movingaveragedemo.java

在软件开发中用来绘制各种图表的源码

/* ----------------------
 * MovingAverageDemo.java
 * ----------------------
 * (C) Copyright 2003-2005, by Object Refinery Limited.
 *
 */

package demo;

import java.text.SimpleDateFormat;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.time.Month;
import org.jfree.data.time.MovingAverage;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

/**
 * An example showing the calculation of a moving average for a time series.
 */
public class MovingAverageDemo extends ApplicationFrame {

    /**
     * A moving average demo.
     *
     * @param title  the frame title.
     */
    public MovingAverageDemo(String title) {

        super(title);

        // create a title...
        String chartTitle = "Legal & General Unit Trust Prices";
        XYDataset dataset = createDataset();

        JFreeChart chart = ChartFactory.createTimeSeriesChart(
            chartTitle, 
            "Date", 
            "Price Per Unit",
            dataset,
            true,
            true,
            false
        );

        XYPlot plot = (XYPlot) chart.getPlot();
        XYItemRenderer renderer = plot.getRenderer();
        if (renderer instanceof XYLineAndShapeRenderer) {
            XYLineAndShapeRenderer rr = (XYLineAndShapeRenderer) renderer;
            rr.setShapesVisible(true);
            rr.setShapesFilled(true);
        }
        DateAxis axis = (DateAxis) plot.getDomainAxis();
        axis.setDateFormatOverride(new SimpleDateFormat("MMM-yyyy"));
        ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
        setContentPane(chartPanel);

    }

    /**
     * Creates a dataset, one series containing unit trust prices, the other a 
     * moving average.
     *
     * @return The dataset.
     */
    public XYDataset createDataset() {

        TimeSeries s1 = new TimeSeries("L&G European Index Trust", Month.class);
        s1.add(new Month(2, 2001), 181.8);
        s1.add(new Month(3, 2001), 167.3);
        s1.add(new Month(4, 2001), 153.8);
        s1.add(new Month(5, 2001), 167.6);
        s1.add(new Month(6, 2001), 158.8);
        s1.add(new Month(7, 2001), 148.3);
        s1.add(new Month(8, 2001), 153.9);
        s1.add(new Month(9, 2001), 142.7);
        s1.add(new Month(10, 2001), 123.2);
        s1.add(new Month(11, 2001), 131.8);
        s1.add(new Month(12, 2001), 139.6);
        s1.add(new Month(1, 2002), 142.9);
        s1.add(new Month(2, 2002), 138.7);
        s1.add(new Month(3, 2002), 137.3);
        s1.add(new Month(4, 2002), 143.9);
        s1.add(new Month(5, 2002), 139.8);
        s1.add(new Month(6, 2002), 137.0);
        s1.add(new Month(7, 2002), 132.8);
        
        TimeSeries s2 = MovingAverage.createMovingAverage(
            s1, "Six Month Moving Average", 6, 0
        );

        TimeSeriesCollection dataset = new TimeSeriesCollection();
        dataset.addSeries(s1);
        dataset.addSeries(s2);
        
        return dataset;

    }

    /**
     * Starting point for the demonstration application.
     *
     * @param args  ignored.
     */
    public static void main(String[] args) {

        MovingAverageDemo demo = new MovingAverageDemo("Moving Average Demo 1");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);

    }

}