Question

JavaFX programming (Not Javascript)

Using the code from BallPane.java and BounceBallControl.java

create a "Pong for One" game -

a rectangular paddle moves back and forth via mouse drag along the bottom of the pane;

the bottom of the paddle should be about 1/2 the diameter of the ball off the bottom.

If the ball connects with the paddle, then it bounces at a 90 degree angle back into the pane space.

If the ball misses the paddle, then the score is decremented by 1.

The game ends when 20 points are lost.

Nice things:

A label that displays the score (you can start at 20 and go to zero if you want...)

For every 10 paddle connections in a row, the ball moves faster

For every 10 paddle connections in a row, the ball changes color

For every (2?) paddle misses in a row, the paddle grows in length

There is MATH involved in figuring out the connection between the paddle and the ball.

You probably want to pay a lot of attention to how moveBall() works.

JavaFX programming (Not Javascript)

JavaFX programming (Not Javascript)

JavaFX programming (Not Javascript)

JavaFX programming (Not Javascript)

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BallPane.java

import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.beans.property.DoubleProperty; 4 import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.util.Duration;

public class BallPane extends Pane {

public final double radius = 20;

private double x = radius, y = radius;

private double dx = 1, dy = 1;

private Circle circle = new Circle(x, y, radius);

private Timeline animation;

public BallPane() {

circle.setFill(Color.GREEN); // Set ball color

getChildren().add(circle); // Place a ball into this pane

animation = new Timeline(

new KeyFrame(Duration.millis(50), e -> moveBall()));

animation.setCycleCount(Timeline.INDEFINITE);

animation.play(); // Start animation

}
public void play(){

animation.play();

}

public void pause() {

animation.pause();

}

public void increaseSpeed() {

animation.setRate(animation.getRate() + 0.1);

}

public void decreaseSpeed() {

animation.setRate(

animation.getRate() > 0 ? animation.getRate() - 0.1 : 0);

}

public DoubleProperty rateProperty() {

return animation.rateProperty();

}

protected void moveBall() {

if (x < radius || x > getWidth() - radius) {

dx *= -1;}

if (y < radius || y > getHeight() - radius) {

dy *= -1; }

x += dx;

y += dy;

circle.setCenterX(x);

circle.setCenterY(y);

} }

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BounceBallControl.java

import javafx.application.Application;

import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.input.KeyCode;

public class BounceBallControl extends Application {

@Override 

public void start(Stage primaryStage) {

BallPane ballPane = new BallPane(); // Create a ball pane

ballPane.setOnMousePressed(e -> ballPane.pause());

ballPane.setOnMouseReleased(e -> ballPane.play());

ballPane.setOnKeyPressed(e -> {

if (e.getCode() == KeyCode.UP) {

ballPane.increaseSpeed();

}

else if (e.getCode() == KeyCode.DOWN) {

ballPane.decreaseSpeed();

}

});

Scene scene = new Scene(ballPane, 250, 150);

primaryStage.setTitle("BounceBallControl"); // Set the stage title

primaryStage.setScene(scene); // Place the scene in the stage

primaryStage.show(); // Display the stage

ballPane.requestFocus();

}

}

Answer 1

I think the code you using not clearly explains me , the following code works well for ping pong game.

import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import javax.swing.ImageIcon;
import javax.swing.JApplet;
import java.applet.*;
import java.awt.*;
 
 
 
public class GAME extends  Applet implements Runnable  ,MouseMotionListener,MouseListener {
     
    private final int UP = 38;
    private final int DOWN = 40;
    private Player myPlayer;
    private Computer myComp;
    private Ball myBall;
    private Image  dbImage;
    private Image GameName;
    private AudioClip kicknoise;
    private Graphics dbg;
    private Thread th;
    private boolean GAME_STARTED;
    private boolean GAME_OPTION;
    private boolean GAME_OVER;
    private int CScore=0;
    private int PScore=0   ;
    private int TopScore=5;
     
    public void init() {
        GAME_OPTION=true;
        GAME_STARTED=false;
        GAME_OVER=false;
        CScore=0;
        PScore=0;
        TopScore=5;
        myPlayer=new Player(20,125,10,50,Color.GREEN.darker());
        myComp=new Computer(370,124,10,50,Color.RED);
        myBall=new Ball(8,200,150,2,-2,Color.blue,this);
         
