diff options
Diffstat (limited to 'users/grfn/xanthous/src/Xanthous/Data/EntityMap.hs')
| -rw-r--r-- | users/grfn/xanthous/src/Xanthous/Data/EntityMap.hs | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/users/grfn/xanthous/src/Xanthous/Data/EntityMap.hs b/users/grfn/xanthous/src/Xanthous/Data/EntityMap.hs index d24defa841ab..1d9c4d46cdc9 100644 --- a/users/grfn/xanthous/src/Xanthous/Data/EntityMap.hs +++ b/users/grfn/xanthous/src/Xanthous/Data/EntityMap.hs @@ -20,6 +20,7 @@ module Xanthous.Data.EntityMap , positions , lookup , lookupWithPosition + , positionOf -- , positionedEntities , neighbors , Deduplicate(..) @@ -37,7 +38,7 @@ import Xanthous.Data , Positioned(..) , positioned , Neighbors(..) - , neighborPositions + , neighborPositions, position ) import Xanthous.Data.VectorBag import Xanthous.Orphans () @@ -268,5 +269,9 @@ lookup eid = fmap (view positioned) . lookupWithPosition eid neighbors :: (Ord a, Show a) => Position -> EntityMap a -> Neighbors (VectorBag a) neighbors pos em = (\p -> view (atPosition p) em) <$> neighborPositions pos +-- | Traversal to the position of the entity with the given ID +positionOf :: EntityID -> Traversal' (EntityMap a) Position +positionOf eid = ix eid . position + -------------------------------------------------------------------------------- makeWrapped ''Deduplicate |