/**
* Check whether or not this rabbit is to give birth at this step.
* New births will be made into free adjacent locations.
* @param newRabbits A list to return newly born rabbits.
*/
public void GiveBirth(List <Rabbit> newRabbits)
{
// New rabbits are born into adjacent locations.
// Get a list of adjacent free locations.
List <Location> free = field.GetFreeAdjacentLocations(location);
int births = Breed();
for (int b = 0; b < births && free.Count > 0; b++)
{
Location loc = free[0];
free.RemoveAt(0);
Rabbit young = new Rabbit(false, field, loc);
newRabbits.Add(young);
}
}
/**
* Run the simulation from its current state for a single step. Iterate
* over the whole field updating the state of each fox and rabbit.
*/
public void SimulateOneStep()
{
step++;
// Provide space for newborn rabbits.
List <Rabbit> newRabbits = new List <Rabbit>();
// Let all rabbits act.
for (int r = 0; r < rabbits.Count; r++)
{
Rabbit rabbit = rabbits[r];
rabbit.Run();
if (!rabbit.IsAlive())
{
rabbits.Remove(rabbit);
}
else
{
rabbit.GiveBirth(newRabbits);
}
}
// Provide space for newborn foxes.
List <Fox> newFoxes = new List <Fox>();
// Let all foxes act.
for (int f = 0; f < foxes.Count; f++)
{
Fox fox = foxes[f];
fox.Hunt();
if (!fox.IsAlive())
{
foxes.Remove(fox);
}
else
{
fox.GiveBirth(newFoxes);
}
}
// Add the newly born foxes and rabbits to the main lists.
rabbits.AddRange(newRabbits);
foxes.AddRange(newFoxes);
//view.ShowStatus(step, field);
}
/**
* Look for rabbits adjacent to the current location.
* Only the first live rabbit is eaten.
* @return Where food was found, or null if it wasn't.
*/
private Location FindFood()
{
List <Location> adjacent = field.AdjacentLocations(location);
foreach (Location where in adjacent)
{
Object animal = field.GetAnimalAt(where);
if (animal is Rabbit)
{
Rabbit rabbit = (Rabbit)animal;
if (rabbit.IsAlive())
{
rabbit.SetDead();
foodLevel = RABBIT_FOOD_VALUE;
return(where);
}
}
}
return(null);
}
