Adding line markers to interactive charts...

[alex]

Is there any way to do this? I can't find the appropriate page in the
manual...

It's clearly possible for image charts:
http://code.google.com/apis/chart/image/docs/chart_params.html#gcharts_line_markers

Thanks in advance!

[Roni Biran]

Hi Alex,

You can use the ComboChart to do that  (http://code.google.com/apis/chart/interactive/docs/gallery/combochart.html)

All you need to do is define which series use what chart type.

You can play on the playground (http://code.google.com/apis/ajax/playground/?type=visualization#combo_chart)

For your simple example, generate duplicated data series, the first will be a bar chart and the second line. That will give you the requested result.

Hope that helped,

Roni

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[Roni Biran]

Hi Alex (once again),

You can place the following script on the playground

function drawVisualization() {
  // Some raw data (not necessarily accurate)
  var rowData = [['Month', 'Bolivia', 'Bolivia Line'],
                 ['2004/05', 165, 165],
                 ['2005/06', 135, 135],
                 ['2006/07', 157, 157],
                 ['2007/08', 139, 139],
                 ['2008/09', 136, 136]];

  // Create and populate the data table.
  var data = google.visualization.arrayToDataTable(rowData);

  // Create and draw the visualization.
  var ac = new google.visualization.ComboChart(document.getElementById('visualization'));
  ac.draw(data, {
    title : 'Monthly Coffee Production by Country',
    width: 600,
    height: 400,
    vAxis: {title: "Cups"},
    hAxis: {title: "Month"},
    seriesType: "bars",
    series: {1: {type: "line"}}
  });
}​

Enjoy,

Roni