JavaFX | Circle with examples

Circle class is a part of the JavaFX library. Circle class creates a circle with a specified x and y position for the center of the circle, the specified radius for the circle and a specified fill.
The radius and the center of the circles are measured in pixels.

Constructors of the class are:

1. Circle(): creates a empty instance of circle
2. Circle(double r): creates a circle with a specified radius
3. Circle(double X, double Y, double r): creates a circle with given X and y coordinates of the center of the circle, and the radius.
4. Circle(double r, paint f) creates a circle with a specified radius and fill
5. Circle(double X, double Y, double r, Paint f): creates a circle with given X and y coordinates of the center of the circle, and the radius and also a specified fill .

Commonly used methods:

Below programs illustrate the use of the Circle class:

1. Java program to create a circle by passing the coordinates of the center and radius as arguments in constructor: This program creates a Circle indicated by the name circle( the coordinates of the center and the radius is passed as arguments). The Circle 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 circle is attached. The group is attached to the scene. Finally, the show() method is called to display the final results.

   
   

   
   
   

   // Java program to create circle by passing the // coordinates of the center and radius // as arguments in constructor import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.layout.*; import javafx.event.ActionEvent; import javafx.scene.shape.Circle; import javafx.scene.control.*; import javafx.stage.Stage;    import javafx.scene.Group; public class circle_0 extends Application {        // launch the application     public void start(Stage stage)     {         // set title for the stage         stage.setTitle("creating circle");            // create a circle         Circle circle = new Circle(150.0f, 150.0f, 80.f);            // create a Group         Group group = new Group(circle);            // create a scene         Scene scene = new Scene(group, 500, 300);            // set the scene         stage.setScene(scene);            stage.show();     }        public static void main(String args[])     {         // launch the application         launch(args);     } }

   Output:
   

2. Java program to create a circle and using the functions setCenterX, setCenterY and setRadius to set the coordinates of center and radius: This program creates a Circle indicated by the name circle. The coordinates for the center and the radius of the circle is set using setCenterX(), setCenterY(), and setRadius function. The Circle 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 circle is attached. The group is attached to the scene. Finally, the show() method is called to display the final results.

   
   

   
   
   

   // Java program to create a circle and using  // the functions setCenterX, setCenterY and setRadius // to set the coordinates of center and radius import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.layout.*; import javafx.event.ActionEvent; import javafx.scene.shape.Circle; import javafx.scene.control.*; import javafx.stage.Stage;    import javafx.scene.Group; public class circle_1 extends Application {        // launch the application     public void start(Stage stage)     {         // set title for the stage         stage.setTitle("creating circle");            // create a circle         Circle circle = new Circle();            // set the position of center of the  circle         circle.setCenterX(100.0f);         circle.setCenterY(100.0f);            // set Radius of the circle         circle.setRadius(50.0f);            // create a Group         Group group = new Group(circle);            // create a scene         Scene scene = new Scene(group, 500, 300);            // set the scene         stage.setScene(scene);            stage.show();     }        public static void main(String args[])     {         // launch the application         launch(args);     } }

   Output:
   

3. Java program to create a circle with specified radius and coordinates of center and also specified fill: This program creates a Circle indicated by the name circle.The coordinates for the center and the radius of the circle is set using setCenterX(), setCenterY(), and setRadius function. .The function set Fill() is used to set the fill of the circle The Circle 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 circle is attached.The group is attached to the scene. Finally, the show() method is called to display the final results.

   
   

   
   
   

   // Java program to create a circle with specified // radius and coordinates of center and also specified fill import javafx.application.Application; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.layout.*; import javafx.scene.paint.Color; import javafx.scene.shape.Circle; import javafx.scene.control.*; import javafx.stage.Stage;    import javafx.scene.Group; public class circle_2 extends Application {        // launch the application     public void start(Stage stage)     {         // set title for the stage         stage.setTitle("creating circle");            // create a circle         Circle circle = new Circle();            // set the position of center of the  circle         circle.setCenterX(100.0f);         circle.setCenterY(100.0f);            // set Radius of the circle         circle.setRadius(50.0f);            // set the fill of the circle         circle.setFill(Color.BLUE);            // create a Group         Group group = new Group(circle);            // create a scene         Scene scene = new Scene(group, 500, 300);            // set the scene         stage.setScene(scene);            stage.show();     }        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/javafx/2/api/javafx/scene/shape/Circle.html