react-force-graph/example/text-nodes/index-2d.html at master · vasturiano/react-force-graph · GitHub

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<head>
  <style> body { margin: 0; } </style>

  <script type="importmap">{ "imports": {
    "react": "https://esm.sh/react",
    "react-dom": "https://esm.sh/react-dom/client"
  }}</script>

<!--  <script type="module">import * as React from 'react'; window.React = React;</script>-->
<!--  <script src="../../src/packages/react-force-graph-2d/dist/react-force-graph-2d.js" defer></script>-->
</head>

<body>
  <div id="graph"></div>

  <script src="//cdn.jsdelivr.net/npm/@babel/standalone"></script>
  <script type="text/jsx" data-type="module">
    import ForceGraph2D from 'https://esm.sh/react-force-graph-2d?external=react';
    import React from 'react';
    import { createRoot } from 'react-dom';

    fetch('../datasets/miserables.json').then(res => res.json()).then(data => {
      createRoot(document.getElementById('graph')).render(
        <ForceGraph2D
          graphData={data}
          nodeAutoColorBy="group"
          nodeCanvasObject={(node, ctx, globalScale) => {
            const label = node.id;
            const fontSize = 12/globalScale;
            ctx.font = `${fontSize}px Sans-Serif`;
            const textWidth = ctx.measureText(label).width;
            const bckgDimensions = [textWidth, fontSize].map(n => n + fontSize * 0.2); // some padding

            ctx.fillStyle = 'rgba(255, 255, 255, 0.8)';
            ctx.fillRect(node.x - bckgDimensions[0] / 2, node.y - bckgDimensions[1] / 2, ...bckgDimensions);

            ctx.textAlign = 'center';
            ctx.textBaseline = 'middle';
            ctx.fillStyle = node.color;
            ctx.fillText(label, node.x, node.y);

            node.__bckgDimensions = bckgDimensions; // to re-use in nodePointerAreaPaint
          }}
          nodePointerAreaPaint={(node, color, ctx) => {
            ctx.fillStyle = color;
            const bckgDimensions = node.__bckgDimensions;
            bckgDimensions && ctx.fillRect(node.x - bckgDimensions[0] / 2, node.y - bckgDimensions[1] / 2, ...bckgDimensions);
          }}
        />
      );
    });
  </script>
</body>