Painting in applets

Question

I ran into a problem using AWT in applets. Sometimes in IE the animated applets repaints in a random place. Sometimes it's taskbar area, sometimes browsers toolbar. I don't know if it's JRE 1.3.1_08's bug or it may be code's fault.
Anyone ran into similar issue?

Answer 1

Thanx Foxy Lady ;), but he problem occurs more often in an applet like this. Simple ticker with double buffering. I think the problem is in refreshing the applet more often than one second. Here's the code:
import java.applet.Applet;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Color;
import java.awt.FontMetrics;
import java.awt.Image;
public class Ticker extends Applet implements Runnable {
     * Whole text to draw.
    String text = new String();
     * Single line from the script.
    String line;
     * Speed of moving text.
    int delay;
     * Background color.
    int bgColor;
     * Foreground color.
    int color;
     * Flag indicating if this applet is still active.
    boolean flag = true;
    int i = 0;
     * Offscreen image for doublebuffering.
    Image offscreenImage;
     * Width of the whole text.
    int textWidth;
     * Width of the applet.
    int wdth;
     *  The initialization method - getting parameters from the script.
    public void init() {
        line = new String(getParameter("text"));
        bgColor = Integer.parseInt(getParameter("bgColor"), 16);
        color = Integer.parseInt(getParameter("color"), 16);
        delay = Integer.parseInt(getParameter("delay"));
        wdth = Integer.parseInt(getParameter("width"));
        setBackground(new Color(bgColor));
        setSize(wdth, 20);
        offscreenImage = createImage(wdth, 20);
    public void paint(Graphics g) {
        drawText(i, g);
     * Draws the text in the <code>iks</code> position.
     * @param iks position of the text.
     * @param gr graphics context.
    public void drawText(int iks, Graphics gr) {
        gr.setColor(new Color(color));
        gr.setFont(new Font("SansSerif", Font.BOLD, 15));
        if (iks < -(textWidth - wdth)) {
            //if the whole text went away to the left
            //we should draw it from the beginning
            gr.drawString(text, iks + textWidth, 15);
        gr.drawString(text, iks, 15);
    public void update(Graphics g) {
        //getting the offscreen graphics context
        Graphics offscreenG = offscreenImage.getGraphics();
        //clearing the offscreen
        offscreenG.clearRect(0, 0, wdth, 20);
        //drawing the text in the offscreen
        paint(offscreenG);
        //replacing the screen with a ready offscreen image
        g.drawImage(offscreenImage, 0, 0, this);
    public void run() {
        Graphics g = getGraphics();
        FontMetrics metrics;
        //preparing the text to show
        g.setFont(new Font("SansSerif", Font.BOLD, 15));
        metrics = g.getFontMetrics();
        textWidth = metrics.stringWidth(text);
        while (textWidth <= wdth) {
            //if the text is shorter than the applet width
            //we shoul repeat it after a "+" sign.
            text += "+" + line;
            textWidth = metrics.stringWidth(text);
        text = text + "+";
        text = "++" + text;
        textWidth = metrics.stringWidth(text);
        //repainting the applet
        while (flag) {
            if (i < -textWidth) i = 0;
            i--;
            repaint();
            try {
                Thread.sleep(delay * 20);
            } catch (InterruptedException e) {
     * Start the thread.
    public void start() {
        new Thread(this).start();
     * Stop the thread.
    public void stop() {
        flag = false;
    public void destroy() {
}