public static void Add(Entity entity)
{
if (!isUpdating)
AddEntity(entity);
else
addedEntities.Add(entity);
}
private static void AddEntity(Entity entity)
{
entities.Add(entity);
if (entity is Bullet)
bullets.Add(entity as Bullet);
else if (entity is Enemy)
enemies.Add(entity as Enemy);
else if (entity is BlackHole)
blackHoles.Add(entity as BlackHole);
}
private static bool IsColliding(Entity a, Entity b)
{
float radius = a.Radius + b.Radius;
return !a.IsExpired && !b.IsExpired && Vector2.DistanceSquared(a.Position, b.Position) < radius * radius;
}