public void drawingInvalidated(DrawingChangeEvent e) {
Rectangle r = e.getInvalidatedRectangle();
if (getDamage() == null) {
setDamage(r);
} else {
// don't manipulate rectangle returned by getDamage() directly
// because it could be a cloned rectangle.
Rectangle damagedR = getDamage();
damagedR.add(r);
setDamage(damagedR);
}
}
public void basicDisplayBox(Point origin, Point corner) {
fDisplayBox = new Rectangle(origin);
fDisplayBox.add(corner);
}