将饼图分成相等的部分jfreechart

Question

I have a data source in which there are three departments and each department has equal employees that are 8. I want to make a pie chart using jFreeChart such that first we partition the pie into 3 equal parts for departments that is 120' for each department. Then in these partitions I want to show the sales of each employee. How can I do this in jFreeChart.

Answer 1

PieChartDemo1 is a good starting point; focus on createDataset() ; the full source is included in the distribution.

Addendum: How to further create partitions?

Ah, you want to sub-divide each 120° partition. DefaultPieDataset doesn't support a hierarchical structure directly, but you can use color in the PiePlot to highlight the grouping. Create related colors using Color.getHSBColor() , as shown here , and use setSectionPaint() to apply the colors accordingly.

Answer 2

public class PieChart extends JFrame {  

  private  PieDataset createDataset() {
            DefaultPieDataset result = new DefaultPieDataset();
            result.setValue("department1", 33.33);
            result.setValue("department2", 33.33);
            result.setValue("department3", 33.33);
            return result;

        }

     private JFreeChart createChart(PieDataset dataset, String title) {

            JFreeChart chart = ChartFactory.createPieChart3D(title,          // chart title
                dataset,                // data
                true,                   // include legend
                true,
                false);

            PiePlot3D plot = (PiePlot3D) chart.getPlot();
            plot.setStartAngle(290);
            plot.setDirection(Rotation.CLOCKWISE);
            plot.setForegroundAlpha(0.5f);
            return chart;

        }

}

public static void main(String[] args) {
          PieChart demo = new PieChart("Comparison", "Which operating system are you using?");
          demo.pack();
          demo.setVisible(true);
      }