Horizontal Raincloud in JavaScript

// Raw observations per group (Box-Muller Gaussian; Math.random is seeded by
// the sample template). One group is deliberately bimodal: the cloud shows
// the two modes that the box alone would hide, which is the whole point of
// stacking all three layers.
function sample(mean, sd, n) {
  var points = []
  for (var k = 0; k < n; k++) {
    var u1 = Math.random(),
      u2 = Math.random()
    var g = Math.sqrt(-2 * Math.log(u1)) * Math.cos(2 * Math.PI * u2)
    points.push(Math.round((mean + g * sd) * 100) / 100)
  }
  return points
}

var options = {
  series: [
    {
      name: 'Bill ratio',
      data: [
        { x: 'Adelie', points: sample(2.12, 0.16, 150) },
        { x: 'Chinstrap', points: sample(2.65, 0.14, 70) },
        {
          x: 'Gentoo',
          points: sample(3.08, 0.1, 60).concat(sample(3.28, 0.09, 60)),
        },
      ],
    },
  ],
  chart: {
    type: 'raincloud',
    height: 420,
  },
  colors: ['#FE9C64', '#00A29B', '#2E93fA'],
  title: {
    text: 'Bill ratios of three penguin species',
  },
  subtitle: {
    text: 'Horizontal layout: cloud above the axis line, box and rain below',
  },
  plotOptions: {
    bar: {
      horizontal: true,
      distributed: true,
    },
  },
  legend: {
    show: false,
  },
  xaxis: {
    title: {
      text: 'Bill ratio (length / depth)',
    },
  },
}

var chart = new ApexCharts(document.querySelector('#chart'), options)
chart.render()