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"@/components/bjork-ui/_core/random"; import { useChartCanvas, easeOut, writeLabels } from "@/components/bjork-ui/charts/_kit/canvas"; import { useChartTheme, chartFocusRing, ChartTable, LabelPool, placeTooltip, HoverTooltip, ChartAnnouncer, type TooltipHandle, type AnnouncerHandle, type TooltipContent, } from "@/components/bjork-ui/charts/_kit/chrome"; import { clamp, crisp, damp, niceDomain, niceTicks, timeTicks, withAlpha, formatCompact, formatPercent, gaussian } from "@/components/bjork-ui/charts/_kit/scale"; export interface EquityPoint { t: number; v: number; } export interface DrawdownEpisode { peak: number; // index trough: number; recovery: number | null; depth: number; // negative fraction } export interface DrawdownChartProps { data: EquityPoint[]; benchmark?: EquityPoint[]; benchmarkLabel?: string; /** How many of the deepest drawdowns get a chip. */ topN?: number; /** Selected episode rank (0 = deepest). Uncontrolled by default. */ selected?: number | null; defaultSelected?: number | null; onSelectedChange?: (rank: number | null) => void; /** Posed crosshair index. */ index?: number | null; formatValue?: (v: number) => string; formatTime?: (t: number) => string; height?: number; ariaLabel?: string; tone?: BjorkTone; attract?: boolean; className?: string; } const TOP = 34; const PAD_LEFT = 52; const PAD_RIGHT = 10; const AXIS_H = 22; const GAP = 16; const UNDER_FRAC = 0.34; const ENTER_MS = 1000; const BRACKET_TAU = 0.12; const Y_LABELS = 6; const U_LABELS = 4; const X_LABELS = 12; const DAY = 86400000; const ATTRACT_STEP_MS = 3000; const ATTRACT_IDLE_MS = 4000; const clock = () => performance.now(); // Sign before the currency: −$1.2K, never $−1.2K. const defaultFormatValue = (v: number) => `${v < 0 ? "−" : ""}$${formatCompact(Math.abs(v), 1)}`; // Multi-year series: the tooltip and table need the year. const dateYear = new Intl.DateTimeFormat("en-US", { month: "short", day: "numeric", year: "numeric", timeZone: "UTC" }); const defaultFormatTime = (t: number) => dateYear.format(t); // Running drawdown and the distinct episodes, deepest first. export function computeDrawdowns(data: EquityPoint[]): { dd: number[]; peak: number[]; episodes: DrawdownEpisode[] } { const dd: number[] = []; const peak: number[] = []; const episodes: DrawdownEpisode[] = []; let pk = -Infinity; let pkIdx = 0; let cur: DrawdownEpisode | null = null; data.forEach((p, i) => { if (p.v >= pk) { if (cur) { cur.recovery = i; episodes.push(cur); cur = null; } pk = p.v; pkIdx = i; } const d = pk > 0 ? p.v / pk - 1 : 0; dd.push(d); peak.push(pk); if (d < 0) { if (!cur) cur = { peak: pkIdx, trough: i, recovery: null, depth: d }; if (d < cur.depth) { cur.depth = d; cur.trough = i; } } }); if (cur) episodes.push(cur); episodes.sort((a, b) => a.depth - b.depth); return { dd, peak, episodes }; } interface Run { enter: number; bracket: { x0: number; x1: number; x2: number; y0: number; y1: number; ok: boolean }; ready: boolean; hover: number | null; source: "pointer" | "keyboard" | "prop" | "attract" | null; plot: { l: number; r: number; t: number; b: number; ut: number; ub: number }; yCache: string[]; uCache: string[]; xCache: string[]; lastInput: number; attractAt: number; } export function DrawdownChart({ data, benchmark, benchmarkLabel = "Benchmark", topN = 3, selected: selectedProp, defaultSelected = 0, onSelectedChange, index, formatValue = defaultFormatValue, formatTime = defaultFormatTime, height = 400, ariaLabel = "Equity and drawdown", tone: toneProp, attract = false, className, }: DrawdownChartProps) { const { pal, reduce, vars } = useChartTheme(toneProp); const announcer = useRef(null); const tipRef = useRef(null); const wrapperRef = useRef(null); const noteRef = useRef(null); const yPool = useRef<(HTMLSpanElement | null)[]>([]); const uPool = useRef<(HTMLSpanElement | null)[]>([]); const xPool = useRef<(HTMLSpanElement | null)[]>([]); const rectRef = useRef(null); const [selState, setSelState] = useState(defaultSelected); const selected = selectedProp !== undefined ? selectedProp : selState; const dd = useMemo(() => computeDrawdowns(data), [data]); const top = useMemo(() => dd.episodes.slice(0, topN), [dd, topN]); // Deepest point, once per data change rather than spread over the array every frame. const minDD = useMemo(() => dd.dd.reduce((m, d) => (d < m ? d : m), -0.01), [dd]); const cfg = useRef({ data, benchmark, dd, minDD, top, selected, reduce, pal, formatValue, formatTime, attract }); useEffect(() => { cfg.current = { data, benchmark, dd, minDD, top, selected, reduce, pal, formatValue, formatTime, attract }; }); const st = useRef({ enter: 0, bracket: { x0: 0, x1: 0, x2: 0, y0: 0, y1: 0, ok: false }, ready: false, hover: index ?? null, source: index != null ? "prop" : null, plot: { l: 0, r: 0, t: 0, b: 0, ut: 0, ub: 0 }, yCache: [], uCache: [], xCache: [], lastInput: 0, attractAt: 0, }); const selectRef = useRef<(rank: number | null, announce: boolean) => void>(() => {}); const { rootRef, hostRef, canvasRef, wake } = useChartCanvas(({ ctx, w, h, dt }) => { const s = st.current; const c = cfg.current; const p = c.pal; const D = c.data; const n = D.length; if (n < 2) return false; const inner = h - TOP - AXIS_H - GAP; const uh = Math.round(inner * UNDER_FRAC); const plot = { l: PAD_LEFT, r: w - PAD_RIGHT, t: TOP, b: TOP + inner - uh, ut: 0, ub: 0 }; plot.ut = plot.b + GAP; plot.ub = plot.ut + uh; s.plot = plot; const t0 = D[0].t; const t1 = D[n - 1].t; const xOf = (t: number) => plot.l + ((t - t0) / Math.max(1, t1 - t0)) * (plot.r - plot.l); // Equity domain, including the benchmark. let lo = Infinity; let hi = -Infinity; for (const pt of D) { lo = Math.min(lo, pt.v); hi = Math.max(hi, pt.v); } for (const pt of c.benchmark ?? []) { lo = Math.min(lo, pt.v); hi = Math.max(hi, pt.v); } const [y0, y1] = niceDomain(lo, hi, 5); const yOf = (v: number) => plot.b - ((v - y0) / Math.max(1e-12, y1 - y0)) * (plot.b - plot.t); const [u0] = niceDomain(c.minDD * 1.05, 0, 3); const uOf = (d: number) => plot.ut + (d / Math.min(-1e-9, u0)) * (plot.ub - plot.ut); s.enter = c.reduce ? 1 : Math.min(1, s.enter + (dt * 1000) / ENTER_MS); const revealX = plot.l + (plot.r - plot.l) * easeOut(s.enter); // Grid and labels. const yt = niceTicks(y0, y1, 4); const ut = niceTicks(u0, 0, 3); ctx.strokeStyle = p.hair; ctx.lineWidth = 1; ctx.beginPath(); for (const v of yt) { ctx.moveTo(plot.l, crisp(yOf(v))); ctx.lineTo(plot.r, crisp(yOf(v))); } for (const v of ut) { if (Math.abs(v) < 1e-12) continue; ctx.moveTo(plot.l, crisp(uOf(v))); ctx.lineTo(plot.r, crisp(uOf(v))); } ctx.stroke(); writeLabels(yPool.current, s.yCache, yt.map((v) => ({ text: c.formatValue(v), x: plot.l - 8, y: yOf(v), ax: -100 }))); writeLabels(uPool.current, s.uCache, ut.map((v) => ({ text: Math.abs(v) < 1e-12 ? "0%" : formatPercent(v, 0), x: plot.l - 8, y: uOf(v), ax: -100 }))); // Tighter spacing on narrow plots, so a two-year series keeps more than one year label. const xt = timeTicks(t0, t1, plot.r - plot.l, plot.r - plot.l < 480 ? 