public static FadeTo $(float alpha, float duration) {
FadeTo action = pool.obtain();
action.toAlpha = Math.min(Math.max(alpha, 0.0f), 1.0f);
action.duration = duration;
action.invDuration = 1 / duration;
return action;
}
@Override
public void finish() {
super.finish();
pool.free(this);
}