introduce and propagate view direction

src/Scenes/Test/EventHandler.hs

@@ -25,6 +25,13 @@ singleHandler level event = do
       changeDirection cat state =
           Just cat
           { pcMoveState = if multiplier > 0 then Just state else Nothing
+          , pcViewDirection = if multiplier > 0 && pcGrounded cat
+            then
+              if state == MoveRight
+              then ViewRight
+              else ViewLeft
+            else
+              pcViewDirection cat
           }
   liftIO $ atomically $ modifyTVar (testPlayer level) (\(Just pituicat) ->
     A.log Debug ("Grounded: " <> fromString (show $ pcGrounded pituicat)) $

src/Scenes/Test/Load.hs

@@ -82,6 +82,7 @@ load level progress = do
         tex
         False
         Nothing
+        ViewRight
         []
       oil = PowerUp
         (realToFrac <$> (startpos + V2 200 0))

src/Types/Player.hs

@@ -39,19 +39,23 @@ data Pituicat = Pituicat
   , pcTexture       :: Texture
   , pcGrounded      :: Bool
   , pcMoveState     :: Maybe Action
+  , pcViewDirection :: ViewDirection
   , pcEffects       :: [EffectHolder]
   }
   deriving (Eq, Show)
 
+data ViewDirection = ViewLeft | ViewRight
+  deriving (Eq, Show)
+
 instance Drawable Pituicat where
 
-  toVertices (Pituicat (V2 x y) _ (V2 mx _) _ _ _ _ _ _ _) =
+  toVertices (Pituicat (V2 x y) _ _ _ _ _ _ _ _ vd _) =
     ( V.fromList [0, 1, 2, 2, 3, 0]
     , V.fromList
       [ newVertex
         (V3 (realToFrac x - 25) (realToFrac y - 25) 0)
         (V4 1 1 1 1)
-        (if mx >= 0
+        (if vd == ViewRight
           then V2 0 (1 - 50 / 1024)
           else V2 (50 / 1024) (1 - 50 / 1024)
           )
@@ -59,7 +63,7 @@ instance Drawable Pituicat where
       , newVertex
         (V3 (realToFrac x + 25) (realToFrac y - 25) 0)
         (V4 1 1 1 1)
-        ( if mx >= 0
+        (if vd == ViewRight
           then V2 (50 / 1024) (1 - 50 / 1024)
           else V2 0 (1 - 50 / 1024)
           )
@@ -67,7 +71,7 @@ instance Drawable Pituicat where
       , newVertex
         (V3 (realToFrac x + 25) (realToFrac y + 25) 0)
         (V4 1 1 1 1)
-        (if mx >= 0
+        (if vd == ViewRight
           then V2 (50 / 1024) 1
           else V2 0 1
           )
@@ -75,7 +79,7 @@ instance Drawable Pituicat where
       , newVertex
         (V3 (realToFrac x - 25) (realToFrac y + 25) 0)
         (V4 1 1 1 1)
-        (if mx >= 0
+        (if vd == ViewRight
           then V2 0 1
           else V2 (50 / 1024) 1
           )
@@ -174,10 +178,16 @@ instance Mass Pituicat where
 
 instance Collidible Pituicat where
 
-  boundary _ =
+  boundary cat =
+    if pcViewDirection cat == ViewRight
+    then
       ( V2 (-18) (-25)
       , V2 25 15
       )
+    else
+      ( V2 (-25) (-25)
+      , V2 18 15
+      )
 
   collide cat _ NoCollision = cat
   collide cat other collr@(Collision ddt (V2 dirx diry)) =