48 : 80); writeLabels( xPool.current, s.xCache, xt.filter((tk) => xOf(tk.t) > plot.l + 16 && xOf(tk.t) < plot.r - 16).map((tk) => ({ text: tk.label, x: xOf(tk.t), y: plot.ub + 13, ax: -50 })), ); // Selected episode: a band through both panes. const ep = c.selected !== null && c.selected !== undefined ? c.top[c.selected] : null; if (ep) { const xa = xOf(D[ep.peak].t); const xb = xOf(D[ep.recovery ?? n - 1].t); ctx.fillStyle = withAlpha(p.accent, 0.06); ctx.fillRect(xa, plot.t, xb - xa, plot.b - plot.t); ctx.fillRect(xa, plot.ut, xb - xa, plot.ub - plot.ut); } ctx.save(); ctx.beginPath(); ctx.rect(0, 0, revealX, h); ctx.clip(); // Running peak: a dashed ghost of where equity would be with no drawdown. ctx.setLineDash([3, 3]); ctx.strokeStyle = p.textFaint; ctx.lineWidth = 1; ctx.beginPath(); for (let i = 0; i < n; i++) { const x = xOf(D[i].t); const y = yOf(c.dd.peak[i]); if (i === 0) ctx.moveTo(x, y); else ctx.lineTo(x, y); } ctx.stroke(); ctx.setLineDash([]); if (c.benchmark?.length) { ctx.strokeStyle = p.textSoft; ctx.lineWidth = 1.25; ctx.beginPath(); c.benchmark.forEach((pt, i) => (i === 0 ? ctx.moveTo(xOf(pt.t), yOf(pt.v)) : ctx.lineTo(xOf(pt.t), yOf(pt.v)))); ctx.stroke(); } ctx.lineJoin = "round"; ctx.lineWidth = 1.75; ctx.strokeStyle = withAlpha(p.text, 0.88); ctx.beginPath(); for (let i = 0; i < n; i++) { const x = xOf(D[i].t); const y = yOf(D[i].v); if (i === 0) ctx.moveTo(x, y); else ctx.lineTo(x, y); } ctx.stroke(); // Underwater: the drawdown below zero. ctx.beginPath(); ctx.moveTo(xOf(D[0].t), uOf(0)); for (let i = 0; i < n; i++) ctx.lineTo(xOf(D[i].t), uOf(c.dd.dd[i])); ctx.lineTo(xOf(D[n - 1].t), uOf(0)); ctx.closePath(); ctx.fillStyle = withAlpha(p.error, 0.16); ctx.fill(); ctx.strokeStyle = withAlpha(p.error, 0.85); ctx.lineWidth = 1; ctx.beginPath(); for (let i = 0; i < n; i++) { const x = xOf(D[i].t); const y = uOf(c.dd.dd[i]); if (i === 0) ctx.moveTo(x, y); else ctx.lineTo(x, y); } ctx.stroke(); ctx.restore(); ctx.strokeStyle = p.textFaint; ctx.beginPath(); ctx.moveTo(plot.l, crisp(uOf(0))); ctx.lineTo(plot.r, crisp(uOf(0))); ctx.stroke(); // Bracket: peak to trough on the equity line, eased between episodes. let moving = false; const note = noteRef.current; if (ep) { const tgt = { x0: xOf(D[ep.peak].t), x1: xOf(D[ep.trough].t), x2: xOf(D[ep.recovery ?? n - 1].t), y0: yOf(D[ep.peak].v), y1: yOf(D[ep.trough].v) }; const b = s.bracket; if (!b.ok || c.reduce) Object.assign(b, tgt, { ok: true }); else { for (const k of ["x0", "x1", "x2", "y0", "y1"] as const) { b[k] = damp(b[k], tgt[k], BRACKET_TAU, dt); if (Math.abs(b[k] - tgt[k]) > 0.2) moving = true; else b[k] = tgt[k]; } } const a = clamp((s.enter - 0.7) / 0.3, 0, 1); ctx.globalAlpha = a; ctx.strokeStyle = p.accentInk; ctx.lineWidth = 1.25; ctx.beginPath(); // Horizontal from the peak to above the trough, then down to the trough. ctx.moveTo(b.x0, crisp(b.y0)); ctx.lineTo(b.x1, crisp(b.y0)); ctx.moveTo(crisp(b.x1), b.y0); ctx.lineTo(crisp(b.x1), b.y1); ctx.stroke(); for (const [x, y] of [ [b.x0, b.y0], [b.x1, b.y1], ]) { ctx.beginPath(); ctx.arc(x, y, 3.5, 0, Math.PI * 2); ctx.fillStyle = p.accent; ctx.fill(); ctx.lineWidth = 2; ctx.strokeStyle = p.stage; ctx.stroke(); } ctx.globalAlpha = 1; if (note) { const days = ep.recovery !== null ? Math.round((D[ep.recovery].t - D[ep.trough].t) / DAY) : null; const text = `${formatPercent(ep.depth, 1)} · ${days !== null ? `${days}d to recover` : "not recovered"}`; if (note.textContent !== text) { note.textContent = text; note.dataset.w = String(note.offsetWidth); } const nw = Number(note.dataset.w) || 0; const ux = clamp(b.x1 - nw / 2, plot.l, plot.r - nw); note.style.opacity = String(a); note.style.transform = `translate3d(${ux.toFixed(1)}px, ${(uOf(ep.depth) + 6).toFixed(1)}px, 0)`; } } else { s.bracket.ok = false; if (note) note.style.opacity = "0"; } // Crosshair through both panes. const tip = tipRef.current; if (s.hover !== null && s.hover >= 0 && s.hover < n) { const i = s.hover; const x = crisp(xOf(D[i].t) - 0.5); ctx.strokeStyle = p.textSoft; ctx.lineWidth = 1; ctx.beginPath(); ctx.moveTo(x, plot.t); ctx.lineTo(x, plot.b); ctx.moveTo(x, plot.ut); ctx.lineTo(x, plot.ub); ctx.stroke(); for (const [y, col] of [ [yOf(D[i].v), p.text], [uOf(c.dd.dd[i]), p.error], ] as [number, string][]) { ctx.beginPath(); ctx.arc(x, y, 3.5, 0, Math.PI * 2); ctx.fillStyle = col; ctx.fill(); ctx.lineWidth = 2; ctx.strokeStyle = p.stage; ctx.stroke(); } if (tip?.el) { const pos = placeTooltip(x, yOf(D[i].v), tip.size.w, tip.size.h, w, h, 14); tip.el.style.transform = `translate3d(${pos.x}px, ${pos.y}px, 0)`; } } if (c.attract && !c.reduce && c.top.length && (!s.lastInput || clock() - s.lastInput > ATTRACT_IDLE_MS)) { if (clock() - s.attractAt > ATTRACT_STEP_MS) { s.attractAt = clock(); selectRef.current(((c.selected ?? -1) + 1) % c.top.length, false); } return true; } return moving || s.enter < 1; }); const tooltipFor = (i: number): TooltipContent | null => { const pt = data[i]; if (!pt) return null; const d = dd.dd[i]; // Days since the running peak. let k = i; while (k > 0 && data[k - 1].v < dd.peak[i]) k--; const since = d < 0 ? Math.round((pt.t - data[Math.max(0, k - 1)].t) / DAY) : 0; const bm = benchmark?.find((b) => b.t === pt.t); return { key: `${i}|${pal.text}`, title: formatTime(pt.t), rows: [ { key: "v", label: "Equity", value: formatValue(pt.v), color: pal.text }, ...(bm ? [{ key: "b", label: benchmarkLabel, value: formatValue(bm.v), color: pal.textSoft, strong: false }] : []), { key: "d", label: "Drawdown", value: d < 0 ? formatPercent(d, 1) : "at peak", color: pal.error }, ...(d < 0 ? [{ key: "s", label: "Under water", value: `${since}d`, strong: false }] : []), ], }; }; const setHover = (i: number | null, source: Run["source"]) => { const s = st.current; if (s.hover === i && s.source === source) return; s.hover = i; s.source = i === null ? null : source; tipRef.current?.set(i === null ? null : tooltipFor(i)); if (i !== null && source === "keyboard") { const d = dd.dd[i]; announcer.current?.say(`${formatTime(data[i].t)}: ${formatValue(data[i].v)}, ${d < 0 ? `${formatPercent(-d, 1)} below peak` : "at a new peak"}`); } wake(); }; const select = (rank: number | null, announce = true) => { if (selectedProp === undefined) setSelState(rank); onSelectedChange?.(rank); const ep = rank !== null ? top[rank] : null; if (announce && ep) { const days = ep.recovery !== null ? Math.round((data[ep.recovery].t - data[ep.trough].t) / DAY) : null; announcer.current?.say(`Drawdown ${rank! + 1}: ${formatPercent(ep.depth, 1)} from ${formatTime(data[ep.peak].t)} to ${formatTime(data[ep.trough].t)}, ${days !