private void Flee(Strand strand, Chemoeffector noxious)
{
double distance;
distance = Geometry.GetDistance(strand.Position, noxious.Position);
if (distance <= 1)
{
this.ProcessCollision(strand, noxious, _repellents, _repellentCollisionAction, () => this.AddRepellent());
}
else
{
if (distance < strand.PreviousSensor)
{
this.Tumble(strand);
this.CheckCollisions(strand);
}
else
{
double newDistance;
Point heading;
heading = strand.Heading;
this.Tumble(strand);
strand.Move();
newDistance = Geometry.GetDistance(strand.Position, noxious.Position);
if (newDistance < distance)
{
strand.Heading = heading;
}
strand.UndoMove();
}
strand.PreviousSensor = distance;
}
}
private void CheckFission(Strand strand)
{
if (_binaryFission && _environmentRandom.NextDouble() < 0.001 && strand.Strength % 2 == 0)
{
strand.Strength /= 2;
_strands.Add(strand.Copy());
}
}
private void Tumble(Strand strand)
{
double dir;
//int x;
//int y;
dir = _movementRandom.NextDouble();
//x = strand.Heading.X;
//y = strand.Heading.Y;
if (dir < 0.33)
{
// counter-clockwise
strand.Heading = Compass.GetPrevious(strand.Heading);
}
else if (dir > 0.66)
{
// clockwise
strand.Heading = Compass.GetNext(strand.Heading);
}
//if (dir < 0.125)
//{
// x = -1;
//}
//else if (dir > 0.125 && dir < 0.250)
//{
// x = 1;
//}
//else if (dir > 0.250 && dir < 0.375 && y != 0)
//{
// x = 0;
//}
//else if (dir > 0.375 && dir < 0.5)
//{
// y = -1;
//}
//else if (dir > 0.5 && dir < 0.625)
//{
// y = 1;
//}
//else if (dir > 0.625 && dir < 0.75 && x != 0)
//{
// y = 0;
//}
//strand.Heading = new Point(x, y);
}
private void MoveStrand(Strand strand)
{
Chemoeffector noxious;
strand.Move();
noxious = this.GetClosestRepellor(strand);
if (noxious != null)
{
this.Flee(strand, noxious);
}
else
{
Chemoeffector food;
food = this.GetClosestAttractor(strand);
if (food != null)
{
this.Approach(strand, food);
}
else if (strand.PreviousSensor != 0)
{
strand.Heading = Compass.GetOpposite(strand.Heading);
this.Tumble(strand);
strand.PreviousSensor = 0;
this.CheckCollisions(strand);
}
else
{
this.Tumble(strand);
strand.PreviousSensor = 0;
this.CheckCollisions(strand);
}
}
}
private void Approach(Strand strand, Chemoeffector food)
{
double distance;
distance = Geometry.GetDistance(strand.Position, food.Position);
if (distance <= 1)
{
this.ProcessCollision(strand, food, _attractors, _attractorCollisionAction, this.CheckRespawn);
strand.PreviousSensor = 0;
}
else
{
if (distance > strand.PreviousSensor)
{
this.Tumble(strand);
this.CheckCollisions(strand);
}
else
{
double newDistance;
Point heading;
heading = strand.Heading;
this.Tumble(strand);
strand.Move();
newDistance = Geometry.GetDistance(strand.Position, food.Position);
if (newDistance >= distance)
{
strand.Heading = heading;
}
strand.UndoMove();
}
strand.PreviousSensor = distance;
}
}
private void ProcessCollision(Strand strand, Chemoeffector chemoeffector, ChemoeffectorCollection container, CollisionAction action, Action createNew)
{
if (action == CollisionAction.ReduceSelf)
{
chemoeffector.Strength--;
strand.Strength++;
}
else if (action == CollisionAction.ReduceOther)
{
strand.Strength--;
}
if (chemoeffector.Strength <= 0 || action == CollisionAction.DestroySelf)
{
container.Remove(chemoeffector);
createNew();
}
if (strand.Strength <= 0 || action == CollisionAction.DestroyOther)
{
_strands.Remove(strand);
}
}
private Chemoeffector GetStrongestChemoeffector(Strand strand, ChemoeffectorCollection container)
{
Chemoeffector result;
int strength;
result = null;
strength = 0;
for (int i = 0; i < container.Count; i++)
{
Chemoeffector chemoeffector;
chemoeffector = container[i];
if (Geometry.DoesPointIntersectCircle(strand.Position, chemoeffector.Position, (chemoeffector.Strength / 2) + 4) && // add a bit of a buffer so even the smallest have a gradient
chemoeffector.Strength > strength)
{
strength = chemoeffector.Strength;
result = chemoeffector;
}
}
return(result);
}
private void CheckCollisions(Strand strand)
{
for (int i = 0; i < _repellents.Count; i++)
{
if (Geometry.GetDistance(strand.Position, _repellents[i].Position) <= 1)
{
this.ProcessCollision(strand, _repellents[i], _repellents, _repellentCollisionAction, () => this.AddRepellent());
}
}
for (int i = 0; i < _attractors.Count; i++)
{
if (Geometry.GetDistance(strand.Position, _attractors[i].Position) <= 1)
{
this.ProcessCollision(strand, _attractors[i], _attractors, _attractorCollisionAction, this.CheckRespawn);
break;
}
}
if (_solidStrands)
{
for (int i = 0; i < _strands.Count; i++)
{
Strand other;
other = _strands[i];
if (!object.ReferenceEquals(strand, other) && strand.Position == other.Position)
{
strand.UndoMove();
strand.Heading = _movementRandom.NextDouble() >= 0.5 ? Compass.GetNextQuarter(strand.Heading) : Compass.GetPreviousQuarter(strand.Heading);
break;
}
}
}
}
private Chemoeffector GetStrongestRepellor(Strand strand)
{
return(this.GetStrongestChemoeffector(strand, _repellents));
}
private Chemoeffector GetStrongestAttractor(Strand strand)
{
return(this.GetStrongestChemoeffector(strand, _attractors));
}
