public static Rectangle[] computeDifference(final Rectangle rect1, final Rectangle rect2) {
if (rect1 == null || rect1.isEmpty() || rect2 == null || rect2.isEmpty()) {
return new Rectangle[0];
}
Rectangle isection = rect1.intersection(rect2);
if (isection.isEmpty()) {
return new Rectangle[0];
}
ArrayList reminders = new ArrayList(4);
substract(rect1, isection, reminders);
return (Rectangle[]) reminders.toArray(new Rectangle[0]);
}
