- JavaFX Tutorial
- JavaFX - Home
- JavaFX - Overview
- JavaFX Installation and Architecture
- JavaFX - Environment
- JavaFX - Installation Using Netbeans
- JavaFX - Installation Using Eclipse
- JavaFX - Installation using Visual Studio Code
- JavaFX - Architecture
- JavaFX - Application
- JavaFX 2D Shapes
- JavaFX - 2D Shapes
- JavaFX - Drawing a Line
- JavaFX - Drawing a Rectangle
- JavaFX - Drawing a Rounded Rectangle
- JavaFX - Drawing a Circle
- JavaFX - Drawing an Ellipse
- JavaFX - Drawing a Polygon
- JavaFX - Drawing a Polyline
- JavaFX - Drawing a Cubic Curve
- JavaFX - Drawing a Quad Curve
- JavaFX - Drawing an Arc
- JavaFX - Drawing an SVGPath
- JavaFX Properties of 2D Objects
- JavaFX - Stroke Type Property
- JavaFX - Stroke Width Property
- JavaFX - Stroke Fill Property
- JavaFX - Stroke Property
- JavaFX - Stroke Line Join Property
- JavaFX - Stroke Miter Limit Property
- JavaFX - Stroke Line Cap Property
- JavaFX - Smooth Property
- Operations on 2D Objects
- JavaFX - 2D Shapes Operations
- JavaFX - Union Operation
- JavaFX - Intersection Operation
- JavaFX - Subtraction Operation
- JavaFX Path Objects
- JavaFX - Path Objects
- JavaFX - LineTo Path Object
- JavaFX - HLineTo Path Object
- JavaFX - VLineTo Path Object
- JavaFX - QuadCurveTo Path Object
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- JavaFX - ArcTo Path Object
- JavaFX Color and Texture
- JavaFX - Colors
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- JavaFX Effects
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- JavaFX - Color Adjust Effect
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- JavaFX - Box Blur Effect
- JavaFX - GaussianBlur Effect
- JavaFX - MotionBlur Effect
- JavaFX - Reflection Effect
- JavaFX - SepiaTone Effect
- JavaFX - Shadow Effect
- JavaFX - DropShadow Effect
- JavaFX - InnerShadow Effect
- JavaFX - Lighting Effect
- JavaFX - Light.Distant Effect
- JavaFX - Light.Spot Effect
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- JavaFX - DisplacementMap
- JavaFX - PerspectiveTransform
- JavaFX Transformations
- JavaFX - Transformations
- JavaFX - Rotation Transformation
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- JavaFX - Animations
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- JavaFX - Pause Transition
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- JavaFX Images
- JavaFX - Images
- JavaFX 3D Shapes
- JavaFX - 3D Shapes
- JavaFX - Creating a Box
- JavaFX - Creating a Cylinder
- JavaFX - Creating a Sphere
- Properties of 3D Objects
- JavaFX - Cull Face Property
- JavaFX - Drawing Modes Property
- JavaFX - Material Property
- JavaFX Event Handling
- JavaFX - Event Handling
- JavaFX - Using Convenience Methods
- JavaFX - Event Filters
- JavaFX - Event Handlers
- JavaFX UI Controls
- JavaFX - UI Controls
- JavaFX - ListView
- JavaFX - Accordion
- JavaFX - ButtonBar
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- JavaFX - HTMLEditor
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- JavaFX - Pagination
- JavaFX - ProgressIndicator
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- JavaFX - Separator
- JavaFX - Slider
- JavaFX - Spinner
- JavaFX - SplitPane
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- JavaFX - Label
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- JavaFX - TextArea
- JavaFX Charts
- JavaFX - Charts
- JavaFX - Creating Pie Chart
- JavaFX - Creating Line Chart
- JavaFX - Creating Area Chart
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- JavaFX - Creating Bubble Chart
- JavaFX - Creating Scatter Chart
- JavaFX - Creating Stacked Area Chart
- JavaFX - Creating Stacked Bar Chart
- JavaFX Layout Panes
- JavaFX - Layout Panes
- JavaFX - HBox Layout
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- JavaFX - BorderPane Layout
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- JavaFX - TextFlow Layout
- JavaFX - AnchorPane Layout
- JavaFX - TilePane Layout
- JavaFX - GridPane Layout
- JavaFX - FlowPane Layout
- JavaFX CSS
- JavaFX - CSS
- Media with JavaFX
- JavaFX - Playing Video
- JavaFX Useful Resources
- JavaFX - Quick Guide
- JavaFX - Useful Resources
- JavaFX - Discussion
JavaFX - 2D Shapes Circle
A circle is the locus of all points at a fixed distance (radius of circle) from a fixed point (the centre of circle). In other words, a circle is a line forming a closed loop, every point on which is a fixed distance from a centre point.
