Continue to refactor zoning to be more stream-based

src/Dodge/Render/Walls.hs

@@ -10,6 +10,7 @@ import ShapePicture
 import Control.Lens
 --import Data.Maybe
 import qualified Control.Foldl as L
+import qualified Streaming.Prelude as S
 --import Data.List
 --import qualified Data.IntMap.Strict as IM
 wallsToDrawStreams
@@ -20,11 +21,14 @@ wallsToDrawStreams cfig w
     = ( wls, wins,spic)
   where
     f wl = (_wlLine wl, _wlColor wl)
-    (wls, wins, spic) = L.fold ((,,)
+    (wls, wins, spic) = runIdentity $ L.purely S.fold_ 
+        ((,,)
         <$> L.prefilter wlOpaqueDraw (L.premap f L.list)
         <*> L.prefilter wlSeeThroughDraw (L.premap f L.list)
         <*> L.premap getWallSPic L.mconcat
-        ) (wallsDoubleScreen cfig w)
+        ) (S.concat $ S.mapMaybe g $ zoneOfSight wallZoneSize w)
+    g (V2 i j) = w ^? wallsZone . znObjects . ix i . ix j
+    
 wlOpaqueDraw :: Wall -> Bool
 wlOpaqueDraw wl = wlIsOpaque wl && _wlDraw wl
 wlSeeThroughDraw :: Wall -> Bool