AnimationState(final State startState, final long milliseconds, boolean isForwardAndReverse) {
assert startState != null && milliseconds > 0;
assert SwingUtilities.isEventDispatchThread();
this.startState = startState;
this.duration = milliseconds * 1000000;
this.startTime = System.nanoTime();
this.isForwardAndReverse = isForwardAndReverse;
progress = 0f;
}
private void updateProgress() {
assert SwingUtilities.isEventDispatchThread();
if (isDone()) {
return;
}
long currentTime = System.nanoTime();
progress = ((float) (currentTime - startTime)) / duration;
progress = Math.max(progress, 0); // in case time was reset
if (progress >= 1) {
progress = 1;
if (isForwardAndReverse) {
startTime = currentTime;
progress = 0;
isForward = !isForward;
}
}
}