How to set repeating background image to a JPanel?


I want to set an image which repeats throughout the full width of the JPanel like we apply Background image to a DIV in CSS. How do I obtain that in swing for a JPanel?


Swing doesn't provide this functionality out of the box, so you will need to do it yourself...

The overall process is relative simple,

for (y = 0 to containerHeight) do for (x = 0 to containerWidth) do drawImage(tile, x, y)

The fun part is knowing where and how to apply it. Take a look at:

<ul><li><a href="http://docs.oracle.com/javase/tutorial/uiswing/painting/" rel="nofollow">Performing Custom Painting</a></li> <li><a href="http://docs.oracle.com/javase/tutorial/2d/" rel="nofollow">2D Graphics</a></li> <li><a href="http://docs.oracle.com/javase/tutorial/2d/images/loadimage.html" rel="nofollow">Reading/Loading an Image</a></li> </ul>

For details about the various parts you will need to know.


So using this as the tile...

<img alt="Tile" class="b-lazy" data-src="https://i.stack.imgur.com/mvua8.jpg" data-original="https://i.stack.imgur.com/mvua8.jpg" src="https://etrip.eimg.top/images/2019/05/07/timg.gif" />

I was able to produce this...

<img alt="tiled" class="b-lazy" data-src="https://i.stack.imgur.com/3QzyD.png" data-original="https://i.stack.imgur.com/3QzyD.png" src="https://etrip.eimg.top/images/2019/05/07/timg.gif" />

import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.IOException; import java.util.logging.Level; import java.util.logging.Logger; import javax.imageio.ImageIO; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; public class PaintTitle { public static void main(String[] args) { new PaintTitle(); } public PaintTitle() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { } JFrame frame = new JFrame("Testing"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.add(new TestPane()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class TestPane extends JPanel { private BufferedImage tile; public TestPane() { try { tile = ImageIO.read(getClass().getResource("/tile.jpg")); } catch (IOException ex) { ex.printStackTrace(); } } @Override public Dimension getPreferredSize() { return new Dimension(200, 200); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g.create(); int tileWidth = tile.getWidth(); int tileHeight = tile.getHeight(); for (int y = 0; y < getHeight(); y += tileHeight) { for (int x = 0; x < getWidth(); x += tileWidth) { g2d.drawImage(tile, x, y, this); } } g2d.dispose(); } } }


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