== null ? `recovered in ${days} days` : "not yet recovered"}`); } wake(); }; useEffect(() => { selectRef.current = select; }); useEffect(() => { wake(); }, [data, benchmark, dd, top, selected, pal, reduce, attract, wake]); useEffect(() => { if (index === undefined) return; setHover(index, index === null ? null : "prop"); // eslint-disable-next-line react-hooks/exhaustive-deps }, [index, pal]); const onPointerMove = (e: PointerEvent) => { st.current.lastInput = clock(); const rect = rectRef.current ?? wrapperRef.current?.getBoundingClientRect(); if (!rect || data.length < 2) return; const s = st.current; const x = e.clientX - rect.left; const y = e.clientY - rect.top; if (x < s.plot.l || x > s.plot.r || y < s.plot.t || y > s.plot.ub) { setHover(null, null); return; } const t = data[0].t + ((x - s.plot.l) / (s.plot.r - s.plot.l)) * (data[data.length - 1].t - data[0].t); let lo = 0; let hi = data.length - 1; while (lo < hi) { const mid = (lo + hi) >>> 1; if (data[mid].t < t) lo = mid + 1; else hi = mid; } if (lo > 0 && Math.abs(data[lo - 1].t - t) < Math.abs(data[lo].t - t)) lo--; setHover(lo, "pointer"); }; const onKeyDown = (e: KeyboardEvent) => { const s = st.current; s.lastInput = clock(); const n = data.length; if (e.key === "ArrowLeft" || e.key === "ArrowRight") { e.preventDefault(); const step = (e.key === "ArrowLeft" ? -1 : 1) * (e.shiftKey ? 10 : 1); setHover(s.hover === null || s.source === "attract" ? n - 1 : clamp(s.hover + step, 0, n - 1), "keyboard"); } else if (e.key === "Home" || e.key === "End") { e.preventDefault(); setHover(e.key === "Home" ? 0 : n - 1, "keyboard"); } else if (/^[1-9]$/.test(e.key) && Number(e.key) <= top.length) { e.preventDefault(); const rank = Number(e.key) - 1; select(rank); setHover(top[rank].trough, "keyboard"); } else if (e.key === "Escape") setHover(null, null); }; const tableRows = useMemo(() => top.map((ep, r) => [`#${r + 1}`, formatPercent(ep.depth, 1), formatTime(data[ep.peak].t), formatTime(data[ep.trough].t), ep.recovery !== null ? formatTime(data[ep.recovery].t) : "Not recovered"]), [top, data, formatTime]); const tableCols = useMemo(() => ["Rank", "Depth", "Peak", "Trough", "Recovered"], []); const last = data[data.length - 1]; return (

{/* Episode chips: real buttons. */}

Worst {top.map((ep, r) => { const on = selected === r; return ( ); })}

{ if (wrapperRef.current) rectRef.current = wrapperRef.current.getBoundingClientRect(); }} onPointerMove={onPointerMove} onPointerDown={(e) => { if (wrapperRef.current) rectRef.current = wrapperRef.current.getBoundingClientRect(); if (e.pointerType === "touch") onPointerMove(e); }} onPointerLeave={(e) => { // A touch tap fires leave right after up; keep the tapped mark until the next tap. if (e.pointerType !== "touch") setHover(null, null); }} onKeyDown={onKeyDown} className={cn("absolute inset-0 cursor-crosshair touch-pan-y rounded-[10px]", chartFocusRing)} >

); } // Seeded equity curve for demos: drift, volatility regimes and a couple of real drawdowns. export function createEquityCurve(seed: number, days = 756, start = Date.UTC(2022, 0, 3)): { equity: EquityPoint[]; benchmark: EquityPoint[] } { const rnd = mulberry32(seed); let v = 100000; let b = 100000; let vol = 0.009; const equity: EquityPoint[] = []; const benchmark: EquityPoint[] = []; for (let i = 0; i < days; i++) { const shock = rnd() < 0.006 ? -0.035 : 0; vol = clamp(vol * (0.97 + rnd() * 0.06) + (shock ? 0.004 : 0), 0.005, 0.03); const m = gaussian(rnd); // One deliberate regime: a sharp slide around 40% of the way in, then a slower recovery. const f = i / days; const regime = f > 0.4 && f < 0.44 ? -0.0085 : f >= 0.44 && f < 0.6 ? 0.0034 : 0; v *= 1 + 0.0006 + regime + m * vol * (f > 0.85 ? 0.6 : 1) + shock; b *= 1 + 0.0003 + (m * 0.6 + gaussian(rnd) * 0.8) * 0.008; equity.push({ t: start + i * DAY, v }); benchmark.push({ t: start + i * DAY, v: b }); } return { equity, benchmark }; } a3:T540,export type BjorkTone = "dark" | "light"; // Canvas, WebGL and SVG attribute colours. DOM code uses the CSS tokens with these as fallbacks. export const BJORK_PALETTE = { dark: { bg: "#050505", stage: "#111111", surface: "#121212", raised: "#161616", active: "#202020", border: "#232323", borderStrong: "#343434", text: "#ededed", textMedium: "rgba(237,237,237,0.72)", textMuted: "rgba(237,237,237,0.6)", textSoft: "rgba(237,237,237,0.5)", textFaint: "rgba(237,237,237,0.22)", hair: "rgba(237,237,237,0.12)", accent: "#ec5c13", accentInk: "#ec5c13", accentFill: "#b84a12", accentSoft: "rgba(236,92,19,0.12)", accentMuted: "rgba(236,92,19,0.24)", accentFg: "#fff2ea", success: "#4cc38a", warning: "#f2b544", error: "#ff5c4d", }, light: { bg: "#f7f5ef", stage: "#f7f5ef", surface: "#fffcf6", raised: "#f5efe3", active: "#efe7d8", border: "#eee6db", borderStrong: "#e1d7c8", text: "#171717", textMedium: "rgba(23,23,23,0.78)", textMuted: "rgba(23,23,23,0.68)", textSoft: "rgba(23,23,23,0.62)", textFaint: "rgba(23,23,23,0.22)", hair: "rgba(23,23,23,0.10)", accent: "#ec7d43", accentInk: "#b4531f", accentFill: "#ec7d43", accentSoft: "rgba(236,125,67,0.10)", accentMuted: "rgba(236,125,67,0.20)", accentFg: "#3f2112", success: "#1f8a55", warning: "#a86b00", error: "#c8361f", }, } as const; a4:T8ed,// Seeded randomness and noise. Deterministic for a given seed, so previews and tests repeat. // Small fast PRNG. Returns floats in [0, 1). export function mulberry32(seed: number): () => number { let a = seed >>> 0; return () => { a = (a + 0x6d2b79f5) >>> 0; let t = a; t = Math.imul(t ^ (t >>> 15), t | 1); t ^= t + Math.imul(t ^ (t >>> 7), t | 61); return ((t ^ (t >>> 14)) >>> 0) / 4294967296; }; } // FNV-1a 32-bit. export function hashString(s: string): number { let h = 0x811c9dc5; for (let i = 0; i < s.length; i++) { h ^= s.charCodeAt(i); h = Math.imul(h, 0x01000193); } return h >>> 0; } // Integer lattice hash to [-1, 1]. function latticeHash(seed: number, x: number, y = 0): number { let h = Math.imul(x | 0, 374761393) ^ Math.imul(y | 0, 668265263) ^ Math.imul(seed | 0, 2246822519); h = Math.imul(h ^ (h >>> 13), 1274126177); h ^= h >>> 16; return ((h >>> 0) / 4294967295) * 2 - 1; } function smooth(t: number): number { return t * t * (3 - 2 * t); } export function valueNoise1D(seed: number): (x: number) => number { return (x: number) => { const i = Math.floor(x); const f = x - i; const a = latticeHash(seed, i); const b = latticeHash(seed, i + 1); return a + (b - a) * smooth(f); }; } export function fbm1D(seed: number, octaves = 3): (x: number) => number { const layers = Array.from({ length: octaves }, (_, o) => valueNoise1D(seed + o * 101)); let norm = 0; for (let o = 0; o < octaves; o++) norm += 0.5 ** o; return (x: number) => { let sum = 0; let amp = 1; let freq = 1; for (let o = 0; o < octaves; o++) { sum += amp * layers[o](x * freq); amp *= 0.5; freq *= 2; } return sum / norm; }; } export function valueNoise2D(seed: number): (x: number, y: number) => number { return (x: number, y: number) => { const xi = Math.floor(x); const yi = Math.floor(y); const fx = smooth(x - xi); const