Create the Pie chart as Image in Java

Sometimes we need to create a Pie Chart in Java which we need to display either in result file of some operation or somewhere else.

We can create the Pie-Chart using jfree library which is freely available. Its simple, not a tricky task.

you can download the eclipse project as zip file. Click Here


Lets have a look on the code sample

import java.awt.Color;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.labels.StandardPieSectionLabelGenerator;
import org.jfree.chart.plot.PiePlot;
import org.jfree.data.general.DefaultPieDataset;


public class ToImage {

    // create a array for color to be used in program.
    private static Color colors[] = {new Color(92,151,70),new Color(255,140,0),
new Color(62,117,167),  new Color(196,50,79)};
   
    public static void main(String args[])   
    {
        // instance of PieChartDatabase   
        DefaultPieDataset dataset = new DefaultPieDataset();
       
        // added three values and name of the pie chart database, they will appear as Section of Piechart
        dataset.setValue("First", 2);
        dataset.setValue("Second", 4);
        dataset.setValue("Third", 3);
        dataset.setValue("Forth", 1);
       
        // create Pie chart with name Sections
        JFreeChart chart = ChartFactory.createPieChart("Sections", dataset, true, true, false);
       
       
        //below three lines to customize the property of Section's Label
        // now they will come in percentage. (first = 20%, second=40%)
        //otherwise simple values (first = 2, second=4)
        PiePlot pie = (PiePlot) chart.getPlot();       
        StandardPieSectionLabelGenerator labels = new StandardPieSectionLabelGenerator("{0} = {2}");
        pie.setLabelGenerator(labels);
       
        // this is to cut the "Second" second and display with gap in whole pie chart
        pie.setExplodePercent(1, 0.2);
       
               
        try {
            // to set the all 4 sections color
            pie.setSectionPaint(0, colors[0]);
            pie.setSectionPaint(1, colors[1]);
            pie.setSectionPaint(2, colors[2]);
            pie.setSectionPaint(3, colors[3]);
           
           
            //Create a png file chart.png
            OutputStream out = new FileOutputStream(new File("chart.png"));
           
            // now write the pie chart to blank png file create in prev. step
            ChartUtilities.writeChartAsPNG(out, chart, 300, 300);
           
            System.out.println("chart created..!!");
        }
        catch (Exception e)
        {       
            e.printStackTrace();
        }
    }
}

you required two jar file to download and add reference of them into your project. You can download these two interlinked jar file from here Jar1 and Jar2

This is the output of the above program.

 

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