Direction Game The Alien Direction Game System Modify the AlienDirection program

Question

Direction Game

The Alien Direction Game System Modify the AlienDirection program in Listing 7.20 so that it displays 10 random numbers between 1 and 100 in random locations and as the alien moves, it eats the numbers and as the numbers are consumed, it shows the total. When a number is consumed, the consumed number disappears, while other numbers remain the same. When all the numbers are consumed, the game starts over.

My Code So far :

package alien;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class AlienDirection extends Application {
  
public final static int JUMP = 10;
  
private ImageView imageView;
@Override
public void start(Stage primaryStage)
{
Image alien = new Image("file:Small_alien.png");
  
imageView = new ImageView(alien);
imageView.setX(20);
imageView.setY(20);
  
Group root = new Group(imageView);

Scene scene = new Scene(root, 400, 200, Color.BLUE);
scene.setOnKeyPressed(this::processKeyPress);

primaryStage.setTitle("Alien Direction");
primaryStage.setScene(scene);
primaryStage.show();
}

public void processKeyPress(KeyEvent event)
{
switch (event.getCode())
{
case UP:
imageView.setY(imageView.getY() - JUMP);
break;
case DOWN:
imageView.setY(imageView.getY() + JUMP);
break;
case RIGHT:
imageView.setX(imageView.getX() + JUMP);
break;
case LEFT:
imageView.setX(imageView.getX() - JUMP);
break;
default:
break;
}
}
  
public static void main(String[] args) {
launch(args);
}
  
}

Explanation / Answer

keep the image name as "Small_alien.png".

keep the image available to program AlienDirection.java

import javafx.application.Application;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import java.util.Random;
import javax.swing.JOptionPane;
/**
*
* @author dhrgam
*/
public class AlienDirection extends Application {
  
    public final static int JUMP = 10;
    public final static int WIDTH = 400;
    public final static int HEIGHT = 200;
  
    private ImageView imageView;
    private Text text[];
    private Group root;
    @Override
    public void start(Stage primaryStage)
    {
       Image alien = new Image("Small_alien.png");
      
        imageView = new ImageView(alien);
        //imageView.setScaleX(0.5);
        //imageView.setScaleY(0.5);
        imageView.setX(20);
        imageView.setY(20);
      
        root = new Group(imageView);
       ObservableList list = root.getChildren();
       System.out.println("Initially List Size:"+list.size());
      
      
       int x;
       Random r = new Random();
       text = new Text[10];
      
       for(int i=0;i<10;i++){
           text[i] = new Text();

           //Setting font to the text
           text[i].setFont(new Font(15));
           text[i].setFill(Color.RED);
          
           //setting the position of the text
           x=10+r.nextInt(39)*10;
           //System.out.print(x+",");
           text[i].setX(x);
           x=10+r.nextInt(19)*10;
           //System.out.print(x+",");
           text[i].setY(x);        

           //Setting the text to be added.
           x=1+r.nextInt(100);
           //System.out.print(x+",");
           text[i].setText(""+x);

           //Setting the text object as a node to the group object
           list.add(text[i]);
       }
       System.out.println("After adding Text objects, ListSize:"+list.size());
       Scene scene = new Scene(root, WIDTH, HEIGHT, Color.BLACK);
       scene.setOnKeyPressed(this::processKeyPress);

       primaryStage.setTitle("Alien Direction");
       primaryStage.setScene(scene);
       primaryStage.show();
    }

//--------------------------------------------------------------------
    // Modifies the position of the image view when an arrow key is
    // pressed.
    //--------------------------------------------------------------------
    public void processKeyPress(KeyEvent event)
    {
        switch (event.getCode())
        {
            case UP:
                imageView.setY(imageView.getY() - JUMP);
                isConsumed();
                break;
            case DOWN:
                imageView.setY(imageView.getY() + JUMP);
                isConsumed();
                break;
            case RIGHT:
                imageView.setX(imageView.getX() + JUMP);
                isConsumed();
                break;
            case LEFT:
                imageView.setX(imageView.getX() - JUMP);
                isConsumed();
                break;
            default:
                break; // do nothing if it's not an arrow key
          
          
        }
    }
    public void isConsumed(){
       for(int i=0;i<10;i++){
           if(imageView.getX()==text[i].getX() && imageView.getY()==text[i].getY()){
               root.getChildren().remove(text[i]);
               System.out.println("consumed at:"+text[i].getX()+","+text[i].getY());
           }
       }
       //if all text objects are consumed(removed from list), then list size will become 1. means all numbers are consumed.
       if(root.getChildren().size()==1){
           JOptionPane.showMessageDialog(null,"Game Completed!!!","Result",JOptionPane.WARNING_MESSAGE);
       }
   }
    public static void main(String[] args) {
        launch(args);
    }
  
}

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