将ChartPanel添加到JPanel

Question

I've got some not working code here:

    XYSeriesCollection dataset = new XYSeriesCollection();
    dataset.addSeries(series);
    JFreeChart chart = ChartFactory.createXYLineChart(null, null, null, dataset, PlotOrientation.HORIZONTAL, true, true, true);
    ChartPanel chartpanel = new ChartPanel(chart);

    chartpanel.setDomainZoomable(true);
    jPanel4.setLayout(new BorderLayout());
    jPanel4.add(chartpanel, BorderLayout.NORTH);

So the problem is that the jPanel4 with a chart is not visible. When I add my chartpanel to a frame and make it visible, it works.

Anyone knows what's my mistake?

Answer 1

This works perfectly fine for me:

import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JPanel;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

public class Main {
    public static void main(String[] args) {
        XYSeries series = new XYSeries("asdf");
        for (int i = 0; i < 100; i++)
            series.add(i, Math.random());
        XYSeriesCollection dataset = new XYSeriesCollection(series);
        JFreeChart chart = ChartFactory.createXYLineChart(null, null, null, dataset, PlotOrientation.HORIZONTAL, true, true, true);
        ChartPanel chartpanel = new ChartPanel(chart);
        chartpanel.setDomainZoomable(true);

        JPanel jPanel4 = new JPanel();
        jPanel4.setLayout(new BorderLayout());
        jPanel4.add(chartpanel, BorderLayout.NORTH);

        JFrame frame = new JFrame();
        frame.add(jPanel4);
        frame.pack();
        frame.setVisible(true);
    }
}

Can you provide us with a bit more code? Do you put something else into jPanel4 ? There can not be more than one component in every spot ( NORTH, SOUTH, WEST, EAST, CENTER ). Do you put your panel into a frame?

Answer 2

do u have anything in CENTER Layout in jpanel else try adding chart in center

ChartPanel chartpanel = new ChartPanel(chart);
chartpanel.setDomainZoomable(true);
jPanel4.add(chartpanel, BorderLayout.CENTER);

NORTH is actually top of the container.