61: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"] 62:T61f5,import { useEffect, useRef, useState } from "react"; import type { KeyboardEvent as ReactKeyboardEvent } from "react"; // Everything a visitor is likely to change sits here. const dial = { title: "WEEKLY ORDERS", maker: "HALE & ORCHARD", noun: "orders" }; const MIN = 0, MAX = 600; // the two ends of the printed scale const STEP = 10; // one press of an arrow key moves the set hand this far const bands = [{ at: 75, word: "SLOW" }, { at: 225, word: "STEADY" }, { at: 375, word: "BRISK" }, { at: 525, word: "RUSH" }]; const readings = [412, 436, 398, 455, 471, 428]; // the needle visits these in turn const START_TARGET = 380; // where the brass set hand is parked const HOLD = 3800; // milliseconds between readings const W0 = 8.5, ZETA = 0.3; // how fast the needle swings and how soon it settles const W = 600, H = 640, CX = 300, CY = 328, RO = 250, RD = 201; // canvas, centre, case radius, dial radius const TAU = Math.PI * 2; const clamp = (v: number, lo: number, hi: number) => Math.max(lo, Math.min(hi, v)); const ang = (v: number) => ((-135 + (270 * (v - MIN)) / (MAX - MIN)) * Math.PI) / 180; // 0 is straight up export default function BrassAneroidBarometerGauge() { const canvas = useRef(null); const knobHit = useRef(null); const [idx, setIdx] = useState(0); const [target, setTarget] = useState(START_TARGET); const [said, setSaid] = useState(""); const live = useRef({ reading: readings[0], target: START_TARGET, touched: 0 }); const api = useRef<{ poke: (kick?: boolean) => void } | null>(null); const reading = readings[idx]; live.current.reading = reading; useEffect(() => { if (window.matchMedia("(prefers-reduced-motion: reduce)").matches) return; const id = window.setInterval(() => { if (document.hidden || performance.now() - live.current.touched < HOLD) return; setIdx((i) => (i + 1) % readings.length); api.current?.poke(); }, HOLD); return () => window.clearInterval(id); }, []); useEffect(() => { const cv = canvas.current, pad = knobHit.current; if (!cv || !pad) return; const ctx = cv.getContext("2d"); if (!ctx) return; const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches; const hasConic = typeof ctx.createConicGradient === "function"; let k = 1; // canvas pixels per design pixel const brass = (c: CanvasRenderingContext2D, x: number, y: number, r: number, turn: number) => { if (!hasConic) { const g = c.createLinearGradient(x - r, y - r, x + r, y + r); g.addColorStop(0, "#fff0bd"); g.addColorStop(0.3, "#c79a3c"); g.addColorStop(0.55, "#f3d584"); g.addColorStop(0.8, "#7a5616"); g.addColorStop(1, "#c79a3c"); return g; } const g = c.createConicGradient(turn, x, y); const stops: [number, string][] = [[0, "#fffbe4"], [0.04, "#f0cd76"], [0.13, "#a97824"], [0.25, "#5b3d0c"], [0.34, "#b08028"], [0.44, "#f4d886"], [0.5, "#fffbe6"], [0.56, "#dbae4e"], [0.7, "#66460f"], [0.8, "#a27522"], [0.92, "#ecc96e"], [1, "#fffbe4"]]; for (const [o, col] of stops) g.addColorStop(o, col); return g; }; const ring = (c: CanvasRenderingContext2D, r1: number, r0: number) => { c.beginPath(); c.arc(CX, CY, r1, 0, TAU); c.arc(CX, CY, r0, 0, TAU, true); c.closePath(); }; const at = (a: number, r: number): [number, number] => [CX + Math.sin(a) * r, CY - Math.cos(a) * r]; const spaced = (c: CanvasRenderingContext2D, text: string, x: number, y: number, gap: number) => { const ws = [...text].map((ch) => c.measureText(ch).width + gap); let px = x - (ws.reduce((p, q) => p + q, 0) - gap) / 2; c.textAlign = "left"; [...text].forEach((ch, i) => { c.fillText(ch, px, y); px += ws[i]; }); }; const curved = (c: CanvasRenderingContext2D, text: string, mid: number, r: number, gap: number) => { const ws = [...text].map((ch) => c.measureText(ch).width + gap); let a = mid - (ws.reduce((p, q) => p + q, 0) - gap) / r / 2; c.textAlign = "center"; [...text].forEach((ch, i) => { const ac = a + (ws[i] - gap) / r / 2, [x, y] = at(ac, r); c.save(); c.translate(x, y); c.rotate(ac); c.fillText(ch, 0, 0); c.restore(); a += ws[i] / r; }); }; // Layer 1: case, bezel and printed dial. None of it moves, so it is painted once. const base = document.createElement("canvas"); const build = () => { const b = base.getContext("2d"); if (!b) return; base.width = cv.width; base.height = cv.height; b.setTransform(k, 0, 0, k, 0, 0); const SERIF = 'Georgia, "Times New Roman", Times, serif'; // Shadows on the wall: one wide and soft, one tight under the case. for (const [blur, ox, oy, al] of [[46, 18, 34, 0.8], [12, 4, 7, 0.7]]) { b.save(); b.shadowColor = `rgba(0,0,0,${al})`; b.shadowBlur = blur * k; b.shadowOffsetX = ox * k; b.shadowOffsetY = oy * k; b.beginPath(); b.arc(CX, CY, RO - 2, 0, TAU); b.fillStyle = "#2a1c06"; b.fill(); b.restore(); } // The hanging loop and its lug. const ly = CY - RO - 20; b.save(); b.shadowColor = "rgba(0,0,0,0.5)"; b.shadowBlur = 8 * k; b.shadowOffsetX = 5 * k; b.shadowOffsetY = 9 * k; b.beginPath(); b.arc(CX, ly, 15, 0, TAU); b.lineWidth = 6; b.strokeStyle = brass(b, CX, ly, 18, -2.2); b.stroke(); b.restore(); b.beginPath(); b.arc(CX, ly, 17.2, Math.PI * 1.05, Math.PI * 1.6); b.lineWidth = 1; b.strokeStyle = "rgba(255,255,255,0.7)"; b.stroke(); b.beginPath(); b.arc(CX, ly, 12.4, Math.PI * 0.1, Math.PI * 0.6); b.lineWidth = 1; b.strokeStyle = "rgba(40,20,0,0.5)"; b.stroke(); b.beginPath(); b.arc(CX, CY - RO + 2, 11, Math.PI, 0); b.fillStyle = brass(b, CX, CY - RO, 12, -2.4); b.fill(); b.beginPath(); b.arc(CX, ly - 15.5, 2.6, 0, TAU); b.fillStyle = "#1a1408"; b.fill(); // the pin it hangs on // Case: a rolled outer edge, a coin-milled band, a sloped bezel and the seat for the glass. b.beginPath(); b.arc(CX, CY, RO, 0, TAU); b.fillStyle = brass(b, CX, CY, RO, -2.25); b.fill(); const roll = b.createRadialGradient(CX, CY, RO - 15, CX, CY, RO); roll.addColorStop(0, "rgba(40,22,0,0.7)"); roll.addColorStop(0.22, "rgba(40,22,0,0.05)"); roll.addColorStop(0.5, "rgba(255,250,224,0.42)"); roll.addColorStop(0.8, "rgba(40,22,0,0.1)"); roll.addColorStop(1, "rgba(24,12,0,0.75)"); ring(b, RO, RO - 15); b.fillStyle = roll; b.fill(); b.save(); b.lineCap = "round"; b.shadowColor = "rgba(255,250,220,0.9)"; b.shadowBlur = 6 * k; b.beginPath(); b.arc(CX, CY, RO - 7.5, Math.PI * 1.08, Math.PI * 1.46); b.lineWidth = 2.2; b.strokeStyle = "rgba(255,253,240,0.85)"; b.stroke(); b.beginPath(); b.arc(CX, CY, RO - 7.5, Math.PI * 0.12, Math.PI * 0.34); b.lineWidth = 1.6; b.strokeStyle = "rgba(255,246,214,0.45)"; b.stroke(); b.restore(); ring(b, RO - 15, RO - 26); b.fillStyle = "rgba(40,24,2,0.84)"; b.fill(); for (let i = 0; i < 200; i++) { const a = (i / 200) * TAU, lit = Math.max(0, Math.cos(a + Math.PI * 0.75)), back = Math.pow(Math.max(0, Math.cos(a - Math.PI * 0.25)), 3); b.beginPath(); b.moveTo(CX + Math.cos(a) * (RO - 25.4), CY + Math.sin(a) * (RO - 25.4)); b.lineTo(CX + Math.cos(a) * (RO - 15.6), CY + Math.sin(a) * (RO - 15.6)); b.lineWidth = 1.7; b.strokeStyle = `rgba(255,232,160,${Math.min(1, 0.12 + 0.88 * lit + 0.5 * back)})`; b.stroke(); } ring(b, RO - 26, RD + 5); b.fillStyle = brass(b, CX, CY, RO, 0.95); b.fill(); const slope = b.createRadialGradient(CX, CY, RD + 5, CX, CY, RO - 26); slope.addColorStop(0, "rgba(30,15,0,0.62)"); slope.addColorStop(0.2, "rgba(30,15,0,0.12)"); slope.addColorStop(0.62, "rgba(255,250,224,0.2)"); slope.addColorStop(1, "rgba(30,15,0,0.5)"); ring(b, RO - 26, RD + 5); b.fillStyle = slope; b.fill(); b.save(); b.lineCap = "round"; b.shadowColor = "rgba(255,250,220,0.8)"; b.shadowBlur = 10 * k; b.beginPath(); b.arc(CX, CY, (RO - 26 + RD + 5) / 2 + 1, Math.PI * 1.12, Math.PI * 1.42); b.lineWidth = 7; b.strokeStyle = "rgba(255,250,225,0.5)"; b.stroke(); b.beginPath(); b.arc(CX, CY, (RO - 26 + RD + 5) / 2 + 1, Math.PI * 0.16, Math.PI * 0.36); b.lineWidth = 5; b.strokeStyle = "rgba(255,244,205,0.3)"; b.stroke(); b.restore(); b.beginPath(); b.arc(CX, CY, RO - 26, Math.PI * 0.95, Math.PI * 1.6); b.lineWidth = 1; b.strokeStyle = "rgba(255,255,255,0.55)"; b.stroke(); const seat = b.createRadialGradient(CX, CY, RD, CX, CY, RD + 5); seat.addColorStop(0, "#120c03"); seat.addColorStop(1, "#5c4011"); ring(b, RD + 5, RD - 1); b.fillStyle = seat; b.fill(); // Silvered dial with a faint spun grain, shaded where the bezel stands over it. const face = b.createRadialGradient(CX - 46, CY - 66, 20, CX, CY, RD); face.addColorStop(0, "#fdfaf0"); face.addColorStop(0.55, "#f1ead6"); face.addColorStop(1, "#d8cdae"); b.beginPath(); b.arc(CX, CY, RD, 0, TAU); b.fillStyle = face; b.fill(); b.save(); b.beginPath(); b.arc(CX, CY, RD, 0, TAU); b.clip(); for (let r = 4; r < RD; r += 2.2) { b.beginPath(); b.arc(CX, CY, r, 0, TAU); b.lineWidth = 0.6; b.strokeStyle = (r / 2.2) % 2 < 1 ? "rgba(255,255,255,0.2)" : "rgba(90,70,30,0.05)"; b.stroke(); } b.shadowColor = "rgba(40,24,0,0.6)"; b.shadowBlur = 16 * k; b.shadowOffsetX = 7 * k; b.shadowOffsetY = 11 * k; b.beginPath(); b.arc(CX, CY, RD + 12, 0, TAU); b.lineWidth = 22; b.strokeStyle = "#000"; b.stroke(); b.restore(); // The printed scale. const INK = "#1d1710", R1 = RD - 15, R0 = R1 - 12; b.lineCap = "butt"; for (const r of [R1, R0]) { b.beginPath(); b.arc(CX, CY, r, ang(MIN) - Math.PI / 2, ang(MAX) - Math.PI / 2); b.lineWidth = r === R1 ? 