fy = smooth(y - yi); const a = latticeHash(seed, xi, yi); const b = latticeHash(seed, xi + 1, yi); const c = latticeHash(seed, xi, yi + 1); const d = latticeHash(seed, xi + 1, yi + 1); const top = a + (b - a) * fx; const bottom = c + (d - c) * fx; return top + (bottom - top) * fy; }; } a5:T130a,"use client"; // Canvas plumbing shared by the Charts collection. One hook gives a chart a measured host, a // DPR-capped canvas that follows it, and a draw loop that pauses offscreen and idles when settled. import { useCallback, useEffect, useRef, type RefObject } from "react"; import { useVisibleLoop } from "@/components/bjork-ui/_core/loop"; import { sizeCanvas, useElementSize } from "@/components/bjork-ui/_core/canvas"; import { cubicBezier, ease } from "@/components/bjork-ui/_core/motion"; export interface ChartFrame { ctx: CanvasRenderingContext2D; w: number; h: number; dt: number; t: number; } /** * `draw` runs inside `useVisibleLoop`. Return true to keep animating, false to go idle until `wake()`. * The loop root is `rootRef` (gets `data-loop`). The canvas is sized to `hostRef`. */ export function useChartCanvas(draw: (f: ChartFrame) => boolean) { const rootRef = useRef(null); const hostRef = useRef(null); const canvasRef = useRef(null); const size = useElementSize(hostRef); const sizeRef = useRef({ w: 0, h: 0, dpr: 1 }); const drawRef = useRef(draw); useEffect(() => { drawRef.current = draw; }); const frame = useCallback((dt: number, t: number) => { const canvas = canvasRef.current; const { w, h, dpr } = sizeRef.current; if (!canvas || !w || !h) return true; const ctx = canvas.getContext("2d"); if (!ctx) return false; ctx.setTransform(dpr, 0, 0, dpr, 0, 0); ctx.clearRect(0, 0, w, h); return drawRef.current({ ctx, w, h, dt, t }); }, []); const { wake } = useVisibleLoop(rootRef as RefObject, frame); useEffect(() => { const canvas = canvasRef.current; if (!canvas || !size.width || !size.height) return; sizeRef.current = { w: size.width, h: size.height, dpr: sizeCanvas(canvas, size.width, size.height) }; wake(); }, [size.width, size.height, wake]); return { rootRef, hostRef, canvasRef, size, wake }; } // The house ease-out for entrances, usable in rAF code. export const easeOut = cubicBezier(...(ease.out as unknown as [number, number, number, number])); export const easeInOut = cubicBezier(...(ease.inOut as unknown as [number, number, number, number])); // A 45 degree hatch pattern in `color`, for counterfactual and loss regions. const hatchCache = new Map(); export function hatchPattern(ctx: CanvasRenderingContext2D, color: string, gap = 5, width = 1): CanvasPattern | null { const key = `${color}|${gap}|${width}`; if (hatchCache.has(key)) return hatchCache.get(key)!; if (typeof document === "undefined") return null; const tile = document.createElement("canvas"); const s = gap * 2; tile.width = s * 2; tile.height = s * 2; const c = tile.getContext("2d"); if (!c) return null; c.scale(2, 2); c.strokeStyle = color; c.lineWidth = width; c.beginPath(); for (let k = -s; k <= s * 2; k += gap) { c.moveTo(k, s); c.lineTo(k + s, 0); } c.stroke(); const pattern = ctx.createPattern(tile, "repeat"); pattern?.setTransform(new DOMMatrix().scale(0.5, 0.5)); hatchCache.set(key, pattern); return pattern; } // Rounded rect path with independent top and bottom radii (bars: round data end, square baseline). export function roundRectPath( ctx: CanvasRenderingContext2D, x: number, y: number, w: number, h: number, rTop: number, rBottom = 0, ) { if (w <= 0 || h <= 0) return; const rt = Math.min(rTop, w / 2, h / 2); const rb = Math.min(rBottom, w / 2, h / 2); ctx.moveTo(x + rt, y); ctx.lineTo(x + w - rt, y); if (rt) ctx.arcTo(x + w, y, x + w, y + rt, rt); ctx.lineTo(x + w, y + h - rb); if (rb) ctx.arcTo(x + w, y + h, x + w - rb, y + h, rb); ctx.lineTo(x + rb, y + h); if (rb) ctx.arcTo(x, y + h, x, y + h - rb, rb); ctx.lineTo(x, y + rt); if (rt) ctx.arcTo(x, y, x + rt, y, rt); ctx.closePath(); } export interface PlacedLabel { text: string; x: number; y: number; /** translate percentages applied after the position, e.g. -50 to centre. */ ax?: number; ay?: number; opacity?: number; } // Writes a pool of absolutely positioned label spans from the loop: text only when it changes, // position by transform only. Unused spans hide. export function writeLabels(els: (HTMLElement | null)[], cache: string[], items: PlacedLabel[]) { for (let i = 0; i < els.length; i++) { const el = els[i]; if (!el) continue; const it = items[i]; if (!it) { if (el.style.opacity !== "0") el.style.opacity = "0"; continue; } if (cache[i] !== it.text) { cache[i] = it.text; el.textContent = it.text; } el.style.opacity = String(it.opacity ?? 1); el.style.transform = `translate3d(${it.x.toFixed(2)}px, ${it.y.toFixed(2)}px, 0) translate(${it.ax ?? 0}%, ${it.ay ?? -50}%)`; } } a6:Td34,"use client"; import { useCallback, useEffect, useMemo, useRef, type RefObject } from "react"; export interface VisibleLoopOptions { enabled?: boolean; fpsCap?: number; rootMargin?: string; } /** * Runs `frame(dt, t)` on requestAnimationFrame while the element is near the viewport, * the tab is visible and `enabled` is not false. Return `false` from `frame` to go idle * until `wake()` is called. Writes `data-loop` on the element: running, idle or paused. */ export function useVisibleLoop( ref: RefObject, frame: (dt: number, t: number) => boolean | void, opts?: VisibleLoopOptions, ): { wake: () => void } { const enabled = opts?.enabled !== false; const fpsCap = opts?.fpsCap ?? 0; const rootMargin = opts?.rootMargin ?? "96px"; const frameRef = useRef(frame); useEffect(() => { frameRef.current = frame; }, [frame]); const wakeRef = useRef<() => void>(() => {}); const wake = useCallback(() => wakeRef.current(), []); useEffect(() => { const el = ref.current; if (!el || typeof window === "undefined") return; let wants = true; // false once the frame callback returns false let inView = false; let raf = 0; let last = 0; let t = 0; const minFrame = fpsCap > 0 ? 1000 / fpsCap : 0; const canRun = () => enabled && inView && document.visibilityState === "visible"; const stop = () => { if (raf) cancelAnimationFrame(raf); raf = 0; }; const update = () => { if (!enabled) { stop(); el.dataset.loop = "paused"; return; } if (!wants) { stop(); el.dataset.loop = "idle"; return; } if (!canRun()) { stop(); el.dataset.loop = "paused"; return; } el.dataset.loop = "running"; if (!raf) { last = performance.now(); raf = requestAnimationFrame(tick); } }; const tick = (now: number) => { raf = 0; if (!canRun() || !wants) { update(); return; } const elapsed = now - last; if (minFrame && elapsed < minFrame - 0.5) { raf = requestAnimationFrame(tick); return; } last = now; const dt = Math.min(0.05, Math.max(0, elapsed / 1000)); t += dt; const keep = frameRef.current(dt, t); if (keep === false) { wants = false; update(); return; } raf = requestAnimationFrame(tick); }; const observer = new IntersectionObserver( ([entry]) => { inView = entry.isIntersecting; update(); }, { rootMargin }, ); observer.observe(el); const onVisibility = () => update(); document.addEventListener("visibilitychange", onVisibility); wakeRef.current = () => { wants = true; update(); }; update(); return () => { stop(); observer.disconnect(); document.removeEventListener("visibilitychange", onVisibility); wakeRef.current = () => {}; }; }, [ref, enabled, fpsCap, rootMargin]); return useMemo(() => ({ wake }), [wake]); } // matchMedia based check. False on the server. export function isCoarsePointer(): boolean { if (typeof window === "undefined" || typeof window.matchMedia !