how can i drow lines on image with swing

[Meir Yan]

Hello all
i have simple Jframe that loads image and display it on Jpanel
works great .
now i want to draw lines .. simple lines on that image
what should i look into , can you please give me link to something that does such thing ?
Thanks

[Craig Wood]

Lesson: Performing Custom Painting
Trail: 2D Graphics

[Meir Yan]

Thanks for the reply , it is what i needed .
now i have new question and i dont know if to open new thread so i will ask it here
i have Image on jpanel and the jpanel is on InternalFrame
now i what to be able to when the Jpanel resized to center the image to the Jpanel
how can it be done ?

[Craig Wood]

BufferedImage image;

protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    int w = getWidth();
    int h = getHeight();
    int iw = image.getWidth();
    int ih = image.getHeight();
    int x = (w - iw)/2;
    int y = (h - ih)/2;
    g.drawImage(image, x, y, this);