JavaFX PieChart

In general, Pie chart is a type of the graph or diagram in which the sectors of a circle are used to represent different proportions of the whole information. The angle of the arc of a sector varies according to the percentage of information represented by that sector.

In the following image,A pie-chart is shown whose sectors represents the amount of fruits a person is having in its basket.

In JavaFX, Pie Chart is represented by the class javafx.scene.chart.PieChrt. We need to instantiate this class in order to create pi-chart.

Properties

The properties of the class javafx.scene.chart.PieChart are described along with the setter methods in the following table.

Property	Description	Setter Methods
clockwise	It is a boolean type property. Its true value means that the slices get placed clockwise from the start angle.	setClockWise(Boolean value)
data	It is an observable List type property. It represents the data which is to be set in the pie chart. The class PieChart.Data is used to deal with the assignment of data to the slices of pie chart.	setData(PieChart.Data value)
labelLineLength	It is a double type property. It represents the length of the line from the outside of the pie to the slice labels.	setLabelLineLength(double value)
labelsVisible	It is a boolean type property. Its true value means that pie slice labels will be drawn.	setLabelsVisible(boolean value)
startAngle	It is a double type property. It represents the angle of the first pie slice.	setStartAngle(double value)

Constructors

There are the two constructors in the class.

public PieChart() : creates the new instance of an empty PieChart.
public PieChart(ObservableList data) : creates the new instance of a pie-chart with the specified data slices.

Example 1:

package application;
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Side;
import javafx.scene.Scene;
import javafx.scene.chart.PieChart;
import javafx.scene.chart.PieChart.Data;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
public class ChartTest extends Application{
public static void main(String[] args) {
	launch(args);
}

@Override
public void start(Stage primaryStage) throws Exception {
	// TODO Auto-generated method stub
	//Instantiating the pie-chart class 
	PieChart piechart = new PieChart();

//setting the data of the pie chart.
	piechart.setData(getChartData());
	
	//Creating Layout 
	StackPane root = new StackPane();

	//Adding pie-chart to the layout 
	root.getChildren().add(piechart);

	//configuring scene 
	Scene scene = new Scene(root,400,400);
	primaryStage.setScene(scene);
	primaryStage.setTitle("PieChart Example");
	primaryStage.show();
	
}
//creating getChartData method to set the chart data 
private ObservableList<Data> getChartData() {
    ObservableList<Data> list = FXCollections.observableArrayList();
    list.addAll(new PieChart.Data("Javatpoint", 90),
            new PieChart.Data("Others", 10));
    return list;
}
}

Example 2:

In the following Example, we have created a piechart which shows the popularities of all the computer programming languages.

package application;
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Side;
import javafx.scene.Scene;
import javafx.scene.chart.PieChart;
import javafx.scene.chart.PieChart.Data;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
public class ChartTest extends Application{
public static void main(String[] args) {
	launch(args);
}

@Override
public void start(Stage primaryStage) throws Exception {
	// TODO Auto-generated method stub
	//Instantiating PieChart class 
	PieChart piechart = new PieChart();

	//Setting pieChart data  
	piechart.setData(getChartData());
	piechart.setLegendSide(Side.LEFT);
	piechart.setTitle("Computer Language Popularities");
	piechart.setClockwise(false);
	
	//Creating layout 
	StackPane root = new StackPane();
	
	//Adding piechart to the layout 
	root.getChildren().add(piechart);
	
	//Configuring Scene and stage object 
	Scene scene = new Scene(root,800,600);
	primaryStage.setScene(scene);
	primaryStage.setTitle("PieChart Example");
	primaryStage.show();
	
}

//The method sets the data to the pie-chart.  
private ObservableList<Data> getChartData() {
    ObservableList<Data> list = FXCollections.observableArrayList();
    list.addAll(new PieChart.Data("JavaScript", 30.8),
    		new PieChart.Data("Ruby", 11.8),
    		new PieChart.Data("Java", 10.8),
    		new PieChart.Data("Python", 11.6),
    		new PieChart.Data("PHP", 7.2),
    		new PieChart.Data("Objective-C", 10.7),
    		new PieChart.Data("C", 5.2),
         	   	new PieChart.Data("C++", 4.3),
            		new PieChart.Data("Go",3.8),
            		new PieChart.Data("CSS", 3.8)
);
    return list;
}
}