Java Programming

Using the code from BallPane.java and BounceBallControl.java (chapter 15), 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.

------------------------

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); 

} }

-----------------------------------------

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 // Override the start method in the Application class 

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();

}

}