private void DoTracking(float frameTime)
{
// not valid entity to target.
if (_curTarget == null || !_curTarget.IsValid())
{
_curTarget = null;
return;
}
// point me at the target
var tarPos = _curTarget.GetComponent <ITransformComponent>().WorldPosition;
var selfTransform = SelfEntity.GetComponent <ITransformComponent>();
var myPos = selfTransform.WorldPosition;
var curDir = selfTransform.LocalRotation.ToVec();
var tarDir = (tarPos - myPos).Normalized;
var fwdAng = Vector2.Dot(curDir, tarDir);
Vector2 newDir;
if (fwdAng < 0) // target behind turret, just rotate in a direction to get target in front
{
var curRight = new Vector2(-curDir.Y, curDir.X); // right handed coord system
var rightAngle = Vector2.Dot(curDir, new Vector2(-tarDir.Y, tarDir.X)); // right handed coord system
var rotateSign = -Math.Sign(rightAngle);
newDir = curDir + curRight * rotateSign * MaxAngSpeed * frameTime;
}
else // target in front, adjust to aim at him
{
newDir = MoveTowards(curDir, tarDir, MaxAngSpeed, frameTime);
}
selfTransform.LocalRotation = new Angle(newDir);
if (fwdAng > -0.9999)
{
// TODO: shoot gun, prob need aimbot because entity rotation lags behind moving target
}
}
private IEntity FindBestTarget()
{
// "best" target is the closest one with LOS
var ents = _entMan.GetEntitiesInRange(SelfEntity, VisionRadius);
var myTransform = SelfEntity.GetComponent <IServerTransformComponent>();
var maxRayLen = VisionRadius * 2.5f; // circle inscribed in square, square diagonal = 2*r*sqrt(2)
_workList.Clear();
foreach (var entity in ents)
{
// filter to "people" entities (entities with controllers)
if (!entity.HasComponent <IMoverComponent>())
{
continue;
}
// build the ray
var dir = entity.GetComponent <TransformComponent>().WorldPosition - myTransform.WorldPosition;
var ray = new Ray(myTransform.WorldPosition, dir.Normalized);
// cast the ray
var result = _physMan.IntersectRay(ray, maxRayLen);
// add to visible list
if (result.HitEntity == entity)
{
_workList.Add(entity);
}
}
// get closest entity in list
var closestEnt = GetClosest(myTransform.WorldPosition, _workList);
// return closest
return(closestEnt);
}