JAVA: How To Put Background Image In Swings

At this time, me n my frnz are busy finishing our graduation projects…..the other day , one of my frnz approached me for a discussion as she was not able to PUT A BACKGROUND IMAGE IN A SWINGS WINDOW , so well i spent sum time mugging over it n now at 2.20 AM i get it [ ...Bingo..!!! ] ….here i am posting the same code so that it may serve handy for you…

APPROACH :

I’ve been playing around with an ImagePanel which allows you to add an image to a panel and then add components normally to the panel. The goal is to avoid extending every component to draw an image. It does this by setting any component to non-opaque as it is added to the panel. That way the background image shows through.

CODE:

import java.awt.*;
import java.awt.image.*;
import javax.swing.*;

public class ImagePanel extends JPanel
{
public static final int TILED = 0;
public static final int SCALED = 1;
public static final int ACTUAL = 2;

private BufferedImage image;
private int style;
private float alignmentX = 0.5f;
private float alignmentY = 0.5f;

public ImagePanel(BufferedImage image)
{
this(image, TILED);
}

public ImagePanel(BufferedImage image, int style)
{
this.image = image;
this.style = style;
setLayout( new BorderLayout() );
}

public void setImageAlignmentX(float alignmentX)
{
this.alignmentX = alignmentX > 1.0f ? 1.0f : alignmentX < 0.0f ? 0.0f : alignmentX;
}

public void setImageAlignmentY(float alignmentY)
{
this.alignmentY = alignmentY > 1.0f ? 1.0f : alignmentY < 0.0f ? 0.0f : alignmentY;

}

public void add(JComponent component)
{
add(component, null);
}

public void add(JComponent component, Object constraints)
{
component.setOpaque( false );

if (component instanceof JScrollPane)
{
JScrollPane scrollPane = (JScrollPane)component;
JViewport viewport = scrollPane.getViewport();
viewport.setOpaque( false );
Component c = viewport.getView();

if (c instanceof JComponent)
{
((JComponent)c).setOpaque( false );
}
}

super.add(component, constraints);
}

protected void paintComponent(Graphics g)
{
super.paintComponent(g);

if (image == null ) return;

switch (style)
{
case TILED :
drawTiled(g);
break;

case SCALED :
Dimension d = getSize();
g.drawImage(image, 0, 0, d.width, d.height, null);
break;

case ACTUAL :
drawActual(g);
break;
}
}

private void drawTiled(Graphics g)
{
Dimension d = getSize();
int width = image.getWidth( null );
int height = image.getHeight( null );

for (int x = 0; x < d.width; x += width)
{
for (int y = 0; y < d.height; y += height)
{
g.drawImage( image, x, y, null, null );
}
}
}

private void drawActual(Graphics g)
{
Dimension d = getSize();
float x = (d.width – image.getWidth()) * alignmentX;
float y = (d.height – image.getHeight()) * alignmentY;
g.drawImage(image, (int)x, (int)y, this);
}

public static void main(String [] args)
throws Exception
{
BufferedImage image = javax.imageio.ImageIO.read( new java.io.File(“c:\\aditi.jpg”) );

ImagePanel north = new ImagePanel(image, ImagePanel.ACTUAL);
north.setImageAlignmentY(1.0f);
JTextArea text = new JTextArea(5, 40);
JScrollPane scrollPane = new JScrollPane( text );
north.add( scrollPane );

ImagePanel south = new ImagePanel(image, ImagePanel.SCALED);
JPanel buttons = new JPanel();
buttons.add( new JButton(“One”) );
buttons.add( new JButton(“Two”) );
JPanel boxes = new JPanel();
boxes.add( new JCheckBox(“One”) );
boxes.add( new JCheckBox(“Two”) );
south.add(buttons, BorderLayout.NORTH);
south.add(boxes, BorderLayout.SOUTH);

JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add( north, BorderLayout.NORTH );
frame.getContentPane().add( south, BorderLayout.SOUTH );
frame.pack();
frame.setVisible(true);
}
}

IMAGE NEEDED :

(paste this image in c: drive and save the code file as ImagePanel.java)

aditi.jpg

For any queries feel free to comment n ask me…