function2ddemo1.java

jfreechart1.0.6源程序,没有注释,不过都能运行起来

package demo;

import java.awt.Dimension;
import javax.swing.JPanel;
import org.jfree.chart.*;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.function.Function2D;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

public class Function2DDemo1 extends ApplicationFrame
{
    static class X2
        implements Function2D
    {

        public double getValue(double d)
        {
            return d * d + 2D;
        }

        X2()
        {
        }
    }


    public Function2DDemo1(String s)
    {
        super(s);
        JPanel jpanel = createDemoPanel();
        jpanel.setPreferredSize(new Dimension(500, 270));
        setContentPane(jpanel);
    }

    private static JFreeChart createChart(XYDataset xydataset)
    {
        JFreeChart jfreechart = ChartFactory.createXYLineChart("Function2DDemo1 ", "X", "Y", xydataset, PlotOrientation.VERTICAL, true, true, false);
        XYPlot xyplot = (XYPlot)jfreechart.getPlot();
        xyplot.getDomainAxis().setLowerMargin(0.0D);
        xyplot.getDomainAxis().setUpperMargin(0.0D);
        return jfreechart;
    }

    public static XYDataset createDataset()
    {
        XYDataset xydataset = DatasetUtilities.sampleFunction2D(new X2(), -4D, 4D, 40, "f(x)");
        return xydataset;
    }

    public static JPanel createDemoPanel()
    {
        JFreeChart jfreechart = createChart(createDataset());
        return new ChartPanel(jfreechart);
    }

    public static void main(String args[])
    {
        Function2DDemo1 function2ddemo1 = new Function2DDemo1("JFreeChart: Function2DDemo1.java");
        function2ddemo1.pack();
        RefineryUtilities.centerFrameOnScreen(function2ddemo1);
        function2ddemo1.setVisible(true);
    }
}