Heat map

author(s): Torstein Hønsi

by fujigoko

HTML

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/heatmap.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>
<script src="https://code.highcharts.com/modules/export-data.js"></script>
<script src="https://code.highcharts.com/modules/accessibility.js"></script>

<figure class="highcharts-figure">
    <div id="container"></div>
</figure>

CSS

.highcharts-figure,
.highcharts-data-table table {
    min-width: 360px;
    max-width: 800px;
    margin: 1em auto;
}

.highcharts-data-table table {
    font-family: Verdana, sans-serif;
    border-collapse: collapse;
    border: 1px solid #ebebeb;
    margin: 10px auto;
    text-align: center;
    width: 100%;
    max-width: 500px;
}

.highcharts-data-table caption {
    padding: 1em 0;
    font-size: 1.2em;
    color: #555;
}

.highcharts-data-table th {
    font-weight: 600;
    padding: 0.5em;
}

.highcharts-data-table td,
.highcharts-data-table th,
.highcharts-data-table caption {
    padding: 0.5em;
}

.highcharts-data-table thead tr,
.highcharts-data-table tr:nth-child(even) {
    background: #f8f8f8;
}

.highcharts-data-table tr:hover {
    background: #f1f7ff;
}

JavaScript

Highcharts.chart('container', {

  chart: {
    type: 'heatmap',
    marginTop: 40,
    marginBottom: 80,
    plotBorderWidth: 1
  },

  xAxis: {
    type: 'datetime',
    min: Date.UTC(2023, 9, 1),
    max: Date.UTC(2023, 9, 5),
    labels: {
      align: 'center'
    }
  },

  yAxis: {
    type: 'datetime'
  },

  colorAxis: {
    min: 0,
    minColor: '#FFFFFF',
    maxColor: Highcharts.getOptions().colors[0]
  },

  legend: {
    align: 'right',
    layout: 'vertical',
    margin: 0,
    verticalAlign: 'top',
    y: 25,
    symbolHeight: 280
  },

  tooltip: {
    formatter: function () {
      var currentDate = new Date(0);
      currentDate.setUTCSeconds(this.point.x / 1000);
      return "current date: " + currentDate; // this.point.value
    },
    positioner: function () {
      return { x: 105, y: 55 };
    }
  },

  series: [{
    data: [
      [Date.UTC(2023, 9, 1), Date.UTC(2023, 9, 1), 15],
      [Date.UTC(2023, 9, 1), Date.UTC(2023, 9, 2), 30],
      [Date.UTC(2023, 9, 1), Date.UTC(2023, 9, 3), 45],
      [Date.UTC(2023, 9, 2), Date.UTC(2023, 9, 2), 15],
      [Date.UTC(2023, 9, 2), Date.UTC(2023, 9, 3), 30],
      [Date.UTC(2023, 9, 2), Date.UTC(2023, 9, 4), 45],
      [Date.UTC(2023, 9, 3), Date.UTC(2023, 9, 3), 15],
      [Date.UTC(2023, 9, 3), Date.UTC(2023, 9, 4), 30],
      [Date.UTC(2023, 9, 3), Date.UTC(2023, 9, 5), 45],
      [Date.UTC(2023, 9, 4), Date.UTC(2023, 9, 4), 15],
      [Date.UTC(2023, 9, 4), Date.UTC(2023, 9, 5), 30],
      [Date.UTC(2023, 9, 5), Date.UTC(2023, 9, 5), 15],
    ],
    colsize: 24 * 36e5,
    rowsize: 24 * 36e5,
    dataLabels: {
      enabled: true,
      color: '#000000'
    }
  }]

});