How to make plot a curve using JFreeChart?

Question

I have managed to plot a linear graph. The following is the code:

private JPanel createGraph() {

        JPanel panel = new JPanel();
        XYSeries series = new XYSeries("MyGraph");
        series.add(0, 1);
        series.add(1, 2);
        series.add(2, 5);
        series.add(7, 8);
        series.add(9, 10);


        XYSeriesCollection dataset = new XYSeriesCollection();
        dataset.addSeries(series);

        JFreeChart chart = ChartFactory.createXYLineChart(
                "XY Chart",
                "x-axis",
                "y-axis",
                dataset, 
                PlotOrientation.VERTICAL,
                true,
                true,
                false
                );
        ChartPanel chartPanel = new ChartPanel(chart);


        panel.add(chartPanel);

        return panel;
    }

However, it is not a smooth curve, but straight lines. How can I make it smooth please?

Without seeing the graph itself I think is because is how it is supposed to be. If you want a curve you should add more points to the graph that eventually forms a curve. — Averroes
– Averroes, Commented Dec 5, 2012 at 16:14
My graph is something similar to this: java2s.com/Code/Java/Chart/JFreeChartXYSeriesDemo.htm — Goaler444
– Goaler444, Commented Dec 5, 2012 at 16:18

GreyBeardedGeek · Accepted Answer · 2012-12-05 16:23:15Z

6

I believe that you are looking for XYSplineRenderer You should be able to do

chart.getXYPlot().setRenderer(new XYSplineRenderer());

after your chart is constructed.

answered Dec 5, 2012 at 16:23

GreyBeardedGeek

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