Simplify walk cycle

src/Dodge/Creature/State.hs

@@ -423,7 +423,7 @@ setRBCreatureTargeting cr w ituse
 updateMovement :: Creature -> Creature
 updateMovement cr
     | isFrictionless cr = over crPos (+.+ momentum) cr
-    | otherwise = updateWalkCycle cr
+    | otherwise = cr & crStance %~ updateWalkCycle
   where
     momentum' = 0.98 *.* (_crPos cr -.- _crOldPos cr)
     momentum

src/Dodge/Creature/State/WalkCycle.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE LambdaCase #-}
 module Dodge.Creature.State.WalkCycle (
     updateWalkCycle,
     footstepSideEffect,
@@ -6,36 +7,35 @@ module Dodge.Creature.State.WalkCycle (
 import Control.Lens
 import Dodge.Data.World
 import Dodge.SoundLogic
-import Geometry.Data
 import Sound.Data
 
-updateWalkCycle :: Creature -> Creature
-updateWalkCycle cr = case cr ^? crStance . carriage of
-    Just (Walking x ff) | x > maxStride -> cr & crStance . carriage .~ Walking 0 (normalGait ff)
-    _ -> cr
+updateWalkCycle :: Stance -> Stance
+updateWalkCycle s = case s ^. carriage of
+    Walking x ff | x > maxStride -> s & carriage .~ Walking 0 (normalGait ff)
+    _ -> s
   where
-    maxStride = _strideLength $ _crStance cr
+    maxStride = s ^. strideLength
 
 normalGait :: FootForward -> FootForward
-normalGait LeftForward = RightForward
-normalGait WasLeftForward = RightForward
-normalGait RightForward = LeftForward
-normalGait WasRightForward = LeftForward
+normalGait = \case 
+    LeftForward -> RightForward
+    WasLeftForward -> RightForward
+    RightForward -> LeftForward
+    WasRightForward -> LeftForward
 
 footstepSideEffect :: Creature -> World -> World
-footstepSideEffect cr w = case cr ^? crStance . carriage of
-    Just (Walking x ff) -> makeFootstepSound x maxStride ff (_crPos cr) w
-    _ -> w
+footstepSideEffect cr = case cr ^. crStance . carriage of
+    Walking x ff
+        | x > maxStride ->
+            soundMultiFrom
+                [FootstepSound i | i <- [0 .. 10]]
+                (cr ^. crPos)
+                (chooseFootSound ff)
+                Nothing
+    _ -> id
   where
     maxStride = _strideLength (_crStance cr)
 
-makeFootstepSound :: Int -> Int -> FootForward -> Point2 -> World -> World
-makeFootstepSound currentStride maxStride ff p
-    | currentStride > maxStride = soundMultiFrom footor p (chooseFootSound ff) Nothing
-    | otherwise = id
-  where
-    footor = [FootstepSound 0, FootstepSound 1]
-
 chooseFootSound :: FootForward -> SoundID
 chooseFootSound LeftForward = foot1S
 chooseFootSound _ = foot2S