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troubleshooting Question

Semi circle donut using Google visualization

Avatar of Steynsk
SteynskFlag for Netherlands asked on
JavaScriptGoogle* chart
5 Comments1 Solution940 ViewsLast Modified:
Hi Experts,

I'm building a reservation site for a nonprofit organisation. And I'd like to add a chart in the management section.
I try to create a semi circle donut chart that shows the status of occupation in percentage and numbers of chairs in a theater.
The maximum amount of  chairs that can be occupied is 400. The data we have available is the amount of chairs occupied.

Can someone please help me to adapt the sample below so that it shows number of chairs and percentage of occupied and free chairs in this semi circle donut chart?

   <script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
   <script type="text/javascript">
google.charts.load('current', {
  callback: function () {
    var data = [
      ['Task', 'Hours'],
      ['Occupied',  19.2],
      ['Free',  30.8],
      [null, 50.0]

    var total = 0;
    for (var i = 1; i < data.length; i++) {
      if (data[i][0] !== null) {
        total += data[i][1];

    var numberFormat = new google.visualization.NumberFormat({
      pattern: '#,##0.0',
      suffix: '%'

    var dataTable = google.visualization.arrayToDataTable(data);
    for (var i = 0; i < dataTable.getNumberOfRows(); i++) {
      if (dataTable.getValue(i, 0) !== null) {
        dataTable.setFormattedValue(i, 1);

    var chart = new google.visualization.PieChart(document.getElementById('chart_div'));

    var options = {
	  title: 'Status of chairs',
      height: 400,
      chartArea: {
        top: 24
      colors: ['#8BC34A', '#64B5F6'],
      pieHole: 0.4,
      pieStartAngle: 270,
      pieSliceText: 'label',
      slices: {
        2: {
          color: 'transparent'
      theme: 'maximized',
      width: 400

    chart.draw(dataTable, options);
  packages: ['corechart']


    <div id="chart_div" style="width: 400px; height: 120px;"></div>