demo D205

Density over a histogram in Svelte

A kernel density estimate over the bars, so binning and data separate

curve: true, buckets

This draws a kernel density estimate over a histogram of the same column, so the smooth shape and the binning are kept separate. It shows the underlying distribution without being misled by the choice of bin widths.

Building…

Loading a live grid…

This is the Svelte version. A use action attaches the grid to a plain element, so no framework runtime is passed in and the component stays small, while the configuration is ordinary Svelte state.

The configuration

<script>
  import { createGrid } from 'https://cdn.latticegrid.dev/lattice-grid@1.107.0/lattice-grid.esm.min.js';
  import createLatticeAction from 'https://cdn.latticegrid.dev/lattice-grid@1.107.0/modules/svelte.esm.min.js';
  import { createChart } from 'https://cdn.latticegrid.dev/lattice-grid@1.107.0/modules/charts.esm.min.js';

  const lattice = createLatticeAction({ createGrid });

  let chartEl;

  const config = {
    rowKey: 'id',
    columns: [
      { field: 'symbol', title: 'Symbol' },
      { field: 'desk', title: 'Desk', filter: { type: 'set' } },
      { field: 'price', title: 'Price', type: 'number', format: { decimals: 4 } },
      { field: 'bid', title: 'Bid', type: 'number', format: { decimals: 4 } },
      { field: 'ask', title: 'Ask', type: 'number', format: { decimals: 4 } },
      { field: 'volume', title: 'Volume', type: 'number', format: { notation: 'compact' } },
      { field: 'notional', title: 'Notional', type: 'number',
        format: { style: 'currency', currency: 'USD' }, total: 'sum' },
    ],
    rows,  // instruments: symbol, desk, price, bid, ask, volume, notional
    // onGrid hands over the live grid the moment it is created. curve draws a
    // density estimate over the bars, so the bins and the data read apart;
    // buckets sets how many bins. Both follow the grid's filters.
    onGrid: (grid) => {
      createChart({ grid, container: chartEl, type: 'histogram', y: 'price', buckets: 20, curve: true });
    },
  };
</script>

<svelte:head>
  <link rel="stylesheet" href="https://cdn.latticegrid.dev/lattice-grid@1.107.0/lattice-grid.min.css">
</svelte:head>

<div bind:this={chartEl} style="height: 340px"></div>
<div use:lattice={config} style="height: 340px; margin-top: 14px"></div>