protected void addAnimation(Transition transition, Animation child) {
if (transition instanceof SequentialTransition) {
((SequentialTransition) transition).getChildren().add(child);
} else if (transition instanceof ParallelTransition) {
((ParallelTransition) transition).getChildren().add(child);
} else {
throw new IllegalArgumentException(
"Main transition must be either a Parallel or Sequential Transition");
}
}
