Dynamic chart in swing

[mallikarjun dontamsetti]

Hi i am in a project, my task is applet calling a swing application. In swing frame i have a dynamic time series chart. has to display with some random data. ihave developed chart in jfreechart. when i try to add that chart to my panel it is not working as i anticipated. my code is.

// chart class

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.GregorianCalendar;
import javax.swing.JPanel;
import javax.swing.Timer;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.*;
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.DynamicTimeSeriesCollection;
import org.jfree.data.time.Second;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.RectangleInsets;

/**
 *
 *  This class is to prepare a panel which has the dynamic
 * chart
 */
public class PrepareChart {

    private static final String TITLE = "Dynamic Series";
    private static final int COUNT = 2 * 60;
    private Timer timer;
    private static float lastValue = 49.62f;
    ValueAxis axis;
    DateAxis dateAxis;
    public JFreeChart chart;
    public PrepareChart() {
        super();

        final DynamicTimeSeriesCollection dataset = new DynamicTimeSeriesCollection(1, COUNT, new Second());
      
      // Get the calender date time which will inserted into time series chart
      // Based on time we are getting here we disply the chart
      Calendar calendar = new GregorianCalendar();
      int date = calendar.get(Calendar.DAY_OF_MONTH);
      int month = calendar.get(Calendar.MONTH);
      int year = calendar.get(Calendar.YEAR);
      int hours = calendar.get(Calendar.HOUR_OF_DAY);
      int minutes = calendar.get(Calendar.MINUTE);
      int seconds = calendar.get(Calendar.SECOND);
      
      System.out.println("mallikarjun");
      dataset.setTimeBase(new Second(seconds, minutes-2, hours, date, month, year));
      dataset.addSeries(gaussianData(), 0, "Currency Rate");
      
       chart= createChart(dataset);
      
        timer = new Timer(969, new ActionListener() {

            float[] newData = new float[1];
             
            public void actionPerformed(ActionEvent e) {
                newData[0] = randomValue();
                dataset.advanceTime();
                
                dataset.appendData(newData);
            }
        });
      
      
    }
    
    private float randomValue() {
      
      double factor = 2 * Math.random();
      if (lastValue >51){
        lastValue=lastValue-(float)factor;
      }else {
        lastValue = lastValue + (float) factor;
      }
        return  lastValue;
    }
    // For getting the a random float value which is supplied to dataset of time series chart
    private float[] gaussianData() {
        float[] a = new float[COUNT];
        for (int i = 0; i < a.length; i++) {
            a[i] = randomValue();
        }
        return a;
    }
     
    // This methode will create the chart in the required format
    private JFreeChart createChart(final XYDataset dataset) {  
        
        final JFreeChart result = ChartFactory.createTimeSeriesChart(TITLE, "hh:mm:ss", "Currency", dataset, true, true, false);
        
        final XYPlot plot = result.getXYPlot(); 
        
        plot.setBackgroundPaint(Color.BLACK);
        plot.setDomainGridlinePaint(Color.WHITE);
        plot.setRangeGridlinePaint(Color.WHITE);
        plot.setAxisOffset(new RectangleInsets(5.0, 5.0, 5.0, 5.0));
        plot.setDomainCrosshairVisible(true);
        plot.setRangeCrosshairVisible(true);
        
        XYItemRenderer r = plot.getRenderer();
      
        if (r instanceof XYLineAndShapeRenderer) {
              
            XYLineAndShapeRenderer renderer = (XYLineAndShapeRenderer) r;
                renderer.setBaseShapesVisible(true);

                renderer.setBaseShapesFilled(true);
                renderer.setBasePaint(Color.white);
                renderer.setSeriesPaint(0,Color.magenta);
        }
        
      dateAxis= (DateAxis)plot.getDomainAxis();
      
      DateTickUnit unit = null;
      unit = new DateTickUnit(DateTickUnitType.SECOND,30);
      
      DateFormat chartFormatter = new SimpleDateFormat("HH:mm:ss");
      dateAxis.setDateFormatOverride(chartFormatter);
      dateAxis.setTickUnit(unit);       
     
      NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
      rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
      rangeAxis.setRange(lastValue-4, lastValue+4);
      
        return result;
    }
    
    public void start(){
        timer.start();
    }
    
    
    public JPanel getChartPanel(){
         EventQueue.invokeLater(new Runnable() {
            public void run() {
                PrepareChart chart = new PrepareChart(); 
                System.out.println("In caht getter methoed");
                chart.start();
            }
        });
        
        return new ChartPanel(chart);
    }
     
}

getChartPanel methode will return the panel which i have to add in my main frame.

//My panel

public class ChartPanel extends JPanel{
    
    private Dimension dim;
    private PrepareChart chart;
    public JPanel jChart;
    private Timer timer;
    public ChartPanel(){
        dim = super.getToolkit().getScreenSize();
        this.setBounds(2,2,dim.width/4,dim.height/4);
        chart = new PrepareChart();
        jChart =chart.getChartPanel();
        
               
        this.add(jChart);
    }
}

This panel will be added to a Jframe.

but the graph is not moving. it is constantly displaying an image.

[Ranganathan Kaliyur Mannar]

mallikarjun dontamsetti wrote:but the graph is not moving. it is constantly displaying an image.

what do you mean by graph not moving? by image do you mean the chart being generated?
As far as I know, JFreeChart will generate the image and you can show that in your app. It doesn't support animation. If you need charts with animation, you should look at JavaFX charts.

[mallikarjun dontamsetti]

it is a timeseries chart based on time it has to display values

[Ranganathan Kaliyur Mannar]

ok fine, so what is the 'image' you are getting? I mean what is in the image?

[mallikarjun dontamsetti]

A graph which is not moving(not moving based on time) a static image.

[Ranganathan Kaliyur Mannar]

You will have to provide a SSCCE to move further. Also, mention the JFreeChart version...

Edit: Ok, now I see what you are saying - the code has a timer which moves the time...this is something I am not aware of...

[mallikarjun dontamsetti]

it is working fine when i do this

public void run() {  
                PrepareChart chart = new PrepareChart();   
                System.out.println("In caht getter methoed");  
                chart.start();  
            }  

but my graph is showing a line in front how to remove it.