multipledatasetdemo1.java

jfreechart帮助文档

/* -------------------------
 * MultipleDatasetDemo1.java
 * -------------------------
 * (C) Copyright 2004, 2005, by Object Refinery Limited.
 * 
 */

package demo;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JPanel;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.StandardXYItemRenderer;
import org.jfree.data.time.Day;
import org.jfree.data.time.RegularTimePeriod;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RectangleInsets;
import org.jfree.ui.RefineryUtilities;

/**
 * A demo showing the addition and removal of multiple datasets / renderers.
 */
public class MultipleDatasetDemo1 extends ApplicationFrame 
                                  implements ActionListener {

    /** The plot. */
    private XYPlot plot;
   
    /** The index of the last dataset added. */
    private int datasetIndex = 0;
    
    /**
     * Constructs a new demonstration application.
     *
     * @param title  the frame title.
     */
    public MultipleDatasetDemo1(String title) {

        super(title);
        TimeSeriesCollection dataset1 = createRandomDataset("Series 1");
        JFreeChart chart = ChartFactory.createTimeSeriesChart(
            "Multiple Dataset Demo 1", "Time", "Value", dataset1, 
            true, true, false
        );
        chart.setBackgroundPaint(Color.white);
        
        this.plot = chart.getXYPlot();
        this.plot.setBackgroundPaint(Color.lightGray);
        this.plot.setDomainGridlinePaint(Color.white);
        this.plot.setRangeGridlinePaint(Color.white);
        this.plot.setAxisOffset(new RectangleInsets(4, 4, 4, 4));
        ValueAxis axis = this.plot.getDomainAxis();
        axis.setAutoRange(true);

        NumberAxis rangeAxis2 = new NumberAxis("Range Axis 2");
        rangeAxis2.setAutoRangeIncludesZero(false);
        
        JPanel content = new JPanel(new BorderLayout());

        ChartPanel chartPanel = new ChartPanel(chart);
        content.add(chartPanel);
        
        JButton button1 = new JButton("Add Dataset");
        button1.setActionCommand("ADD_DATASET");
        button1.addActionListener(this);
        
        JButton button2 = new JButton("Remove Dataset");
        button2.setActionCommand("REMOVE_DATASET");
        button2.addActionListener(this);

        JPanel buttonPanel = new JPanel(new FlowLayout());
        buttonPanel.add(button1);
        buttonPanel.add(button2);
        
        content.add(buttonPanel, BorderLayout.SOUTH);
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
        setContentPane(content);

    }

    /**
     * Creates a random dataset.
     * 
     * @param name  the series name.
     * 
     * @return The dataset.
     */
    private TimeSeriesCollection createRandomDataset(final String name) {
        TimeSeries series = new TimeSeries(name);
        double value = 100.0;
        RegularTimePeriod t = new Day();
        for (int i = 0; i < 50; i++) {
            series.add(t, value);
            t = t.next();
            value = value * (1.0 + Math.random() / 100);
        }
        return new TimeSeriesCollection(series);
    }
    
    /**
     * Handles a click on the button by adding new (random) data.
     *
     * @param e  the action event.
     */
    public void actionPerformed(final ActionEvent e) {
       
        if (e.getActionCommand().equals("ADD_DATASET")) {
            if (this.datasetIndex < 20) {
                this.datasetIndex++;
                this.plot.setDataset(
                    this.datasetIndex, createRandomDataset(
                        "S" + this.datasetIndex
                    )
                );
                this.plot.setRenderer(
                    this.datasetIndex, new StandardXYItemRenderer()
                );
            }
        }
        else if (e.getActionCommand().equals("REMOVE_DATASET")) {
            if (this.datasetIndex >= 1) {
                this.plot.setDataset(this.datasetIndex, null);
                this.plot.setRenderer(this.datasetIndex, null);
                this.datasetIndex--;
            }
        }
        
    }

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

        MultipleDatasetDemo1 demo = new MultipleDatasetDemo1(
            "Multiple Dataset Demo 1"
        );
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);

    }

}