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import { motion, useReducedMotion } from "motion/react" import { cn } from "@/lib/utils" const EASE = [0.16, 1, 0.3, 1] as const const ACCENT: [number, number, number] = [72, 159, 250] const AMBER = "var(--chart-amber)" const GREEN = "var(--chart-up)" const RED = "var(--chart-down)" const SANS = "inherit" const SURFACE = "var(--card)" const accentRgba = (a: number, c: [number, number, number] = ACCENT) => `rgba(${c[0]},${c[1]},${c[2]},${a})` const W = 400 const H = 190 const PAD = { r: 48 } /** deterministic default series — a drifting daily close */ const DEFAULT_PRICES: number[] = (() => { let s = 61 let v = 150 const out: number[] = [] for (let i = 0; i < 120; i++) { s = (s * 16807) % 2147483647 v = Math.max(120, v + ((s / 2147483647) - 0.46) * 4.2) out.push(v) } return out })() const smaOf = (data: number[], win: number) => data.map((_, i) => { const from = Math.max(0, i - win + 1) const slice = data.slice(from, i + 1) return slice.reduce((a, b) => a + b, 0) / slice.length }) export interface SmaChartProps { /** ticker shown top-left */ symbol?: string /** company name beside the ticker */ name?: string /** price series, oldest → latest (the two SMAs derive from it) */ prices?: number[] className?: string } /** * Moving-average chart: one price line with its fast and slow SMA overlays, * right-edge price ticks, crosshair scrubbing with a three-series tooltip, * and a summary row — last price left, signed 30-bar change chip right. */ export function SmaChart({ symbol = "AMZN", name = "Amazon.com Inc.", prices = DEFAULT_PRICES, className }: SmaChartProps) { const reduced = useReducedMotion() const svgRef = useRef(null) const [hover, setHover] = useState(null) const { n, price, fast, slow, min, max, x, y, path } = useMemo(() => { const price = prices const n = price.length const fast = smaOf(price, 14) const slow = smaOf(price, 45) const all = [...price, ...fast, ...slow] const min = Math.min(...all) const max = Math.max(...all) const x = (i: number) => (i / (n - 1)) * (W - PAD.r) const y = (v: number) => 8 + (1 - (v - min) / (max - min || 1)) * (H - 16) const path = (d: number[]) => d.map((v, i) => `${i === 0 ? "M" : "L"}${x(i).toFixed(1)},${y(v).toFixed(1)}`).join(" ") return { n, price, fast, slow, min, max, x, y, path } }, [prices]) const last = price[n - 1] const base = price[Math.max(0, n - 30)] const change = last - base const pct = (change / base) * 100 const up = change >= 0 const hue = up ? GREEN : RED const onMove = (e: React.PointerEvent) => { const r = svgRef.current?.getBoundingClientRect() if (!r) return const px = ((e.clientX - r.left) / r.width) * W setHover(Math.max(0, Math.min(n - 1, Math.round((px / (W - PAD.r)) * (n - 1))))) } return (

{symbol} {name} 60 SMA 200 SMA

{/* tooltip — price + both averages at the hovered bar */} {hover != null && (

bar {hover + 1} / {n}

Price ${price[hover].toFixed(2)}

60 SMA ${fast[hover].toFixed(2)}

200 SMA ${slow[hover].toFixed(2)}

)}

{/* summary row */}

${last.toFixed(2)} {up ? "+" : "−"}${Math.abs(change).toFixed(2)} {up ? "+" : "−"} {Math.abs(pct).toFixed(2)}%

) } 64:["$","$L70",null,{"files":[{"path":"components/ui/sma-chart.tsx","content":"$71","type":"registry:ui","target":"components/ui/sma-chart.tsx"}],"className":"h-[70svh] min-h-80"}]