JFreeChart Bubble Chart

by Online Tutorials Library July 14, 2022

JFreeChart- Bubble Chart

A bubble chart represents information in a three-dimensional manner. This chart is a variation of a scatter chart(XY chart) in which the data points are replaced by bubbles, and an additional dimension (z-values) of the data is represented in the size of the bubbles.

The following images show some of the demo versions of Bubble chart incorporated in JFreeChart library:

Bubble Chart Demo 1:

JFreeChart Bubble Chart Demo 1

Bubble Chart Demo 2:

JFreeChart Bubble Chart Demo 2

Bubble chart example:

Let us consider the following sample data for a bubble chart.

COUNTRY	Cars (in Million) X-Value	Buses (in Million) Y-Value	Trucks (in Million) Z-Value
India	40	65	70
U.S.A	30	20	50
China	80	50	80
Japan	11	50	20

The following codes create a Bubble chart from the above sample data:

BubbleChartExample.java

  import java.text.DecimalFormat;  import javax.swing.JFrame;  import javax.swing.SwingUtilities;  import javax.swing.WindowConstants;  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.labels.BubbleXYItemLabelGenerator;  import org.jfree.chart.plot.XYPlot;  import org.jfree.chart.renderer.xy.XYBubbleRenderer;  import org.jfree.data.xy.DefaultXYZDataset;  import org.jfree.data.xy.XYZDataset;    public class BubbleChartExample extends JFrame {      private static final long serialVersionUID = 1L;      public BubbleChartExample(String title) {      super(title);        // Create dataset      XYZDataset dataset = createDataset();        // Create chart      JFreeChart chart = ChartFactory.createBubbleChart(          “Country(Cars, Buses, Trucks)”,           “X-Values”,           “Y-Values”, dataset);              // Set range for X-Axis      XYPlot plot = chart.getXYPlot();      NumberAxis domain = (NumberAxis) plot.getDomainAxis();      domain.setRange(0, 100);        // Set range for Y-Axis      NumberAxis range = (NumberAxis) plot.getRangeAxis();      range.setRange(0, 100);            //Format label      XYBubbleRenderer renderer=(XYBubbleRenderer)plot.getRenderer();      BubbleXYItemLabelGenerator generator=new BubbleXYItemLabelGenerator(          ” {0}:({1},{2},{3}) “,new DecimalFormat(“0”),          new DecimalFormat(“0”),          new DecimalFormat(“0”));      renderer.setBaseItemLabelGenerator(generator);      renderer.setBaseItemLabelsVisible(true);            // Create Panel      ChartPanel panel = new ChartPanel(chart);      setContentPane(panel);    }    private XYZDataset createDataset() {      DefaultXYZDataset dataset = new DefaultXYZDataset();        dataset.addSeries(“INDIA”, new double[][] {         { 40 }, // X-Value         { 65 }, // Y-Value         { 70 }  // Z-Value        });      dataset.addSeries(“USA”, new double[][] { { 30 }, { 20 }, { 50 } });      dataset.addSeries(“CHINA”, new double[][] { { 80 }, { 50 }, { 80 } });      dataset.addSeries(“JAPAN”, new double[][] { { 11 }, { 50 }, { 20 } });        return dataset;    }      public static void main(String[] args) {      SwingUtilities.invokeLater(() -> {        BubbleChartExample example = new BubbleChartExample(“Bubble Chart Example”);        example.setSize(800, 400);        example.setLocationRelativeTo(null);        example.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);        example.setVisible(true);      });    }  }  

Output:

JFreeChart bubble Chart output

Next TopicJfreeChart-TimeSeries Chart

JFreeChart Bubble Chart

JFreeChart- Bubble Chart

Bubble chart example:

BubbleChartExample.java

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