1.5 : 0.8; b.strokeStyle = INK; b.stroke(); } b.textBaseline = "middle"; b.fillStyle = INK; for (let v = MIN; v <= MAX + 0.001; v += 10) { const a = ang(v), big = v % 100 === 0, mid = v % 50 === 0; const [x0, y0] = at(a, R1), [x1, y1] = at(a, big ? R0 - 9 : mid ? R0 - 5 : R0); b.beginPath(); b.moveTo(x0, y0); b.lineTo(x1, y1); b.lineWidth = big ? 2.2 : mid ? 1.3 : 0.8; b.strokeStyle = INK; b.stroke(); if (big) { const [x, y] = at(a, R0 - 27); b.font = `700 19px ${SERIF}`; b.textAlign = "center"; b.fillText(String(v), x, y); } } b.font = `700 12.5px ${SERIF}`; b.fillStyle = "#2a2118"; for (const band of bands) curved(b, band.word, ang(band.at), R0 - 63, 3.2); // Dividers between the words, as on a weather dial. for (const v of [150, 300, 450]) { const [x0, y0] = at(ang(v), R0 - 55), [x1, y1] = at(ang(v), R0 - 70); b.beginPath(); b.moveTo(x0, y0); b.lineTo(x1, y1); b.lineWidth = 0.8; b.strokeStyle = "rgba(29,23,16,0.6)"; b.stroke(); } for (const [r, w] of [[R0 - 80, 1.2], [R0 - 83.5, 0.6]]) { b.beginPath(); b.arc(CX, CY, r, 0, TAU); b.lineWidth = w; b.strokeStyle = "rgba(29,23,16,0.75)"; b.stroke(); } // Two blued screws hold the dial to the movement. for (const sx of [CX - 62, CX + 62]) { b.beginPath(); b.arc(sx, CY + 0.8, 4.4, 0, TAU); b.fillStyle = "rgba(60,40,0,0.35)"; b.fill(); const sg = b.createRadialGradient(sx - 1.2, CY - 1.4, 0.4, sx, CY, 4); sg.addColorStop(0, "#8fb0ee"); sg.addColorStop(0.45, "#2b4686"); sg.addColorStop(1, "#0c1630"); b.beginPath(); b.arc(sx, CY, 3.8, 0, TAU); b.fillStyle = sg; b.fill(); b.save(); b.translate(sx, CY); b.rotate(sx * 0.4); b.fillStyle = "rgba(4,8,20,0.9)"; b.fillRect(-3.4, -0.6, 6.8, 1.2); b.restore(); } b.fillStyle = INK; b.font = `700 12px ${SERIF}`; spaced(b, dial.title, CX, CY + 126, 2.6); b.fillStyle = "rgba(29,23,16,0.72)"; b.font = `600 7.5px ${SERIF}`; spaced(b, dial.maker, CX, CY + 144, 2.2); b.beginPath(); b.moveTo(CX - 20, CY + 135.5); b.lineTo(CX + 20, CY + 135.5); b.lineWidth = 0.6; b.strokeStyle = "rgba(29,23,16,0.6)"; b.stroke(); }; const fit = () => { const w = cv.clientWidth || W; k = (w / W) * Math.min(2, window.devicePixelRatio || 1); cv.width = Math.round(W * k); cv.height = Math.round(H * k); build(); }; // x is the needle's reading and v its speed. tg is where the set hand is drawn. const s = { x: MIN, v: 0, tg: live.current.target, light: -0.2, lightTo: -0.2 }; const needle = (a: number) => { ctx.save(); ctx.translate(CX, CY); ctx.rotate(a); ctx.shadowColor = "rgba(52,32,0,0.42)"; ctx.shadowBlur = 5 * k; ctx.shadowOffsetX = 5 * k; ctx.shadowOffsetY = 8 * k; const steel = ctx.createLinearGradient(-4, 0, 4, 0); steel.addColorStop(0, "#0c1630"); steel.addColorStop(0.42, "#33528f"); steel.addColorStop(0.6, "#1a2c57"); steel.addColorStop(1, "#080f22"); ctx.fillStyle = steel; ctx.beginPath(); ctx.moveTo(0, -R_TIP); ctx.lineTo(4.6, -R_TIP + 26); ctx.lineTo(1.3, -R_TIP + 22); ctx.lineTo(3, 0); ctx.lineTo(1.8, 36); ctx.lineTo(-1.8, 36); ctx.lineTo(-3, 0); ctx.lineTo(-1.3, -R_TIP + 22); ctx.lineTo(-4.6, -R_TIP + 26); ctx.closePath(); ctx.fill(); // The counterweight: an open crescent on the tail. ctx.beginPath(); ctx.arc(0, 47, 12, 0, TAU); ctx.arc(0, 