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JFreeChart: Time Series Chart

Posted on 2011-09-26
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Last Modified: 2012-05-12
In my TimeSeries chart, I want to display text just above or next to a data point.

If possible, please provide some sample code. Thanks!
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Comment
Question by:dshrenik
  • 4
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7 Comments
 
LVL 47

Expert Comment

by:for_yan
ID: 36642037
there is ItemLabelGeneartor - check here:

http://stackoverflow.com/questions/3146823/is-it-possible-to-add-legend-to-the-plot-in-jfreechart

and in the chapter 12 of the manual.
It can be done on the BarChart, but
I'm not sure it can be done within the LineChart - I don't think I saw any picture of it

0
 

Author Comment

by:dshrenik
ID: 36714321
This example shows how it can be done. But, I want specific labels for each data point. Please let me know how I can do that. Thanks!

https://sites.google.com/site/drjohnbmatthews/jfreechartdemo
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LVL 47

Expert Comment

by:for_yan
ID: 36714394
Look, how I modified it:

import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Stroke;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.NumberFormat;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
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.TickUnitSource;
import org.jfree.chart.labels.StandardXYItemLabelGenerator;
import org.jfree.chart.labels.XYItemLabelGenerator;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.xy.DefaultXYDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.RefineryUtilities;

/**
 * @author John B. Matthews
 */
public class JFreeChartDemo extends JFrame {

    private static final int MAX = 8;
    private static final Random random = new Random();

    /**
     * Construct a new frame
     *
     * @param title the frame title
     */
    public JFreeChartDemo(String title) {
        super(title);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        final DefaultXYDataset dataset = new DefaultXYDataset();
        dataset.addSeries("Series0", createSeries(0));
        dataset.addSeries("Series1", createSeries(1));
        JFreeChart chart = createChart(dataset);
        ChartPanel chartPanel = new ChartPanel(chart, false);
        chartPanel.setPreferredSize(new Dimension(640, 480));
        this.add(chartPanel, BorderLayout.CENTER);

        JPanel buttonPanel = new JPanel();
        JButton addButton = new JButton("Add Series");
        buttonPanel.add(addButton);
        addButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int n = dataset.getSeriesCount();
                dataset.addSeries("Series" + n, createSeries(n));
            }
        });
        JButton remButton = new JButton("Remove Series");
        buttonPanel.add(remButton);
        remButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int n = dataset.getSeriesCount() - 1;
                dataset.removeSeries("Series" + n);
            }
        });
        this.add(buttonPanel, BorderLayout.SOUTH);
    }

    /**
     * Create a series
     *
     * @ return the series
     */
    private double[][] createSeries(int mean) {
        double[][] series = new double[2][MAX];
        for (int i = 0; i < MAX; i++) {
            series[0][i] = (double) i;
            series[1][i] = mean + random.nextGaussian() / 2;

        }
        return series;
    }

    /**
     * Create a chart.
     *
     * @param dataset the dataset
     * @return the chart
     */
    private JFreeChart createChart(XYDataset dataset) {

        // create the chart...
        JFreeChart chart = ChartFactory.createXYLineChart(
            "Serial Data", // chart title
            "Domain", // domain axis label
            "Range", // range axis label
            dataset,  // initial series
            PlotOrientation.VERTICAL, // orientation
            true, // include legend
            true, // tooltips?
            false // URLs?
            );

        // set chart background
        chart.setBackgroundPaint(Color.white);

        // set a few custom plot features
        XYPlot plot = (XYPlot) chart.getPlot();
        plot.setBackgroundPaint(new Color(0xffffe0));
        plot.setDomainGridlinesVisible(true);
        plot.setDomainGridlinePaint(Color.lightGray);
        plot.setRangeGridlinePaint(Color.lightGray);

        // set the plot's axes to display integers
        TickUnitSource ticks = NumberAxis.createIntegerTickUnits();
        NumberAxis domain = (NumberAxis) plot.getDomainAxis();
        domain.setStandardTickUnits(ticks);
        NumberAxis range = (NumberAxis) plot.getRangeAxis();
        range.setStandardTickUnits(ticks);

