How to add a bar chart about officegen HOT 6 CLOSED

slide.addChart({
     title: 'Sample bar chart',
     renderType: 'bar', 
     data: [...]
 }, null, doneCallback, errorCallback);

var fs = require('fs');
var officegen = require('../');
    var chartInfo = {
      title: 'Sample bar chart',
      renderType: 'bar',
      xmlOptions: {
        "c:title": {
          "c:tx": {
            "c:rich": {
              "a:p": {
                "a:r": {
                  "a:t": "Override title via XML"
                }
              }
            }
          }
        }
      },
      data: [
        {
          name: 'europe',
          labels: ['Y2003', 'Y2004', 'Y2005'],
          values: [2.5, 2.6, 2.8],
          color: 'ff0000'
        },
        {
          name: 'namerica',
          labels: ['Y2003', 'Y2004', 'Y2005'],
          values: [2.5, 2.7, 2.9],
          color: '00ff00'
        },
        {
          name: 'asia',
          labels: ['Y2003', 'Y2004', 'Y2005'],
          values: [2.1, 2.2, 2.4],
          color: '0000ff'
        },
        {
          name: 'lamerica',
          labels: ['Y2003', 'Y2004', 'Y2005'],
          values: [0.3, 0.3, 0.3],
          color: 'ffff00'
        },
        {
          name: 'meast',
          labels: ['Y2003', 'Y2004', 'Y2005'],
          values: [0.2, 0.3, 0.3],
          color: 'ff00ff'
        },
        {
          name: 'africa',
          labels: ['Y2003', 'Y2004', 'Y2005'],
          values: [0.1, 0.1, 0.1],
          color: '00ffff'
        }

      ]
    };

    var chartIdx = 3;
    var pptx = officegen('pptx');
    pptx.setDocTitle('Sample PPTX Document');
    var slide = pptx.makeNewSlide();
    slide.name = 'OfficeChart slide';
    slide.back = 'ffffff';

    slide.addChart(
        chartInfo,
        null,
        function () {
          var FILENAME = "test-ppt-chart" + chartIdx + ".pptx";
          var FILENAME_ALT = "test-ppt-chart-" + chartInfo.renderType + ".pptx";
          var out = fs.createWriteStream('/tmp/' + FILENAME_ALT);
          pptx.generate(out, {
            'finalize': function (written) {
              console.log("Done!")
            },
            'error': console.error
          });
        },  console.error);