import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
public class JTiledPanel extends JPanel {
private Image tileimage;
private int tilewidth;
private int tileheight;
private Rectangle rb;
private Insets ri;
/**
* Create a JTiledPanel with the given image.
* The tile argument may be null, you can set it later
* with setTileImage(). Note that a JTiledPanel is
* always opaque.
*/
public JTiledPanel(Image tile) {
super();
setTileImage(tile);
setOpaque(true);
rb = new Rectangle(0,0,1,1);
ri = new Insets(0,0,0,0);
}
/**
* Create a JTiledPanel with the given image and
* layout manager and double buffering status.
* Either or both of the first two arguments
* may be null.
*/
public JTiledPanel(Image tile, LayoutManager mgr, boolean isDB)
{
super(mgr, isDB);
setTileImage(tile);
setOpaque(true);
rb = new Rectangle(0,0,1,1);
ri = new Insets(0,0,0,0);
}
/**
* Get the current tiling image, or null if there
* isn't any right now.
*/
public Image getTileImage() { return tileimage; }
public void setTileImage(Image tile) {
tileimage = tile;
tilewidth = 0;
tileheight = 0;
}
/**
* Paint this component
*/
public void paintComponent(Graphics g) {
super.paintComponent(g);
if (tileimage != null && tilewidth <= 0) {
tileheight = tileimage.getHeight(this);
tilewidth = tileimage.getWidth(this);
}
if (tileimage != null && tilewidth > 0) {
Color bg = getBackground();
getBounds(rb);
Insets riv = getInsets(ri);
rb.translate(riv.left, riv.top);
rb.width -= (riv.left + riv.right);
rb.height -= (riv.top + riv.bottom);
Shape ccache = g.getClip();
g.clipRect(rb.x, rb.y, rb.width, rb.height);
int xp, yp;
for(yp = rb.y; yp < rb.y + rb.height; yp += tileheight) {
for(xp = rb.x; xp < rb.x + rb.width; xp += tilewidth) {
g.drawImage(tileimage, xp, yp, bg, this);
}
}
g.setClip(ccache);
}
}
/**
* Small main to do a self-test. Tiles with a image file
* name taken from the command line. For example, if you
* have a directory named images and an image in it
* named tile1.gif then you would run this test
* main as java JTiledPanel images/tile1.gif.
*/
public static void main(String [] args) {
if (args.length == 0) {
System.out.println("Usage: java JTiledPanel imagefile");
System.exit(0);
}
JFrame f = new JFrame("Test JTiledPanel " + args[0]);
ImageIcon ic = new ImageIcon(args[0]);
JTiledPanel jtp = new JTiledPanel(ic.getImage());
jtp.setBorder(BorderFactory.createMatteBorder(3,4,5,6,Color.green));
jtp.add(new JButton("Press Me!"));
jtp.add(new JButton("Press Me Too!"));
f.getContentPane().add(jtp, BorderLayout.CENTER);
f.setSize(350,290);
f.show();
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
System.exit(0);
} });
}
}