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Created August 28, 2025 16:22
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gistfile1.txt
import React, { useEffect, useLayoutEffect, useMemo, useRef, useState } from "react";
import { Eye, EyeOff } from "lucide-react";
import { motion } from "framer-motion";
/**
* Demo: Two PointCards connected by a band.
* - Drag the bottom card OR use the angle slider to move it along an arc.
* - Modes:
* 1) Designer (manual attenuation)
* 2) Min-surface (catenary-like profile from surface-tension vs axial tension)
* 3) Viscous thinning (slender-jet inspired, viscosity + surface-tension + time)
* - Anchors at the **geometric center** of each card's inner bubble.
* - Marching dots toward the midpoint with two mapping modes.
* - Respects prefers-reduced-motion: dots stop and density increases instead of speed.
*/
export default function Demo() {
const topRef = useRef<HTMLDivElement | null>(null);
const bottomRef = useRef<HTMLDivElement | null>(null);
const containerRef = useRef<HTMLDivElement | null>(null);
// Centers (in container coordinates)
const [topCenter] = useState<{ x: number; y: number }>({ x: 520, y: 150 });
const [bottomCenter, setBottomCenter] = useState<{ x: number; y: number }>({ x: 560, y: 420 });
const [epoch, setEpoch] = useState(0); // bump when bottom moves so connector recomputes
// Angle control (for arc test)
const [angleDeg, setAngleDeg] = useState(45);
const radius = useMemo(
() => Math.hypot(bottomCenter.x - topCenter.x, bottomCenter.y - topCenter.y),
[bottomCenter, topCenter]
);
// --- Mode & controls ---
type Mode = "designer" | "min" | "viscous";
const [mode, setMode] = useState<Mode>("viscous");
// Shared visual controls
const [widthPx, setWidthPx] = useState(14); // used when NOT conserving volume
const [conserveVol, setConserveVol] = useState(true); // area conservation toggle
const [areaPx, setAreaPx] = useState(2600); // target area when conserving
// Designer attenuation controls
const [attenDepth, setAttenDepth] = useState(0.7); // 0..1 -> how thin at midpoint
const [attenStart, setAttenStart] = useState(0.4); // 0.05..3.0 -> where attenuation starts (spread)
const [attenSteep, setAttenSteep] = useState(1.0); // 0.25..8 -> steepness of the attenuation curve
// Min-surface parameters (catenary-like)
const [sigmaMin, setSigmaMin] = useState(1.0); // surface tension (arb. units)
const [tension, setTension] = useState(4.0); // axial tension (arb. units)
// Viscous thinning parameters (slender-jet inspired)
const [sigma, setSigma] = useState(1.0); // surface tension
const [eta, setEta] = useState(5.0); // viscosity
const [timeSec, setTimeSec] = useState(1.0); // time dial
// --- Marching dots params ---
const [topScore, setTopScore] = useState(60);
const [bottomScore, setBottomScore] = useState(40);
const [relevance, setRelevance] = useState(70);
type FlowMode = "A_widthByRelevance" | "B_widthByScore";
const [flowMode, setFlowMode] = useState<FlowMode>("B_widthByScore");
const moveByAngle = (deg: number) => {
if (!containerRef.current) return;
const rad = (deg * Math.PI) / 180;
const x = topCenter.x + radius * Math.cos(rad);
const y = topCenter.y + radius * Math.sin(rad);
setBottomCenter({ x, y });
setEpoch((e) => e + 1);
};
// Drag handling for bottom card (center-anchored)
const dragState = useRef<{ active: boolean; dx: number; dy: number } | null>(null);
const onPointerDown = (e: React.PointerEvent) => {
if (!containerRef.current) return;
const rect = containerRef.current.getBoundingClientRect();
