void Update()
{
var state = gameObject.GetComponent <WeightEnemy>().CurrentState;
var y = (originalPosition_.y - transform.localPosition.y) / moveLengthY;
// Forecast an enemy's y-position because of servo delay.
if (state == WeightEnemy.State.FALLING)
{
y += (transform.localPosition.y - groundPosition_.y) * EnemyFallingForecast;
}
else if (state == WeightEnemy.State.RISING)
{
y -= EnemyRisingForecast;
}
servo_.SetY(y);
}