/// <summary>
/// Find best step for escaping
/// </summary>
private Position FindBestStepToEscape(Herbivore herbivore, Field field)
{
var maxDistance = double.MinValue;
var bestStep = new Position(0, 0);
var nextStep = new Position();
for (nextStep.X = -herbivore.MaxSpeed; nextStep.X <= herbivore.MaxSpeed; nextStep.X++)
{
for (nextStep.Y = -herbivore.MaxSpeed; nextStep.Y <= herbivore.MaxSpeed; nextStep.Y++)
{
var newPosition = herbivore.Position.Clone().Add(nextStep);
if (!_validator.PositionIsOutOfField(field, newPosition) &&
(!_validator.PositionIsTaken(field, newPosition) || herbivore.Position.Equals(newPosition)))
{
var distance = _calculations.Distance(newPosition, herbivore.ClosestEnemy.Position);
if (distance > maxDistance)
{
maxDistance = distance;
bestStep = nextStep.Clone();
}
}
}
}
return(bestStep);
}
/// <summary>
/// Get step in a random direction
/// </summary>
private Position GetRandomStep(Animal carnivore, Field field)
{
Position nextStep;
bool moveIsValide;
do
{
nextStep = _random.GetRandomStep(carnivore.MaxSpeed);
var newPosition = nextStep.Clone().Add(carnivore.Position);
moveIsValide = !_validator.PositionIsOutOfField(field, newPosition) &&
(!_validator.PositionIsTaken(field, newPosition) || carnivore.Position.Equals(newPosition));
} while (!moveIsValide);
return(nextStep);
}
/// <summary>
/// Get free position on the field. If field is full , throw InvalidOperationException.
/// </summary>
private Position GetFreePosition(Field field)
{
if (field.HasFreeSpace == false)
{
throw new InvalidOperationException("Field has no free space");
}
Position newPosition;
do
{
newPosition = new Position(_random.Get(field.Width), _random.Get(field.Height));
} while (_validator.PositionIsTaken(field, newPosition));
return(newPosition);
}
