Chapter 4.3, Problem 26STQ

Explanation of Solution

Loop that is used to draw identical circles:

//Loop from 0 through number of circles

for (int i = 1; i <= 6; i++)

{

    //Set the color to fill

    gc.setFill(Color.BLUE);

    //Draw oval

    gc.fillOval(x, y, DIAMETER, DIAMETER);

    //Set the color to fill

    gc.setFill(Color.BLACK);

    //Draw the stroke

    gc.strokeOval(x, y, DIAMETER, DIAMETER);

    //Update the value of x

    x += DIAMETER + GAP;

}

Explanation:

The above loop is used to create six identical circles. For each iteration,

• The color “BLUE” is set using “setFill ()” method.
• An oval is drawn using “fillOval ()” method.
• The color “BLACK” is set using “setFill ()” method.
• A stroke is drawn using “strokeOval ()” method.
• The value of “x” is updated.

Complete program:

The below program is used to create six identical circles using “JavaFX”.

//Import required packages

import javafx.application.Application;

import javafx.scene.canvas.Canvas;

import javafx.scene.Scene;

import javafx.scene.Group;

import javafx.stage.Stage;

import javafx.scene.canvas.GraphicsContext;

import javafx.scene.paint.Color;

//Define the main class that extends application class

public class SelfTest26 extends Application

{

    //Declare required constant variables

    //Set the gap

    public static final int GAP = 50;

    //Set the value of diameter

    public static final int DIAMETER = 50;

    //Set the value of X_CENTER

    public static final int X_CENTER = 100;

    //Set the value of U_CENTER

    public static final int Y_CENTER = 100;

    //Define the main method

    public static void main(String[] args)

    {

        //Launch the application

        launch(args);

    }

    //Override the start method

    @Override

public void start(Stage primaryStage) throws Exception

    {

        //Create a group

        Group g = new Group();

        //Create a scene

        Scene scene = new Scene(g);

        //Create a canvas

        Canvas c = new Canvas(800, 600);

        //Create an object for graphics context

        GraphicsContext gc = c...