DynamicDataDemo 3 in Developer's Guide

android21 · Post by **android21** » Mon Jul 23, 2007 9:19 am

Dear David,
How do i upgrade this code, so that i don't need to press the button and the random data will just be plotted every 1 second automatically?

Thanks in advance.

jwenting · Post by **jwenting** » Mon Jul 23, 2007 10:06 am

Start a Timer somewhere that launches the code that's in the sample launched when pressing the button.

Post by **david.gilbert** » Mon Jul 23, 2007 10:22 am

jwenting wrote:Start a Timer somewhere that launches the code that's in the sample launched when pressing the button.

Yes. Look at the code for MemoryUsageDemo.java for a similar example.

android21 · Post by **android21** » Mon Jul 23, 2007 11:15 am

Thanks, I just did it

android21 · Post by **android21** » Mon Jul 23, 2007 6:10 pm

Dear David,
I just upgraded a little bit with DynamicDataDemo3.java, here is my code

Code: Select all

/* ---------------------
 * DynamicDataDemo3.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.BorderFactory;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.*;

import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.CombinedDomainXYPlot;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.StandardXYItemRenderer;
import org.jfree.chart.title.LegendTitle;
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.RectangleEdge;
import org.jfree.ui.RectangleInsets;
import org.jfree.ui.RefineryUtilities;
import org.jfree.util.UnitType;

/**
 * A demonstration application showing a time series chart where you can 
 * dynamically add (random) data by clicking on a button.
 */
public class DynamicDataDemo3 extends ApplicationFrame {

   
    
    static class DemoPanel extends JPanel implements ActionListener {
        
        /** The number of subplots. */
        public static final int SUBPLOT_COUNT = 3;
        
        /** The datasets. */
        private TimeSeriesCollection[] datasets;
        
        /** The most recent value added to series 1. */
        private double[] lastValue = new double[SUBPLOT_COUNT];
        
        /**Timer. **/
        Timer timer;
       
        /**
         * Creates a new self-contained demo panel.
         */
        public DemoPanel() {
            super(new BorderLayout());
            CombinedDomainXYPlot plot = new CombinedDomainXYPlot(
                new DateAxis("Time")
            );
            this.datasets = new TimeSeriesCollection[SUBPLOT_COUNT];
            
            for (int i = 0; i < SUBPLOT_COUNT; i++) {
                this.lastValue[i] = 100.0;
                TimeSeries series = new TimeSeries(
                    "Random " + i, Millisecond.class
                );
                this.datasets[i] = new TimeSeriesCollection(series);
                NumberAxis rangeAxis = new NumberAxis("Y" + i);
                rangeAxis.setAutoRangeIncludesZero(false);
                
                XYPlot subplot = new XYPlot(
                    this.datasets[i], null, rangeAxis, 
                    new StandardXYItemRenderer()
                );
                subplot.setBackgroundPaint(Color.lightGray);
                subplot.setDomainGridlinePaint(Color.white);
                subplot.setRangeGridlinePaint(Color.white);
                plot.add(subplot);
            }

            JFreeChart chart = new JFreeChart("Dynamic Data Demo 3", plot);
            LegendTitle legend = (LegendTitle) chart.getSubtitle(0);
            legend.setPosition(RectangleEdge.RIGHT);
            legend.setMargin(
                new RectangleInsets(UnitType.ABSOLUTE, 0, 4, 0, 4)
            );
            chart.setBorderPaint(Color.black);
            chart.setBorderVisible(true);
            chart.setBackgroundPaint(Color.white);
            
            plot.setBackgroundPaint(Color.lightGray);
            plot.setDomainGridlinePaint(Color.white);
            plot.setRangeGridlinePaint(Color.white);
            plot.setAxisOffset(new RectangleInsets(4, 4, 4, 4));
            ValueAxis axis = plot.getDomainAxis();
            axis.setAutoRange(true);
            axis.setFixedAutoRange(60000.0);  // 60 seconds

