"use client"; import { loadFont } from "@remotion/google-fonts/Unbounded"; import type React from "react"; import { useEffect, useRef, useState } from "react"; import { AbsoluteFill, continueRender, delayRender, Easing, interpolate, useCurrentFrame, useVideoConfig, } from "remotion"; const unbounded = loadFont("normal", { weights: ["400", "500"], subsets: ["latin"], }); export interface AToZProps { entries?: string[]; finale?: string; connector?: string; accent?: string; background?: string; speed?: number; theme?: "dark" | "light"; } const DEFAULT_ENTRIES = [ "any aspect ratio.", "brand fonts.", "captions.", "dark mode.", ]; const ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; const ELLIPSIS = "…"; const FONT_PX = 200; const TRACK = -0.03; const LETTER_TRACK = -0.02; const EASE_ROLL = Easing.bezier(0.6, 0, 0.1, 1); const EASE_OUT = Easing.bezier(0.22, 1, 0.36, 1); const CLAMP = { extrapolateLeft: "clamp", extrapolateRight: "clamp", } as const; const DWELLS = [28, 19, 17, 17]; const ROLL = 7; const STAGGER = 2; const FINAL_ROLL = 13; const HOLD_MIN = 36; interface Metrics { letters: Record; maxLetter: number; words: Record; space: number; connector: number; asc: number; desc: number; cap: number; tall: number; deep: number; } function measure(texts: string[], connector: string): Metrics { const canvas = document.createElement("canvas"); const ctx = canvas.getContext("2d"); if (!ctx) throw new Error("a-to-z: no 2d context"); const em = (s: string, w: number, track: number) => { ctx.font = `${w} ${FONT_PX}px "${unbounded.fontFamily}"`; return ( ctx.measureText(s).width / FONT_PX + track * Math.max(0, Array.from(s).length - 1) ); }; const letters: Record = {}; let maxLetter = 0; for (const ch of ALPHABET) { letters[ch] = em(ch, 500, 0); maxLetter = Math.max(maxLetter, letters[ch]); } const words: Record = {}; for (const tx of texts) { for (const w of tx.split(/\s+/)) { if (w && words[w] === undefined) words[w] = em(w, 500, TRACK); } } ctx.font = `500 ${FONT_PX}px "${unbounded.fontFamily}"`; const fm = ctx.measureText("Hgy"); return { letters, maxLetter, words, space: em(" ", 500, 0), connector: em(connector, 400, TRACK), asc: fm.fontBoundingBoxAscent / FONT_PX, desc: fm.fontBoundingBoxDescent / FONT_PX, cap: ctx.measureText("H").actualBoundingBoxAscent / FONT_PX, tall: ctx.measureText("dlkhfH").actualBoundingBoxAscent / FONT_PX, deep: ctx.measureText("gjpqy,").actualBoundingBoxDescent / FONT_PX, }; } function useMetrics(texts: string[], connector: string) { const key = `${connector}\u0001${texts.join("\u0002")}`; const [state, setState] = useState<{ key: string; m: Metrics } | null>(null); const [handle] = useState(() => delayRender("a-to-z: measuring")); const released = useRef(false); const input = useRef({ texts, connector }); input.current = { texts, connector }; useEffect(() => { let live = true; Promise.all([ unbounded.waitUntilDone(), document.fonts.load(`500 100px "${unbounded.fontFamily}"`), document.fonts.load(`400 100px "${unbounded.fontFamily}"`), ]) .catch(() => undefined) .then(() => { if (!live) return; setState({ key, m: measure(input.current.texts, input.current.connector), }); if (!released.current) { released.current = true; continueRender(handle); } }); return () => { live = false; }; }, [key, handle]); return state && state.key === key ? state.m : null; } function wrap(text: string, m: Metrics, max: number) { const words = text.trim().split(/\s+/); const widths = words.map((w) => m.words[w] ?? w.length * 0.7); const run = (limit: number) => { const lines: string[][] = []; let line: string[] = []; let w = 0; words.forEach((word, i) => { const add = line.length === 0 ? widths[i] : w + m.space + widths[i]; if (line.length > 0 && add > limit) { lines.push(line); line = [word]; w = widths[i]; } else { line.push(word); w = add; } }); if (line.length) lines.push(line); return lines; }; const first = run(max); let best = first; for (let k = 1; k <= 20; k++) { const next = run(max * (1 - k * 0.025)); if (next.length !== first.length) break; best = next; } return { lines: best.map((l) => l.join(" ")), widest: Math.max( ...best.map((l) => l.reduce((s, w, i) => s + (m.words[w] ?? 0) + (i > 0 ? m.space : 0), 0), ), ), }; } function initialOf(text: string) { const ch = text.trim().charAt(0).toUpperCase(); return ALPHABET.includes(ch) ? ch : "A"; } interface Step { at: number; value: T; roll: number; ease: (x: number) => number; } function stepAt(steps: Step[], t: number) { let k = 0; for (let i = 0; i < steps.length; i++) if (t >= steps[i].at) k = i; return { cur: steps[k], prev: k > 0 ? steps[k - 1] : null }; } function flickDurations(count: number) { return Array.from({ length: count }, (_, i) => { const fromStart = i; const fromEnd = count - 1 - i; if (fromStart === 0) return 3; if (fromStart === 1) return 2; if (fromEnd === 0) return 4; if (fromEnd === 1) return 3; if (fromEnd === 2) return 2; return 1; }); } export function AToZ({ entries = DEFAULT_ENTRIES, finale = "zero lock-in.", connector = "is for", accent, background, speed = 1, theme = "dark", }: AToZProps) { const t = useCurrentFrame() * speed; const { width: W, height: H, durationInFrames } = useVideoConfig(); const dark = theme === "dark"; const field = dark ? (accent ?? "#FF5A1F") : "#FFFFFF"; const stage = background === "transparent" ? "transparent" : (background ?? field); const ink = "#000000"; const letterInk = dark ? "#000000" : (accent ?? "#E8480F"); const list = entries.length > 0 ? entries : DEFAULT_ENTRIES; const m = useMetrics([...list, finale, ELLIPSIS], connector); if (!m) { return (

