public void update() {
if (isInMotion()) {
Set<Motion> toRemove = new HashSet<Motion>();
for (Motion m : tweens) {
if (!m.isPlaying()) {
if (m.getPosition() == 0) {
m.play();
} else {
toRemove.add(m);
}
} else {
m.update();
}
}
for (Motion m : toRemove) {
tweens.remove(m);
}
}
}
public boolean isInMotion() {
return !tweens.isEmpty();
}