            ChartPanel chartPanel = new ChartPanel(chart);
            add(chartPanel);

            JPanel buttonPanel = new JPanel(new FlowLayout());
            
            for (int i = 0; i < SUBPLOT_COUNT; i++) {
                JButton button = new JButton("Series " + i);
                button.setActionCommand("ADD_DATA_" + i);
                button.addActionListener(this);
                buttonPanel.add(button);
            }
            JButton buttonAll = new JButton("ALL");
            buttonAll.setActionCommand("ADD_ALL");
            buttonAll.addActionListener(this);
            buttonPanel.add(buttonAll);
            
            add(buttonPanel, BorderLayout.SOUTH);
            chartPanel.setPreferredSize(new java.awt.Dimension(500, 470));
            chartPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
            
            
            timer= new Timer(100, new ActionListener(){
                     public void actionPerformed(ActionEvent evt){
                        for (int i = 0; i < SUBPLOT_COUNT; i++) {
                //if (evt.getActionCommand().endsWith(String.valueOf(i))) {
                    Millisecond now = new Millisecond();
                    System.out.println("Now = " + now.toString());
                    lastValue[i] = lastValue[i] 
                                        * (0.90 + 0.2 * Math.random());
                    
                    
                    datasets[i].getSeries(0).add(
                       new Millisecond(), lastValue[i]
                    );      
                   
                //}
            }
                     }
                }
            );
        }
        
        /**
         * Handles a click on the button by adding new (random) data.
         *
         * @param e  the action event.
         */
        
        
                
        public void actionPerformed(ActionEvent e) {
     
            for (int i = 0; i < SUBPLOT_COUNT; i++) {
                if (e.getActionCommand().endsWith(String.valueOf(i))) {
                    timer.start();
                   
                }
            }

                 
            if (e.getActionCommand().equals("ADD_ALL")) {
                Millisecond now = new Millisecond();
                System.out.println("Now = " + now.toString());
                for (int i = 0; i < SUBPLOT_COUNT; i++) {
                    this.lastValue[i] = this.lastValue[i] 
                                        * (0.90 + 0.2 * Math.random());
                    this.datasets[i].getSeries(0).add(
                        new Millisecond(), this.lastValue[i]
                    );       
                }
            }

        }

    }

    /**
     * Constructs a new demonstration application.
     *
     * @param title  the frame title.
     */
    public DynamicDataDemo3(String title) {
        super(title);
        setContentPane(new DemoPanel());
    }
    
    /**
     * Creates a panel for the demo (used by SuperDemo.java).
     * 
     * @return A panel.
     */
    public static JPanel createDemoPanel() {
        return new DemoPanel();
    }
    
    /**
     * Starting point for the demonstration application.
     *
     * @param args  ignored.
     */
    public static void main(String[] args) {
      
        DynamicDataDemo3 demo = new DynamicDataDemo3("Dynamic Data Demo 3");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);
        
        
    }

}

It is plotting data every 0.1 secs and after a while i notice that it is going very slow, and my CPU usage keeps increasing.... I am really in need to create an application where it can at least run for like an hour.... Is it storing all the previous points plotted? How do i discard them, so to free the memory?

Thanks, alot David.

android21 · Post by **android21** » Tue Jul 24, 2007 5:48 am

anyone else might help please? Thanks in advance.

android21 · Post by **android21** » Tue Jul 24, 2007 1:18 pm

I still can't figure out how to save the memory... can anyone help pls...

gizza · Post by **gizza** » Thu Oct 23, 2008 12:59 am

I got the same problem! In the beginning it thought it might be somewhere else but it wasnt.

Did you find the problem?

Thanks a lot!

Chris

Post by **david.gilbert** » Thu Oct 23, 2008 9:44 am

See this post:

http://www.jfree.org/phpBB2/viewtopic.php?t=26051