const cx = e.clientX - rect.left;
const cy = e.clientY - rect.top;
dragState.current = { active: true, dx: bottomCenter.x - cx, dy: bottomCenter.y - cy };
(e.target as Element).setPointerCapture?.(e.pointerId);
};
const onPointerMove = (e: React.PointerEvent) => {
if (!containerRef.current) return;
if (!dragState.current?.active) return;
const rect = containerRef.current.getBoundingClientRect();
const cx = e.clientX - rect.left;
const cy = e.clientY - rect.top;
setBottomCenter({ x: cx + dragState.current.dx, y: cy + dragState.current.dy });
setEpoch((v) => v + 1);
};
const endDrag = () => {
if (dragState.current) dragState.current.active = false;
};
// --- Smoke tests ("test cases") ---
useEffect(() => {
console.groupCollapsed("Elastic band smoke tests");
console.assert(!!containerRef.current, "Container ref should be set");
console.assert(!!topRef.current && !!bottomRef.current, "PointCard refs should be set");
const svg = document.querySelector("svg[preserveAspectRatio='none']");
console.assert(!!svg, "Connector SVG should exist");
// Verify we hit the geometric centers (±2px)
const svgEl = document.querySelector('svg[data-start][data-end]') as SVGSVGElement | null;
if (svgEl && containerRef.current && topRef.current && bottomRef.current) {
const [sx, sy] = (svgEl.getAttribute('data-start') || '0,0').split(',').map(Number);
const [ex, ey] = (svgEl.getAttribute('data-end') || '0,0').split(',').map(Number);
const c = containerRef.current.getBoundingClientRect();
const getCenter = (root: HTMLElement) => {
const box = (root.querySelector('[data-anchor-box]') as HTMLElement | null)?.getBoundingClientRect() || root.getBoundingClientRect();
return { x: box.left - c.left + box.width / 2, y: box.top - c.top + box.height / 2 };
};
const a = getCenter(topRef.current!);
const b = getCenter(bottomRef.current!);
const near = (x: number, y: number, X: number, Y: number) => Math.hypot(x - X, y - Y) <= 2.1;
console.assert(near(sx, sy, a.x, a.y), 'Start must hit geometric center');
console.assert(near(ex, ey, b.x, b.y), 'End must hit geometric center');
}
const hasPath = !!document.querySelector('path[d]');
console.assert(hasPath, 'Connector path(s) should be present');
console.groupEnd();
}, [epoch, widthPx, conserveVol, areaPx, attenDepth, attenStart, attenSteep, sigmaMin, tension, sigma, eta, timeSec, mode, topScore, bottomScore, relevance, flowMode]);
return (
<div className="min-h-screen w-full bg-white [background-image:radial-gradient(black_1px,transparent_1px)] [background-size:24px_24px] flex items-center justify-center p-10">
<div ref={containerRef} className="relative w-full max-w-5xl h-[700px] rounded-xl">
{/* Controls */}
<div className="absolute right-2 top-2 z-20 rounded-lg border border-slate-200 bg-white/90 p-3 shadow-sm backdrop-blur space-y-3">
<div className="text-sm font-medium text-slate-700">Experiment</div>
<label className="flex items-center gap-3 text-sm text-slate-600">
<span className="min-w-28">Mode</span>
<select className="border rounded px-2 py-1" value={mode} onChange={(e) => setMode(e.target.value as Mode)}>
<option value="designer">Designer</option>
<option value="min">Min surface</option>
<option value="viscous">Viscous thinning</option>
</select>
</label>
{/* Marching dots mapping */}
<label className="flex items-center gap-3 text-sm text-slate-600">
<span className="min-w-28">Flow mapping</span>
<select className="border rounded px-2 py-1" value={flowMode} onChange={(e) => setFlowMode(e.target.value as FlowMode)}>
<option value="A_widthByRelevance">A: width ⇐ relevance; speed ⇐ score</option>
