/// <summary>
/// Updates the background screen. Unlike most screens, this should not
/// transition off even if it has been covered by another screen: it is
/// supposed to be covered, after all! This overload forces the
/// coveredByOtherScreen parameter to false in order to stop the base
/// Update method wanting to transition off.
/// </summary>
public override void Update(GameTime gameTime, bool otherScreenHasFocus,
bool coveredByOtherScreen)
{
if (flock != null)
{
flock.Update(gameTime);
}
else
{
SpawnFlock();
}
base.Update(gameTime, otherScreenHasFocus, false);
}
