[JFreeChart] Graphe qui avance dans le temps

**Premium** · 18/05/2007, 16h33

Bonjour,

sur le net, j'ai trouvé le code suivant qui permet de faire avancer dans le temps le graphe chaque fois que l'on clique sur Add New Data Item.
Voici le code :

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

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import java.awt.BorderLayout;
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.ValueAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.time.Millisecond;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
 
/**
 * A demonstration application showing a time series chart where you can dynamically add
 * (random) data by clicking on a button.
 */
public class DynamicDataDemo extends ApplicationFrame implements ActionListener {
 
    /** The time series data. */
    private TimeSeries series;
 
    /** The most recent value added. */
    private double lastValue = 100.0;
 
    /**
     * Constructs a new demonstration application.
     *
     * @param title  the frame title.
     */
    public DynamicDataDemo(String title) {
 
        super(title);
        this.series = new TimeSeries("Random Data", Millisecond.class);
        TimeSeriesCollection dataset = new TimeSeriesCollection(this.series);
        JFreeChart chart = createChart(dataset);
 
        ChartPanel chartPanel = new ChartPanel(chart);
        JButton button = new JButton("Add New Data Item");
        button.setActionCommand("ADD_DATA");
        button.addActionListener(this);
 
        JPanel content = new JPanel(new BorderLayout());
        content.add(chartPanel);
        content.add(button, BorderLayout.SOUTH);
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
        setContentPane(content);
 
    }
 
    private JFreeChart createChart(XYDataset dataset) {
        JFreeChart result = ChartFactory.createTimeSeriesChart(
            "Dynamic Data Demo", 
            "Time", 
            "Value",
            dataset, 
            true, 
            true, 
            false
        );
        XYPlot plot = result.getXYPlot();
        ValueAxis axis = plot.getDomainAxis();
        axis.setAutoRange(true);
        axis.setFixedAutoRange(60000.0);  // 60 seconds
        axis = plot.getRangeAxis();
        axis.setRange(0.0, 200.0); 
        return result;
    }
 
    /**
     * Handles a click on the button by adding new (random) data.
     *
     * @param e  the action event.
     */
    public void actionPerformed(ActionEvent e) {
        if (e.getActionCommand().equals("ADD_DATA")) {
            double factor = 0.90 + 0.2 * Math.random();
            this.lastValue = this.lastValue * factor;
            Millisecond now = new Millisecond();
            System.out.println("Now = " + now.toString());
            this.series.add(new Millisecond(), this.lastValue);
        }
    }
 
    /**
     * Starting point for the demonstration application.
     *
     * @param args  ignored.
     */
    public static void main(String[] args) {
 
        DynamicDataDemo demo = new DynamicDataDemo("Dynamic Data Demo");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);
 
    }
 
}

J'aimerai obtenir la même chose sans avoir à cliquer sur le bouton.
J'ai modifié le code comme ceci mais ça ne fonctionne pas :

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

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import java.awt.BorderLayout;
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.ValueAxis;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.time.Millisecond;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
 
/**
 * A demonstration application showing a time series chart where you can dynamically add
 * (random) data by clicking on a button.
 */
public class DynamicDataDemo extends ApplicationFrame implements ActionListener {
 
    /** The time series data. */
    private TimeSeries series;
 
    /** The most recent value added. */
    private double lastValue = 100.0;
 
    /**
     * Constructs a new demonstration application.
     *
     * @param title  the frame title.
     */
    public DynamicDataDemo(String title) {
 
        super(title);
        this.series = new TimeSeries("Random Data", Millisecond.class);
        TimeSeriesCollection dataset = new TimeSeriesCollection(this.series);
        JFreeChart chart = createChart(dataset);
 
        ChartPanel chartPanel = new ChartPanel(chart);
        JButton button = new JButton("Add New Data Item");
        button.setActionCommand("ADD_DATA");
        button.addActionListener(this);
 
        JPanel content = new JPanel(new BorderLayout());
        content.add(chartPanel);
        content.add(button, BorderLayout.SOUTH);
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
        setContentPane(content);
 
    }
 
    private JFreeChart createChart(XYDataset dataset) {
        JFreeChart result = ChartFactory.createTimeSeriesChart(
            "Dynamic Data Demo", 
            "Time", 
            "Value",
            dataset, 
            true, 
            true, 
            false
        );
        XYPlot plot = result.getXYPlot();
        ValueAxis axis = plot.getDomainAxis();
        axis.setAutoRange(true);
        axis.setFixedAutoRange(60000.0);  // 60 seconds
        axis = plot.getRangeAxis();
        axis.setRange(0.0, 200.0); 
        return result;
    }
 
 
    /**
     * Handles a click on the button by adding new (random) data.
     *
     * @param e  the action event.
     */
    public void actionPerformed(ActionEvent e) {
        if (e.getActionCommand().equals("ADD_DATA")) {
            double factor = 0.90 + 0.2 * Math.random();
            this.lastValue = this.lastValue * factor;
            Millisecond now = new Millisecond();
            System.out.println("Now = " + now.toString());
            this.series.add(new Millisecond(), this.lastValue);
        }
    }
 
    /**
     * Starting point for the demonstration application.
     *
     * @param args  ignored.
     */
    public static void main(String[] args) {
 
        DynamicDataDemo demo = new DynamicDataDemo("Dynamic Data Demo");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);
 
    }
 
}