Image problem

[memati bas]

Hello,
I add an image to the Panel via the Label object. But, my image does not cover all the Panel. So how can I make my image cover all the panel ??


Thanks

[Craig Wood]

Here's one way to scale an image to fill a component. This approach is easy enough to adapt to AWT components. If you use a Label or Panel override "public void paint(Graphics g)". You may also have to override "public void update(Graphics g) { paint(g); }" to get it to work properly.

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.*;
 
public class ScaleToFill extends JPanel
{
    BufferedImage image;
    BufferedImage scaled;
 
    public ScaleToFill(BufferedImage image)
    {
        this.image = image;
        addComponentListener(resizer);
    }
 
    protected void paintComponent(Graphics g)
    {
        if(scaled == null) scale();
        g.drawImage(scaled, 0, 0, this);
    }
 
    private void scale()
    {
        int w = getWidth();
        int h = getHeight();
        int imgW = image.getWidth();
        int imgH = image.getHeight();
        double xScale = (double)w/imgW;
        double yScale = (double)h/imgH;
        double scale = Math.max(xScale, yScale);
        double x = (w - scale*imgW)/2;
        double y = (h - scale*imgH)/2;
        AffineTransform at = AffineTransform.getTranslateInstance(x,y);
        at.scale(scale,scale);
        scaled = new BufferedImage(w,h,image.getType());
        Graphics2D g2 = scaled.createGraphics();
        g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                            RenderingHints.VALUE_INTERPOLATION_BICUBIC);
        g2.drawRenderedImage(image, at);
        g2.dispose();
    }
 
    /** so image will always just fill this component */
    private ComponentListener resizer = new ComponentAdapter()
    {
        public void componentResized(ComponentEvent e)
        {
            scaled = null;
            repaint();
        }
    };
 
    public static void main(String[] args) throws IOException
    {
        String path = "images/cougar.jpg";
        BufferedImage bi = ImageIO.read(new File(path));
        ScaleToFill test = new ScaleToFill(bi);
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(test);
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
    }
}

[memati bas]

Can any of you give more clear and explanatory soltuion ??

Thanks.

[samir Sadiki]

Hi,
I don't know if there is a way to do what you wanna do using a Label.
You could draw the image directly on the Panel if you want.
Here is a sample code:

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

public class TestImage extends JPanel {


public static void main(String[] args) {
JFrame frame = new JFrame();
frame.getContentPane().add(new TestImage());
frame.setTitle("test image in panel");
frame.setSize(200, 100);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}

protected void paintComponent(Graphics g) {
super.paintComponent(g);
ImageIcon imageIcon = new ImageIcon("USA.gif");
Image image = imageIcon.getImage();
g.drawImage(image,0,0,getWidth(),getHeight(),this);
}
}

[memati bas]

Thanks very much for this...
It is indeed what I am searching for one days.

Again thanks very much,

Best wishes.

[samir Sadiki]

You are very welcome my friend.
Good luck!