<option value="B_widthByScore">B: width ⇐ score; speed ⇐ relevance</option>
</select>
</label>
<label className="flex items-center gap-3 text-sm text-slate-600">
<span className="min-w-28">Top score</span>
<input type="range" min={0} max={100} value={topScore} onChange={(e) => setTopScore(Number(e.target.value))} />
<span className="tabular-nums w-10 text-right">{topScore}</span>
</label>
<label className="flex items-center gap-3 text-sm text-slate-600">
<span className="min-w-28">Bottom score</span>
<input type="range" min={0} max={100} value={bottomScore} onChange={(e) => setBottomScore(Number(e.target.value))} />
<span className="tabular-nums w-10 text-right">{bottomScore}</span>
</label>
<label className="flex items-center gap-3 text-sm text-slate-600">
<span className="min-w-28">Relevance</span>
<input type="range" min={0} max={100} value={relevance} onChange={(e) => setRelevance(Number(e.target.value))} />
<span className="tabular-nums w-10 text-right">{relevance}</span>
</label>
<label className="flex items-center gap-3 text-sm text-slate-600">
<span className="min-w-28">Angle</span>
<input type="range" min={0} max={360} value={angleDeg} onChange={(e) => { const v = Number(e.target.value); setAngleDeg(v); moveByAngle(v); }} />
<span className="tabular-nums w-12 text-right">{angleDeg}°</span>
</label>
{mode !== 'viscous' && (
<label className="flex items-center gap-3 text-sm text-slate-600">
<span className="min-w-28">Width (px)</span>
<input type="range" min={2} max={40} value={widthPx} onChange={(e) => setWidthPx(Number(e.target.value))} />
<span className="tabular-nums w-12 text-right">{widthPx}</span>
</label>
)}
{/* Designer controls */}
{mode === 'designer' && (
<div className="space-y-2">
<label className="flex items-center gap-3 text-sm text-slate-600">
<span className="min-w-28">Atten depth</span>
<input type="range" min={0} max={1} step={0.01} value={attenDepth} onChange={(e) => setAttenDepth(Number(e.target.value))} />
<span className="tabular-nums w-12 text-right">{attenDepth.toFixed(2)}</span>
</label>
<label className="flex items-center gap-3 text-sm text-slate-600">
<span className="min-w-28">Atten start</span>
<input type="range" min={0.05} max={3.0} step={0.01} value={attenStart} onChange={(e) => setAttenStart(Number(e.target.value))} />
<span className="tabular-nums w-12 text-right">{attenStart.toFixed(2)}</span>
</label>
<label className="flex items-center gap-3 text-sm text-slate-600">
<span className="min-w-28">Atten steepness</span>
<input type="range" min={0.25} max={8} step={0.05} value={attenSteep} onChange={(e) => setAttenSteep(Number(e.target.value))} />
<span className="tabular-nums w-12 text-right">{attenSteep.toFixed(2)}</span>
</label>
</div>
)}
{/* Min-surface controls */}
{mode === 'min' && (
<div className="space-y-2">
<label className="flex items-center gap-3 text-sm text-slate-600">
<span className="min-w-28">Surface tension σ</span>
<input type="range" min={0.2} max={5} step={0.1} value={sigmaMin} onChange={(e) => setSigmaMin(Number(e.target.value))} />
<span className="tabular-nums w-12 text-right">{sigmaMin.toFixed(1)}</span>
</label>
<label className="flex items-center gap-3 text-sm text-slate-600">
<span className="min-w-28">Axial tension T</span>
<input type="range" min={0.2} max={10} step={0.1} value={tension} onChange={(e) => setTension(Number(e.target.value))} />
<span className="tabular-nums w-12 text-right">{tension.toFixed(1)}</span>
</label>
</div>
)}
{/* Viscous thinning controls */}
{mode === 'viscous' && (