        
         
         
        addMouseMotionListener(this);
        addMouseListener(this);
        kicknoise = getAudioClip(getCodeBase(), "hit.au");
         
        GameName=
 ((Applet) this).getImage(((Applet) this).getCodeBase(), "images/gamename.gif");
         
         
    }
    public void start() {
         
    }
    public void stop() {
        th.interrupt();
    }
     
    public void paint(Graphics g) {
        if(GAME_OPTION) {
            Image codemiles=
((Applet) this).getImage(((Applet) this).getCodeBase(), "images/codemiles.gif");
             
            g.setColor(Color.GRAY);
             
            g.fillRect(0,0,400,400);
            g.setColor(Color.white);
             
            g.drawString("Press Mouse Click To Start Ball Sticker",100,100);
            g.drawImage(codemiles,150,150,this);
            g.drawString("Visit us ",35,250);
            g.drawImage( GameName,100,275,this);
             
        } else if(GAME_STARTED) {
            g.fillRect(0,0,400,300);
             
            myPlayer.DrawStrick(g);
            myComp.DrawStrick(g);
            myBall.DrawBall(g);
            g.setColor(Color.YELLOW);
            g.drawLine(25,32,375,32);
            g.drawLine(25,292,375,292);
            g.setColor(Color.GRAY);
            g.fillRect(400,300,400,100);
            g.setColor(Color.BLACK);
            g.drawString("Player Score :"+Integer.toString(PScore),50,350);
            g.drawString("Computer Score :"+Integer.toString(CScore),250,350);
             
        }
    }
     
    public void update(Graphics g) {
         
        if (dbImage == null) {
            dbImage = createImage(this.getSize().width, this.getSize().height);
            dbg = dbImage.getGraphics();
        }
         
         
        dbg.setColor(getBackground());
        dbg.fillRect(0, 0, this.getSize().width, this.getSize().height);
         
         
        dbg.setColor(getForeground());
        paint(dbg);
      
         
        g.drawImage(dbImage, 0, 0, this);
    }
    public void run() {
        Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
         
        while (true) {
             
             
             
            repaint();
            myBall.move();
             
             
            myComp.ComputerMove(myBall);
             
             
            int  whosgoal = myBall.wheresBall();
             
             
            if (whosgoal != 0) {
                if(whosgoal==1)
                    CScore++;
                else
                    PScore++;
                 
                if(PScore==5) {
                    GAME_STARTED=false;
                    GAME_OVER=GAME_OPTION=true;
                    th.interrupt();
                      repaint();
                }else if(CScore==5) {
                    GAME_STARTED=false;
                    GAME_OVER=GAME_OPTION=true;
                    th.interrupt();
                      repaint();
                }
                 
                myBall.x= 200;
                myBall.vx = 3;
                myBall.vy = -3;
                 
                 
            }
             
             
             
             
             
            if (myBall.vx < 0) {
                myBall.PCollision(myPlayer,kicknoise);
            } else if (myBall.vx > 0) {
                myBall.CCollision(myComp,kicknoise);
            }
             
            try {
                 
                Thread.sleep(15);
            } catch (InterruptedException ex) {
                break;
            }
             
             
            Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
        }
         
    }
     
     
     
     
     
    public void mouseDragged(MouseEvent e) {
    }
     
    public void mouseMoved(MouseEvent e) {
        int y=e.getY();
        if(y<250&&y>25)
            myPlayer.MoveByMouse(y);
         
    }
     
    public void mouseClicked(MouseEvent e) {
         
        if(!GAME_STARTED) {
            GAME_STARTED=true;
            GAME_OPTION=false;
            CScore=0;
            PScore=0;
            TopScore=5;
             
            myBall.vx = 3;
            myBall.vy = -3;
            th=new Thread(this);
            th.start();
             
        }
    }
     
    public void mousePressed(MouseEvent e) {
    }
     
    public void mouseReleased(MouseEvent e) {
    }
     
    public void mouseEntered(MouseEvent e) {
    }
     
    public void mouseExited(MouseEvent e) {
    }
     
     
}

Hope it is useful :)