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LightfireStorm

Sat Apr 08, 2017 9:40 am


Pong and menu help

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hello I am having troble getting the paddle to go up and down... I don't know what else to try can some one help me?
here is my code:



import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

import static java.awt.event.KeyEvent.*;

/**
 * This class implements a panel which can be inserted into a JFrame.
 * The panel implements the Pong game.
 */
public class Pong2 extends JPanel implements Runnable, ActionListener{

    // ball positioning variables
    int ball_x, ball_y;
    // ball move pixel size
    int ball_dx=2, ball_dy=2;
    // ball size
    int ball_r = 20;
    // rendering area pixel boundary variables
    int x_left, x_right, y_top, y_bottom;
    // the actual frame
    JFrame frame;
    // the color of the ball
    Color ball_color = Color.blue;
    // the amount of time we wait when moving the ball
    long moveWait = 15;

    int paddle_y, paddle_x, paddle_w, paddle_h, paddle_dy;




    /**
     * Constructor
     */
    public Pong2(final JFrame frame){
        addKeyListener(new ImputKeyEvents());
        this.frame = frame;
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI asynchronously to
        //ensure that all the swing resources are already set-up when we do this.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI(frame);
            }
        });
    }

    /**
     * this is where we set up the UI
     */
    protected void createAndShowGUI(final JFrame frame){

        // initialize the frame
        frame.setContentPane(this);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setJMenuBar(createAndInitMenuBar());
        // register for window resize events
        frame.addComponentListener(new ComponentAdapter() {
            public void componentResized(ComponentEvent e) {
                // This is only called when the user releases the mouse button.
                x_right = frame.getContentPane().getWidth() - ball_r;
                y_top = frame.getContentPane().getHeight() - ball_r;
            }
        });
        // size the frame and show
        frame.pack();
        frame.setSize(500,500);
        frame.setVisible(true);
        getFocus(frame);
        // start the ball off in the middle
        ball_x = this.getWidth()/2;
        ball_y = this.getHeight()/2;
        // initialize the randering boundaries
        x_left = 0;
        x_right = this.getWidth() - ball_r;
        y_top = this.getHeight() - ball_r;
        y_bottom = 0;
        paddle_y = 225;
        paddle_x = 30;
        paddle_w = 20;
        paddle_h = 50;
        paddle_y += paddle_dy;

    }

    /**
     * creates the menu
     */
    protected JMenuBar createAndInitMenuBar(){

        JMenuBar menuBar;
        JMenu menu, submenu;
        JMenuItem menuItem;
        JRadioButtonMenuItem rbMenuItem;
        JCheckBoxMenuItem cbMenuItem;

        //Create the menu bar.
        menuBar = new JMenuBar();

        //Build the first menu.
        menu = new JMenu("Speed");
        menu.setMnemonic(VK_S);
        menu.getAccessibleContext().setAccessibleDescription("Set the speed of the ball");
        menuBar.add(menu);

        //a group of JMenuItems
        menuItem = new JMenuItem("Increase", VK_I);
        menuItem.setAccelerator(KeyStroke.getKeyStroke(VK_1, ActionEvent.ALT_MASK));
        menuItem.getAccessibleContext().setAccessibleDescription("Increase the speed of the ball");
        menuItem.addActionListener(this);
        menu.add(menuItem);
        menuItem = new JMenuItem("Decrease", VK_D);
        menuItem.setAccelerator(KeyStroke.getKeyStroke(VK_2, ActionEvent.ALT_MASK));
        menuItem.getAccessibleContext().setAccessibleDescription("Decrease the speed of the ball");
        menuItem.addActionListener(this);
        menu.add(menuItem);

        //Build second menu in the menu bar.
        menu = new JMenu("Another Menu");
        menu.setMnemonic(VK_N);
        menu.getAccessibleContext().setAccessibleDescription("This menu does nothing");
        menuBar.add(menu);

        return menuBar;
    }

    /**
     * helper method which we use to get the focus
     */
    public void getFocus(final JFrame frame)
    {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                frame.requestFocus();
            }
        });
    }

    /**
     * implementation of the Runnable interface to be able to move the ball, etc.
     */
    public void run(){

        while(true){

            ball_x += ball_dx;
            if(ball_x = x_right){
                ball_dx *=-1;
                ball_x += (2*ball_dx);
            }

            ball_y += ball_dy;
            if(ball_y = y_top){
                ball_dy *=-1;
                ball_y += (2*ball_dy);
            }
           /* if (collision()) {
                ball_dx *= -1;
                ball_x += (2 * ball_dx);

            }*/
            paddle_y += paddle_dy;
            if (paddle_y >= y_top) {
                paddle_dy -= 10;
            }
            paddle_y += paddle_dy;
            if (paddle_y  400)
                    moveWait = 400;
            }
        }
    public class ImputKeyEvents extends KeyAdapter {
        @Override
        public void keyPressed(KeyEvent e) {
            super.keyPressed(e);
            int KeyCode =  e.getKeyCode();
            if (KeyCode == KeyEvent.VK_UP) {
                paddle_dy += 5;
            } else if (KeyCode == KeyEvent.VK_DOWN) {
                paddle_dy -= 5;
            }
        }
        @Override
        public void keyReleased(KeyEvent e) {
            int KeyCode =  e.getKeyCode();
            if (KeyCode == KeyEvent.VK_UP) {
                paddle_dy += 0;
            } else if (KeyCode == KeyEvent.VK_DOWN) {
                paddle_dy += 0;
            }
        }
    }


        // Returns just the class name -- no package info.
    protected String getClassName(Object o) {
        String classString = o.getClass().getName();
        int dotIndex = classString.lastIndexOf(".");
        return classString.substring(dotIndex+1);
    }

}