        // render shapes and lines
        XYLineAndShapeRenderer renderer =
            new XYLineAndShapeRenderer(true, true);
        plot.setRenderer(renderer);
        renderer.setBaseShapesVisible(true);
        renderer.setBaseShapesFilled(true);

        // set the renderer's stroke
        Stroke stroke = new BasicStroke(
            3f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL);
        renderer.setBaseOutlineStroke(stroke);

        // label the points
        NumberFormat format = NumberFormat.getNumberInstance();
        format.setMaximumFractionDigits(2);
              /*
        XYItemLabelGenerator generator =
            new StandardXYItemLabelGenerator(
                StandardXYItemLabelGenerator.DEFAULT_ITEM_LABEL_FORMAT,
                format, format);
        */
               XYItemLabelGenerator generator = new  MyItemLabelGenerator();

        renderer.setBaseItemLabelGenerator(generator);
        renderer.setBaseItemLabelsVisible(true);

        return chart;
    }

    /** Main method */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                JFreeChartDemo demo = new JFreeChartDemo("JFreeChartDemo");
                demo.pack();
                demo.setLocationRelativeTo(null);
                demo.setVisible(true);
            }
         });
    }
}
class MyItemLabelGenerator extends StandardXYItemLabelGenerator {

public String generateLabel (XYDataset dataset, int series, int item){
    if(series == 0 && item == 2)return "good dog";
    else  if(series == 1 && item == 3)return "bad cat";
    else return "("+ series + "," + item + ")";


}


}

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Author Comment

by:dshrenik
ID: 36714441
Thanks for the code.
But, I requirement is a little different. I extract the data points from an ArrayList of objects of a class Dummy. Dummy has 2 fields:
1. value -> data point on the graph
2. description -> description of the data point

I want to display the description in the label.

Thanks!



 
0
 
LVL 47

Accepted Solution

by:
for_yan earned 500 total points
ID: 36714460
But it is the same thing - use your ArrayList  return
description values in the genrateLabel() method.

I just used arraylust with two elements for two points - but you
of course should use it for all points.

And I also assume that you already extracted the values into the data
values into dataset - I shoed only how to show label.

 

import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Stroke;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
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.TickUnitSource;
import org.jfree.chart.labels.StandardXYItemLabelGenerator;
import org.jfree.chart.labels.XYItemLabelGenerator;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.xy.DefaultXYDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.RefineryUtilities;

/**
 * @author John B. Matthews
 */
public class JFreeChartDemo extends JFrame {

    private static final int MAX = 8;
    private static final Random random = new Random();

    /**
     * Construct a new frame
     *
     * @param title the frame title
     */
    public JFreeChartDemo(String title) {
        super(title);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        final DefaultXYDataset dataset = new DefaultXYDataset();
        dataset.addSeries("Series0", createSeries(0));
        dataset.addSeries("Series1", createSeries(1));
        JFreeChart chart = createChart(dataset);
        ChartPanel chartPanel = new ChartPanel(chart, false);
        chartPanel.setPreferredSize(new Dimension(640, 480));
        this.add(chartPanel, BorderLayout.CENTER);

        JPanel buttonPanel = new JPanel();
        JButton addButton = new JButton("Add Series");
        buttonPanel.add(addButton);
        addButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int n = dataset.getSeriesCount();
                dataset.addSeries("Series" + n, createSeries(n));
            }
        });
        JButton remButton = new JButton("Remove Series");
        buttonPanel.add(remButton);
        remButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int n = dataset.getSeriesCount() - 1;
                dataset.removeSeries("Series" + n);
            }
        });
        this.add(buttonPanel, BorderLayout.SOUTH);
    }

    /**
     * Create a series
     *
     * @ return the series
     */
    private double[][] createSeries(int mean) {
        double[][] series = new double[2][MAX];
        for (int i = 0; i < MAX; i++) {
            series[0][i] = (double) i;
            series[1][i] = mean + random.nextGaussian() / 2;

        }
        return series;
    }

    /**
     * Create a chart.
     *
     * @param dataset the dataset
     * @return the chart
     */
    private JFreeChart createChart(XYDataset dataset) {

        // create the chart...
        JFreeChart chart = ChartFactory.createXYLineChart(
            "Serial Data", // chart title
            "Domain", // domain axis label
            "Range", // range axis label
            dataset,  // initial series
            PlotOrientation.VERTICAL, // orientation
            true, // include legend
            true, // tooltips?
            false // URLs?
            );

