How to fit Image size to JFrame Size?

Question

I have a JPanel into a JFrame. I loaded a picture on the JPanel but its shown just a part of the picture: This is the part of the code where i did it:

JPanel panelImg = new JPanel()
{
    public void paintComponent(Graphics g)
    {
        Image img = new ImageIcon("Welcome.png").getImage();
        Dimension size = new Dimension(img.getWidth(null), img.getHeight(null));
        setPreferredSize(size);
        setMinimumSize(size);
        setMaximumSize(size);
        setSize(size);
        setLayout(null);
        g.drawImage(img, 0, 0, null);
    }
};
mainFrame.add(panelImg);

So this is how it looks like:

The complete picture looks like this:

enter image description here

Is there a way to scale the picture to the JFrames size? Thanks in advance

Have a look at some of these answers: http://stackoverflow.com/a/12660146/1133011 and here http://stackoverflow.com/a/12996718/1133011 they both show how to display and scale images on `JPanel`/`JFrame`. You will just have to scale it now to frame size via `getWidth()` and `getHeight()` (+1 to @trashgod and @MadProgrammer) — David Kroukamp, Oct 23 '12 at 20:53

score 14 · Answer 1 · edited May 23 '17 at 12:26

14

You want the drawImage() that scales to the target container. See the article cited here for alternatives. For example,

g.drawImage(img, 0, 0, getWidth(), getHeight(), this);

edited May 23 '17 at 12:26

Community

1
1

answered Oct 23 '12 at 20:11

trashgod

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score 13 · Accepted Answer · edited May 23 '17 at 12:18

13

First of all, I wouldn't be loading the image inside the paintComponent method, this method is call repeatedly (and some times in quick succession), you don't want to do anything that takes time to execute or consumes resources unnecessarily

Check out Java: maintaining aspect ratio of JPanel background image for suggestions on filling/fitting images to a given area

edited May 23 '17 at 12:18

Community

1
1

answered Oct 23 '12 at 20:17

MadProgrammer

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Good point about latency; [obligatory example](http://stackoverflow.com/a/4530659/230513). – trashgod Oct 23 '12 at 20:24

score 1 · Answer 3 · edited Apr 15 '15 at 18:04

1

you can try this :

Image img = new ImageIcon(ImageIO.read(new File("welcome.png"))
                               .getScaledInstance(WIDTH, HEIGHT, Image.SCALE_SMOOTH)));

edited Apr 15 '15 at 18:04

Eng.Fouad

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answered Jun 22 '14 at 15:15

AvB

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javatar · Answer 4 · 2016-01-01T06:06:54.090

Its Easy. Follow this example,

public class BasePanel extends JPanel {

ImageIcon backImage;
public BasePanel() {
    backImage = new ImageIcon("src/images/welcome.png");
}

@Override
protected void paintComponent(Graphics g) {
    BufferedImage scaledImage = getScaledImage();
    super.paintComponent(g);
    g.drawImage(scaledImage, 0, 0, null);
}

private BufferedImage getScaledImage(){
    BufferedImage image = new BufferedImage(getWidth(),getHeight(), BufferedImage.TYPE_INT_RGB);
    Graphics2D g2d = (Graphics2D) image.createGraphics();
    g2d.addRenderingHints(new RenderingHints(RenderingHints.KEY_RENDERING,RenderingHints.VALUE_RENDER_QUALITY));
    g2d.drawImage(backImage.getImage(), 0, 0,getWidth(),getHeight(), null);

    return image;
}

}

How to fit Image size to JFrame Size?

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