<div className="space-y-2">
<label className="flex items-center gap-3 text-sm text-slate-600">
<span className="min-w-28">Surface tension σ</span>
<input type="range" min={0.2} max={5} step={0.1} value={sigma} onChange={(e) => setSigma(Number(e.target.value))} />
<span className="tabular-nums w-12 text-right">{sigma.toFixed(1)}</span>
</label>
<label className="flex items-center gap-3 text-sm text-slate-600">
<span className="min-w-28">Viscosity η</span>
<input type="range" min={0.2} max={20} step={0.1} value={eta} onChange={(e) => setEta(Number(e.target.value))} />
<span className="tabular-nums w-12 text-right">{eta.toFixed(1)}</span>
</label>
<label className="flex items-center gap-3 text-sm text-slate-600">
<span className="min-w-28">Time</span>
<input type="range" min={0} max={5} step={0.05} value={timeSec} onChange={(e) => setTimeSec(Number(e.target.value))} />
<span className="tabular-nums w-12 text-right">{timeSec.toFixed(2)}s</span>
</label>
</div>
)}
<label className="flex items-center gap-3 text-sm text-slate-600">
<input type="checkbox" checked={conserveVol} onChange={(e) => setConserveVol(e.target.checked)} />
<span>Conserve volume (area)</span>
</label>
{conserveVol && (
<label className="flex items-center gap-3 text-sm text-slate-600">
<span className="min-w-28">Area (px²)</span>
<input type="range" min={200} max={16000} step={10} value={areaPx} onChange={(e) => setAreaPx(Number(e.target.value))} />
<span className="tabular-nums w-16 text-right">{areaPx}</span>
</label>
)}
<div className="mt-1 text-xs text-slate-500">Drag the bottom card too. Honors your OS “reduced motion” setting.</div>
</div>
{/* Cards (absolute, center-anchored) */}
<PointCard
refEl={topRef}
text="Here I have made a new point"
className="absolute -translate-x-1/2 -translate-y-1/2"
style={{ left: topCenter.x, top: topCenter.y }}
/>
<PointCard
refEl={bottomRef}
text="This is a counterpoint that challenges the claim"
variant="counterpoint"
className="absolute -translate-x-1/2 -translate-y-1/2 cursor-grab active:cursor-grabbing select-none"
style={{ left: bottomCenter.x, top: bottomCenter.y }}
onPointerDown={onPointerDown}
onPointerMove={onPointerMove}
onPointerUp={endDrag}
onPointerCancel={endDrag}
/>
{/* Connector overlay */}
<ElasticConnector
containerRef={containerRef}
fromRef={topRef}
toRef={bottomRef}
epoch={epoch}
widthPx={widthPx}
conserveVol={conserveVol}
areaPx={areaPx}
// Designer
attenDepth={attenDepth}
attenStart={attenStart}
attenSteep={attenSteep}
// Min-surface
sigmaMin={sigmaMin}
tension={tension}
// Viscous
sigma={sigma}
eta={eta}
timeSec={timeSec}
mode={mode}
// Dots
topScore={topScore}
bottomScore={bottomScore}
relevance={relevance}
flowMode={flowMode}
/>
</div>
</div>
);
}
/** Connector draws a variable-width band along a STRAIGHT centerline, anchored at geometric centers */
function ElasticConnector({
containerRef,
fromRef,
toRef,
epoch,
widthPx,
conserveVol,
areaPx,
// Designer
attenDepth,
attenStart,
attenSteep,
// Min-surface
sigmaMin,
tension,
// Viscous
sigma,
eta,
timeSec,
mode,
// Dots
topScore,
bottomScore,
relevance,
flowMode,
}: {
containerRef: React.MutableRefObject<HTMLDivElement | null>;
fromRef: React.MutableRefObject<HTMLDivElement | null>;
toRef: React.MutableRefObject<HTMLDivElement | null>;
epoch?: number;
widthPx: number; // used when not conserving volume
conserveVol: boolean;
areaPx: number;
// Designer
attenDepth: number;
attenStart: number;
attenSteep: number;
// Min-surface
sigmaMin: number; // surface tension (arb.)
tension: number; // axial tension (arb.)
