public void update(Graphics g) {
Dimension size = getSize();
if (offscreen == null)
offscreen =
createImage((size.width < 1) ? 1 : size.width, (size.height < 1) ? 1 : size.height);
Graphics og = offscreen.getGraphics();
if (og != null)
try {
og.setClip(g.getClip());
og.setColor(getBackground());
og.fillRect(0, 0, size.width, size.height);
super.paint(og);
} finally {
og.dispose();
}
paint(g);
}
