Fit size of an ImageIcon to a JButton [duplicate]

问题:

This question already has answers here:

Resizing icon to fit on JButton in Java? (4 answers)

Closed 4 years ago.

Hi how can I fit the size of a ImageIcon to a JButton? I want to adjust the size of the ImageIcon to the size of the Button

JFrame frame2 = new JFrame("Tauler Joc");
JPanel panell = new JPanel();
ImageIcon icon = new ImageIcon("king.jpg");
JButton jb= new JButton(icon);
jb.setBounds(200,200,700,700);
panell.add(jb);
frame2.add(panell);
frame2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

回答1:

You can do it this way by simply adding a little method to your project:

private static Icon resizeIcon(ImageIcon icon, int resizedWidth, int resizedHeight) {
    Image img = icon.getImage();  
    Image resizedImage = img.getScaledInstance(resizedWidth, resizedHeight,  java.awt.Image.SCALE_SMOOTH);  
    return new ImageIcon(resizedImage);
}

Now, to use this method in your example code:

JFrame frame2 = new JFrame("Tauler Joc");
JPanel panell = new JPanel();
ImageIcon icon = new ImageIcon("king.jpg");
JButton jb= new JButton();
jb.setBounds(200,200,700,700);
panell.add(jb);

// Set image to size of JButton...
int offset = jb.getInsets().left;
jb.setIcon(resizeIcon(icon, jb.getWidth() - offset, jb.getHeight() - offset));

frame2.add(panell);
frame2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

If you just want the image and no border just set the offset variable to 0 or get rid of the offset variable altogether.