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* Interactive force-directed graph for approved free labels. This is the
* renamed projection of the former reusable ConceptGraph: only the public
* data source changed, while canvas rendering, pan/zoom, hover, and node
* navigation remain part of the explorer experience.
*/
import { useEffect, useRef } from "react";
export type FreeLabelGraphNode = {
id: string;
name: string;
docs: number;
group: number;
};
export type FreeLabelGraphLink = {
source: string;
target: string;
weight: number;
};
export type FreeLabelGraphProps = {
nodes: readonly FreeLabelGraphNode[];
links: readonly FreeLabelGraphLink[];
onNavigate: (name: string) => void;
};
type SimNode = FreeLabelGraphNode & {
x: number;
y: number;
vx: number;
vy: number;
radius: number;
};
type SimLink = { source: SimNode; target: SimNode; weight: number };
const COLORS = ["#4e79a7", "#f28e2b", "#59a14f", "#e15759", "#b07aa1", "#76b7b2"];
function color(group: number): string {
return group < 0 ? "#8a8f98" : (COLORS[group % COLORS.length] ?? "#8a8f98");
}
function hash(value: string): number {
let result = 2166136261;
for (const character of value) result = Math.imul(result ^ character.charCodeAt(0), 16777619);
return (result >>> 0) / 0xffffffff;
}
function requireValue<T>(value: T | null | undefined): T {
if (value === null || value === undefined) throw new Error("graph element unavailable");
return value;
}
function buildNodes(nodes: readonly FreeLabelGraphNode[]): SimNode[] {
return nodes.map((node) => {
const angle = hash(node.id) * Math.PI * 2;
const distance = 100 + hash(`${node.id}:distance`) * 220;
return {
...node,
x: Math.cos(angle) * distance,
y: Math.sin(angle) * distance,
vx: 0,
vy: 0,
radius: 5 + Math.sqrt(Math.max(node.docs, 1)) * 2,
};
});
}
function buildLinks(nodes: readonly SimNode[], links: readonly FreeLabelGraphLink[]): SimLink[] {
const byId = new Map(nodes.map((node) => [node.id, node]));
return links.flatMap((link) => {
const source = byId.get(link.source);
const target = byId.get(link.target);
return source === undefined || target === undefined
? []
: [{ source, target, weight: link.weight }];
});
}
function applyLinks(links: readonly SimLink[]): void {
for (const link of links) {
const dx = link.target.x - link.source.x;
const dy = link.target.y - link.source.y;
const distance = Math.hypot(dx, dy) || 1;
const pull = ((distance - 86) / distance) * 0.025 * Math.min(link.weight, 4);
link.source.vx += dx * pull;
link.source.vy += dy * pull;
link.target.vx -= dx * pull;
link.target.vy -= dy * pull;
}
}
function applyRepulsion(nodes: readonly SimNode[]): void {
for (let first = 0; first < nodes.length; first += 1) {
for (let second = first + 1; second < nodes.length; second += 1) {
const a = nodes[first];
const b = nodes[second];
if (a === undefined || b === undefined) continue;
const dx = b.x - a.x;
const dy = b.y - a.y;
const squaredDistance = dx * dx + dy * dy || 1;
if (squaredDistance > 160_000) continue;
const force = Math.min(9000 / squaredDistance, 2);
const distance = Math.sqrt(squaredDistance);
a.vx -= (dx / distance) * force;
a.vy -= (dy / distance) * force;
b.vx += (dx / distance) * force;
b.vy += (dy / distance) * force;
}
}
}
function step(nodes: readonly SimNode[], links: readonly SimLink[], temperature: number): void {
applyLinks(links);
applyRepulsion(nodes);
for (const node of nodes) {
node.vx = (node.vx - node.x * 0.001) * 0.82;
node.vy = (node.vy - node.y * 0.001) * 0.82;
node.x += node.vx * temperature;
node.y += node.vy * temperature;
}
}
type View = { scale: number; x: number; y: number };
function fit(nodes: readonly SimNode[], width: number, height: number): View {
if (nodes.length === 0) return { scale: 1, x: width / 2, y: height / 2 };
const xs = nodes.map((node) => node.x);
const ys = nodes.map((node) => node.y);
const minX = Math.min(...xs);
const maxX = Math.max(...xs);
const minY = Math.min(...ys);
const maxY = Math.max(...ys);
const scale = Math.min(
(width - 72) / Math.max(maxX - minX, 1),
(height - 72) / Math.max(maxY - minY, 1),
1.5,
);
return {
scale,
x: width / 2 - ((minX + maxX) / 2) * scale,
y: height / 2 - ((minY + maxY) / 2) * scale,
};
}
function hitNode(nodes: readonly SimNode[], view: View, x: number, y: number): SimNode | undefined {
const graphX = (x - view.x) / view.scale;
const graphY = (y - view.y) / view.scale;
return nodes.find(
(node) => Math.hypot(node.x - graphX, node.y - graphY) <= node.radius + 4 / view.scale,
);
}
/** Canvas force graph of approved free-label co-occurrence; click a node to open it. */
export function FreeLabelGraph({
nodes: sourceNodes,
links: sourceLinks,
