From 198498b3c604d55d3b54fef34c62f215ba8a2525 Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Tue, 21 Feb 2023 12:40:31 +0000
Subject: New Robot enemy.

---
 src/Game/Entities/Common.hs |  6 +++---
 src/Game/Entities/Pickup.hs |  2 +-
 src/Game/Entities/Robot.hs  | 46 +++++++++++++++++++++++++++++++++++++++++++++
 src/Game/Entities/Slime.hs  |  2 +-
 4 files changed, 51 insertions(+), 5 deletions(-)
 create mode 100644 src/Game/Entities/Robot.hs

(limited to 'src/Game/Entities')

diff --git a/src/Game/Entities/Common.hs b/src/Game/Entities/Common.hs
index f72c33a..2a0c6f1 100644
--- a/src/Game/Entities/Common.hs
+++ b/src/Game/Entities/Common.hs
@@ -28,13 +28,13 @@ frameLimit e = S.frameCount e.sprite (toSpriteSet e.dir)
 -- | Collision detection of player vs entity.
 --
 -- The player's head won't register, this is necessary to avoid hitting things on a platform above when jumping.
-collision :: IORef Entity -> Collision
-collision playerRef other = do
+collision :: IORef Entity -> Int -> Collision
+collision playerRef otherHeight other = do
   player <- readIORef playerRef
   pure $
     player.x + 4 < other.x + 12
       && other.x + 4 < player.x + 12
-      && player.y + 12 < other.y + 16
+      && player.y + otherHeight - 4 < other.y + otherHeight
       && other.y + 4 < player.y + 24
 
 -- | Update game state to reflect that the player was hit by an enemy.
diff --git a/src/Game/Entities/Pickup.hs b/src/Game/Entities/Pickup.hs
index d0f80f6..8d8beb8 100644
--- a/src/Game/Entities/Pickup.hs
+++ b/src/Game/Entities/Pickup.hs
@@ -20,7 +20,7 @@ mkBattery sprites x y playerRef collectedBattery' = do
         gravity = gravityOff,
         dir = DirRight,
         sprite = s,
-        update = updateBattery (collision playerRef) collectedBattery',
+        update = updateBattery (collision playerRef 16) collectedBattery',
         destroy = False,
         spawns = []
       }
diff --git a/src/Game/Entities/Robot.hs b/src/Game/Entities/Robot.hs
new file mode 100644
index 0000000..64c9d48
--- /dev/null
+++ b/src/Game/Entities/Robot.hs
@@ -0,0 +1,46 @@
+module Game.Entities.Robot (mkRobot) where
+
+import Data.Bits (Bits (..))
+import Data.IORef
+import Game.Entities.Common
+import Game.Entities.Const
+import Game.Entities.Types
+import qualified Game.Sprites as S
+
+mkRobot :: S.SpriteSheet -> Int -> Int -> IORef Entity -> IsBlocked -> IO () -> IO Entity
+mkRobot sprites x y playerRef isBlocked hitPlayer' = do
+  s <- S.get sprites "robot"
+  pure
+    Entity
+      { typ = TypeEnemy,
+        x = x,
+        y = y,
+        delay = frameDelay,
+        frame = 0,
+        jumping = False,
+        gravity = gravityOff,
+        dir = DirRight,
+        sprite = s,
+        update = updateRobot (collision playerRef 24) isBlocked hitPlayer',
+        destroy = False,
+        spawns = []
+      }
+
+updateRobot :: Collision -> IsBlocked -> IO () -> Entity -> IO Entity
+updateRobot touchedPlayer isBlocked hitPlayer' e = do
+  touched <- touchedPlayer e
+  let updated = updateFrame True e
+  if touched then fmap (const e) hitPlayer' else pure $ updateMovement updated
+  where
+    updateMovement :: Entity -> Entity
+    updateMovement ent
+      | testBit ent.delay 1 = ent
+      | ent.dir == DirLeft
+          && (isBlocked (ent.x - 1) (ent.y + 17) || isBlocked (ent.x - 1) (ent.y + 17) || not (isBlocked (ent.x - 1) (ent.y + 24))) =
+          ent {dir = DirRight}
+      | ent.dir == DirLeft = ent {x = ent.x - 1}
+      | ent.dir == DirRight
+          && (isBlocked (ent.x + 16) (ent.y + 17) || isBlocked (ent.x + 16) (ent.y + 17) || not (isBlocked (ent.x + 16) (ent.y + 24))) =
+          ent {dir = DirLeft}
+      | ent.dir == DirRight = ent {x = ent.x + 1}
+      | otherwise = ent
diff --git a/src/Game/Entities/Slime.hs b/src/Game/Entities/Slime.hs
index 91e756f..d87f735 100644
--- a/src/Game/Entities/Slime.hs
+++ b/src/Game/Entities/Slime.hs
@@ -21,7 +21,7 @@ mkSlime sprites x y playerRef isBlocked hitPlayer' = do
         gravity = gravityOff,
         dir = DirRight,
         sprite = s,
-        update = updateSlime (collision playerRef) isBlocked hitPlayer',
+        update = updateSlime (collision playerRef 16) isBlocked hitPlayer',
         destroy = False,
         spawns = []
       }
-- 
cgit v1.2.3