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Thread: Please help with Arrow Keys

  1. #1
    Junior Member
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    Default Please help with Arrow Keys

    I don't know what is going on - I cannot get my arrow keys to affect the program to change the speed of the car.


    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
     
     
    @SuppressWarnings("serial")
    public class RacingCar extends JFrame {
     
    public RacingCar() {
    add(new CarImage());
    }
     
    public static void main(String[] args) {
    JFrame frame = new RacingCar();
    frame.setTitle("Racing Car");
    frame.setSize(300, 150);
    frame.setLocationRelativeTo(null);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true); 
     
    }
     
    class CarImage extends JPanel {
    protected int x = 0;
    protected int y = 150;
    protected int z = 300;
    protected int c = 0;
    protected int speed = 100;
     
    public CarImage() {
    Timer timer1 = new Timer(speed , new ActionListener(){
    public void actionPerformed(ActionEvent e) {
    x += 10;
    c ++;
    repaint();
    }
    });
    timer1.start();
     
    }
     
    public void actionPerformed(KeyEvent e) {
    if (e.getKeyCode() == KeyEvent.VK_UP) {
        speed -= 50;
     
    } else if (e.getKeyCode() == KeyEvent.VK_DOWN) {
        speed += 50;	
    }	
    }
     
     
    public void paintComponent(Graphics g) {
    super.paintComponent(g);
     
     
    // x = 0;
    y = getHeight();
    z = getWidth();
    g.setColor(Color.WHITE);
    g.fillRect(0, 0, z, y);
    Polygon polygon = new Polygon();
    polygon.addPoint(x + 10, y - 21);
    polygon.addPoint(x + 20, y - 31);
    polygon.addPoint(x + 30, y - 31);
    polygon.addPoint(x + 40, y - 21);
     
     
    if (x < z - 40) {
    g.setColor(Color.BLACK);
    g.fillOval(x + 10, y - 11, 10, 10);
    g.fillOval(x + 30, y - 11, 10, 10);
    g.setColor(Color.BLUE);
    g.fillRect(x, y - 21, 50, 10);
    g.setColor(Color.GRAY);
    g.fillPolygon(polygon);
    g.setColor(Color.RED);
    }
    else 
    x = 0;
     
    }
     
    }
    }


  2. #2
    Administrator copeg's Avatar
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    Default Re: Please help with Arrow Keys

    Duplicate of http://www.javaprogrammingforums.com...rrow-keys.html
    Thread locked

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