normaldistributiondemo.java

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/* ---------------------------
 * NormalDistributionDemo.java
 * ---------------------------
 * (C) Copyright 2004, 2005, by Object Refinery Limited.
 *
 */

package demo;

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.function.Function2D;
import org.jfree.data.function.NormalDistributionFunction2D;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

/**
 * This demo shows a normal distribution function.
 */
public class NormalDistributionDemo extends ApplicationFrame {

    /**
     * A demonstration application showing a normal distribution.
     *
     * @param title  the frame title.
     */
    public NormalDistributionDemo(String title) {
        super(title);
        JPanel chartPanel = createDemoPanel();
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
        setContentPane(chartPanel);
    }
    
    /**
     * Creates a panel for the demo (used by SuperDemo.java).
     * 
     * @return A panel.
     */
    public static JPanel createDemoPanel() {
        JFreeChart chart = createChart(createDataset());
        return new ChartPanel(chart);
    }
    
    /**
     * Creates a dataset with sample values from the normal distribution 
     * function.
     * 
     * @return A dataset.
     */
    public static XYDataset createDataset() {
        Function2D normal = new NormalDistributionFunction2D(0.0, 1.0);
        XYDataset dataset = DatasetUtilities.sampleFunction2D(normal, -5.0, 
                5.0, 100, "Normal");
        return dataset;
    }
    
    /**
     * Creates a line chart using the data from the supplied dataset.
     * 
     * @param dataset  the dataset.
     * 
     * @return The chart.
     */
    public static JFreeChart createChart(XYDataset dataset) {
        JFreeChart chart = ChartFactory.createXYLineChart(
            "Normal Distribution",
            "X", 
            "Y", 
            dataset,
            PlotOrientation.VERTICAL,
            true,
            true,
            false
        );
        return chart;
    }
    
    /**
     * Starting point for the demonstration application.
     *
     * @param args  ignored.
     */
    public static void main(String[] args) {

        NormalDistributionDemo demo = new NormalDistributionDemo(
                "Normal Distribution Demo");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);

    }

}