javascript - Google Chart - More then 1 difference column

Question

In google charts, you can create a diffChart which will give you a nice representation of data by showing 1 series of data in front of the other, like so

Problem is i need to do this with more then 2 series, i would like to do it with up to 4, stacking each item in front of each other. Is this possible using google charts?? I do not care if i have to use different google charts to accomplish this, but i need the 4 series in front of each other, NOT side by side

Here is an example plunkr, but it only compares the 2 first data sets

http://jsfiddle.net/Gillardo/nv8kb58y/5/

function drawChart() {
    var oldData = google.visualization.arrayToDataTable([
      ['Name', 'Popularity'],
      ['Cesar', 250],
      ['Rachel', 4200],
      ['Patrick', 2900],
      ['Eric', 8200]
    ]);

    var newData = google.visualization.arrayToDataTable([
      ['Name', 'Popularity'],
      ['Cesar', 370],
      ['Rachel', 600],
      ['Patrick', 700],
      ['Eric', 1500]
    ]);

    var thirdData = google.visualization.arrayToDataTable([
      ['Name', 'Popularity'],
      ['Cesar', 100],
      ['Rachel', 100],
      ['Patrick', 100],
      ['Eric', 100]
    ]);

    var colChartDiff = new google.visualization.ColumnChart(document.getElementById('chart_div'));
    var options = { legend: { position: 'top' } };
    var diffData = colChartDiff.computeDiff(oldData, newData);
    var diffData2 = colChartDiff.computeDiff(diffData, thirdData);
    colChartDiff.draw(diffData, options);

    console.log(diffData2);
  }

google.load("visualization", "1", {packages:["corechart"]});
google.setOnLoadCallback(drawChart);

Answer 1

the computeDiff method will only evaluate two data sets

one option would be to stack multiple charts on top of each other,
although it will require some manipulation...

position all the chart containers at the same coordinates
use separate chart options to change the color and size of the bars
set specific vAxis.viewWindow on all charts
remove repeated labels (x-axis in data, ticks on y-axis, etc...)

see following working snippets...

Example with 3

google.charts.load('current', {
  packages: ['bar', 'controls', 'corechart']
}).then(function () {
  var data0 = google.visualization.arrayToDataTable([
    ['Name', 'Popularity 0'],
    ['Cesar', 250],
    ['Rachel', 4200],
    ['Patrick', 2900],
    ['Eric', 8200]
  ]);

  var data1 = google.visualization.arrayToDataTable([
    ['Name', 'Popularity 1'],
    ['', 370],
    ['', 600],
    ['', 700],
    ['', 1500]
  ]);

  var data2 = google.visualization.arrayToDataTable([
    ['Name', 'Popularity 2'],
    ['', 1370],
    ['', 1600],
    ['', 1700],
    ['', 500]
  ]);

  var options0 = {
    backgroundColor: 'transparent',
    colors: ['red'],
    height: 400,
    legend: {
      position: 'top'
    },
    vAxis: {
      viewWindow: {
        min: 0,
        max: 10000
      }
    },
    width: 600
  };

  var options1 = {
    backgroundColor: 'transparent',
    bar: {
      groupWidth: 40
    },
    colors: ['blue'],
    height: 400,
    legend: {
      position: 'top',
      alignment: 'center'
    },
    vAxis: {
      ticks: [{v: 0, f: ''}],
      viewWindow: {
        min: 0,
        max: 10000
      }
    },
    width: 600
  };

  var options2 = {
    backgroundColor: 'transparent',
    bar: {
      groupWidth: 20
    },
    colors: ['green'],
    height: 400,
    legend: {
      position: 'top',
      alignment: 'end'
    },
    vAxis: {
      ticks: [{v: 0, f: ''}],
      viewWindow: {
        min: 0,
        max: 10000
      }
    },
    width: 600
  };

  var colChart0 = new google.visualization.ColumnChart(document.getElementById('chart_div_0'));
  var colChart1 = new google.visualization.ColumnChart(document.getElementById('chart_div_1'));
  var colChart2 = new google.visualization.ColumnChart(document.getElementById('chart_div_2'));

  colChart0.draw(data0, options0);
  colChart1.draw(data1, options1);
  colChart2.draw(data2, options2);
});

.chart {
  position: absolute;
  left: 0px;
  top: 0px;
}

<script src="https://www.gstatic.com/charts/loader.js"></script>
<div class="chart" id="chart_div_0"></div>
<div class="chart" id="chart_div_1"></div>
<div class="chart" id="chart_div_2"></div>