How to use

setCircular

method

in

org.jfree.chart.plot.PiePlot

/**
 * A flag indicating whether the pie chart is circular, or stretched into
 * an elliptical shape.
 *
 * @param flag  the new value.
 *
 * @see #isCircular()
 */
public void setCircular(boolean flag) {
  setCircular(flag, true);
}

/**
 * A flag indicating whether the pie chart is circular, or stretched into
 * an elliptical shape.
 *
 * @param flag  the new value.
 *
 * @see #isCircular()
 */
public void setCircular(boolean flag) {
  setCircular(flag, true);
}

public void getPieChart() {
   DefaultPieDataset pieDataset = new DefaultPieDataset();
 pieDataset.setValue("JavaWorld", new Integer(75));
 pieDataset.setValue("Other", new Integer(25));
   JFreeChart chart = ChartFactory.createPieChart("Discounts Used by Category ", data, true, true, false);
   //chart.setBackgroundPaint(new Color(222, 222, 255));
     final PiePlot plot = (PiePlot) chart.getPlot();
     plot.setBackgroundPaint(Color.white);
     plot.setCircular(true);
   try {
     final ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
     final File file1 = new File(getServletContext().getRealPath(".") + "/images/charts/piechart.png");
     ChartUtilities.saveChartAsPNG(file1, chart, 600, 400, info);
   } catch (Exception e) {
     System.out.println(e);
   }
 }

plot.setCircular(true);

 JFreeChart chart = ChartFactory.createPieChart3D("World Polulation by Countries ", dataset, true, true, true);
      PiePlot plot = (PiePlot) chart.getPlot();

      plot.setPieIndex(0);

//          plot.setLabelFont(new Font("SansSerif", Font.NORMAL, 12));
      plot.setNoDataMessage("No data available");
      plot.setCircular(false);
      plot.setLabelLinksVisible(true);
//          plot.zoom(200);
//          plot.setStartAngle(180);
//          plot.setLabelBackgroundPaint(paint);
      plot.setLabelLinkMargin(0.01);
      return chart;

public JFreeChart createPieChart(String title, PieDataset dataset) {
  JFreeChart chart = ChartFactory.createPieChart(title, dataset, true, true, false);
  PiePlot plot = (PiePlot) chart.getPlot();
  plot.setCircular(true);
  plot.setDirection(Rotation.CLOCKWISE);
  plot.setNoDataMessage("No data to display");
  StandardPieSectionLabelGenerator labelGenerator = new StandardPieSectionLabelGenerator("{0} {1} ({2})");
  plot.setLabelGenerator(labelGenerator);
  plot.setInteriorGap(0.01);
  plot.setMaximumLabelWidth(0.32);
  Font font = new Font(chart.getLegend().getItemFont().getFamily(), Font.PLAIN, 12);
  plot.setLabelFont(font);
  plot.setLabelBackgroundPaint(new Color(220, 220, 220));
  font = new Font(chart.getLegend().getItemFont().getFamily(), Font.PLAIN, 12);
  chart.getLegend().setItemFont(font);
  return chart;
}

piePlot.setCircular(true);
piePlot.setLabelGenerator(null);
piePlot.setShadowXOffset(0);

plot.setBackgroundPaint(Color.WHITE);
plot.setOutlinePaint(Color.WHITE);
plot.setCircular(true);
plot.setDirection(Rotation.CLOCKWISE);
plot.setIgnoreNullValues(true);

plot.setBackgroundPaint(ChartDefaults.transparent);
plot.setOutlinePaint(ChartDefaults.transparent);
plot.setCircular(true);
plot.setDirection(Rotation.CLOCKWISE);
plot.setIgnoreNullValues(true);

plot.setCircular(true);

((PiePlot) plot).setCircular(true);
((PiePlot) plot).setLabelGenerator(null);
((PiePlot) plot).setShadowXOffset(0);

piePlot.setCircular(isCircular);

pieplot.setCircular(circular);