A circle is defined by two parameters namely −
Centre − It is a point inside the circle. All points on the circle are equidistant (same distance) from the centre point.
Radius − The radius is the distance from the centre to any point on the circle. It is half the diameter.
In JavaFX, a circle is represented by a class named Circle. This class belongs to the package javafx.scene.shape.
By instantiating this class, you can create a Circle node in JavaFX.
This class has 3 properties of the double datatype namely −
centerX − The x coordinate of the center of a circle.
centerY − The y coordinate of the center of a circle.
radius − The radius of the circle in pixels.
To draw a circle, you need to pass values to these properties, either by passing them to the constructor of this class, in the same order, at the time of instantiation, as follows −
Circle circle = new Circle(centerx, centery, radius);
Or, by using their respective setter methods as follows −
setCenterX(value); setCenterY(value); setRadius(value);
Steps to Draw a Circle
Follow the steps given below to draw a Circle in JavaFX.
Step 1: Creating a Class
Create a Java class and inherit the Application class of the package javafx.application and implement the start() method of this class as follows.
public class ClassName extends Application { @Override public void start(Stage primaryStage) throws Exception { } }
Step 2: Creating a Circle
You can create a circle in JavaFX by instantiating the class named Circle which belongs to a package javafx.scene.shape, instantiate this class as follows.
//Creating a circle object Circle circle = new Circle();
Step 3: Setting Properties to the Circle
Specify the x, y coordinates of the center of the circle and the radius of the circle by setting the properties X, Y, and radius using their respective setter methods as shown in the following code block.
circle.setCenterX(300.0f); circle.setCenterY(135.0f); circle.setRadius(100.0f);
Step 4: Creating a Group Object
In the start() method, create a group object by instantiating the class named Group, which belongs to the package javafx.scene.
Pass the circle (node) object, created in the previous step, as a parameter to the constructor of the Group class, in order to add it to the group as follows −
Group root = new Group(circle);
Step 5: Creating a Scene Object
Create a Scene by instantiating the class named Scene which belongs to the package javafx.scene. To this class, pass the Group object (root), created in the previous step.
In addition to the root object, you can also pass two double parameters representing height and width of the screen along with the object of the Group class as follows.
Scene scene = new Scene(group ,600, 300);
Step 6: Setting the Title of the Stage
You can set the title to the stage using the setTitle() method of the Stage class. The primaryStage is a Stage object which is passed to the start method of the scene class, as a parameter.
Using the primaryStage object, set the title of the scene as Sample Application as follows.
primaryStage.setTitle("Sample Application");
Step 7: Adding Scene to the Stage
You can add a Scene object to the stage using the method setScene() of the class named Stage. Add the Scene object prepared in the previous steps using this method as follows.
primaryStage.setScene(scene);
Step 8: Displaying the Contents of the Stage
Display the contents of the scene using the method named show() of the Stage class as follows.
primaryStage.show();
Step 9: Launching the Application
Launch the JavaFX application by calling the static method launch() of the Application class from the main method as follows.
public static void main(String args[]){ launch(args); }
Example
Following is a program which generates a circle using JavaFX. Save this code in a file with the name CircleExample.java.
import javafx.application.Application; import javafx.scene.Group; import javafx.scene.Scene; import javafx.stage.Stage; import javafx.scene.shape.Circle; public class CircleExample extends Application { @Override public void start(Stage stage) { //Drawing a Circle Circle circle = new Circle(); //Setting the properties of the circle circle.setCenterX(300.0f); circle.setCenterY(135.0f); circle.setRadius(100.0f); //Creating a Group object Group root = new Group(circle); //Creating a scene object Scene scene = new Scene(root, 600, 300); //Setting title to the Stage stage.setTitle("Drawing a Circle"); //Adding scene to the stage stage.setScene(scene); //Displaying the contents of the stage stage.show(); } public static void main(String args[]){ launch(args); } }
Compile and execute the saved java file from the command prompt using the following commands.
javac CircleExample.java java CircleExample
On executing, the above program generates a javaFx window displaying a circle as shown below.
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