how to streach an image all over the button

[Peter Primrose]

hi there,
I got an image where I would like to strech it all over the button.
in the code below - it place it in a flow mode (and i would like it to be BorderLayout).


exit = new JButton();
exit.setIcon(new ImageIcon("images/Exit.gif"));

thanks for any help
peter

[Craig Wood]

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.*;
import javax.imageio.ImageIO;
import javax.swing.*;
 
public class ScalingExample implements ActionListener
{
    JButton left, right;
 
    public ScalingExample()
    {
        BufferedImage image = getImage();
        left  = new JButton(new ImageIcon(image));
        left.addActionListener(this);
        right = new JButton(new ImageIcon(image));
        right.addActionListener(this);
    }
 
    public void actionPerformed(ActionEvent e)
    {
        JButton button = (JButton)e.getSource();
        if(button == left)
            scaleLeft(button);
        if(button == right)
            scaleRight(button);
    }
 
    private void scaleLeft(JButton button)
    {
        // assuming the button icon is an ImageIcon
        Image image = ((ImageIcon)button.getIcon()).getImage();
        int w = button.getWidth();
        int h = button.getHeight();
        double width  = image.getWidth(button);
        double height = image.getHeight(button);
        double xScale = w / width;
        double yScale = h / height;
        //double scale = Math.min(xScale, yScale);   // scaleToFit
        double scale = Math.max(xScale, yScale);     // scaleToFill
        int sw = (int)(scale * width);
        int sh = (int)(scale * height);
        // assuming you want a jpg image
        int type = BufferedImage.TYPE_INT_RGB;
        BufferedImage scaled = new BufferedImage(sw, sh, type);
        Graphics2D g2 = scaled.createGraphics();
        g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                            RenderingHints.VALUE_INTERPOLATION_BICUBIC);
        AffineTransform at = AffineTransform.getScaleInstance(scale, scale);
        g2.drawImage(image, at, button);
        g2.dispose();
        button.setIcon(new ImageIcon(scaled));
    }
 
    private void scaleRight(JButton button)
    {
        // assuming the button icon is an ImageIcon
        Image image = ((ImageIcon)button.getIcon()).getImage();
        int w = button.getWidth();
        int h = button.getHeight();
        double width  = image.getWidth(button);
        double height = image.getHeight(button);
        double xScale = w / width;
        double yScale = h / height;
        //double scale = Math.min(xScale, yScale);   // scaleToFit
        double scale = Math.max(xScale, yScale);     // scaleToFill
        int sw = (int)(scale * width);
        int sh = (int)(scale * height);
        Image scaled = image.getScaledInstance(sw, sh, Image.SCALE_AREA_AVERAGING);
        MediaTracker tracker = new MediaTracker(button);
        tracker.addImage(scaled, 0);
        // load the new image
        try
        {
            tracker.waitForID(0);
        }
        catch(InterruptedException ie)
        {
            System.err.println("interrupt: " + ie.getMessage());
        }
        button.setIcon(new ImageIcon(scaled));
    }
 
    private BufferedImage getImage()
    {
        BufferedImage image = null;
        try
        {
            URL url = getClass().getResource("images/redfox.jpg");
            image = ImageIO.read(url);
        }
        catch(MalformedURLException mue)
        {
            System.err.println("url: " + mue.getMessage());
        }
        catch(IOException ioe)
        {
            System.err.println("read: " + ioe.getMessage());
        }
        return image;
    }
 
    private JPanel getPanel()
    {
        JPanel panel = new JPanel(new GridLayout(1,0));
        panel.add(left);
        panel.add(right);
        return panel;
    }
 
    public static void main(String[] args)
    {
        ScalingExample ex = new ScalingExample();
        JFrame f = new JFrame("click button to scale image");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(ex.getPanel());
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
    }
}

[Peter Primrose]

ohhhh....thank you sir