demo D189

Quantile colour scales in React

A scale that ignores the outlier flattening it

scale: { from: 'quantile' }

This grid shades a column by quantile rather than by raw range, so one extreme value does not flatten the colour for everything else. It keeps a heat map readable when the data is skewed, spreading colour by rank so the middle of the distribution still shows contrast.

Building…

Loading a live grid…

This is the React version. The grid mounts through the createLatticeGrid adapter, which takes its configuration as ordinary props and hands back the live grid through a ref. The grid below is the same one every other tab runs.

The configuration

<link rel="stylesheet" href="https://cdn.latticegrid.dev/lattice-grid@1.108.0/lattice-grid.min.css">

<div id="grid"></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.latticegrid.dev/lattice-grid@1.108.0/lattice-grid.esm.min.js';
  import createLatticeGrid from 'https://cdn.latticegrid.dev/lattice-grid@1.108.0/modules/react.esm.min.js';

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

  // The same skewed column, two scales. A min-max scale is flattened by one
  // large value; a quantile scale spans the 5th to 95th percentile instead.
  const formatting = {
    'v-minmax':   [{ scale: { from: 'minmax', colours: ['#f5f7fa', '#1a6bc7'] } }],
    'v-quantile': [{ scale: { from: 'quantile', low: 5, high: 95, colours: ['#f5f7fa', '#1a6bc7'] } }],
  };

  const columns = [
    { field: 'node', title: 'Node', layout: { pin: 'start', width: 150 } },
    { field: 'value', id: 'v-minmax', title: 'min-max scale', type: 'number' },
    { field: 'value', id: 'v-quantile', title: 'quantile scale', type: 'number' },
    { field: 'value', title: 'value', type: 'number' },
  ];

  const rows = [/* a skewed set of node readings */];

  function App() {
    return (
      <LatticeGrid
        rowKey="id"
        formatting={formatting}
        columns={columns}
        rows={rows}
        style={{ height: '460px' }}
      />
    );
  }

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