// Viscous
sigma: number;
eta: number;
timeSec: number;
mode: "designer" | "min" | "viscous";
// Dots
topScore: number;
bottomScore: number;
relevance: number;
flowMode: "A_widthByRelevance" | "B_widthByScore";
}) {
const [box, setBox] = useState<{ width: number; height: number } | null>(null);
const [shapePath, setShapePath] = useState<string | null>(null);
const [dbg, setDbg] = useState<{ sx: number; sy: number; ex: number; ey: number } | null>(null);
const [meta, setMeta] = useState<null | { sx:number; sy:number; ex:number; ey:number; L:number; ux:number; uy:number; w:number[]; N:number }>(null);
const [tick, setTick] = useState(0);
// Reduced motion detection
const [reduced, setReduced] = useState(false);
useEffect(() => {
const mq = window.matchMedia('(prefers-reduced-motion: reduce)');
const update = () => setReduced(mq.matches);
update();
mq.addEventListener('change', update);
return () => mq.removeEventListener('change', update);
}, []);
// Animation clock for marching dots; pause when reduced
useEffect(() => {
if (reduced) return; // no loop for reduced motion
let raf = 0;
const loop = () => { setTick((t) => (t + 1) % 1_000_000); raf = requestAnimationFrame(loop); };
raf = requestAnimationFrame(loop);
return () => cancelAnimationFrame(raf);
}, [reduced]);
// Shared constants
const NECK_PX = 24; // distance from each anchor over which we ramp from 0 to full width (in px)
const MIN_CORE_PX = 2.0; // hard floor for the strap away from the anchors
const MAX_W = 28; // safety clamp to avoid spikes when nodes are close
const compute = () => {
if (!containerRef.current || !fromRef.current || !toRef.current) return;
const aRoot = fromRef.current as HTMLElement;
const bRoot = toRef.current as HTMLElement;
const c = containerRef.current.getBoundingClientRect();
const aBoxEl = aRoot.querySelector('[data-anchor-box]') as HTMLElement | null;
const bBoxEl = bRoot.querySelector('[data-anchor-box]') as HTMLElement | null;
const aBox = aBoxEl?.getBoundingClientRect() || aRoot.getBoundingClientRect();
const bBox = bBoxEl?.getBoundingClientRect() || bRoot.getBoundingClientRect();
// geometric centers of bubbles
let sx = aBox.left + aBox.width / 2;
let sy = aBox.top + aBox.height / 2;
let ex = bBox.left + bBox.width / 2;
let ey = bBox.top + bBox.height / 2;
// Convert to container coords
sx -= c.left; sy -= c.top; ex -= c.left; ey -= c.top;
// Straight centerline between anchors
const dx = ex - sx, dy = ey - sy;
const L = Math.hypot(dx, dy) || 1;
const ux = dx / L, uy = dy / L; // unit direction
const nx = -dy / L, ny = dx / L; // unit normal
if (L < 4) {
setBox({ width: c.width, height: c.height });
setShapePath(null);
setDbg({ sx, sy, ex, ey });
setMeta(null);
return;
}
const N = 128; // high for smoother integral
const topPts: Array<[number, number]> = [];
const botPts: Array<[number, number]> = [];
// --- Build normalized shape g(t) in [0,1] depending on mode ---
const g: number[] = [];
const tStep = 1 / N;
// Smoothstep utility (single definition)
const smoothStep = (x: number) => (x <= 0 ? 0 : x >= 1 ? 1 : x * x * (3 - 2 * x));
if (mode === "designer") {
for (let i = 0; i <= N; i++) {
const t = i / N;
const r1 = smoothStep((L * t) / NECK_PX);
const r2 = smoothStep((L * (1 - t)) / NECK_PX);
const base = Math.min(1, r1) * Math.min(1, r2);