== "function") return false; return window.matchMedia("(pointer: coarse)").matches; } a7:T5ec,"use client"; import { useEffect, useState, type RefObject } from "react"; import { isCoarsePointer } from "./loop"; // Caps DPR at 1.5 on coarse pointers and 2 otherwise. export function defaultMaxDpr(): number { return isCoarsePointer() ? 1.5 : 2; } // Sets the backing size for a CSS box and returns the DPR used. export function sizeCanvas( canvas: HTMLCanvasElement, cssW: number, cssH: number, maxDpr: number = defaultMaxDpr(), ): number { const dpr = Math.min(typeof window !== "undefined" ? window.devicePixelRatio || 1 : 1, maxDpr); canvas.width = Math.max(1, Math.round(cssW * dpr)); canvas.height = Math.max(1, Math.round(cssH * dpr)); canvas.style.width = `${cssW}px`; canvas.style.height = `${cssH}px`; return dpr; } // Rounded size of an element, kept current with a ResizeObserver. export function useElementSize(ref: RefObject): { width: number; height: number } { const [size, setSize] = useState({ width: 0, height: 0 }); useEffect(() => { const el = ref.current; if (!el || typeof ResizeObserver === "undefined") return; const observer = new ResizeObserver((entries) => { const box = entries[0]?.contentRect; if (!box) return; const width = Math.round(box.width); const height = Math.round(box.height); setSize((prev) => (prev.width === width && prev.height === height ? prev : { width, height })); }); observer.observe(el); return () => observer.disconnect(); }, [ref]); return size; } a8:T835,// Shared springs, easings and durations. Components import these instead of inventing values. export const springs = { press: { type: "spring", stiffness: 500, damping: 30, mass: 0.6 }, snappy: { type: "spring", stiffness: 400, damping: 25, mass: 1 }, standard: { type: "spring", stiffness: 300, damping: 30, mass: 0.8 }, soft: { type: "spring", stiffness: 200, damping: 25, mass: 1.2 }, settle: { type: "spring", stiffness: 380, damping: 30, mass: 0.8 }, blurIn: { type: "spring", stiffness: 400, damping: 28, mass: 0.6 }, } as const; export const ease = { out: [0.23, 1, 0.32, 1], inOut: [0.77, 0, 0.175, 1], drawer: [0.32, 0.72, 0, 1], } as const; export const easeCss = { out: "cubic-bezier(0.23,1,0.32,1)", inOut: "cubic-bezier(0.77,0,0.175,1)", drawer: "cubic-bezier(0.32,0.72,0,1)", } as const; export const durations = { press: 140, tooltip: 160, menu: 200, panel: 280 } as const; // ms // Cubic bezier easing for canvas and rAF code. Returns progress y for input x in [0, 1]. export function cubicBezier(x1: number, y1: number, x2: number, y2: number): (t: number) => number { const cx = 3 * x1; const bx = 3 * (x2 - x1) - cx; const ax = 1 - cx - bx; const cy = 3 * y1; const by = 3 * (y2 - y1) - cy; const ay = 1 - cy - by; const sampleX = (s: number) => ((ax * s + bx) * s + cx) * s; const sampleY = (s: number) => ((ay * s + by) * s + cy) * s; const sampleDX = (s: number) => (3 * ax * s + 2 * bx) * s + cx; const solveX = (x: number) => { let s = x; for (let i = 0; i < 8; i++) { const err = sampleX(s) - x; if (Math.abs(err) < 1e-6) return s; const d = sampleDX(s); if (Math.abs(d) < 1e-6) break; s -= err / d; } let lo = 0; let hi = 1; s = x; while (lo < hi) { const v = sampleX(s); if (Math.abs(v - x) < 1e-6) return s; if (x > v) lo = s; else hi = s; s = (lo + hi) / 2; if (hi - lo < 1e-7) break; } return s; }; return (t: number) => { if (t <= 0) return 0; if (t >= 1) return 1; return sampleY(solveX(t)); }; } a9:T3085,"use client"; // Shared chart chrome for the Charts collection: theme vars, the hover tooltip, legend keys and the // screen-reader table twin every chart ships with. import { forwardRef, memo, useEffect, useImperativeHandle, useLayoutEffect, useRef, useState, type CSSProperties, type ReactNode } from "react"; import { useReducedMotion } from "framer-motion"; import { cn } from "@/lib/utils"; import { BJORK_PALETTE, type BjorkTone } from "@/components/bjork-ui/_core/palette"; import { useBjorkTone } from "@/components/bjork-ui/_core/tone"; import { LiveRegion } from "@/components/bjork-ui/_core/a11y"; import { surfaceVars } from "@/components/bjork-ui/_core/surface"; export type ChartPalette = (typeof BJORK_PALETTE)[BjorkTone]; // Tokens a chart root writes so DOM overlays follow `tone` even outside a themed page. export function chartVars(pal: ChartPalette): CSSProperties { return { ...surfaceVars(pal === BJORK_PALETTE.light ? "light" : "dark"), "--bjork-accent": pal.accent, "--bjork-accent-ink": pal.accentInk, "--bjork-accent-fill": pal.accentFill, "--bjork-accent-soft": pal.accentSoft, "--bjork-accent-foreground": pal.accentFg, "--bjork-text": pal.text, "--bjork-text-medium": pal.textMedium, "--bjork-text-muted": pal.textMuted, "--bjork-text-soft": pal.textSoft, "--bjork-text-faint": pal.textFaint, "--bjork-hair": pal.hair, "--bjork-border": pal.border, "--bjork-border-strong": pal.borderStrong, "--bjork-surface": pal.surface, "--bjork-surface-hover": pal.raised, "--bjork-ring-offset": pal.bg, // The surface a chart sits on, for label halos and cut-outs. Override it on the root if needed. "--bjork-chart-bg": pal.stage, "--bjork-success": pal.success, "--bjork-warning": pal.warning, "--bjork-error": pal.error, } as CSSProperties; } // Tone, palette, reduced motion and root vars in one call. export function useChartTheme(toneProp?: BjorkTone) { const tone = useBjorkTone(toneProp); const pal = BJORK_PALETTE[tone]; const reduce = !!useReducedMotion(); return { tone, pal, reduce, vars: chartVars(pal) }; } // Focus ring shared by every focusable plot surface. export const chartFocusRing = "outline-none focus-visible:ring-2 focus-visible:ring-[color:var(--bjork-accent)] focus-visible:ring-offset-2 focus-visible:ring-offset-[color:var(--bjork-ring-offset)]"; // Mono label style: 10px Geist Mono, tabular, cap-trimmed. export const chartMono = "font-mono text-[10px] leading-none tabular-nums [text-box:trim-both_cap_alphabetic]"; // Floating chart surfaces follow the library canon (_core/surface.ts): a 1px border plus the inset light // shadow. Hover cards take the full surface shadow; small readout tags take the soft one. Colours come // from chartVars, so light and dark both follow the tone. export const chartCardEdge = "border