timeseriesdemo5.java

在软件开发中用来绘制各种图表的源码

/* --------------------
 * TimeSeriesDemo5.java
 * --------------------
 * (C) Copyright 2001-2004, by Object Refinery Limited.
 *
 */

package demo;

import java.awt.BasicStroke;

import javax.swing.JPanel;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.general.SeriesException;
import org.jfree.data.time.Day;
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;

/**
 * A time series chart with 4000 data points, to get an idea of how JFreeChart performs with a
 * larger dataset.  You can see that it slows down significantly, so this needs to be worked on
 * (4000 points is not that many!).
 *
 */
public class TimeSeriesDemo5 extends ApplicationFrame {
    
    /**
     * Creates a new demo instance.
     *
     * @param title  the frame title.
     */
    public TimeSeriesDemo5(String title) {
        
        super(title);
        XYDataset dataset = createDataset();
        JFreeChart chart = createChart(dataset);
        ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
        chartPanel.setMouseZoomable(true, false);
        setContentPane(chartPanel);
        
    }
       
    /**
     * Creates a sample dataset.
     * 
     * @return A sample dataset.
     */
    private static XYDataset createDataset() {
        
        TimeSeries series = new TimeSeries("Random Data");
        Day current = new Day(1, 1, 1990);
        double value = 100.0;
        for (int i = 0; i < 4000; i++) {
            try {
                value = value + Math.random() - 0.5;
                series.add(current, new Double(value));
                current = (Day) current.next();
            }
            catch (SeriesException e) {
                System.err.println("Error adding to series");
            }
        }
        return new TimeSeriesCollection(series);
    }
    
    /**
     * Creates a sample chart.
     * 
     * @param dataset  the dataset.
     * 
     * @return A sample chart.
     */
    private static JFreeChart createChart(XYDataset dataset) {
        JFreeChart chart = ChartFactory.createTimeSeriesChart(
            "Test", 
            "Day", 
            "Value", 
            dataset,
            false, 
            false, 
            false
        );
        XYPlot plot = (XYPlot) chart.getPlot();
        XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer();
        renderer.setBaseShapesVisible(false);
        renderer.setSeriesStroke(0, new BasicStroke(
                0.5f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND,
                5.0f, new float[] {5.0f, 10.0f}, 0.0f
            ));
        plot.setRenderer(renderer);
        return chart;
    }
    
    /**
     * 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);
    }
    
    /**
     * Starting point for the application.
     *
     * @param args  ignored.
     */
    public static void main(String[] args) {

        String title = "\u20A2\u20A2\u20A2\u20A3\u20A4\u20A5\u20A6\u20A7\u20A8\u20A9\u20AA";
        TimeSeriesDemo5 demo = new TimeSeriesDemo5(title);
        demo.pack();
        RefineryUtilities.positionFrameRandomly(demo);
        demo.setVisible(true);

    }

}