// MATCH VELOCITY WITH THE FLOCK
Vector2 Rule3(Boid _boid)
{
Vector2 PercievedVelocity = new Vector2();
PercievedVelocity.X = _boid.velocity.X;
PercievedVelocity.Y = _boid.velocity.Y;
int effectedBy = 0;
for (int i = 0; i < prey.Count; i++)
{
if (prey[i] != _boid)
{
if ((prey[i].position - _boid.position).Length() < awarenessRadius)
{
PercievedVelocity = PercievedVelocity + prey[i].velocity;
effectedBy++;
}
}
}
PercievedVelocity = PercievedVelocity / (float)(effectedBy + 1);
return (PercievedVelocity - _boid.velocity) / 500.0f;
}
// MOVE AWAY FROM ONE ANOTHER
Vector2 Rule2(Boid _boid)
{
Vector2 c = new Vector2(); ;
for (int i = 0; i < prey.Count; i++)
{
if (prey[i] != _boid)
{
if ((_boid.position - prey[i].position).Length() < awarenessRadius)
{
Vector2 temp = prey[i].position - _boid.position;
if (temp.Length() < 50.0f)
{
c = c - (prey[i].position - _boid.position);
}
}
}
}
return c / 10.0f;
}
// MOVE TOWARDS THE CENTER OF THE FLOCK
Vector2 Rule1(Boid _boid)
{
_boid.influenceTracker = 0.0f;
Vector2 PercievedCenterOfMass = new Vector2();
PercievedCenterOfMass.X = _boid.position.X;
PercievedCenterOfMass.Y = _boid.position.Y;
int effectedBy = 0;
for (int i = 0; i < prey.Count; i++)
{
if (prey[i] != _boid)
{
if ((_boid.position - prey[i].position).Length() < awarenessRadius)
{
PercievedCenterOfMass = PercievedCenterOfMass + prey[i].position;
_boid.influenceTracker += 1.0f / 20.0f;
effectedBy++;
}
}
}
if (_boid.influenceTracker > 1.0f)
_boid.influenceTracker = 1.0f;
PercievedCenterOfMass = PercievedCenterOfMass / (float)(effectedBy + 1);
return (PercievedCenterOfMass - _boid.position) / 500.0f;
}
void LimitVelocity(Boid _boid)
{
float magmax = 200.0f;
if (_boid.velocity.Length() > magmax)
{
if (_boid.velocity.X == 0.0f || _boid.velocity.Y == 0.0f)
return;
float xsign = _boid.velocity.X / Math.Abs(_boid.velocity.X);
float ysign = _boid.velocity.Y / Math.Abs(_boid.velocity.Y);
float r = Math.Abs(_boid.velocity.X / _boid.velocity.Y);
float tempy = (float)Math.Sqrt((magmax * magmax) / (1.0f + (r * r)));
float tempx = tempy * r;
_boid.velocity.Y = tempy * ysign;
_boid.velocity.X = tempx * xsign;
}
}
Vector2 FollowMouse(Boid _boid)
{
Vector2 mouse = Vector2.Zero; //new Vector2(Input.MousePos.X, Input.MousePos.Y);
return (mouse - _boid.position) / 100.0f;
}
Vector2 Cage(Boid _boid)
{
Vector2 v = new Vector2();
if (_boid.position.X < cageLeft)
v.X = 100.0f;
if (_boid.position.X > cageRight)
v.X = -100.0f;
if (_boid.position.Y < cageTop)
v.Y = 100.0f;
if (_boid.position.Y > cageBottom)
v.Y = -100.0f;
return v;
}
