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index.html
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index.html
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<head>
<style> body { margin: 0; } </style>
<script src="//unpkg.com/react/umd/react.production.min.js"></script>
<script src="//unpkg.com/react-dom/umd/react-dom.production.min.js"></script>
<script src="//unpkg.com/@babel/standalone"></script>
<script src="//unpkg.com/react-force-graph-2d"></script>
<!--<script src="../../src/packages/react-force-graph-2d/dist/react-force-graph-2d.js"></script>-->
<script src="../datasets/random-data.js"></script>
</head>
<body>
<div id="graph"></div>
<script type="text/jsx">
const { useMemo, useState, useCallback } = React;
const NODE_R = 8;
const HighlightGraph = () => {
const data = useMemo(() => {
const gData = genRandomTree(80);
// cross-link node objects
gData.links.forEach(link => {
const a = gData.nodes[link.source];
const b = gData.nodes[link.target];
!a.neighbors && (a.neighbors = []);
!b.neighbors && (b.neighbors = []);
a.neighbors.push(b);
b.neighbors.push(a);
!a.links && (a.links = []);
!b.links && (b.links = []);
a.links.push(link);
b.links.push(link);
});
return gData;
}, []);
const [highlightNodes, setHighlightNodes] = useState(new Set());
const [highlightLinks, setHighlightLinks] = useState(new Set());
const [hoverNode, setHoverNode] = useState(null);
const updateHighlight = () => {
setHighlightNodes(highlightNodes);
setHighlightLinks(highlightLinks);
};
const handleNodeHover = node => {
highlightNodes.clear();
highlightLinks.clear();
if (node) {
highlightNodes.add(node);
node.neighbors.forEach(neighbor => highlightNodes.add(neighbor));
node.links.forEach(link => highlightLinks.add(link));
}
setHoverNode(node || null);
updateHighlight();
};
const handleLinkHover = link => {
highlightNodes.clear();
highlightLinks.clear();
if (link) {
highlightLinks.add(link);
highlightNodes.add(link.source);
highlightNodes.add(link.target);
}
updateHighlight();
};
const paintRing = useCallback((node, ctx) => {
// add ring just for highlighted nodes
ctx.beginPath();
ctx.arc(node.x, node.y, NODE_R * 1.4, 0, 2 * Math.PI, false);
ctx.fillStyle = node === hoverNode ? 'red' : 'orange';
ctx.fill();
}, [hoverNode]);
return <ForceGraph2D
graphData={data}
nodeRelSize={NODE_R}
autoPauseRedraw={false}
linkWidth={link => highlightLinks.has(link) ? 5 : 1}
linkDirectionalParticles={4}
linkDirectionalParticleWidth={link => highlightLinks.has(link) ? 4 : 0}
nodeCanvasObjectMode={node => highlightNodes.has(node) ? 'before' : undefined}
nodeCanvasObject={paintRing}
onNodeHover={handleNodeHover}
onLinkHover={handleLinkHover}
/>;
};
ReactDOM.render(
<HighlightGraph />,
document.getElementById('graph')
);
</script>
</body>