        // set chart background
        chart.setBackgroundPaint(Color.white);

        // set a few custom plot features
        XYPlot plot = (XYPlot) chart.getPlot();
        plot.setBackgroundPaint(new Color(0xffffe0));
        plot.setDomainGridlinesVisible(true);
        plot.setDomainGridlinePaint(Color.lightGray);
        plot.setRangeGridlinePaint(Color.lightGray);

        // set the plot's axes to display integers
        TickUnitSource ticks = NumberAxis.createIntegerTickUnits();
        NumberAxis domain = (NumberAxis) plot.getDomainAxis();
        domain.setStandardTickUnits(ticks);
        NumberAxis range = (NumberAxis) plot.getRangeAxis();
        range.setStandardTickUnits(ticks);

        // render shapes and lines
        XYLineAndShapeRenderer renderer =
            new XYLineAndShapeRenderer(true, true);
        plot.setRenderer(renderer);
        renderer.setBaseShapesVisible(true);
        renderer.setBaseShapesFilled(true);

        // set the renderer's stroke
        Stroke stroke = new BasicStroke(
            3f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL);
        renderer.setBaseOutlineStroke(stroke);

        // label the points
        NumberFormat format = NumberFormat.getNumberInstance();
        format.setMaximumFractionDigits(2);
              /*
        XYItemLabelGenerator generator =
            new StandardXYItemLabelGenerator(
                StandardXYItemLabelGenerator.DEFAULT_ITEM_LABEL_FORMAT,
                format, format);
        */
        ArrayList<Dummy> dd = new ArrayList<Dummy>();
        dd.add(new Dummy("wild cat",5.0));
        dd.add(new Dummy("tame dog", 4.0));

               XYItemLabelGenerator generator = new  MyItemLabelGenerator(dd);

        renderer.setBaseItemLabelGenerator(generator);
        renderer.setBaseItemLabelsVisible(true);

        return chart;
    }

    /** Main method */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                JFreeChartDemo demo = new JFreeChartDemo("JFreeChartDemo");
                demo.pack();
                demo.setLocationRelativeTo(null);
                demo.setVisible(true);
            }
         });
    }
}
class MyItemLabelGenerator extends StandardXYItemLabelGenerator {

    ArrayList <Dummy> dd;
    public MyItemLabelGenerator(ArrayList dd){
        super();
      this.dd = dd;
    }

public String generateLabel (XYDataset dataset, int series, int item){

    if(series == 0 && item == 2)return dd.get(0).getDescription();
    else  if(series == 1 && item == 3)return dd.get(1).getDescription();
    else return "("+ series + "," + item + ")";


}


}

class Dummy {
    String description;
    double value;

    Dummy(String s, double v){
        description = s;
        value = v;
    }
    public String getDescription(){
        return description;
    }



}

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Author Comment

by:dshrenik
ID: 36714469
Awesome. Thanks!
0
 
LVL 47

Expert Comment

by:for_yan
ID: 36714487
You are always welcome.

On this particular chart it truncates the text to the left of the
first point, so you can add some spaces to the first label like in the code below.

Maybe it will not be an issue fior your chart - if you have
different location of origin and axes relative to the boundaries of the chart

import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Stroke;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
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.TickUnitSource;
import org.jfree.chart.labels.StandardXYItemLabelGenerator;
import org.jfree.chart.labels.XYItemLabelGenerator;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.xy.DefaultXYDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.RefineryUtilities;

/**
 * @author John B. Matthews
 */
public class JFreeChartDemo extends JFrame {

    private static final int MAX = 8;
    private static final Random random = new Random();

    /**
     * Construct a new frame
     *
     * @param title the frame title
     */
    public JFreeChartDemo(String title) {
        super(title);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        final DefaultXYDataset dataset = new DefaultXYDataset();
        dataset.addSeries("Series0", createSeries(0));
        dataset.addSeries("Series1", createSeries(1));
        JFreeChart chart = createChart(dataset);
        ChartPanel chartPanel = new ChartPanel(chart, false);
        chartPanel.setPreferredSize(new Dimension(640, 480));
        this.add(chartPanel, BorderLayout.CENTER);

