调整图像大小，使其适合JPanel网格

Question

I have a JPanel with grid layout of (5 , 7 ) , 5 rows , 7 columns.

When i try to add images to a grid panel

    Img = new ImageIcon("ImagePath");
    JLabel Label = new JLabel(Img);
    add(picLabel);

It appears the image is too large for my grid panel , and only a small portion of the image is shown on the grid panel.

How do i add an image to the grid so that the images resizes to the grid size.???

Answer 1

Don't use a JLabel and ImageIcon. Instead, I'd

• Create a class that extends JPanel
• Override its paintComponent(Graphics g) method
• Remember to call the super's method in my override
• Give it a BufferedImage field, say called image
• Pass the image into the class via a constructor or setter parameter, or both.
• Call the g.drawImage(image,....) overload that allows for re-sizing of the image so that it fills the JPanel.

Links:

• Graphics API

Check out this overload:

public abstract boolean drawImage(Image img,
            int x,
            int y,
            int width,
            int height,
            ImageObserver observer)

or this one:

public abstract boolean drawImage(Image img,
            int dx1,
            int dy1,
            int dx2,
            int dy2,
            int sx1,
            int sy1,
            int sx2,
            int sy2,
            ImageObserver observer) 

---

Edit
For example,

// big warning: code not compiled nor tested
public class ImagePanel extends JPanel {
  private BufferedImage image;

  public ImagePanel(BufferedImage image) {
    this.image = image;
  }

  @Override
  protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    if (image != null) {
      g.drawImage(image, 0, 0, getWidth(), getHeight(), this);
    }
  }
}

Answer 2

How do i add an image to the grid so that the images resizes to the grid size.???

Check out Darryl's Stretch Icon .

It will dynamically resize itself to fill the space available to the label.

Then the Icon can be used an on component that takes an Icon without custom painting.