jmathplot doesn't work in swing application

问题

I'm trying to use the jmathplot library in a swing application.

Problem is, it doesn't seem to work when I add it to a JPanel as follows:

    // create your PlotPanel (you can use it as a JPanel)
    double[] x = new double[] { 0, 1, 2, 3, 4, 5 };
    double[] y = new double[] { 10, 11, 12, 14, 15, 16 };


    // create your PlotPanel (you can use it as a JPanel)
    Plot2DPanel graph = new Plot2DPanel();
    graph.setBounds(0, 0, 782, 272);

    // add a line plot to the PlotPanel
    graph.addLinePlot("my plot", x, y);

    JPanel panel = new JPanel();
    panel.setBounds(10, 333, 782, 272);
    tab_analysis.add(panel);
    panel.setLayout(null);
    panel.add(graph);

Because the plot doesn't show up and I get weird axes as well:

The site states:

use the PlotPanel as any Swing component (all PlotPanel extends JPanel, in fact)

What do I do wrong?

回答1:

works with NullLayout, without any issue, but I'm quite not familair with this layout manager (delegate Insets from parent), then I'm leaving any comments about
simple don't to use NullLayout
override getPreferredSize for Plot2DPanel
JPanel has FLowLayout (with the same output as from NullLayout! on resize), accepting only PreferredSize, child aren't resizable with its contianer, is required to use BorderLayout/GridLayout for simple graph

from code

import java.awt.BorderLayout;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import org.math.plot.Plot2DPanel;

public class MyPlot {

    private JFrame frame = new JFrame("JMathPlot library in a swing application.");
    private JPanel panel = new JPanel();

    public MyPlot() {
        double[] x = new double[]{0, 1, 2, 3, 4, 5};
        double[] y = new double[]{10, 11, 12, 14, 15, 16};
        Plot2DPanel plot = new Plot2DPanel() {
            @Override
            public Dimension getPreferredSize() {
                return new Dimension(400, 200);
            }
        };
        plot.addLinePlot("my plot", x, y); // add a line plot to the PlotPanel
        panel.setLayout(new BorderLayout());
        panel.add(plot);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(panel);
        frame.pack();
        frame.setLocation(150, 150);
        frame.setVisible(true);
    }

    public static void main(String[] args) {

        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new MyPlot();
            }
        });
    }
}