public void OnStateChanged(int newSun, int newWater)
{
Need thisChange = Need.Nothing;
if (newSun != curSun)
{
thisChange = Need.Sun;
}
if (newWater != curWater)
{
thisChange = Need.Water;
}
if (thisChange.Equals(currentNeed))
{
Grow();
}
else if (thisChange.Equals(Need.Nothing))
{
// do nothing
}
else
{
Die();
}
}