border-[color:var(--bjork-border)] shadow-[var(--bjork-shadow-surface)]"; export const chartTagEdge = "border border-[color:var(--bjork-border)] shadow-[var(--bjork-shadow-soft)]"; export interface TooltipRow { key?: string; label: ReactNode; value: ReactNode; color?: string; dashed?: boolean; strong?: boolean; } // The hover card. Values lead, labels follow, series keyed with a short line in the series colour. // Position it with `style.transform` from the caller; it never takes pointer events. export const ChartTooltip = forwardRef< HTMLDivElement, { title?: ReactNode; rows: TooltipRow[]; visible: boolean; className?: string; style?: CSSProperties; tipKey?: string } >(function ChartTooltip({ title, rows, visible, className, style, tipKey }, ref) { return ( ); }); // Places a tooltip of size (tw, th) next to (x, y) inside a (w, h) box, flipping away from edges. export function placeTooltip( x: number, y: number, tw: number, th: number, w: number, h: number, gap = 12, ): { x: number; y: number } { let tx = x + gap; if (tx + tw > w) tx = x - gap - tw; if (tx < 0) tx = Math.max(0, Math.min(w - tw, x - tw / 2)); let ty = y - th - gap; if (ty < 0) ty = Math.min(h - th, y + gap); return { x: Math.round(tx), y: Math.round(Math.max(0, ty)) }; } export interface LegendItem { id: string; label: string; color: string; shape?: "line" | "dash" | "rect" | "dot"; muted?: boolean; } // A legend row. Keys mirror the mark: line for lines, rect for areas and bars. export function ChartLegend({ items, className, onHover, activeId, }: { items: LegendItem[]; className?: string; onHover?: (id: string | null) => void; activeId?: string | null; }) { return (

{items.map((it) => { const dim = (activeId && activeId !== it.id) || it.muted; return ( onHover(it.id) : undefined} onPointerLeave={onHover ? () => onHover(null) : undefined} className={cn( "inline-flex items-center gap-1.5 font-bjork-alpha text-[11px] font-medium leading-3 transition-opacity duration-150 ease-out", dim ? "opacity-45" : "opacity-100", "text-[color:var(--bjork-text-medium)]", )} > {it.label} ); })}

); } export function LegendKey({ color, shape = "rect" }: { color: string; shape?: LegendItem["shape"] }) { if (shape === "line") return ; if (shape === "dash") return ; if (shape === "dot") return ; return ; } // The table twin. Every value the chart shows is reachable here without hovering. // Memoised: hover state re-renders the chart, never the table. Pass memoised rows. export const ChartTable = memo(function ChartTable({ caption, columns, rows, }: { caption: string; columns: string[]; rows: (string | number)[][]; }) { return ( {columns.map((c) => ( ))} {rows.map((r, i) => ( {r.map((cell, j) => j === 0 ? ( ) : ( ), )} ))}

{caption}
{c}
{cell}	{cell}

); }); // A pool of absolutely positioned spans the draw loop fills through `writeLabels`. export function LabelPool({ count, pool, className, }: { count: number; pool: { current: (HTMLSpanElement | null)[] }; className?: string; }) { return ( <> {Array.from({ length: count }).map((_, i) => ( { pool.current[i] = el; }} aria-hidden="true" className={cn( "pointer-events-none absolute left-0 top-0 whitespace-nowrap opacity-0", className ?? "font-mono text-[10px] leading-none tabular-nums text-[color:var(--bjork-text-faint)] [text-box:trim-both_cap_alphabetic]", )} /> ))} ); } export interface TooltipContent { key: string; title?: ReactNode; rows: TooltipRow[]; } export interface TooltipHandle { /** Shows `content`, or hides with `null`. Same key is a no-op. */ set: (content: TooltipContent | null) => void; readonly el: HTMLDivElement | null; /** Measured size of the current content. */ readonly size: { w: number; h: number }; } // A tooltip that owns its state, so hovering re-renders only the tooltip, never the chart. // The chart positions it from its draw loop through `handle.el.style.transform`. export const HoverTooltip = forwardRef void; className?: string }>(function HoverTooltip( { onMeasure, className }, ref, ) { const [state, setState] = useState<{ content: TooltipContent | null; last: TooltipContent | null }>({ content: null, last: null }); const elRef = useRef(null); const size = useRef({ w: 0, h: 0 }); const onMeasureRef = useRef(onMeasure); useEffect(() => { onMeasureRef.current = onMeasure; }); useImperativeHandle( ref, () => ({ set: (content) => setState((prev) => { if ((prev.content?.key ?? null) === (content?.key ?? null)) return prev; return { content, last: content ?? prev.last }; }), get el() { return elRef.current; }, get size() { return size.current; }, }), [], ); useLayoutEffect(() => { const el = elRef.current; if (!el) return; size.current = { w: el.offsetWidth, h: el.offsetHeight }; onMeasureRef.current?.(); }, [state.last]); const shown = state.content ?? state.last; return ; }); export interface AnnouncerHandle { say: (message: string) => void; } // Polite live region with a 250ms trailing throttle, isolated from the chart's renders. export const ChartAnnouncer = forwardRef(function ChartAnnouncer({ ms = 250 }, ref) { const [message, setMessage] = useState(""); const at = useRef(0); const timer = useRef | null>(null); useEffect( () => () => { if (timer.current) clearTimeout(timer.current); }, [], ); useImperativeHandle( ref, () => ({ say: (text: string) => { const now = performance.now(); if (timer.current) clearTimeout(timer.current); if (now - at.current >= ms) { at.current = now; setMessage(text); } else { timer.current = setTimeout(() => { at.current = performance.now(); setMessage(text); }, ms); } }, }), [ms], ); return ; }); aa:Tccd,import type { CSSProperties } from "react"; import type { BjorkTone } from "./palette"; // The library surface (CANON.md §1). Values mirror app/globals.css :root and .dark. Change both together. export const BJORK_SURFACE = { light: { surface: "#fffcf6", surfaceMuted: "rgba(250, 246, 237, 0.94)", surfaceHover: "#f5efe3", surfaceActive: "#efe7d8", panel: "#f8f2e7", menu: "rgba(255, 252, 246, 0.98)", field: "rgba(255, 252, 246, 0.96)", fieldMuted: "rgba(248, 242, 231, 0.82)", fieldInset: "rgba(239, 231, 216, 0.72)", border: "#eee6db", borderMuted: "#f5ede2", borderStrong: "#e1d7c8", shadowSurface: "inset 0 7px 14px rgba(88, 72, 49, 0.045), inset 0 0.5px 0.5px rgba(255, 255, 255, 0.92), inset 1px 0 0 rgba(88, 72, 49, 0.026), inset -1px 0 0 rgba(255, 255, 255, 0.68), 0 14px 22px -9px rgba(66, 52, 33, 0.11)", shadowSoft: "inset 0 1px 0 rgba(88, 72, 49, 0.045), inset 0 0.5px 0.5px rgba(255, 255, 255, 0.86)", shadowPanel: "inset 0 1px 0 rgba(88, 72, 49, 0.04), inset 1px 0 0 rgba(88, 72, 49, 0.024), inset -1px 0 0 rgba(255, 255, 255, 0.64), 0 18px 38px -30px rgba(66, 52, 33, 0.2)", shadowMenu: "inset 0 1px 0 rgba(88, 72, 49, 0.04), inset 0 12px 24px rgba(88, 72, 49, 0.022), inset 1px 0 0 rgba(88, 72, 49, 0.024), inset -1px 0 0 rgba(255, 255, 255, 0.62), 0 22px 44px -26px rgba(66, 52, 33, 0.22)", shadowInset: "inset 0 1px 10px rgba(88, 72, 49, 