Question

Write a JavaFX application that draws 5 squares. Use a random number generator to generate random values for the size, x, and y. Make the size between 100 and 200, x between 0 and 600, y between 0 and 400. You can pick any color, but you must use different colors for the 5 squares. Set your window to 600 by 400.

Answer 1

Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

// DrawSquares.java

import java.util.Random;

import javafx.application.Application;

import static javafx.application.Application.launch;

import javafx.scene.Group;

import javafx.scene.Scene;

import javafx.scene.paint.Color;

import javafx.scene.shape.Rectangle;

import javafx.stage.Stage;

public class DrawSquares extends Application {

    //declaring needed measurements

    private static int WIDTH = 600, HEIGHT = 400, NUM_SQUARES = 5, SIZE_MIN = 100, SIZE_MAX = 200;

    @Override

    public void start(Stage primaryStage) {

        //creating a Group

        Group root = new Group();

        //creating a Random number generator

        Random random = new Random();

        //looping for NUM_SQUARES number of times

        for (int i = 0; i < NUM_SQUARES; i++) {

            //generating a random size between SIZE_MIN and SIZE_MAX

            int size = random.nextInt(SIZE_MAX - SIZE_MIN + 1) + SIZE_MIN;

            //creating a square at random x,y point and with size

            Rectangle sq = new Rectangle(random.nextInt(WIDTH), random.nextInt(HEIGHT), size, size);

            //generating a random color, here the first three values are r,g,b values between 0.0 and 1.0,

            //last value 1 is the alpha value (transparency)

            sq.setFill(new Color(random.nextDouble(), random.nextDouble(), random.nextDouble(), 1));

            //adding sq to root

            root.getChildren().add(sq);

        }

        //setting up a Scene and displaying it

        Scene scene = new Scene(root, WIDTH, HEIGHT);

        primaryStage.setScene(scene);

        primaryStage.setTitle("Squares");

        primaryStage.show();

    }

    public static void main(String[] args) {

        launch(args);

    }

}

/*OUTPUT*/