Density over a histogram

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@toclocoinc/lattice-grid@1.27.0/lattice-grid.min.css">

<div id="app"></div>

<script type="module">
  import React from 'https://esm.sh/react@18';
  import { createRoot } from 'https://esm.sh/react-dom@18/client';
  import { createGrid } from 'https://cdn.jsdelivr.net/npm/@toclocoinc/lattice-grid@1.27.0/lattice-grid.esm.min.js';
  import createLatticeGrid from 'https://cdn.jsdelivr.net/npm/@toclocoinc/lattice-grid@1.27.0/modules/react.esm.min.js';
  import { createChart } from 'https://cdn.jsdelivr.net/npm/@toclocoinc/lattice-grid@1.27.0/modules/charts.esm.min.js';

  const LatticeGrid = createLatticeGrid({ React, createGrid });

  const columns = [
    { field: 'symbol', title: 'Symbol', layout: { pin: 'start', width: 120 } },
    { field: 'desk', title: 'Desk', filter: { type: 'set' } },
    { field: 'price', title: 'Price', type: 'number', format: { decimals: 4 } },
    { field: 'volume', title: 'Volume', type: 'number', format: { notation: 'compact' } },
  ];

  const rows = [/* trading records, one per instrument */];

  function App() {
    const gridRef = React.useRef(null);

    React.useEffect(() => {
      const grid = gridRef.current.grid;
      // The bars depend on where the bin edges fall; the density curve has no
      // edges, so laying one over the other separates the shape of the data from
      // the choice of buckets. The chart reads the live grid through the ref.
      createChart({ grid, container: '#chart', type: 'histogram', y: 'price',
        buckets: 20, curve: true, title: 'Price, with a density curve' });
    }, []);

    return (
      <>
        <div id="chart" style={{ height: '340px' }} />
        <LatticeGrid
          ref={gridRef}
          rowKey="id"
          columns={columns}
          rows={rows}
          style={{ height: '320px', marginTop: '14px' }}
        />
      </>
    );
  }

  createRoot(document.getElementById('app')).render(<App />);
</script>