PieChart class is a part of JavaFX. PieChart class is used to create a pie chart. The chart content is populated by pie slices based on data set on the PieChart.The layout of the pie chart is set to clockwise by default. PieChart inherits Chart class.
Constructor of the class are:
- PieChart(): Creates an empty instance of pie chart.
- PieChart(ObservableList data): Creates an instance of pie chart with given data.
Commonly Used Methods:
| Methods | Explanation |
|---|---|
| getData() | returns the data of the pie chart |
| getLabelLineLength() | returns the label length of the pie chart |
| getLabelsVisible() | Indicates whether pie slice labels are drawn or not |
| getStartAngle() | returns the start angle of the pie chart |
| isClockwise() | returns whether the pie chart is clockwise or not |
| setClockwise(boolean v) | sets the pie chart orientation to clockwise is true value is passed |
| setData(ObservableList data) | Sets the value of the property data. |
| setLabelLineLength(double v) | sets the label line length of pie chart . |
| setLabelsVisible(boolean v) | Sets the value of the property labelsVisible. |
| setStartAngle(double v) | sets the start angle of the pie chart |
Below programs will illustrate the use of the PieChart class:
- Java program to create a pie chart with some specified data: This program creates a PieChart. A PieChart.Data will be created that will be added to the pie chart as an observable list.T he PieChart will be created inside a scene, which in turn will be hosted inside a stage. The function setTitle() is used to provide title to the stage. Then a Group is created, and the pie chart is attached. The group is attached to the scene. Finally, the show() method is called to display the final results.
Java
// Java program to create a pie chart// with some specified dataimport javafx.application.Application;import javafx.scene.Scene;import javafx.scene.chart.PieChart;import javafx.scene.layout.*;import javafx.event.ActionEvent;import javafx.scene.AmbientLight;import javafx.scene.shape.Sphere;import javafx.scene.control.*;import javafx.stage.Stage;import javafx.scene.Group;import javafx.scene.PerspectiveCamera;import javafx.scene.paint.Color;import javafx.event.ActionEvent;import javafx.event.EventHandler;import javafx.collections.FXCollections; public class pie_chart_1 extends Application { // launch the application public void start(Stage stage) { // set title for the stage stage.setTitle("Creating Pie Chart"); // piechart data PieChart.Data data[] = new PieChart.Data[5]; // string and integer data String status[] = {"Correct Answer", "Wrong Answer", "Compilation Error", "Runtime Error", "Others" }; int values[] = {20, 30, 10, 4, 2}; for (int i = 0; i < 5; i++) { data[i] = new PieChart.Data(status[i], values[i]); } // create a pie chart PieChart pie_chart = new PieChart(FXCollections.observableArrayList(data)); // create a Group Group group = new Group(pie_chart); // create a scene Scene scene = new Scene(group, 500, 300); // set the scene stage.setScene(scene); stage.show(); } // Main Method public static void main(String args[]) { // launch the application launch(args); }} |
Output:
- Java program to create a pie chart with some specified data, with visible labels and a defined start angle, and ordered in anticlockwise direction: This program creates a PieChart. A PieChart.Data will be created that will be added to the pie chart as an observable list. The PieChart will be created inside a scene, which in turn will be hosted inside a stage. The function setTitle() is used to provide title to the stage. Then a Group is created, and the pie chart is attached. The group is attached to the scene. Finally, the show() method is called to display the final results.we will set label line length of pie chart using setLabelLineLength() function, we will set the start angle and the clockwise orientation using setStartAngle() and setClockwise() function respectively . we can make the labels visible using setLabelsVisible() function.
Java
// Java program to create a pie chart with// some specified data, with visible labels// and a defined start angle, and ordered// in anticlockwise directionimport javafx.application.Application;import javafx.scene.Scene;import javafx.scene.chart.PieChart;import javafx.scene.layout.*;import javafx.event.ActionEvent;import javafx.scene.AmbientLight;import javafx.scene.shape.Sphere;import javafx.scene.control.*;import javafx.stage.Stage;import javafx.scene.Group;import javafx.scene.PerspectiveCamera;import javafx.scene.paint.Color;import javafx.event.ActionEvent;import javafx.event.EventHandler;import javafx.collections.FXCollections; public class pie_chart_2 extends Application { // launch the application public void start(Stage stage) { // set title for the stage stage.setTitle("Creating Pie Chart"); // piechart data PieChart.Data data[] = new PieChart.Data[5]; // string and integer data String status[] = {"Correct Answer", "Wrong Answer", "Compilation Error", "Runtime Error", "Others"}; int values[] = {20, 30, 10, 4, 2}; for (int i = 0; i < 5; i++) { data[i] = new PieChart.Data(status[i], values[i]); } // create a pie chart PieChart pie_chart = new PieChart(FXCollections.observableArrayList(data)); // set line length of label pie_chart.setLabelLineLength(10.0f); // make labels visible pie_chart.setLabelsVisible(true); // set start angle pie_chart.setStartAngle(20.0f); // set anticlockwise pie_chart.setClockwise(false); // create a Group Group group = new Group(pie_chart); // create a scene Scene scene = new Scene(group, 500, 500); // set the scene stage.setScene(scene); stage.show(); } // Main Method public static void main(String args[]) { // launch the application launch(args); }} |
Output:
Note: The above programs might not run in an online IDE. Please use an offline compiler.
Reference: https://docs.oracle.com/javase/8/javafx/api/javafx/scene/chart/PieChart.html
