private IEnumerable<Action> Move(Animal animal)
{
for (int move = 0; move < animal.Moves; move++)
{
int dx = Random.Next(-1, 2);
int dy = Random.Next(-1, 2);
if (dx == 0 && dy == 0)
{
continue;
}
yield return () => this.savannah.Move(animal, animal.Y + dy, animal.X + dx);
}
}
private IEnumerable<Action> Act(Animal animal)
{
if (animal.IsAlive == false)
{
yield break;
}
animal.GetOlder();
animal.LoseWeight(animal.Weight * 0.25);
// Dies from overpopulation or starvation?
int max = this.savannah.NumTiles;
int animals = this.savannah.Animals.Count(a => a.GetType() == animal.GetType());
double k = Random.NextDouble();
bool dies = k < ((1.0 * animals) / (1.0 * max)) || animal.Age > Random.Next(5, 20);
if (dies)
{
yield return animal.Deactivate;
yield break;
}
for (int dy = -1; dy <= 1; dy++)
{
for (int dx = -1; dx <= 1; dx++)
{
int x = animal.X + dx;
int y = animal.Y + dy;
Grass neighbourGrass = this.savannah.Grasses.SingleOrDefault(g => g.X == x && g.Y == y);
Animal neighbourAnimal = this.savannah.Animals.SingleOrDefault(a => a.IsAlive && a.X == x && a.Y == y);
if (neighbourGrass!= null)
{
yield return () => neighbourGrass.Accept(animal);
}
if (neighbourAnimal != null)
{
yield return () => animal.Accept(neighbourAnimal);
}
}
}
}
private IEnumerable<Action> Cleanup(Animal animal)
{
if (animal.IsAlive == false)
{
yield return () => this.savannah.Remove(animal);
}
}