); } const total = durationInFrames * speed; const lastLetter = initialOf(list[list.length - 1]); const finalLetter = initialOf(finale); const between = ALPHABET.indexOf(finalLetter) > ALPHABET.indexOf(lastLetter) + 1 ? ALPHABET.slice( ALPHABET.indexOf(lastLetter) + 1, ALPHABET.indexOf(finalLetter), ).split("") : []; const flick = flickDurations(between.length); const flickSum = flick.reduce((s, d) => s + d, 0); const natural = list.map((_, k) => DWELLS[Math.min(k, DWELLS.length - 1)]); const natSum = natural.reduce((s, d) => s + d, 0); const budget = total - HOLD_MIN - FINAL_ROLL - flickSum - 4; const fit = natSum > 0 ? Math.min(1, budget / natSum) : 1; const starts: number[] = []; let at = 0; for (let k = 0; k < list.length; k++) { starts.push(at); at += Math.max(8, Math.round(natural[k] * fit)); } const ellipsisAt = at; const flickAt = between.length > 0 ? ellipsisAt + 2 : ellipsisAt; const finaleAt = flickAt + flickSum; const letterSteps: Step[] = list.map((e, k) => ({ at: starts[k], value: initialOf(e), roll: ROLL, ease: EASE_ROLL, })); let fa = flickAt; between.forEach((ch, i) => { letterSteps.push({ at: fa, value: ch, roll: 0, ease: EASE_ROLL }); fa += flick[i]; }); letterSteps.push({ at: finaleAt, value: finalLetter, roll: FINAL_ROLL, ease: EASE_OUT, }); const portrait = H > W * 1.1; const marginX = W * (portrait ? 0.09 : 0.075); const shown = [...list, finale].map(initialOf); const shownMax = Math.max(...shown.map((ch) => m.letters[ch] ?? 0)); const all = [...list, finale]; const widestWord = Math.max( ...all.flatMap((s) => s.split(/\s+/).map((w) => m.words[w] ?? 0)), ); const singleWidest = Math.max(...all.map((s) => wrap(s, m, 1e9).widest)); const lead = Math.max(1.04, m.tall + m.deep + 0.1); let G: number; let F: number; let xL: number; let textX: number; let textMax: number; let yB: number; let connectorBase: number; if (portrait) { G = Math.min(H * 0.26, W * 0.62) / m.cap; xL = marginX; textX = marginX; textMax = W - marginX * 2; F = Math.min( W * 0.1, textMax / Math.max(widestWord, 0.1), (textMax * 2) / Math.max(singleWidest * 1.1, 0.1), ); yB = H * 0.44; connectorBase = yB + F * 1.1; } else { const gap0 = W * 0.04; G = (H * 0.5) / m.cap; G = Math.min(G, (marginX * 0.8) / Math.max(m.maxLetter - shownMax, 0.01)); const colW = shownMax * G; const avail = W - marginX * 2 - colW - gap0; F = Math.min( H * 0.15, avail / Math.max(widestWord, 0.1), (avail * 2) / Math.max(singleWidest * 1.1, 0.1), ); const textW = Math.max(...all.map((s) => wrap(s, m, avail / F).widest)) * F; const groupW = colW + gap0 + textW; const left = Math.max(marginX, (W - groupW) / 2); xL = left + colW; textX = xL + gap0; textMax = W - marginX - textX; yB = H / 2 + (m.cap * G) / 2; connectorBase = yB - m.cap * G + F * 0.5 * m.cap; } const capPx = m.cap * G; const capTop = yB - capPx; const lineSets = [...list, ELLIPSIS, finale].map( (s) => wrap(s, m, textMax / F).lines, ); const Fc = F * 0.5; const lineH = lead * F; const itemTop0 = connectorBase + F * (m.deep + 0.25 + m.tall); const textSteps: Step[] = list.map((_, k) => ({ at: starts[k], value: lineSets[k], roll: ROLL, ease: EASE_ROLL, })); if (between.length > 0) { textSteps.push({ at: ellipsisAt, value: lineSets[list.length], roll: ROLL, ease: EASE_ROLL, }); } textSteps.push({ at: finaleAt + 2, value: lineSets[list.length + 1], roll: FINAL_ROLL, ease: EASE_OUT, }); const rise = (delay: number) => interpolate(t, [delay - 3, delay + 11], [0, 1], { ...CLAMP, easing: EASE_OUT, }); const rollPair = ( key: string, winTop: number, winH: number, render: (value: string, y: number, k: string) => React.ReactNode, outgoing: string | null, incoming: string | null, p: number, winStyle?: React.CSSProperties, ) => { const travel = winH * 1.02; const kids: React.ReactNode[] = []; if (outgoing !== null && p < 1) kids.push(render(outgoing, -travel * p, "o")); if (incoming !== null && p > 0) kids.push(render(incoming, travel * (1 - p), "i")); return (

