no chart visible

Hi all,

I'm new to jchart and want to use it for a simple bar chart in my 
application.

I looked at the user guide and the Swing example and my code looks like 
this:

String[] goCate = new String[data.length];
double[][] counts = new double[1][data.length];
...
DataSeries ds = new DataSeries(goCate, "GO terms", "Number of hits",
    "Histogram");

AxisChartDataSet axds = new AxisChartDataSet(counts, new String[]{""}, 

    new Paint[]{Color.blue.darker()}, ChartType.BAR, new
    BarChartProperties());

ds.addIAxisPlotDataSet(axds);
AxisChart ac = new AxisChart(ds, new ChartProperties(), new
    AxisProperties(), null, 300, 400);

histogramFrame.setVisible(true);
ac.setGraphics2D((Graphics2D) histogramPanel.getGraphics());
ac.render();


However, if I run the application I only get an empty frame without 
chart. Does anybody have an idea what I could be doing wrong?

Thanks,
Andreas


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