Stop bullets when they hit walls

src/Dodge/WorldEvent/HitEffect.hs

@@ -51,9 +51,18 @@ mvPt pt = Just $ pt
 
 destroyAt :: Point2 -> Particle -> Maybe Particle
 destroyAt hitp pt = Just $ pt 
+    & ptUpdate .~ killBulletUpdate
     & btTrail' %~ (hitp :)
     & btTimer' %~ (\t -> min 3 (t-1))
 
+killBulletUpdate :: World -> Particle -> (World,Maybe Particle)
+killBulletUpdate w pt 
+    | _btTimer' pt <= 0 = (w,Nothing)
+    | otherwise = (w
+        ,Just $ pt & btTimer' -~ 1
+            & btTrail' %~ (\(x:xs) -> (x:x:xs))
+        )
+
 penWalls 
     :: HitCreatureEffect 
     -> HitWallEffect 

src/Dodge/WorldEvent/ThingsHit.hs

@@ -31,12 +31,13 @@ thingsHit sp ep w
   where 
     hitCrs = IM.elems 
         $ IM.filter (\cr -> circOnSeg sp ep (_crPos cr) (_crRad cr))
-        $ _creatures w
-    --    $ creaturesAlongLine sp ep w
-    crPs     = map (\cr -> ssaTriPoint ep (_crPos cr) sp (_crRad cr)) hitCrs
+    --    $ _creatures w
+        $ creaturesAlongLine sp ep w
+    crPs  = map (\cr -> ssaTriPoint ep (_crPos cr) sp (_crRad cr)) hitCrs
     crs   = zip crPs (map Left hitCrs)
     hitWls   = wallsOnLine sp ep (IM.unions [f b $ f a $ _znObjects $ _wallsZone w | a<-[x-1,x,x+1]
                                                                       , b<-[y-1,y,y+1]])
+    --hitWls = wallsOnLine sp ep $ _walls w
     (x,y) = zoneOfPoint (0.5 *.* (sp +.+ ep))
     f i m = case IM.lookup i m of 
         Just val -> val