public override bool IsActive(Microsoft.Xna.Framework.GameTime gameTime, Levels.Level level)
{
if (Entity.IsDead)
{
return(false);
}
if (Following != null)
{
if (MaxDistance != null)
{
var distance = new Vector2(Following.CenterPosition.X - Entity.CenterPosition.X, Following.CenterPosition.Y - Entity.CenterPosition.Y).Length();
if (distance > MaxDistance)
{
Following.GetBehavior <ChainBehavior <T> >().FollowedBy = null;
Following = null;
}
}
if (Following != null && (Following.IsDead || !level.ContainsEntity(Following)))
{
Following.GetBehavior <ChainBehavior <T> >().FollowedBy = null;
Following = null;
}
}
if (Following == null)
{
Following = (from ent in level.GetEntities <T>()
where ent != Entity && !ent.IsDead && level.ContainsEntity(ent)
let beh = ent.GetBehavior <ChainBehavior <T> >()
where beh != null && beh.FollowedBy == null && !beh.IsFollowingEntity(Entity)
let pos = new Vector2(Entity.CenterPosition.X - ent.CenterPosition.X,
Entity.CenterPosition.Y - ent.CenterPosition.Y)
let distance = pos.Length()
where MaxDistance == null || distance < MaxDistance
orderby distance
select ent).FirstOrDefault();
if (Following != null)
{
Following.GetBehavior <ChainBehavior <T> >().FollowedBy = Entity;
}
}
return(Following != null);
}
