More trouble with the robot class (takin a screencapture)

Question

I have created a small label which can have a transaprent background, and through the help of people on this forum, I am tryin to make it more robust. My latest task involves adding a component listener, and changing the background image when the parent component is moved.
Unfortunately, the background image is not being changed, but I dont know why. When I slow things down with a debugger, it seems that all of my x and y coordinates are correct, but the background image remains the same.
If you give it a shot, you will be able to see what I mean:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
public class LabelTest extends JWindow {
     static int x=300, y=300;
     public static void main(String[] args) {
          JFrame frame = new JFrame();
          frame.setPreferredSize(new Dimension(300,400));
          final LabelTest l = new LabelTest(frame, new Point(500,500), "My long string 222333111444555");
          l.setFont(new Font("Tahoma", Font.BOLD, 14));
          frame.addComponentListener(new ComponentAdapter() {
               public void componentMoved(ComponentEvent e) {
                    x+=5;
                    y+=5;
                    l.setLocation(x,y);
          frame.pack();
          frame.setVisible(true);
          l.setVisible(true);
     private BubbleLabel bubble;
     public LabelTest(JFrame owner, Point startingPoint, String text) {
          super(owner);
          setupBubble(startingPoint, text);
     public LabelTest(JDialog owner, Point startingPoint, String text) {
          super(owner);
          setupBubble(startingPoint, text);
     private void setupBubble(Point startingPoint, String text) {
          bubble = new BubbleLabel(startingPoint, text);
          this.setLocation(startingPoint);
          this.setLayout(new BorderLayout());
          this.add(bubble, BorderLayout.CENTER);
          this.pack();
     public void setFont(Font f) {
          bubble.setFont(f);
          this.pack();
     public void setLocation(int x, int y) {
          super.setLocation(x,y);
          bubble.updatePoint(x, y);
     public class BubbleLabel extends JLabel {
          private String myText;
        private BufferedImage image;
          private Point point;
          private Robot robot;
          public BubbleLabel(Point p, String text) {
               this.point = p;
               this.myText = text;
               try {
                    robot = new Robot();
               catch(AWTException e) {
                    e.printStackTrace();
               setupImage();
          public void updatePoint(int x, int y) {
               this.point = new Point(x,y);
               setupImage();
          private void setupImage() {
               if(point ==  null) {
                    return;
               try {
                    Dimension d = getPreferredSize();
                    image = robot.createScreenCapture(new Rectangle(point.x, point.y, d.width, d.height));
               catch(Exception e){
                    e.printStackTrace();
          public void setFont(Font f) {
               super.setFont(f);
               setupImage();
          public void paint(Graphics g) {
               Graphics2D g2 = (Graphics2D)g;
               g2.drawImage(image,0,0,this);
               //draw the labels
               Font f = getFont();
               if(f != null) {
                    FontMetrics fm = getFontMetrics(getFont());
                    g2.setColor(Color.GREEN);
                    g2.drawString(myText, 15, 25 + fm.getHeight()/2 - fm.getMaxDescent());
          public Dimension getPreferredSize() {
               Font f = getFont();
               if(f != null) {
                    FontMetrics fm = getFontMetrics(getFont());
                    int hieght = fm.getHeight();
                    int width = 0;
                    width = fm.stringWidth(myText);
                    System.err.println(width + 15);
                    return new Dimension(width + 15, hieght + fm.getHeight()*2);
               else {
                    return new Dimension(200, 200);
          public Dimension getMinimumSize() { return new Dimension(200, 200); }
}

Answer 1

Hi camickr,
I didn't ignore your suggestions, I just didn't completely understand them (I actually asked about them in my previous thread, but didn't get a response). Looking back at that thread, I realize that I read some of the code wrong. Where it saide desktopImage != null I saw desktopImage == null in the paintComponent() method. Now that I have reread it, I understand what you were getting at. However, that still doesn't solve the problem of the background changing. i.e. a screen behind my application is minimized.
As for your suggestions:
a) Right you are, I should be using paintComponent. I normally don't make this mistake, but I have been playing with so many different variations of this code, in different classes, that things have gotten quite mixed up. You also have to understand, that the code I posted is much smaller than the code I am working with, in order to be able to identify exactly what problem I am having, and not give you guys the burden of sorting through a lot of unrelevant code.
b) right you are again. I started with the JLabel, because I was going to use some of the class's properties, but as my code has progressed, I have steered away from that approach. However, for my puproses I don't see the downside of using it. I want to get my core functionality working, and then clean the code up.
c) see first paragraph
d) I haven't looked into it, but I am not so sure this would work for my purposes. I use the graphics package to draw a border around the text (I cant use the border classes because this is not a uniform border). I suppose this is more reason to use a JComponent than a JLabel.
e) The is no real logic to my component listener. I wrote it to show the problem I am having. I just increased the pixels by 5 for each call, because that was the simplest way to show that the background image was not being 1) created correctly or 2) painted correctly. As I said before, I want to solve the core issues first, then clean up the code so it actually behaves in a manner that makes sense.
I don't know why the code didn't execute for you. Are you just not seing the text at 500,500? It should say: "My long string 222333111444555" in Green, with a transparent background (i.e. the screenshot of the background image.
Thanks for your suggestions. I appreciate your help!