Thread: Help with background and objects

I wonder how i can add my own background and change the ball to a image...

// Klassen Tennisbana
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
class Tennisbana extends JPanel implements ActionListener{
	private Timer klocka = new Timer(10, this);
	private JLabel visaPoäng; // För att visa poäng
	private int poäng;        // Aktuell poäng
	private int xMax;         // högsta tillåtna x-koordinat
	private int yMax;         // högsta tillåtna y-koordinat
	private int radie;        // bollens radie
	private int x;			  // x-koordinat, bollens mittpunkt
	private int y;            // y-koordinat, bollens mittpunkt
	private int vx;			  // bollens fart i x-led
	private int vy;			  // bollens fart i y-led
	private int xSteg;		  // bollens steglängd i x-led
	private int ySteg;		  // bollens steglängs i y-led
	private int racket;		  // rackets vänstra kant
	private int längdR;		  // rackets längd
	private int stegR;		  // rackets steglängd
 
	public Tennisbana(){
		setPreferredSize(new Dimension(300,600));
		setBackground(Color.black);
	}
 
	public void start(JLabel p){
		visaPoäng = p;
		xMax = getSize().width;
		yMax = getSize().height;
		radie = 15;
		längdR = 80;
		stegR = 15;
		nollställ();
 
		// Lyssnar på tangentbordet
		addKeyListener (new KeyAdapter(){
			public void keyPressed(KeyEvent e){
				if (e.getKeyCode() == KeyEvent.VK_A){
					racket = Math.max(0, racket-stegR);
				}
				else if (e.getKeyCode() == KeyEvent.VK_D){
					racket = Math.min(xMax-längdR, racket+stegR);
				}
			}
		});
 
		// Lyssnar på storleksändringar
		addComponentListener(new ComponentAdapter(){
			public void componentResized(ComponentEvent e){
				xMax = e.getComponent().getSize().width;
				yMax = e.getComponent().getSize().height;
				e.getComponent().requestFocus();
				repaint();
			}
		});
	}
	public void nollställ(){
		poäng = 0;
		visaPoäng.setText(" 0");
		xSteg = vx = 5;
		ySteg = vy = 5;
		x = xMax/2;
		y = radie+2;
		racket = xMax/2-längdR/2;
	}
 
	public void startaSpel(){
		if (poäng < 10){
			klocka.start();
		}
	}
 
	public void stoppaSpel(){
		klocka.stop();
	}
 
	public void nyttSpel(){
		stoppaSpel();
		nollställ();
		startaSpel();
	}
 
	// Anropas av timern var 10:e ms
	public void actionPerformed(ActionEvent e){
		if (y+radie >= yMax-4){
			if (x < racket || x > racket+längdR){
				Toolkit.getDefaultToolkit().beep();
				visaPoäng.setText(String.valueOf(++poäng));
				if (poäng >= 10){
					stoppaSpel();
				}
			}
			else if (xSteg > 0){
				xSteg++;
				vy++;
			}
			else{
				xSteg--;
				vy++;
			}
			ySteg = -vy;
		}
		else if (y-radie <= 0){
			ySteg = vy;
		}
 
		if (x-radie<=0 || x+radie>=xMax){
			xSteg = -xSteg;
		}
 
		x += xSteg;
		y += ySteg;
		if (y < radie){
			y = radie;
		}
		else if (y > yMax-radie){
			y = yMax-radie;
		}
		if (x < radie){
			x = radie;
		}
		else if (x > xMax-radie){
			x = xMax-radie;
		}
 
		repaint();
	}
 
	// Ritar boll och racket
	public void paintComponent(Graphics g) {
		super.paintComponent(g);
		g.setColor(Color.yellow);
		g.fillOval(x-radie, y-radie, 2*radie, 2*radie);
		g.setColor(Color.red);
		g.fillRect(racket, yMax-4, längdR, yMax);
	}
}

i´m not sure if its here i should add the codes but please help
Im from sweden so if you can swedish it would be easier to understand and the comments in the files is on swedish

Thx for the help


Ex67.java
Tennis.java
Tennisbana.java

Hej,

You should just be able to load an image using ImageIO or something and create your self a BufferedImage and then you can use one of the graphics.drawImage methods to draw this image.

    final BufferedImage bufferedImage = ImageIO.read(new File("c:/image.jpg")); // Ladda in en bild fran harddisk

And then in the paint method.

        g.drawImage(bufferedImage, x, y, null); // Rita ut bilden

However, be sure you dont create/load the image every time you paint, you're best of loading the image once and then just using the loaded image in the paint method.

// Json

where should i put in those codes and in what file?

Thx for the help btw

Recommended reading:
Lesson: Performing Custom Painting (The Java™ Tutorials > Creating a GUI With JFC/Swing)

db