        JPanel buttonPanel = new JPanel();
        JButton addButton = new JButton("Add Series");
        buttonPanel.add(addButton);
        addButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int n = dataset.getSeriesCount();
                dataset.addSeries("Series" + n, createSeries(n));
            }
        });
        JButton remButton = new JButton("Remove Series");
        buttonPanel.add(remButton);
        remButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int n = dataset.getSeriesCount() - 1;
                dataset.removeSeries("Series" + n);
            }
        });
        this.add(buttonPanel, BorderLayout.SOUTH);
    }

    /**
     * Create a series
     *
     * @ return the series
     */
    private double[][] createSeries(int mean) {
        double[][] series = new double[2][MAX];
        for (int i = 0; i < MAX; i++) {
            series[0][i] = (double) i;
            series[1][i] = mean + random.nextGaussian() / 2;

        }
        return series;
    }

    /**
     * Create a chart.
     *
     * @param dataset the dataset
     * @return the chart
     */
    private JFreeChart createChart(XYDataset dataset) {

        // create the chart...
        JFreeChart chart = ChartFactory.createXYLineChart(
            "Serial Data", // chart title
            "Domain", // domain axis label
            "Range", // range axis label
            dataset,  // initial series
            PlotOrientation.VERTICAL, // orientation
            true, // include legend
            true, // tooltips?
            false // URLs?
            );

        // set chart background
        chart.setBackgroundPaint(Color.white);

        // set a few custom plot features
        XYPlot plot = (XYPlot) chart.getPlot();
        plot.setBackgroundPaint(new Color(0xffffe0));
        plot.setDomainGridlinesVisible(true);
        plot.setDomainGridlinePaint(Color.lightGray);
        plot.setRangeGridlinePaint(Color.lightGray);

        // set the plot's axes to display integers
        TickUnitSource ticks = NumberAxis.createIntegerTickUnits();
        NumberAxis domain = (NumberAxis) plot.getDomainAxis();
        domain.setStandardTickUnits(ticks);
        NumberAxis range = (NumberAxis) plot.getRangeAxis();
        range.setStandardTickUnits(ticks);

        // render shapes and lines
        XYLineAndShapeRenderer renderer =
            new XYLineAndShapeRenderer(true, true);
        plot.setRenderer(renderer);
        renderer.setBaseShapesVisible(true);
        renderer.setBaseShapesFilled(true);

        // set the renderer's stroke
        Stroke stroke = new BasicStroke(
            3f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_BEVEL);
        renderer.setBaseOutlineStroke(stroke);

        // label the points
        NumberFormat format = NumberFormat.getNumberInstance();
        format.setMaximumFractionDigits(2);
              /*
        XYItemLabelGenerator generator =
            new StandardXYItemLabelGenerator(
                StandardXYItemLabelGenerator.DEFAULT_ITEM_LABEL_FORMAT,
                format, format);
        */
        ArrayList<Dummy> dd = new ArrayList<Dummy>();
        dd.add(new Dummy("wild cat",5.0));
        dd.add(new Dummy("tame dog", 4.0));
          dd.add(new Dummy("tiny lion", 6.0));

               XYItemLabelGenerator generator = new  MyItemLabelGenerator(dd);

        renderer.setBaseItemLabelGenerator(generator);
        renderer.setBaseItemLabelsVisible(true);

        return chart;
    }

    /** Main method */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                JFreeChartDemo demo = new JFreeChartDemo("JFreeChartDemo");
                demo.pack();
                demo.setLocationRelativeTo(null);
                demo.setVisible(true);
            }
         });
    }
}
class MyItemLabelGenerator extends StandardXYItemLabelGenerator {

    ArrayList <Dummy> dd;
    public MyItemLabelGenerator(ArrayList dd){
        super();
      this.dd = dd;
    }

public String generateLabel (XYDataset dataset, int series, int item){

   if(item == 0)return "           " + dd.get(item).getDescription();
   else if (item < 3) return dd.get(item).getDescription();
    else return "("+ series + "," + item + ")";


}


}

class Dummy {
    String description;
    double value;

    Dummy(String s, double v){
        description = s;
        value = v;
    }
    public String getDescription(){
        return description;
    }



}

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