0.12), inset 0 0.5px 0.5px rgba(255, 255, 255, 0.72)", }, dark: { surface: "#121212", surfaceMuted: "rgba(22, 22, 22, 0.92)", surfaceHover: "#161616", surfaceActive: "#202020", panel: "#0d0d0d", menu: "rgba(18, 18, 18, 0.98)", field: "rgba(18, 18, 18, 0.95)", fieldMuted: "rgba(18, 18, 18, 0.55)", fieldInset: "rgba(9, 9, 9, 0.75)", border: "#232323", borderMuted: "#1c1c1c", borderStrong: "#343434", shadowSurface: "inset 0 7px 14px rgba(255, 255, 255, 0.03), inset 0 0.5px 0.5px rgba(255, 255, 255, 0.06), 0 14px 20px -6px rgba(0, 0, 0, 0.45)", shadowSoft: "inset 0 1px 0 rgba(255, 255, 255, 0.045)", shadowPanel: "inset 0 1px 0 rgba(255, 255, 255, 0.035), 0 18px 36px -28px rgba(0, 0, 0, 0.9)", shadowMenu: "inset 0 1px 0 rgba(255, 255, 255, 0.055), inset 0 12px 24px rgba(255, 255, 255, 0.018), inset 0 -18px 26px rgba(0, 0, 0, 0.24), 0 22px 42px -22px rgba(0, 0, 0, 0.9)", shadowInset: "inset 0 1px 10px rgba(0, 0, 0, 0.45)", }, } as const; /** Writes the surface tokens for a pinned tone as --bjork-* custom properties. Spread first; kit-specific keys may override. */ export function surfaceVars(tone: BjorkTone): CSSProperties { const s = BJORK_SURFACE[tone]; return { "--bjork-surface": s.surface, "--bjork-surface-muted": s.surfaceMuted, "--bjork-surface-hover": s.surfaceHover, "--bjork-surface-active": s.surfaceActive, "--bjork-panel": s.panel, "--bjork-menu": s.menu, "--bjork-field": s.field, "--bjork-field-muted": s.fieldMuted, "--bjork-field-inset": s.fieldInset, "--bjork-border": s.border, "--bjork-border-muted": s.borderMuted, "--bjork-border-strong": s.borderStrong, "--bjork-shadow-surface": s.shadowSurface, "--bjork-shadow-soft": s.shadowSoft, "--bjork-shadow-panel": s.shadowPanel, "--bjork-shadow-menu": s.shadowMenu, "--bjork-shadow-inset": s.shadowInset, } as CSSProperties; } ab:T26b2,// Shared chart math for the Charts collection: nice ticks, scales, damping, colour and number formatting. // Pure functions only. Every chart imports what it needs by path. export function clamp(v: number, lo: number, hi: number): number { return v < lo ? lo : v > hi ? hi : v; } export function lerp(a: number, b: number, t: number): number { return a + (b - a) * t; } // Maps v from [d0, d1] to [r0, r1]. Degenerate domains map to the range midpoint. export function scaleLinear(d0: number, d1: number, r0: number, r1: number): (v: number) => number { const span = d1 - d0; if (!(Math.abs(span) > 1e-12)) return () => (r0 + r1) / 2; const k = (r1 - r0) / span; return (v: number) => r0 + (v - d0) * k; } // Frame-rate independent approach: moves `cur` toward `target` with time constant `tau` seconds. export function damp(cur: number, target: number, tau: number, dt: number): number { if (tau <= 0) return target; return target + (cur - target) * Math.exp(-dt / tau); } // A "nice" step (1, 2, 2.5 or 5 x 10^k) that splits `span` into roughly `count` intervals. export function niceStep(span: number, count = 5): number { if (!(span > 0) || !Number.isFinite(span)) return 1; const raw = span / Math.max(1, count); const mag = 10 ** Math.floor(Math.log10(raw)); const r = raw / mag; const m = r <= 1 ? 1 : r <= 2 ? 2 : r <= 2.5 ? 2.5 : r <= 5 ? 5 : 10; return m * mag; } // Tick values at a nice step, inclusive of the domain ends when they land on the step. export function niceTicks(lo: number, hi: number, count = 5): number[] { if (!(hi > lo)) return [lo]; const step = niceStep(hi - lo, count); const first = Math.ceil(lo / step - 1e-9); const last = Math.floor(hi / step + 1e-9); const out: number[] = []; for (let n = first; n <= last; n++) out.push(Number((n * step).toFixed(12))); return out; } // Expands [lo, hi] outward to the nearest nice step, so the outer gridlines sit on round values. export function niceDomain(lo: number, hi: number, count = 5): [number, number] { if (!(hi > lo)) { const pad = Math.max(Math.abs(hi) * 0.1, 1); return [lo - pad, hi + pad]; } const step = niceStep(hi - lo, count); return [Math.floor(lo / step + 1e-9) * step, Math.ceil(hi / step - 1e-9) * step]; } // Half-pixel snap for crisp 1px hairlines. export function crisp(v: number): number { return Math.round(v) + 0.5; } // --- Colour ------------------------------------------------------------------------------------- const rgbCache = new Map(); // Parses #rgb, #rrggbb and rgba()/rgb() strings. Returns [r, g, b, a]. export function parseColor(c: string): [number, number, number, number] { const hit = rgbCache.get(c); if (hit) return hit; let out: [number, number, number, number] = [0, 0, 0, 1]; const s = c.trim(); if (s.startsWith("#")) { let h = s.slice(1); if (h.length === 3) h = h.split("").map((ch) => ch + ch).join(""); const n = parseInt(h.slice(0, 6), 16); out = [(n >> 16) & 255, (n >> 8) & 255, n & 255, 1]; } else { const m = s.match(/rgba?$([^)]+)$/); if (m) { const p = m[1].split(",").map((x) => parseFloat(x)); out = [p[0] ?? 0, p[1] ?? 0, p[2] ?? 0, p[3] ?? 1]; } } rgbCache.set(c, out); return out; } // The colour at alpha `a`, multiplied with any alpha the colour already has. export function withAlpha(c: string, a: number): string { const [r, g, b, a0] = parseColor(c); return `rgba(${r},${g},${b},${+(a0 * a).toFixed(4)})`; } // Mixes two opaque colours in sRGB. t = 0 gives `a`. export function mixColor(a: string, b: string, t: number): string { const ca = parseColor(a); const cb = parseColor(b); const r = Math.round(lerp(ca[0], cb[0], t)); const g = Math.round(lerp(ca[1], cb[1], t)); const bl = Math.round(lerp(ca[2], cb[2], t)); return `rgb(${r},${g},${bl})`; } // --- Numbers ------------------------------------------------------------------------------------ const fmtCache = new Map(); function nf(opts: Intl.NumberFormatOptions): Intl.NumberFormat { const key = JSON.stringify(opts); let f = fmtCache.get(key); if (!f) { f = new Intl.NumberFormat("en-US", opts); fmtCache.set(key, f); } return f; } export function formatNumber(v: number, digits = 1): string { if (!Number.isFinite(v)) return "–"; return nf({ maximumFractionDigits: digits, minimumFractionDigits: 0 }).format(v); } export function formatFixed(v: number, digits = 2): string { if (!Number.isFinite(v)) return "–"; return nf({ maximumFractionDigits: digits, minimumFractionDigits: digits }).format(v); } // 1,284 / 12.9K / 4.2M. Uses a true minus sign. export function formatCompact(v: number, digits = 1): string { if (!Number.isFinite(v)) return "–"; const s = nf({ notation: "compact", maximumFractionDigits: digits }).format(Math.abs(v)); return v < 0 ? `−${s}` : s; } export function formatPercent(v: number, digits = 0): string { if (!Number.isFinite(v)) return "–"; const s = nf({ maximumFractionDigits: digits, minimumFractionDigits: digits }).format(Math.abs(v * 100)); return `${v < 0 ? "−" : ""}${s}%`; } // +1.2 / −0.8 / 0. Signed numbers use a true minus and an explicit plus. export function formatSigned(v: number, format: (n: number) => string = (n) => formatNumber(n)): string { if (!Number.isFinite(v)) return "–"; const body = format(Math.abs(v)); // A value that rounds to zero carries no sign. if (Math.abs(v) < 1e-12 || !