onNavigate,
}: FreeLabelGraphProps): React.JSX.Element {
const canvasRef = useRef<HTMLCanvasElement | null>(null);
useEffect(() => {
const canvas = canvasRef.current;
const context = canvas?.getContext("2d");
const container = canvas?.parentElement;
if (canvas === null || context === null || container === null) return undefined;
const graphContext = requireValue(context);
const graphContainer = requireValue(container);
const nodes = buildNodes(sourceNodes);
const links = buildLinks(nodes, sourceLinks);
let width = 0;
let height = 0;
let view: View = { scale: 1, x: 0, y: 0 };
let hovered: SimNode | undefined;
let dragging = false;
let moved = false;
let last = { x: 0, y: 0 };
let frame = 0;
let temperature = 0.95;
const dpr = window.devicePixelRatio || 1;
const draw = (): void => {
graphContext.setTransform(dpr, 0, 0, dpr, 0, 0);
graphContext.clearRect(0, 0, width, height);
graphContext.translate(view.x, view.y);
graphContext.scale(view.scale, view.scale);
for (const link of links) {
graphContext.beginPath();
graphContext.moveTo(link.source.x, link.source.y);
graphContext.lineTo(link.target.x, link.target.y);
graphContext.strokeStyle = "#8a8f9880";
graphContext.lineWidth = Math.min(link.weight, 3) / view.scale;
graphContext.stroke();
}
for (const node of nodes) {
graphContext.beginPath();
graphContext.arc(node.x, node.y, node.radius, 0, Math.PI * 2);
graphContext.fillStyle = color(node.group);
graphContext.fill();
if (node === hovered) {
graphContext.strokeStyle = "#1f2937";
graphContext.lineWidth = 2 / view.scale;
graphContext.stroke();
}
}
graphContext.fillStyle = "#374151";
graphContext.font = `${String(Math.max(10 / view.scale, 8))}px system-ui, sans-serif`;
graphContext.textAlign = "center";
for (const node of nodes) {
if (node.docs >= 3 || node === hovered || view.scale > 1.8) {
graphContext.fillText(node.name, node.x, node.y - node.radius - 5 / view.scale);
}
}
};
const resize = (): void => {
width = Math.max(graphContainer.clientWidth, 320);
height = Math.min(Math.max(width * 0.72, 380), 620);
canvas.width = width * dpr;
canvas.height = height * dpr;
canvas.style.height = `${String(height)}px`;
view = fit(nodes, width, height);
draw();
};
const position = (event: PointerEvent | WheelEvent): { x: number; y: number } => {
const rect = canvas.getBoundingClientRect();
return { x: event.clientX - rect.left, y: event.clientY - rect.top };
};
const animate = (): void => {
if (temperature > 0.015) {
step(nodes, links, temperature);
temperature *= 0.985;
draw();
frame = requestAnimationFrame(animate);
}
};
const down = (event: PointerEvent): void => {
dragging = true;
moved = false;
last = position(event);
canvas.setPointerCapture(event.pointerId);
};
const move = (event: PointerEvent): void => {
const next = position(event);
if (dragging) {
moved ||= Math.abs(next.x - last.x) + Math.abs(next.y - last.y) > 2;
view = { ...view, x: view.x + next.x - last.x, y: view.y + next.y - last.y };
last = next;
draw();
return;
}
hovered = hitNode(nodes, view, next.x, next.y);
canvas.style.cursor = hovered === undefined ? "grab" : "pointer";
draw();
};
const up = (event: PointerEvent): void => {
dragging = false;
if (!moved) {
const node = hitNode(nodes, view, position(event).x, position(event).y);
if (node !== undefined) onNavigate(node.id);
}
};
const wheel = (event: WheelEvent): void => {
event.preventDefault();
const point = position(event);
const scale = Math.min(Math.max(view.scale * Math.exp(-event.deltaY * 0.0015), 0.2), 5);
view = {
scale,
x: point.x - ((point.x - view.x) / view.scale) * scale,
y: point.y - ((point.y - view.y) / view.scale) * scale,
};
draw();
};
canvas.style.cursor = "grab";
resize();
for (let iteration = 0; iteration < 30; iteration += 1) step(nodes, links, 0.85);
view = fit(nodes, width, height);
draw();
frame = requestAnimationFrame(animate);
canvas.addEventListener("pointerdown", down);
canvas.addEventListener("pointermove", move);
canvas.addEventListener("pointerup", up);
canvas.addEventListener("wheel", wheel, { passive: false });
window.addEventListener("resize", resize);
return (): void => {
cancelAnimationFrame(frame);
canvas.removeEventListener("pointerdown", down);
canvas.removeEventListener("pointermove", move);
canvas.removeEventListener("pointerup", up);
canvas.removeEventListener("wheel", wheel);
window.removeEventListener("resize", resize);
};
}, [sourceNodes, sourceLinks, onNavigate]);
return (
<div className="x-graph-frame w-full">
<canvas
ref={canvasRef}
aria-label="Force-directed graph of approved free labels"
className="block w-full touch-none"
/>
</div>
);
}
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