const bellBase = Math.exp(-Math.pow((t - 0.5) / attenStart, 2));
const bell = Math.pow(bellBase, attenSteep);
g.push(Math.max(0, base * (1 - attenDepth * bell)));
}
} else if (mode === "min") {
const lam = Math.max(0.05, Math.min(1.5, (sigmaMin / Math.max(0.1, tension)) * 0.4));
const C = Math.cosh(0.5 / lam);
for (let i = 0; i <= N; i++) {
const t = i / N;
const val = (C - Math.cosh((t - 0.5) / lam)) / (C - 1);
const r1 = smoothStep((L * t) / NECK_PX);
const r2 = smoothStep((L * (1 - t)) / NECK_PX);
const base = Math.min(1, r1) * Math.min(1, r2);
g.push(Math.max(0, Math.max(0, val) * base));
}
} else {
const k = (sigma / Math.max(0.2, eta)) * timeSec * 0.25; // tune factor 0.25 for UX range
const depthPhys = Math.max(0, Math.min(1, k));
for (let i = 0; i <= N; i++) {
const t = i / N;
const r1 = smoothStep((L * t) / NECK_PX);
const r2 = smoothStep((L * (1 - t)) / NECK_PX);
const base = Math.min(1, r1) * Math.min(1, r2);
const bellBase = Math.exp(-Math.pow((t - 0.5) / Math.max(0.1, attenStart), 2));
const bell = Math.pow(bellBase, Math.max(0.25, attenSteep));
g.push(Math.max(0, base * (1 - depthPhys * bell)));
}
}
// Integral of g(t) dt over [0,1]
let gInt = 0;
for (let i = 1; i <= N; i++) gInt += 0.5 * (g[i - 1] + g[i]) * tStep; // trapezoid
// Determine width scale
let scale = conserveVol ? areaPx / (L * Math.max(1e-6, gInt)) : widthPx;
if (conserveVol) scale = Math.min(scale, MAX_W);
// Apply mapping for width
const mapScore = (s: number) => 0.5 + s / 100; // 0..100 ⇒ 0.5..1.5
const relScale = mapScore(relevance);
const topScale = mapScore(topScore);
const botScale = mapScore(bottomScore);
const wArr: number[] = [];
const edgeSigma = 0.08; // for bulbs
const bump: number[] = [];
let bumpMax = 0;
for (let i = 0; i <= N; i++) {
const t = i / N;
const b = Math.exp(-Math.pow(t / edgeSigma, 2)) + Math.exp(-Math.pow((1 - t) / edgeSigma, 2));
bump.push(b);
if (b > bumpMax) bumpMax = b;
}
for (let i = 0; i <= N; i++) bump[i] = bump[i] / (bumpMax || 1);
const coreMask: number[] = [];
for (let i = 0; i <= N; i++) {
const t = i / N;
const r1 = smoothStep((L * t) / NECK_PX);
const r2 = smoothStep((L * (1 - t)) / NECK_PX);
coreMask.push(Math.min(1, r1) * Math.min(1, r2));
}
const midIndex = Math.floor(N / 2);
const wMidPred = scale * g[midIndex];
const bulbGain = Math.max(0, MIN_CORE_PX - wMidPred) * 1.25;
for (let i = 0; i <= N; i++) {
const t = i / N;
const cx = sx + dx * t;
const cy = sy + dy * t;
// base width
let w = Math.max(0, scale * g[i]);
// mapping
if (flowMode === "A_widthByRelevance") {
w *= relScale; // global widen by relevance
} else {
const kSide = topScale * (1 - t) + botScale * t; // lerp per side scores
w *= kSide;
}
// floors + bulbs
w = Math.max(w, MIN_CORE_PX * coreMask[i]);
w += bulbGain * bump[i];
wArr.push(w);
const half = w / 2;
topPts.push([cx + nx * half, cy + ny * half]);
botPts.push([cx - nx * half, cy - ny * half]);
}
// Build path
let d = `M ${topPts[0][0]},${topPts[0][1]}`;
for (let i = 1; i <= N; i++) d += ` L ${topPts[i][0]},${topPts[i][1]}`;
for (let i = N; i >= 0; i--) d += ` L ${botPts[i][0]},${botPts[i][1]}`;
d += " Z";
setBox({ width: c.width, height: c.height });
setShapePath(d);
setDbg({ sx, sy, ex, ey });
setMeta({ sx, sy, ex, ey, L, ux, uy, w: wArr, N });
};
useLayoutEffect(() => {
const update = () => compute();
update();
