/// <summary>Finds the closest friendly station and moves to it, if we're close enough we dock (delete the instance).</summary>
/// <returns>Whether to do the rest of the update.</returns>
protected override bool UpdateInternal()
{
// See if there are any stations nearby.
var faction = ((Faction)AI.Manager.GetComponent(AI.Entity, Faction.TypeId)).Value;
var position = ((ITransform)AI.Manager.GetComponent(AI.Entity, TransformTypeId)).Position;
var index = (IndexSystem)AI.Manager.GetSystem(IndexSystem.TypeId);
// The closest station we were able to find and how far it is away.
var closestStation = 0;
var distanceSquared = float.MaxValue;
ISet <int> neighbors = new HashSet <int>();
index[Detectable.IndexId].Find(position, ScanRange, neighbors);
foreach (IIndexable neighbor in neighbors.Select(AI.Manager.GetComponentById))
{
// See if it's a station.
// TODO...
// Friend or foe?
var neighborFaction = ((Faction)AI.Manager.GetComponent(neighbor.Entity, Faction.TypeId));
if (neighborFaction != null && (neighborFaction.Value & faction) != 0)
{
// Friend. Closer than any other?
var neighborPosition = ((ITransform)AI.Manager.GetComponent(neighbor.Entity, TransformTypeId)).Position;
var neighborDistanceSquared = FarPosition.DistanceSquared(position, neighborPosition);
if (neighborDistanceSquared < distanceSquared)
{
distanceSquared = neighborDistanceSquared;
closestStation = neighbor.Entity;
}
}
}
// Do we have a closest station?
if (closestStation > 0)
{
var neighborPosition =
((ITransform)AI.Manager.GetComponent(closestStation, TransformTypeId)).Position;
// Close enough to dock?
if (FarPosition.DistanceSquared(position, neighborPosition) < DockingRange * DockingRange)
{
// Yes! Kill ourselves.
// TODO: display some particle effects to hint we're docking.
AI.Manager.RemoveEntity(AI.Entity);
}
else
{
// No. Let's try to get there.
AI.AttackMove(ref neighborPosition);
}
}
// We never have anything else to do anyway.
return(false);
}
/// <summary>Check if we reached our target.</summary>
/// <returns>Whether to do the rest of the update.</returns>
protected override bool UpdateInternal()
{
var position = ((ITransform)AI.Manager.GetComponent(AI.Entity, TransformTypeId)).Position;
if (FarPosition.DistanceSquared(position, Target) < ReachedEpsilon * ReachedEpsilon)
{
// We have reached our target, pop self.
AI.PopBehavior();
return(false);
}
return(true);
}
/// <summary>Behavior specific update logic, e.g. checking for nearby enemies.</summary>
/// <returns>Whether to do the rest of the update.</returns>
protected override bool UpdateInternal()
{
// Get our ship control.
var control = ((ShipControl)AI.Manager.GetComponent(AI.Entity, ShipControl.TypeId));
// If our target died, we're done here.
if (!AI.Manager.HasEntity(Target))
{
control.Shooting = false;
_start = null;
AI.PopBehavior();
return(false);
}
// Get our position.
var position = ((ITransform)AI.Manager.GetComponent(AI.Entity, TransformTypeId)).Position;
// Check if we've traveled too far.
if (_start.HasValue)
{
if (FarPosition.DistanceSquared(_start.Value, position) >
AI.Configuration.ChaseDistance * AI.Configuration.ChaseDistance)
{
// Yeah, that's it, let's give up and return to what we
// were doing before.
control.Shooting = false;
_start = null;
AI.PopBehavior();
return(false);
}
}
else
{
// Not set yet, do it now.
_start = position;
}
// Get our ship info.
var info = (ShipInfo)AI.Manager.GetComponent(AI.Entity, ShipInfo.TypeId);
// Target still lives, see how far away it is.
var targetPosition = ((ITransform)AI.Manager.GetComponent(Target, TransformTypeId)).Position;
var toTarget = (Vector2)(targetPosition - position);
var targetAngle = (float)Math.Atan2(toTarget.Y, toTarget.X);
var weaponRange = info.WeaponRange + AI.Configuration.WeaponRangeEpsilon;
// If we're close enough and the target is somewhat in front of us, open fire.
control.Shooting = (toTarget.LengthSquared() < weaponRange * weaponRange) &&
Math.Abs(Angle.MinAngle(targetAngle, info.Rotation)) <
AI.Configuration.WeaponFiringAngle * 0.5f;
// If we're in a squad we want the other members to help us.
var squad = (Squad)AI.Manager.GetComponent(AI.Entity, Squad.TypeId);
if (squad != null)
{
foreach (var member in squad.Members)
{
// Skip self, we're already busy.
if (member == AI.Entity)
{
continue;
}
var ai = (ArtificialIntelligence)AI.Manager.GetComponent(member, ArtificialIntelligence.TypeId);
if (ai != null && ai.CurrentBehavior != ArtificialIntelligence.BehaviorType.Attack)
{
ai.Attack(Target);
}
}
}
// All OK.
return(true);
}