43.5, 7.5, 0, TAU, true); ctx.fill("evenodd"); ctx.shadowColor = "transparent"; ctx.beginPath(); ctx.moveTo(-0.7, -R_TIP + 20); ctx.lineTo(-1.6, -4); ctx.lineWidth = 0.6; ctx.strokeStyle = "rgba(150,190,255,0.75)"; ctx.stroke(); ctx.beginPath(); ctx.arc(0, 47, 11.4, Math.PI * 1.1, Math.PI * 1.6); ctx.lineWidth = 0.6; ctx.stroke(); ctx.restore(); }; const R_TIP = RD - 22; const setHand = (a: number) => { ctx.save(); ctx.translate(CX, CY); ctx.rotate(a); // It rides on the glass, well clear of the dial, so its shadow falls further away and softer. ctx.shadowColor = "rgba(52,32,0,0.3)"; ctx.shadowBlur = 9 * k; ctx.shadowOffsetX = 10 * k; ctx.shadowOffsetY = 16 * k; const g = ctx.createLinearGradient(-5, 0, 5, 0); g.addColorStop(0, "#6a480e"); g.addColorStop(0.38, "#f0cc6c"); g.addColorStop(0.6, "#b58222"); g.addColorStop(1, "#553909"); ctx.fillStyle = g; const tip = RD - 26; ctx.beginPath(); ctx.moveTo(-2, 0); ctx.lineTo(-1.25, -tip + 28); ctx.lineTo(-6.6, -tip + 16); ctx.lineTo(0, -tip); ctx.lineTo(6.6, -tip + 16); ctx.lineTo(1.25, -tip + 28); ctx.lineTo(2, 0); ctx.closePath(); ctx.moveTo(0, -tip + 9); ctx.lineTo(-2.7, -tip + 16.4); ctx.lineTo(0, -tip + 22); ctx.lineTo(2.7, -tip + 16.4); ctx.closePath(); ctx.fill("evenodd"); ctx.restore(); }; const knob = (a: number) => { const la = -2.3 + s.light * 0.4; ctx.save(); ctx.shadowColor = "rgba(30,18,0,0.6)"; ctx.shadowBlur = 13 * k; ctx.shadowOffsetX = 7 * k; ctx.shadowOffsetY = 12 * k; ctx.beginPath(); ctx.arc(CX, CY, 22, 0, TAU); ctx.fillStyle = "#4a3208"; ctx.fill(); ctx.restore(); const teeth = 34, step = TAU / teeth; for (let i = 0; i < teeth; i++) { const t0 = a + i * step, f = Math.cos(t0 - la - Math.PI / 2), lit = 0.5 + 0.5 * f, glint = Math.pow(Math.max(0, f), 6); for (let h = 0; h < 2; h++) { const a0 = t0 + h * step * 0.5 - Math.PI / 2, a1 = a0 + step * 0.5 + 0.004; const v = h === 0 ? 0.36 + lit * 0.5 + glint * 0.5 : 0.14 + lit * 0.2; ctx.beginPath(); ctx.arc(CX, CY, h === 0 ? 23 : 21, a0, a1); ctx.arc(CX, CY, 14, a1, a0, true); ctx.closePath(); ctx.fillStyle = `rgb(${Math.min(255, 255 * v) | 0},${Math.min(255, 206 * v) | 0},${Math.min(255, 104 * v) | 0})`; ctx.fill(); } } ctx.beginPath(); ctx.arc(CX, CY, 16.4, 0, TAU); ctx.fillStyle = "#3c2806"; ctx.fill(); ctx.beginPath(); ctx.arc(CX, CY, 15.4, 0, TAU); ctx.fillStyle = brass(ctx, CX, CY, 16, la); ctx.fill(); for (let r = 2.5; r < 15; r += 1.7) { ctx.beginPath(); ctx.arc(CX, CY, r, 0, TAU); ctx.lineWidth = 0.5; ctx.strokeStyle = (r / 1.7) % 2 < 1 ? "rgba(255,255,255,0.22)" : "rgba(60,36,0,0.16)"; ctx.stroke(); } ctx.beginPath(); ctx.arc(CX, CY, 15, 0, TAU); ctx.lineWidth = 0.7; ctx.strokeStyle = "rgba(255,248,214,0.7)"; ctx.stroke(); ctx.save(); ctx.translate(CX, CY); ctx.rotate(a); ctx.beginPath(); ctx.arc(0, -9.6, 1.9, 0, TAU); ctx.fillStyle = "#231704"; ctx.fill(); ctx.restore(); }; const glass = () => { const sl = s.light; ctx.save(); ctx.beginPath(); ctx.arc(CX, CY, RD, 0, TAU); ctx.clip(); const edge = ctx.createRadialGradient(CX, CY, RD * 0.8, CX, CY, RD); edge.addColorStop(0, "rgba(40,24,0,0)"); edge.addColorStop(1, "rgba(40,24,0,0.2)"); ctx.fillStyle = edge; ctx.fillRect(CX - RD, CY - RD, RD * 2, RD * 2); const bloom = ctx.createRadialGradient(CX - 78 + sl * 46, CY - 112, 6, CX - 60 + sl * 46, CY - 90, 190); bloom.addColorStop(0, "rgba(255,255,255,0.3)"); bloom.addColorStop(0.4, "rgba(255,255,255,0.08)"); bloom.addColorStop(1, "rgba(255,255,255,0)"); ctx.fillStyle = bloom; ctx.fillRect(CX - RD, CY - RD, RD * 2, RD * 2); // The crescent a domed glass throws back from a window. const a0 = Math.PI * (1.06 + sl * 0.1), a1 = Math.PI * (1.6 + sl * 0.1); const cres = ctx.createLinearGradient(CX - RD, CY - RD, CX, CY); cres.addColorStop(0, "rgba(255,255,255,0.8)"); cres.addColorStop(1, "rgba(255,255,255,0.04)"); ctx.beginPath(); ctx.arc(CX, CY, RD - 7, a0, a1); ctx.arc(CX + 15, CY + 20, RD - 7, a1 - 0.07, a0 + 0.1, true); ctx.closePath(); ctx.fillStyle = cres; ctx.fill(); ctx.beginPath(); ctx.arc(CX, CY, RD - 5, Math.PI * (0.08 + sl * 0.06), Math.PI * (0.42 + sl * 0.06)); ctx.lineWidth = 2.4; ctx.lineCap = "round"; ctx.strokeStyle = "rgba(255,255,255,0.22)"; ctx.stroke(); // Four window panes, bent a little by the curve of the glass. const wx = CX + 58 + sl * 38, wy = CY - 132; ctx.fillStyle = "rgba(255,255,255,0.13)"; for (let i = 0; i < 2; i++) for (let j = 0; j < 2; j++) { const x = wx + i * 27 + j * 5, y = wy + j * 31 + i * 7; ctx.beginPath(); ctx.moveTo(x, y); ctx.lineTo(x + 23, y + 6); ctx.lineTo(x + 27, y + 33); ctx.lineTo(x + 4.5, y + 27); ctx.closePath(); ctx.fill(); } ctx.restore(); }; const draw = () => { ctx.setTransform(1, 0, 0, 1, 0, 0); ctx.clearRect(0, 0, cv.width, cv.height); ctx.drawImage(base, 0, 0); ctx.setTransform(k, 0, 0, k, 0, 0); needle(ang(s.x)); setHand(ang(s.tg)); knob(ang(s.tg)); glass(); }; let raf = 0, last = 0, seen = true, moved = -1e9; const frame = (now: number) => { raf = 0; if (!last) last = now; const dt = Math.min(0.04, (now - last) / 1000); last = now; const span = MAX - MIN; for (let i = 0; i < 4; i++) { const h = dt / 4; s.v += (W0 * W0 * (live.current.reading - s.x) - 2 * ZETA * W0 * s.v) * h; s.x += s.v * h; // End pins: the needle taps them and comes back off. if (s.x > MAX + span * 0.03) { s.x = MAX + span * 0.03; s.v *= -0.3; } if (s.x < MIN - span * 0.03) { s.x = MIN - span * 0.03; s.v *= -0.3; } } s.tg += (live.current.target - s.tg) * Math.min(1, dt * 16); if (now - moved > 2500) s.lightTo = 0.5 * Math.sin(now / 2100) - 0.1; s.light += (s.lightTo - s.light) * Math.min(1, dt * 5); draw(); if (seen && !document.hidden) raf = requestAnimationFrame(frame); }; const still = () => { s.x = live.current.reading; s.v = 0; s.tg = live.current.target; draw(); }; const wake = (kick?: boolean) => { if (reduce) { still(); return; } if (kick) s.v += (Math.random() < 0.5 ? -1 : 1) * (220 + Math.random() * 120); // a knuckle on the glass if (!raf) { last = 0; raf = requestAnimationFrame(frame); } }; api.current = { poke: wake }; fit(); wake(); // The knob in the middle of the glass turns the set hand. let drag = false, lastA = 0, val = 0; const angleAt = (e: PointerEvent) => { const r = pad.getBoundingClientRect(); return Math.atan2(e.clientX - (r.left + r.width / 2), -(e.clientY - (r.top + r.height / 2))); }; const onDown = (e: PointerEvent) => { drag = true; lastA = angleAt(e); val = live.current.target; pad.setPointerCapture(e.pointerId); e.preventDefault(); }; const onMove = (e: PointerEvent) => { if (!drag) return; const a = angleAt(e); let d = a - lastA; if (d > Math.PI) d -= TAU; if (d < -Math.PI) d += TAU; lastA = a; val = clamp(val + (d / ((270 * Math.PI) / 180)) * (MAX - MIN), MIN, MAX); const next = Math.round(val / STEP) * STEP; if (next !== live.current.target) { live.current.target = next; live.current.touched = performance.now(); setTarget(next); wake(); } }; const onUp = () => { drag = false; }; const onLight = (e: PointerEvent) => { const r = cv.getBoundingClientRect(); moved = performance.now(); s.lightTo = clamp(((e.clientX - r.left) / r.width) * 2 - 1, -1, 1); }; pad.addEventListener("pointerdown", onDown); pad.addEventListener("pointermove", onMove); pad.addEventListener("pointerup", onUp); pad.addEventListener("pointercancel", onUp); const host = cv.parentElement; host?.addEventListener("pointermove", onLight); const ro = new ResizeObserver(() => { fit(); if (reduce) still(); else draw(); }); ro.observe(cv); const io = new IntersectionObserver(([entry]) => { seen = entry.isIntersecting; if (seen) wake(); }); io.observe(cv); const onVis = () => { if (!document.hidden) wake(); }; document.addEventListener("visibilitychange", onVis); return () => { cancelAnimationFrame(raf); api.current = null; pad.removeEventListener("pointerdown", onDown); pad.removeEventListener("pointermove", onMove); pad.removeEventListener("pointerup", onUp); pad.removeEventListener("pointercancel", onUp); host?.removeEventListener("pointermove", onLight); ro.disconnect(); io.disconnect(); document.removeEventListener("visibilitychange", onVis); }; }, []); const gap = reading - target; const verdict = gap === 0 ? "On target" : `${Math.abs(gap)} ${gap > 0 ? "ahead" : "behind"}`; const moveTarget = (next: number) => { const v = clamp(next, MIN, MAX); live.current.target = v; live.current.touched = performance.now(); setTarget(v); setSaid(`Target ${v}. Reading ${reading}, ${v === reading ? "on target" : `${Math.abs(reading - v)} ${reading > v ? "ahead" : "behind"}`}.`); api.current?.poke(); }; const tap = () => { const next = (idx + 1) % readings.length; live.current.touched = performance.now(); live.current.reading = readings[next]; setIdx(next); setSaid(`Reading ${readings[next]} ${dial.noun}.`); api.current?.poke(true); }; const onKey = (e: ReactKeyboardEvent) => { const next = e.key === "ArrowRight" || e.key === "ArrowUp" ? target + STEP : e.key === "ArrowLeft" || e.key === "ArrowDown" ? target - STEP : e.key === "PageUp" ? target + STEP * 5 : e.key === "PageDown" ? target - STEP * 5 : e.key === "Home" ? MIN : e.key === "End" ? MAX : null; if (next === null) return; e.preventDefault(); moveTarget(next); }; const pct = (v: number, of: number) => `${(v / of) * 100}%`; return (

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