const ro = new ResizeObserver(update);
if (containerRef.current) ro.observe(containerRef.current);
if (fromRef.current) ro.observe(fromRef.current);
if (toRef.current) ro.observe(toRef.current);
window.addEventListener("resize", update);
window.addEventListener("scroll", update, { passive: true });
return () => {
ro.disconnect();
window.removeEventListener("resize", update);
window.removeEventListener("scroll", update);
};
}, [containerRef, fromRef, toRef]);
// Recompute when position/params change
useLayoutEffect(() => {
compute();
}, [epoch, widthPx, conserveVol, areaPx, attenDepth, attenStart, attenSteep, sigmaMin, tension, sigma, eta, timeSec, mode, topScore, bottomScore, relevance, flowMode]);
if (!box || !shapePath || !meta) return null;
// --- Dots helpers ---
const widthAt = (u: number) => {
const { w, N } = meta;
const i = Math.max(0, Math.min(N, u * N));
const i0 = Math.floor(i);
const i1 = Math.min(N, i0 + 1);
const t = i - i0;
return w[i0] * (1 - t) + w[i1] * t;
};
const posAt = (u: number) => {
const { sx, sy, ux, uy, L } = meta;
return { x: sx + ux * L * u, y: sy + uy * L * u };
};
// Speed / density mapping
const baseSpeed = 60; // px/s when moving
const mapSpeed = (s: number) => baseSpeed * (0.5 + s / 100); // 0..100 ⇒ 0.5..1.5×
const topSpeed = reduced ? 0 : (flowMode === "A_widthByRelevance" ? mapSpeed(topScore) : mapSpeed(relevance));
const bottomSpeed = reduced ? 0 : (flowMode === "A_widthByRelevance" ? mapSpeed(bottomScore) : mapSpeed(relevance));
const spacingBase = 28; // base px between dots
const densityFactor = (v: number) => 0.5 + v / 100; // 0.5..1.5
let spacingTop = spacingBase;
let spacingBot = spacingBase;
if (reduced) {
if (flowMode === "A_widthByRelevance") {
spacingTop = spacingBase / densityFactor(topScore);
spacingBot = spacingBase / densityFactor(bottomScore);
} else {
const f = densityFactor(relevance);
spacingTop = spacingBase / f;
spacingBot = spacingBase / f;
}
}
const halfLen = meta.L * 0.5;
const now = reduced ? 0 : tick / 60; // seconds
const nTop = Math.max(3, Math.ceil(halfLen / (reduced ? spacingTop : spacingBase)));
const nBot = nTop;
const topDots = Array.from({ length: nTop }).map((_, j) => {
const dist = reduced ? (j + 0.5) * spacingTop : (now * topSpeed + j * spacingBase) % halfLen; // px from start
const u = Math.min(0.5, dist / meta.L);
const p = posAt(u);
const w = widthAt(u);
const r = Math.max(1.6, Math.min(7, w * 0.28));
return { key: `t${j}`, cx: p.x, cy: p.y, r };
});
const botDots = Array.from({ length: nBot }).map((_, j) => {
const dist = reduced ? (j + 0.5) * spacingBot : (now * bottomSpeed + j * spacingBase) % halfLen; // px from end
const u = Math.max(0.5, 1 - dist / meta.L);
const p = posAt(u);
const w = widthAt(u);
const r = Math.max(1.6, Math.min(7, w * 0.28));
return { key: `b${j}`, cx: p.x, cy: p.y, r };
});
return (
<svg
className="pointer-events-none absolute inset-0 z-0 w-full h-full"
viewBox={`0 0 ${box.width} ${box.height}`}
preserveAspectRatio="none"
data-start={`${Math.round(meta.sx)},${Math.round(meta.sy)}`}
data-end={`${Math.round(meta.ex)},${Math.round(meta.ey)}`}
data-mincore={2}
>
<defs>
<linearGradient id="strapFill" x1="0" y1="0" x2="0" y2="1">
<stop offset="0%" stopColor="#111827" />
<stop offset="100%" stopColor="#374151" />
</linearGradient>
