web development helpdesk

You can create a JPanel subclass that uses the size of the panel to determine what size to paint the image. The image can then be painted in the (overridden) paintComponent() method at the required size.

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;


public class ScaledImagePanel extends JPanel
{
   private Image imageToDisplay = null;
  

   public void setImageToDisplay(Image imageToDisplay)
   {
      this.imageToDisplay = imageToDisplay;
   }

   @Override
   protected void paintComponent(Graphics g)
   {
      Dimension size = getSize();
      if (imageToDisplay!=null && size.width>0)
      {
         g.drawImage(imageToDisplay, 
            0, 0, size.width, size.height, 
            0, 0, imageToDisplay.getWidth(null), 
            imageToDisplay.getHeight(null),
            null);
      }
   }
}

written by objects \\ tags: image, panel