JavaFX PieChart Tutorial with Examples

JavaFX PieChart
PieChart example
Custom PieChart
PieChart and events

1. JavaFX PieChart

JavaFX PieChart describes a chart that represents data in a form of circle divided into triangular wedges called slices. Each slice represents a percentage that corresponds to a particular value.

GDP data for some countries in 2015:

Country	GDP (Million dollars)
USA	17.947.195
EU	11.540.278
China	10.982.829
Japan	4.116.242
Others	28.584.442

2. PieChart example

The example below is the PieChart describing GDP of some coutries in 2015.

PieChartDemo.java

package org.o7planning.javafx.piechart;

import javafx.application.Application;
import javafx.geometry.Side;
import javafx.scene.Scene;
import javafx.scene.chart.PieChart;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class PieChartDemo extends Application {

   @Override
   public void start(Stage primaryStage) throws Exception {

       PieChart pieChart = new PieChart();

       PieChart.Data slice1 = new PieChart.Data("USA", 17947195);
       PieChart.Data slice2 = new PieChart.Data("EU", 11540278);
       PieChart.Data slice3 = new PieChart.Data("China", 10982829);
       PieChart.Data slice4 = new PieChart.Data("Japan", 4116242);
       PieChart.Data slice5 = new PieChart.Data("Others", 28584442);

       pieChart.getData().add(slice1);
       pieChart.getData().add(slice2);
       pieChart.getData().add(slice3);
       pieChart.getData().add(slice4);
       pieChart.getData().add(slice5);
     
       pieChart.setLegendSide(Side.LEFT);

       primaryStage.setTitle("JavaFX PieChart (o7planning.org)");
       StackPane root = new StackPane(pieChart);

       Scene scene = new Scene(root, 400, 200);

       primaryStage.setScene(scene);

       primaryStage.show();
   }

   public static void main(String[] args) {
       Application.launch(args);
   }
}

3. Custom PieChart

By default PieChart to full display its components, including Labels, and Legend. You can set up the components to display or not display by setLabelsVisile, setLegendVisible methods.

pieChart.setLabelsVisile(false);
pieChart.setLegendVisible(false);

Set up the Lgend display position and and length of Label Line.

chart.setLabelLineLength(10);
chart.setLegendSide(Side.LEFT);

By default, the slices are set up according to clockwise direction. However, you also can set them up in reverse direction using setClockwise(false) method.

Along clockwise:

Counterclockwise:

You also can change the starting angle of PieChart via setStartAngle method.

pieChart.setStartAngle(30);

4. PieChart and events

Although a pie chart slice is not a Node object, each PieChart.Data element has a node associated with it, which can be used to analyze events and process them accordingly

PieChartEventDemo.java

package org.o7planning.javafx.piechart;

import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.geometry.Side;
import javafx.scene.Scene;
import javafx.scene.chart.PieChart;
import javafx.scene.control.Label;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.AnchorPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class PieChartEventDemo extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {

        PieChart pieChart = new PieChart();

        PieChart.Data slice1 = new PieChart.Data("USA", 17947195);
        PieChart.Data slice2 = new PieChart.Data("EU", 11540278);
        PieChart.Data slice3 = new PieChart.Data("China", 10982829);
        PieChart.Data slice4 = new PieChart.Data("Japan", 4116242);
        PieChart.Data slice5 = new PieChart.Data("Others", 28584442);

        pieChart.getData().add(slice1);
        pieChart.getData().add(slice2);
        pieChart.getData().add(slice3);
        pieChart.getData().add(slice4);
        pieChart.getData().add(slice5);
       
        pieChart.setPrefSize(400, 300);

        pieChart.setLegendSide(Side.LEFT);
        pieChart.setStartAngle(30);

        final Label caption = new Label("");
        caption.setTextFill(Color.WHITE);
        caption.setStyle("-fx-font: 12 arial;");

        for (final PieChart.Data data : pieChart.getData()) {
            data.getNode().addEventHandler(MouseEvent.MOUSE_PRESSED, new EventHandler<MouseEvent>() {
                @Override
                public void handle(MouseEvent e) {
                    caption.setTranslateX(e.getSceneX());
                    caption.setTranslateY(e.getSceneY());

                    caption.setText(String.valueOf(data.getPieValue()));
                }
            });
        }

        primaryStage.setTitle("JavaFX PieChart (o7planning.org)");
        AnchorPane root = new AnchorPane();
        root.getChildren().addAll(pieChart, caption);
       
       

        Scene scene = new Scene(root, 400, 300);

        primaryStage.setScene(scene);

        primaryStage.show();
    }

    public static void main(String[] args) {
        Application.launch(args);
    }
}