It depends on how you have your data set up. You can assign colors to (data
table) columns, so if you set it up like this:
function drawChart() {
var data = new google.visualization.DataTable();
data.addColumn('string', 'Month');
data.addColumn('number', '2010');
data.addColumn('number', '2011');
data.addRow();
data.setValue(0, 0, "January");
data.setValue(0, 1, <data for Jan 2010>);
data.setValue(0, 2, <data for Jan 2011>);
etc...
var options = {colors: ['#FF0000', '#0000FF']};
var chart = new
google.visualization.ColumnChart(document.getElementById('chartDiv'));
chart.draw(data, options);
}
you get a chart of data for years grouped by months, with 2010 being red and
2011 being blue.
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