My question is how to fix my code so that when the application is run it will accept the keyboard inputs. Now then, I do have most of the code needed, but I am unsure what I am missing to get it to work.
Now please note, this program was made using Eclipse Luna(latest version) and JavaFX that used Scenebuilder to build the GUI, so please make sure everything that is for the solution will work with these aspects in mind.
Now then my code. Also by all means just take my code and repasted it with the corrections, so long as you can explain it alongside it. Just having one or the other is not going to be as effective as having both.
My PongController Class where everything was made
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.fxml.FXML;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.util.Duration;
import java.util.Random;
public class PongController {
final int PADDLE_MOVEMENT_INCREMENT = 7;
final int BALL_MOVEMENT_INCREMENT = 3;
double centerTableY;
DoubleProperty currentUserPaddleY = new SimpleDoubleProperty();
DoubleProperty currentComputerPaddleY = new SimpleDoubleProperty();
double initialComputerPaddleY;
DoubleProperty ballCenterX = new SimpleDoubleProperty();
DoubleProperty ballCenterY = new SimpleDoubleProperty();
double allowedPaddleTopY;
double allowedPaddleBottomY;
Timeline timeline;
@FXML
Rectangle table;
@FXML
Rectangle compPaddle;
@FXML
Rectangle userPaddle;
@FXML
Circle ball;
public void initialize() {
currentUserPaddleY.set(userPaddle.getLayoutY());
userPaddle.layoutYProperty().bind(currentUserPaddleY);
ballCenterX.set(ball.getCenterX());
ballCenterY.set(ball.getCenterY());
ball.centerXProperty().bind(ballCenterX);
ball.centerYProperty().bind(ballCenterY);
initialComputerPaddleY = compPaddle.getLayoutY();
currentComputerPaddleY.set(initialComputerPaddleY);
compPaddle.layoutYProperty().bind(currentComputerPaddleY);
allowedPaddleTopY = PADDLE_MOVEMENT_INCREMENT;
allowedPaddleBottomY = table.getHeight() - userPaddle.getHeight() - PADDLE_MOVEMENT_INCREMENT;
centerTableY = table.getHeight()/2;
}
public void keyReleasedHandler(KeyEvent event){
KeyCode keyCode = event.getCode();
switch (keyCode){
case UP:
process_key_Up();
break;
case DOWN:
process_key_Down();
break;
case S:
process_key_S();
break;
default:
break;
}
}
private void process_key_Up() {
if (currentUserPaddleY.get() > allowedPaddleTopY) {
currentUserPaddleY.set(currentUserPaddleY.get() - PADDLE_MOVEMENT_INCREMENT);
}
}
private void process_key_Down() {
if (currentUserPaddleY.get()< allowedPaddleBottomY) {
currentUserPaddleY.set(currentUserPaddleY.get() + PADDLE_MOVEMENT_INCREMENT);
}
}
private void process_key_S() {
ballCenterY.set(currentUserPaddleY.doubleValue() + userPaddle.getHeight()/2);
ballCenterX.set(userPaddle.getLayoutX());
moveTheBall();
}
private void moveTheBall(){
Random randomYGenerator = new Random();
double randomYincrement = randomYGenerator.nextInt(BALL_MOVEMENT_INCREMENT);
final boolean isServingFromTop = (ballCenterY.get() <= centerTableY)?true:false;
KeyFrame keyFrame = new KeyFrame(new Duration(10), event -> {
if (ballCenterX.get() >= -20) {
ballCenterX.set(ballCenterX.get() - BALL_MOVEMENT_INCREMENT);
if (isServingFromTop) {
ballCenterY.set(ballCenterY.get() + randomYincrement);
currentComputerPaddleY.set( currentComputerPaddleY.get() + 1);
}
else {
ballCenterY.set(ballCenterY.get() - randomYincrement);
currentComputerPaddleY.set(currentComputerPaddleY.get() - 1);
}
if(checkForBallPaddleContact(compPaddle)){
timeline.stop();
currentComputerPaddleY.set(initialComputerPaddleY);
bounceTheBall();
};
}
else {
timeline.stop();
currentComputerPaddleY.set(initialComputerPaddleY);
}
updateScore();
});
timeline = new Timeline(keyFrame);
timeline.setCycleCount(Timeline.INDEFINITE);
timeline.play();
}
private boolean checkForBallPaddleContact(Rectangle paddle){
if (ball.intersects(paddle.getBoundsInParent())){
return true;
} else {
return false;
}
}
private void bounceTheBall() {
double theBallOffTheTableX = table.getWidth() + 20;
KeyFrame keyFrame = new KeyFrame(new Duration(10), event -> {
if (ballCenterX.get() < theBallOffTheTableX) {
ballCenterX.set(ballCenterX.get() + BALL_MOVEMENT_INCREMENT);
if (checkForBallPaddleContact(userPaddle)){
timeline.stop();
moveTheBall();
};
}
else {
timeline.stop();
}
updateScore();
});
timeline = new Timeline(keyFrame);
timeline.setCycleCount(Timeline.INDEFINITE);
timeline.play();
}
private void updateScore(){
int computerScore = 0;
int userScore = 0;
if (ballCenterX.get() > table.getWidth()){
// Computer bounced the ball and the User didn't hit it back
computerScore ++;
} else if (ballCenterY.get() > 0 && ballCenterY.get() <= table.getHeight()){
// The User served the ball and Computer didn't hit it back
userScore++;
} else{
// The User served the ball off the table
computerScore++;
}
System.out.println("Computer: " + computerScore + ", User: " + userScore);
}
}
And this is my Main class
import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.fxml.FXMLLoader;
public class PongMain extends Application {
@Override
public void start(Stage primaryStage) {
try {
FXMLLoader loader = new FXMLLoader();
loader.setLocation(PongMain.class.getResource("GUI.fxml"));
Group root = (Group) loader.load();
Scene scene = new Scene(root,400,250);
primaryStage.setScene(scene);
primaryStage.show();
} catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
}
I just want to say thanks in advance, and that this is the first time ever using this website although I have used this website to get ideas in the past.