{kids}

); }; const nodes: React.ReactNode[] = []; { const { cur, prev } = stepAt(letterSteps, t); const p = !prev ? rise(0) : cur.roll === 0 ? 1 : interpolate(t, [cur.at, cur.at + cur.roll], [0, 1], { ...CLAMP, easing: cur.ease, }); const pad = G * 0.06; const winTop = capTop - pad; const winH = capPx + pad * 2; const lineBox = (m.asc + m.desc) * G; const textTop = yB - m.asc * G - winTop; nodes.push( rollPair( "letter", winTop, winH, (v, y, k) => (

{v}

), prev ? prev.value : null, cur.value, p, portrait ? { left: marginX, width: W - marginX } : { left: 0, width: xL }, ), ); } const textLine = (size: number, weight: number, color: string) => function TextLine(v: string, y: number, k: string) { const lineBox = (m.asc + m.desc) * size; return (

{v}

); }; { const cp = rise(3); const winTop = connectorBase - Fc * (m.tall + 0.05); nodes.push( rollPair( "connector", winTop, Fc * (m.tall + m.deep + 0.1), textLine(Fc, 400, ink), null, connector, cp, { left: textX, right: 0 }, ), ); } { const { cur, prev } = stepAt(textSteps, t); const prevLines = prev ? prev.value : []; const curLines = cur.value; const slots = Math.max(prevLines.length, curLines.length); const slotOf = (lines: string[], s: number) => { if (portrait) return lines[s] ?? null; const i = lines.length - 1 - s; return i >= 0 ? lines[i] : null; }; for (let s = 0; s < slots; s++) { const base = portrait ? itemTop0 + s * lineH : yB - s * lineH; const order = portrait ? s : slots - 1 - s; const delay = order * STAGGER; const p = !prev ? rise(5 + delay) : interpolate(t, [cur.at + delay, cur.at + delay + cur.roll], [0, 1], { ...CLAMP, easing: cur.ease, }); const winTop = base - F * (m.tall + 0.05); nodes.push( rollPair( `s${s}`, winTop, F * (m.tall + m.deep + 0.1), textLine(F, 500, ink), slotOf(prevLines, s), slotOf(curLines, s), p, { left: textX, right: 0 }, ), ); } } return ( {nodes} ); }