number; cy: number; color: string; typeStyle: React.CSSProperties; }) { return (

{glyphs.map((g, i) => { // Stagger of one frame. Measured: the shared scale curve takes about one // 30fps frame to travel 0.71x → 1.01x, which is the gap the reference // shows between adjacent letters. const p = spring({ frame: frame - i * stagger, fps, config: springConfig, }); // The spring carries the overshoot; `interpolate` extrapolates past 1, // so mapping [0,1] onto [0.1,1] puts the peak at 1.4x on its own — no // second curve, and nothing to keep in step with the damping. const s = interpolate(p, [0, 1], [0.1, 1]); return ( {g === " " ? " " : g} ); })}

); } /** * The pill: a width that animates straight through a label that never changes * size, and two stacked labels rolling upward behind a hard clip. * * The label is laid out at its full final width and centred, and the widening * pill reveals it from the middle out — proven on the reference by the two * inter-word gaps of "sharing a moment" sitting at x = 486.0 and 521.5 across * three frames while the pill grew 83px. So the width cannot be derived from a * padded text box each frame; it is its own animated quantity. * * There is no crossfade. The label ink's mean brightness holds inside a 4% band * through every swap, including the frames where both labels are half-clipped — * a fade would collapse it toward the fill. Pure translation plus clipping. */ function Pill({ labels, index, rollP, x, cy, width, height, em, fill, ink, radius, travel, typeStyle, }: { labels: string[]; index: number; rollP: number; x: number; cy: number; width: number; height: number; em: number; fill: string; ink: string; radius: number; travel: number; typeStyle: React.CSSProperties; }) { const showOutgoing = rollP < 1 && index > 0; const label = (text: string, offset: number) => (

{text}

); return (

{showOutgoing ? label(labels[index - 1] ?? "", -rollP * travel) : null} {label(labels[index] ?? "", (1 - rollP) * travel)}

); } /** * Act 2: chips ride a field that steps, not scrolls. * * The field is dead still between beats — residual velocity under 1px per * captured frame — and then jumps exactly one slot with a hard ease-out on the * frame a new chip appears. The chips themselves do nothing: measured across * every frame each is visible, width and fill are final from the first frame and * never change, and two chips in the same step travelled 140.02px and 139.34px, * so it is one transform on the container rather than per-chip animation. */ function Chips({ labels, widths, frame, fps, beat, stagger, em, width, height, fills, ink, edge, radius, borderWidth, weight, tau: scrollTau, typeStyle, }: { labels: string[]; widths: number[]; frame: number; fps: number; beat: number; stagger: number; em: number; width: number; height: number; fills: string[]; ink: string; edge: string; radius?: number; borderWidth?: number; weight: number; tau: number; typeStyle: React.CSSProperties; }) { if (frame < beat) return null; const chipH = em * (1 + 2 * CHIP_PAD_Y); const step = chipH + CHIP_GAP * height; const tau = scrollTau * fps; // How many chips have arrived, and how far the current step has run. const { arrived, since } = chipAt({ frame, beat, stagger, count: labels.length, }); const p = settle(since, tau); // The newest chip comes to rest one gap clear of the bottom edge. Landing it // flush reads as clipped rather than as arrived — its border sits on the // frame edge and half of it is lost to the codec. const fieldY = height - CHIP_GAP * height - chipH - (arrived - 2 + p) * step; return (

{labels.slice(0, arrived).map((text, i) => { const w = (widths[i] ?? 0) + 2 * CHIP_PAD_X * em; const left = i % 2 === 0; const fill = fills[i % fills.length] ?? fills[0]; return ( // biome-ignore lint/suspicious/noArrayIndexKey: positional chip slot

{text}

); })}

); } /** * The hidden, untransformed copy every measurement is taken from. Rendered only * until `metrics` exists, and `delayRender` holds frame 0 until then. */ function Measuring({ glyphs, labels, chipLabels, em, chipEm, typeStyle, letterRefs, prefixRef, baselineRef, statusRefs, chipRefs, }: { glyphs: string[]; labels: string[]; chipLabels: string[]; em: number; chipEm: number; typeStyle: React.CSSProperties; // Plain `{ current }` shapes, not RefObject: React 18's RefObject is // read-only and rejects what `useRef(null)` hands back in a React 19 project. letterRefs: { current: (HTMLSpanElement | null)[] }; prefixRef: { current: HTMLSpanElement | null }; baselineRef: { current: HTMLSpanElement | null }; statusRefs: { current: (HTMLSpanElement | null)[] }; chipRefs: { current: (HTMLSpanElement | null)[] }; }) { return (

{glyphs.map((g, i) => ( { letterRefs.current[i] = el; }} style={{ display: "inline-block" }} > {g === " " ? " " : g} ))} {/* A zero-sized inline-block sits ON the baseline, so `offsetTop` reads it rather than a line-height ratio anyone has to guess. */} {labels.map((text, i) => ( { statusRefs.current[i] = el; }} style={{ display: "inline-block", fontSize: em, ...typeStyle }} > {text} ))} {chipLabels.map((text, i) => ( { chipRefs.current[i] = el; }} style={{ display: "inline-block", fontSize: chipEm, ...typeStyle }} > {text} ))}

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