/[1-9]/.test(body)) return body; return `${v > 0 ? "+" : "−"}${body}`; } // Gaussian kernel density at x for a sorted sample, bandwidth h. export function kde(sample: number[], x: number, h: number): number { const n = sample.length; if (!n || !(h > 0)) return 0; let s = 0; const inv = 1 / h; for (let i = 0; i < n; i++) { const u = (x - sample[i]) * inv; if (u > 4 || u < -4) continue; s += Math.exp(-0.5 * u * u); } return s / (n * h * Math.sqrt(2 * Math.PI)); } // Silverman's rule of thumb bandwidth. export function silverman(sample: number[]): number { const n = sample.length; if (n < 2) return 1; const mean = sample.reduce((a, b) => a + b, 0) / n; const sd = Math.sqrt(sample.reduce((a, b) => a + (b - mean) ** 2, 0) / (n - 1)); const sorted = [...sample].sort((a, b) => a - b); const iqr = quantile(sorted, 0.75) - quantile(sorted, 0.25); const spread = Math.min(sd, iqr / 1.34) || sd || 1; return 0.9 * spread * n ** -0.2; } // Linear-interpolated quantile of a sorted array. export function quantile(sorted: number[], q: number): number { const n = sorted.length; if (!n) return NaN; if (n === 1) return sorted[0]; const pos = clamp(q, 0, 1) * (n - 1); const lo = Math.floor(pos); const hi = Math.min(n - 1, lo + 1); return sorted[lo] + (sorted[hi] - sorted[lo]) * (pos - lo); } // Standard normal sample from a uniform source (Box-Muller). export function gaussian(rnd: () => number): number { const u = Math.max(rnd(), 1e-9); const v = rnd(); return Math.sqrt(-2 * Math.log(u)) * Math.cos(2 * Math.PI * v); } // --- Time --------------------------------------------------------------------------------------- const HOUR = 3600000; const DAY = 86400000; const timeFmt = { hour: new Intl.DateTimeFormat("en-US", { hour: "numeric", timeZone: "UTC" }), day: new Intl.DateTimeFormat("en-US", { month: "short", day: "numeric", timeZone: "UTC" }), month: new Intl.DateTimeFormat("en-US", { month: "short", timeZone: "UTC" }), monthYear: new Intl.DateTimeFormat("en-US", { month: "short", year: "2-digit", timeZone: "UTC" }), year: new Intl.DateTimeFormat("en-US", { year: "numeric", timeZone: "UTC" }), }; export interface TimeTick { t: number; label: string; } // Calendar-aligned ticks (UTC) for [t0, t1] drawn across `px` pixels, at least `minPx` apart. export function timeTicks(t0: number, t1: number, px: number, minPx = 64): TimeTick[] { const span = t1 - t0; if (!(span > 0) || !(px > 0)) return []; const maxTicks = Math.max(1, Math.floor(px / minPx)); const perTick = span / maxTicks; const out: TimeTick[] = []; const hourSteps = [1, 2, 3, 6, 12]; for (const k of hourSteps) { if (k * HOUR >= perTick) { const step = k * HOUR; for (let t = Math.ceil(t0 / step) * step; t <= t1; t += step) { const d = new Date(t); out.push({ t, label: d.getUTCHours() === 0 ? timeFmt.day.format(t) : timeFmt.hour.format(t) }); } return out; } } const daySteps = [1, 2, 3, 7, 14]; for (const k of daySteps) { if (k * DAY >= perTick) { const step = k * DAY; // Weekly steps land on Mondays. const offset = k === 7 || k === 14 ? 4 * DAY : 0; for (let t = Math.ceil((t0 - offset) / step) * step + offset; t <= t1; t += step) out.push({ t, label: timeFmt.day.format(t) }); return out; } } const monthSteps = [1, 2, 3, 6, 12, 24, 60]; for (const k of monthSteps) { if (k * 30.44 * DAY >= perTick) { const d0 = new Date(t0); let y = d0.getUTCFullYear(); let m = d0.getUTCMonth(); // First boundary at or after t0 that is a multiple of k months. m = Math.ceil(m / k) * k; for (;;) { y += Math.floor(m / 12); m %= 12; const t = Date.UTC(y, m, 1); if (t > t1) break; if (t >= t0) { const label = k >= 12 ? timeFmt.year.format(t) : m === 0 ? timeFmt.monthYear.format(t) : timeFmt.month.format(t); out.push({ t, label }); } m += k; } return out; } } return out; } export function formatDateUTC(t: number, style: "day" | "full" = "day"): string { if (style === "full") return new Date(t).toLocaleDateString("en-US", { weekday: "short", month: "short", day: "numeric", year: "numeric", timeZone: "UTC" }); return timeFmt.day.format(t); } 7e:["$","$La1",null,{"files":[{"path":"components/bjork-ui/charts/drawdown-chart.tsx","content":"$a2","type":"registry:component","target":"@components/bjork-ui/charts/drawdown-chart.tsx"},{"path":"lib/utils.ts","content":"import { clsx, type ClassValue } from \"clsx\"\nimport { twMerge } from \"tailwind-merge\"\n\nexport function cn(...inputs: ClassValue[]) {\n return twMerge(clsx(inputs))\n}\n","type":"registry:lib","target":"@lib/utils.ts"},{"path":"components/bjork-ui/_core/palette.ts","content":"$a3","type":"registry:component","target":"@components/bjork-ui/_core/palette.ts"},{"path":"components/bjork-ui/_core/random.ts","content":"$a4","type":"registry:component","target":"@components/bjork-ui/_core/random.ts"},{"path":"components/bjork-ui/charts/_kit/canvas.ts","content":"$a5","type":"registry:component","target":"@components/bjork-ui/charts/_kit/canvas.ts"},{"path":"components/bjork-ui/_core/loop.ts","content":"$a6","type":"registry:component","target":"@components/bjork-ui/_core/loop.ts"},{"path":"components/bjork-ui/_core/canvas.ts","content":"$a7","type":"registry:component","target":"@components/bjork-ui/_core/canvas.ts"},{"path":"components/bjork-ui/_core/motion.ts","content":"$a8","type":"registry:component","target":"@components/bjork-ui/_core/motion.ts"},{"path":"components/bjork-ui/charts/_kit/chrome.tsx","content":"$a9","type":"registry:component","target":"@components/bjork-ui/charts/_kit/chrome.tsx"},{"path":"components/bjork-ui/_core/tone.ts","content":"\"use client\";\n\nimport { useSyncExternalStore } from \"react\";\nimport { useTheme } from \"next-themes\";\nimport type { BjorkTone } from \"./palette\";\n\nconst subscribeNoop = () => () => {};\nconst getMounted = () => true;\nconst getServerMounted = () => false;\n\n/**\n * Resolves the tone for a component. An explicit `tone` always wins.\n * Otherwise it follows next-themes' resolved theme, but only after mount,\n * so the server render and first client render agree on dark.\n */\nexport function useBjorkTone(tone?: BjorkTone): BjorkTone {\n const { resolvedTheme } = useTheme();\n const mounted = useSyncExternalStore(subscribeNoop, getMounted, getServerMounted);\n if (tone) return tone;\n if (!mounted) return \"dark\";\n return resolvedTheme === \"light\" ? \"light\" : \"dark\";\n}\n","type":"registry:component","target":"@components/bjork-ui/_core/tone.ts"},{"path":"components/bjork-ui/_core/a11y.tsx","content":"import type { ReactNode } from \"react\";\n\n// Text for assistive tech only.\nexport function VisuallyHidden({ children }: { children: ReactNode }) {\n return {children};\n}\n\n// Announces `message` when it changes. 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