From fd63beed174dcbcdcc7fead7d734a53d65d060e1 Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Sat, 4 Feb 2023 22:35:42 +0000
Subject: Go down platforms with A + down

---
 src/Game/Entities.hs | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

(limited to 'src/Game/Entities.hs')

diff --git a/src/Game/Entities.hs b/src/Game/Entities.hs
index 0d37632..1203f55 100644
--- a/src/Game/Entities.hs
+++ b/src/Game/Entities.hs
@@ -81,12 +81,23 @@ updateHorizontal left right e
     gravity = eGravity e
     isGoingDown = gravity == gravityOff || gravity >= gravityDown
 
-updateVertical :: Bool -> Entity -> Entity
-updateVertical jump e
-  | jump && gravity == gravityOff = e {eGravity = gravityUp, eFrame = jumpFrame}
+updateVertical :: Bool -> Bool -> Entity -> Entity
+updateVertical jump down e
+  | gravity /= gravityOff = e
+  | jump && not down = e {eGravity = gravityUp, eFrame = jumpFrame}
+  -- go down a 8 pixel tall platform; not ideal to have these values hardcoded here
+  -- but to be fair, the player height/width is hardcoded as well
+  | jump
+      && down
+      && not (isBlocked (x + 2) (y + 24 + 8))
+      && not (isBlocked (x + 12) (y + 24 + 8)) =
+      applyGravity 8 e {eGravity = gravityDown, eFrame = jumpFrame, eY = eY e + 1}
   | otherwise = e
   where
+    x = eX e
+    y = eY e
     gravity = eGravity e
+    isBlocked = eBlocked e
 
 applyGravity :: Int -> Entity -> Entity
 applyGravity v e
@@ -123,7 +134,7 @@ updatePlayer controls e = do
   ctl <- readIORef controls
   pure $
     updateGravity $
-      updateVertical (C.cA ctl) $
+      updateVertical (C.cA ctl) (C.cDown ctl) $
         updateHorizontal (C.cLeft ctl) (C.cRight ctl) $
           -- left or right, but not both (keyboard)
           updateFrame ((C.cLeft ctl || C.cRight ctl) && (C.cLeft ctl /= C.cRight ctl)) e
-- 
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