<template>
  <div>
    <div id="chart">
      <apexchart
        type="bubble"
        height="350"
        :options="chartOptions"
        :series="series"
      ></apexchart>
    </div>
  </div>
</template>

<script>
import VueApexCharts from 'vue-apexcharts'

// Seeded PRNG so the bubbles are identical on every load (stable snapshots).
var __seed = 0x7ab19c3d
function rand() {
  __seed |= 0
  __seed = (__seed + 0x6d2b79f5) | 0
  var t = Math.imul(__seed ^ (__seed >>> 15), 1 | __seed)
  t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t
  return ((t ^ (t >>> 14)) >>> 0) / 4294967296
}

// Each point is [revenue $M, growth %, headcount]. The third value is the
// bubble size, so a bigger bubble = a bigger workforce.
function generateData(count, xrange, yrange, zrange) {
  var series = []
  for (var i = 0; i < count; i++) {
    var x = Math.floor(rand() * (xrange.max - xrange.min + 1)) + xrange.min
    var y = Math.floor(rand() * (yrange.max - yrange.min + 1)) + yrange.min
    var z = Math.floor(rand() * (zrange.max - zrange.min + 1)) + zrange.min
    series.push([x, y, z])
  }
  return series
}

export default {
  components: {
    apexchart: VueApexCharts,
  },
  data: function () {
    return {
      series: [
        {
          name: 'SaaS',
          data: generateData(
            12,
            { min: 20, max: 200 },
            { min: 25, max: 65 },
            { min: 20, max: 60 },
          ),
        },
        {
          name: 'Retail',
          data: generateData(
            12,
            { min: 150, max: 480 },
            { min: 5, max: 30 },
            { min: 40, max: 75 },
          ),
        },
        {
          name: 'Fintech',
          data: generateData(
            12,
            { min: 60, max: 320 },
            { min: 15, max: 50 },
            { min: 15, max: 55 },
          ),
        },
        {
          name: 'Hardware',
          data: generateData(
            12,
            { min: 100, max: 400 },
            { min: 2, max: 20 },
            { min: 30, max: 70 },
          ),
        },
      ],
      chartOptions: {
        chart: {
          height: 350,
          type: 'bubble',
        },
        dataLabels: {
          enabled: false,
        },
        fill: {
          opacity: 0.8,
        },
        title: {
          text: 'Companies: Revenue vs Growth',
        },
        subtitle: {
          text: 'Bubble size = headcount',
        },
        xaxis: {
          tickAmount: 10,
          type: 'numeric',
          min: 0,
          max: 500,
          title: {
            text: 'Revenue ($M)',
          },
        },
        yaxis: {
          max: 70,
          title: {
            text: 'YoY Growth (%)',
          },
        },
      },
    }
  },
}
</script>

<style>
#chart {
  max-width: 650px;
  margin: 35px auto;
}
</style>