JavaFX | Rectangle and Rounded Rectangle with examples

Rectangle class is a part of JavaFX. Rectangle class creates a rectangle with specified width and height and position. 
By default Rectangle has sharp corners but the edges can be rounded by applying a arc height and width. 

Constructor :

1. Rectangle(): creates a empty instance of rectangle
2. Rectangle(double w, double h): creates a rectangle with a specified width and height
3. Rectangle(double x, double y, double w, double h): creates a rectangle with a specified width and height and position
4. Rectangle(double w, double h, Paint f): creates a rectangle with a specified width and height and fill

Commonly used methods

method	explanation
getArcHeight()	returns the arc height of the rectangle
getArcWidth()	returns the arc width of the rectangle
getHeight()	returns the height of the rectangle
getWidth()	returns the width of the rectangle
getX()	Gets the value of the property x.
getY()	Gets the value of the property y.
setArcHeight(double v)	sets the arc height of the rectangle
setArcWidth(double v)	sets the arc width of the rectangle
setHeight(double value)	sets the height of the rectangle
setWidth(double value)	sets the width of rectangle
setX(double value)	set the x coordinate of position of rectangle
setY(double value)	set the y coordinate of position of rectangle

Sample program to illustrate the use of Rectangle class

This program creates a Rectangle indicated by the name rectangle( the coordinates of the position and the height and width is passed as arguments). The Rectangle 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. 

Program to create a rectangle and add it to the scene

Java

// Java Program to create a rectangle and add it to the scene
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.Rectangle;
import javafx.scene.control.*;
import javafx.stage.Stage;

import javafx.scene.Group;
public class Rectangle_0 extends Application {

    // launch the application
    public void start(Stage stage)
    {
        // set title for the stage
        stage.setTitle("creating Rectangle");

        // create a rectangle
        Rectangle rectangle = new Rectangle(100.0d, 100.0d, 120.0d, 80.0d);

        // create a Group
        Group group = new Group(rectangle);

        // 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

Program to create a rounded rectangle and set a fill and add it to the scene

This program creates a Rectangle indicated by the name rectangle( the coordinates of the position and the height and width is passed as arguments). The rounded corners will be set using setArcHeight() and setArcWidth() function .The fill for the rectangle will be set using setFill() function. The Rectangle 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

// Java Program to create a rounded rectangle
// and set a fill and add it to the scene
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.Rectangle;
import javafx.scene.control.*;
import javafx.stage.Stage;

import javafx.scene.Group;
public class Rectangle_1 extends Application {

    // launch the application
    public void start(Stage stage)
    {
        // set title for the stage
        stage.setTitle("creating Rectangle");

        // create a rectangle
        Rectangle rectangle = new Rectangle(100.0d, 100.0d, 120.0d, 80.0d);

        // set fill for rectangle
        rectangle.setFill(Color.BLUE);

        // set rounded corners
        rectangle.setArcHeight(10.0d);
        rectangle.setArcWidth(10.0d);

        // create a Group
        Group group = new Group(rectangle);

        // 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 following programs might not run in an online IDE please use an offline compiler 

Reference:
https://docs.oracle.com/javase/8/javafx/api/javafx/scene/shape/Rectangle.html