<filter id="dotShadow" x="-50%" y="-50%" width="200%" height="200%">
<feDropShadow dx="0" dy="0" stdDeviation="0.7" floodOpacity="0.2" />
</filter>
</defs>
{/* Strap */}
<path d={shapePath!} fill="rgba(0,0,0,0.15)" />
<path d={shapePath!} fill="url(#strapFill)" />
<path d={shapePath!} fill="none" stroke="rgba(255,255,255,0.12)" strokeWidth={1} />
{/* Marching dots */}
<g filter="url(#dotShadow)">
{topDots.map((d) => (
<circle key={d.key} cx={d.cx} cy={d.cy} r={d.r} fill="#fff" stroke="#0b1220" strokeWidth={1.5} />
))}
{botDots.map((d) => (
<circle key={d.key} cx={d.cx} cy={d.cy} r={d.r} fill="#fff" stroke="#0b1220" strokeWidth={1.5} />
))}
</g>
</svg>
);
}
/** Card component */
export function PointCard({
refEl,
text,
variant = "point",
onToggleHidden,
className,
style,
onPointerDown,
onPointerMove,
onPointerUp,
onPointerCancel,
}: {
refEl?: React.MutableRefObject<HTMLDivElement | null>;
text: string;
variant?: "point" | "counterpoint";
onToggleHidden?: (hidden: boolean) => void;
className?: string;
style?: React.CSSProperties;
onPointerDown?: React.PointerEventHandler<HTMLDivElement>;
onPointerMove?: React.PointerEventHandler<HTMLDivElement>;
onPointerUp?: React.PointerEventHandler<HTMLDivElement>;
onPointerCancel?: React.PointerEventHandler<HTMLDivElement>;
}) {
const [hidden, setHidden] = useState(false);
const accent = variant === "counterpoint" ? "red" : "blue";
return (
<motion.div
initial={{ y: 2, opacity: 0 }}
animate={{ y: 0, opacity: 1 }}
whileHover={{ y: -1 }}
className={`group relative z-10 ${className ?? ""}`}
style={style}
ref={refEl as any}
onPointerDown={onPointerDown}
onPointerMove={onPointerMove}
onPointerUp={onPointerUp}
onPointerCancel={onPointerCancel}
>
<div
className={`absolute -left-2 top-3 bottom-3 w-1 rounded-full bg-gradient-to-b from-${accent}-400 to-${accent}-600 opacity-70`}
aria-hidden
/>
<div data-anchor-box className="relative inline-block w-auto max-w-[45ch] rounded-2xl border border-slate-200 bg-gradient-to-br from-white to-slate-50 p-5 pr-12 text-slate-800 shadow ring-1 ring-slate-100/60">
<p className="text-lg leading-relaxed break-words">
{hidden ? <span className="italic text-slate-400">(Hidden)</span> : text}
</p>
<button
type="button"
aria-label={hidden ? "Show point" : "Hide point"}
className="absolute right-2 top-2 opacity-0 transition-opacity group-hover:opacity-100"
onClick={() => {
setHidden((h) => {
const next = !h;
onToggleHidden?.(next);
return next;
});
}}
>
<span className="group/eye inline-flex items-center justify-center rounded-full border border-slate-200 bg-white/80 p-1.5 shadow-sm backdrop-blur transition-transform hover:scale-105">
<Eye className="h-4 w-4 text-slate-600 transition-opacity group-hover/eye:opacity-0" aria-hidden />
<EyeOff className="h-4 w-4 -ml-4 text-slate-700 opacity-0 transition-opacity group-hover/eye:opacity-100" aria-hidden />
</span>
</button>
<span
className={`pointer-events-none absolute inset-0 rounded-2xl ring-0 ring-${accent}-500/0 transition-[box-shadow,ring] group-hover:ring-4 group-hover:ring-${accent}-500/10`}
/>
</div>
{/* Center marker (for debugging/visual alignment) */}
<span data-anchor-center className="pointer-events-none absolute left-1/2 top-1/2 w-0 h-0 -translate-x-1/2 -translate-y-1/2" />
</motion.div>
);
}
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