Pie Chart Using JAVAFX

In this example we are seeing how to develop Pie Chart application using technologies JavaFX.

A pie-chart is a representation of values as slices of a circle with different colors. These slices are labeled and the values corresponding to each slice is represented in the chart.

In JavaFX, a pie chart is represented by a class named PieChart. This class belongs to the package javafx.scene.chart.

This class has 5 properties which are as follows −

• clockwise − This is a Boolean Operator; on setting this operator true, the data slices in the pie charts will be arranged clockwise starting from the start angle of the pie chart.

• data − This represents an ObservableList object, which holds the data of the pie chart.

• labelLineLength − An integer operator representing the length of the lines connecting the labels and the slices of the pie chart.

• labelsVisible − This is a Boolean Operator; on setting this operator true, the labels for the pie charts will be drawn. By default, this operator is set to be true.

• startAngle − This is a double type operator, which represents the angle to start the first pie slice at.

PieChart.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.chart.PieChart?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.AnchorPane?>


<AnchorPane prefHeight="500.0" prefWidth="500.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/11.0.1" fx:controller="application.PieChartController">
   <children>
      <PieChart fx:id="pieChart" prefHeight="400.0" prefWidth="512.0" title="PIE CHART" />
      <Button layoutX="178.0" layoutY="436.0" mnemonicParsing="false" onAction="#generateChart" prefHeight="44.0" prefWidth="157.0" text="LoadChart" />
   </children>
</AnchorPane>

PieChartController.java

package application;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.chart.PieChart;
import javafx.scene.chart.PieChart.Data;

public class PieChartController {
	
	@FXML
	PieChart pieChart;
	
	public void generateChart(ActionEvent ae){
		ObservableList<Data> list=FXCollections.observableArrayList(
				new PieChart.Data("Java",50),
				new PieChart.Data("C",30),
				new PieChart.Data("C++",25),
				new PieChart.Data("Python",40)
				);
		pieChart.setData(list);
	}
}

Main.java

package application;
	
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.stage.Stage;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;


public class Main extends Application {
	@Override
	public void start(Stage primaryStage) {
		try {
			Parent root=FXMLLoader.load(getClass().getResource("/application/PieChart.fxml"));
			Scene scene = new Scene(root);
			scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
			primaryStage.setScene(scene);
			primaryStage.show();
		} catch(Exception e) {
			e.printStackTrace();
		}
	}
	
	public static void main(String[] args) {
		launch(args);
	}
}