public Vector Execute(Tank tank, int timeElapsed)
{
Vector steeringForce = new Vector(0, 0);
//Keep following path until finished
if (tank.PlayerInAttackZone())
{
ClearPath();
tank.ChangeState(new TankAttackPlayer());
}
else if (tank.PlayerNotSeenAtLastLocation())
{
ClearPath();
tank.ChangeState(new TankPatrol(tank));
}
else if (path.Count == 0)
{
tank.gameWorld.GridLogic.CalculateNeighborsEntities(tank, Tank.MaxRadiusOfTankSeight);
foreach (MovingEntity entity in tank.gameWorld.GridLogic.EntitiesInRange)
{
if (entity is Player)
{
searchAStar = new SearchAStar(tank, entity.InCell);
searchAStar.Search();
path = searchAStar.GetPathToTarget();
if (path.Count == 0)
{
return(steeringForce);
}
//Path starts from end of list so the path following needs to be started at the end of the list
i = path.Count - 1;
steeringForce = seek.Execute(tank, path[i].Position) * GlobalVars.SeekingWeight;
}
}
}
else
{
if (i > 0)
{
//Seek current cell in path
steeringForce = seek.Execute(tank, path[i].Position) * GlobalVars.SeekingWeight;
// steeringForce += avoid.Execute(tank) * GlobalVars.ObstacleAvoidanceWeight;
//go to next step in path if the tank approximatly reached the cell
if (tank.DistanceToPosition(path[i].Position) <= GlobalVars.cellSize / 2)
{
i--;
}
}
else
{
ClearPath();
}
}
return(steeringForce);
}
public Vector Execute(Tank tank, int timeElapsed)
{
Vector steeringForce = new Vector(0, 0);
if (tank.PlayerInSearchZone())
{
tank.ChangeState(new TankSearchForPlayer());
}
else if (tank.PlayerInDangerZone())
{
tank.ChangeState(new TankCreateDistanceBetweenPlayer());
}
else if (tank.PlayerIsOutOfSeight())
{
tank.ChangeState(new TankPatrol(tank));
}
else
{
tank.gameWorld.GridLogic.CalculateNeighborsEntities(tank, Tank.TankAttackDistance);
foreach (MovingEntity entity in tank.gameWorld.GridLogic.EntitiesInRange)
{
if (entity is Player)
{
steeringForce = seek.Execute(tank, entity.Position);
// Aim turret at player
Vector playerTank = entity.Position - tank.Position;
tank.AngleTankTurret = (float)Math.Atan2(playerTank.Y, playerTank.X);
}
}
}
return(steeringForce / 4);
}
public Vector Execute(Vehicle vehicle)
{
//first find the center of mass of all the agents
Vector CenterOfMass = new Vector(0, 0);
Vector SteeringForce = new Vector(0, 0);
int NeighborCount = 0;
vehicle.gameWorld.GridLogic.CalculateNeighborsEntities(vehicle, vehicle.Radius);
vehicles = vehicle.gameWorld.GridLogic.EntitiesInRange;
//iterate through the neighbors and sum up all the position vectors
for (int i = 0; i < vehicles.Count; i++)
{
//make sure *this* agent isn't included in the calculations and that
//the agent being examined is close enough and of the same type
if (vehicles[i] != vehicle && vehicles[i].GetType().Equals(vehicle.GetType()))
{
CenterOfMass += vehicles[i].Position;
++NeighborCount;
}
}
if (NeighborCount > 0)
{
//the center of mass is the average of the sum of positions
CenterOfMass /= NeighborCount;
//now seek towards that position
SteeringForce = seek.Execute(vehicle, CenterOfMass);
//the magnitude of cohesion is usually much larger than separation or
//allignment so it usually helps to normalize it.
return(SteeringForce.Normalize());
}
return(SteeringForce);
}
