What's wrong with this code?

[Arkkimaagi]

I have JFreeChart partially integrated to other things. However, I'm having problems with implementing the piechart.

Currently I'm using JFreeChart 0.9.20, but I'm planning to upgrade as soon as I can be sure that I have atleast one working version.

As a simplified example, I have modified the piechart demo 7.

Could someone please explain what's wrong with this approach? All I see is a blank image.

Similar approach has worked with most of the other chart types.

Thank you in advance.

Code: Select all

package org.jfree.chart.demo;
import java.awt.*;
import javax.swing.JPanel;
import org.jfree.chart.*;
import org.jfree.chart.plot.*;
import org.jfree.data.DefaultPieDataset;
import org.jfree.ui.*;
public class PieChartDemo7 extends ApplicationFrame {

    public PieChartDemo7(String title) {
        super(title);

        JPanel panel = new JPanel(new GridLayout());
        DefaultPieDataset dataset = new DefaultPieDataset();
        dataset.setValue("Section 1", 23.3);
        dataset.setValue("Section 2", 56.5);
        dataset.setValue("Section 3", 43.3);
        dataset.setValue("Section 4", 11.1);
       
        PiePlot singlePiePlot = new PiePlot();
        ((PiePlot)singlePiePlot).setDataset(((DefaultPieDataset)dataset));
        JFreeChart currentPie = new JFreeChart(singlePiePlot);
		
        // this part is in another file, that's why it's separated
		Plot plot=new MultiplePiePlot();
        ((MultiplePiePlot)plot).setPieChart(currentPie);
        JFreeChart chart1 = new JFreeChart(plot);
        panel.add(new ChartPanel(chart1));
        
		panel.setPreferredSize(new Dimension(800, 600));
        setContentPane(panel);
    }

    public static void main(String[] args) {
        PieChartDemo7 demo = new PieChartDemo7("Pie Chart Demo 7");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);
    }
}