From 4993b2ef07ad22f299c60eeec1d96f94cfe4a47c Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <matthias@gamezock.de>
Date: Tue, 9 Mar 2010 06:45:02 +0100
Subject: Reflect bullets at the level border

---
 src/Game.hs   | 16 ++++++++--------
 src/HTanks.hs | 39 ++++++++++++++++++++++++---------------
 2 files changed, 32 insertions(+), 23 deletions(-)

diff --git a/src/Game.hs b/src/Game.hs
index 9aef422..248287b 100644
--- a/src/Game.hs
+++ b/src/Game.hs
@@ -17,13 +17,13 @@ import qualified Data.Map as M
 
 
 data Tank = Tank
-          { tankX            :: !Micro
-          , tankY            :: !Micro
-          , tankDir          :: !Micro
-          , tankAim          :: !Micro
-          , tankSpeed        :: !Micro
-          , tankTurnspeed    :: !Micro
-          , tankMoving       :: !Bool
+          { tankX             :: !Micro
+          , tankY             :: !Micro
+          , tankDir           :: !Micro
+          , tankAim           :: !Micro
+          , tankSpeed         :: !Micro
+          , tankTurnspeed     :: !Micro
+          , tankMoving        :: !Bool
           , tankBulletSpeed   :: !Micro
           , tankBulletBounces :: !Int
           , tankBulletsLeft   :: !Int
@@ -41,7 +41,7 @@ data Bullet = Bullet
 data GameState = GameState
     { level    :: !Level
     , tanks    :: ![Tank]
-    , bullets   :: ![Bullet]
+    , bullets  :: ![Bullet]
     , textures :: !(M.Map Texture TextureObject)
     } deriving (Show)
 
diff --git a/src/HTanks.hs b/src/HTanks.hs
index 4557809..4b66944 100644
--- a/src/HTanks.hs
+++ b/src/HTanks.hs
@@ -147,14 +147,23 @@ updateTank angle move aangle = do
                    modify $ \tank -> tank {tankMoving = False}
 
 
-updateBullet :: State Bullet ()
-updateBullet = do
-  angle <- gets bulletDir >>= return . (/180) . (*pi) . fromRational . toRational
-  speed <- gets bulletSpeed
-  let dx = speed * fromRational (round ((cos angle)*1000)%1000000)
+updateBullet :: GameState -> State Bullet ()
+updateBullet game = do
+  bullet <- get
+  let angle = (fromRational . toRational . bulletDir $ bullet)*pi/180
+      speed = bulletSpeed bullet
+      dx = speed * fromRational (round ((cos angle)*1000)%1000000)
       dy = speed * fromRational (round ((sin angle)*1000)%1000000)
-          
-  modify $ \bullet -> bullet {bulletX = dx + bulletX bullet, bulletY = dy + bulletY bullet}
+      x = dx + bulletX bullet
+      y = dy + bulletY bullet
+      lw = fromIntegral . levelWidth . level $ game
+      lh = fromIntegral . levelHeight . level $ game
+      dir = bulletDir bullet
+      
+      (newx, dir2) = if x < 0 then (-x, (signum dir)*180 - dir) else if x > lw then (2*lw-x, (signum dir)*180 - dir) else (x, dir)
+      (newy, dir3) = if y < 0 then (-y, -dir2) else if y > lh then (2*lh-y, -dir2) else (y, dir2)
+  
+  put bullet {bulletX = newx, bulletY = newy, bulletDir = dir3}
 
 
 simulationStep :: Main ()
@@ -167,17 +176,17 @@ simulationStep = do
       bulletingtanks = map (\(tank, _, n) -> (tank, n)) $ filter (\(tank, bullet, _) -> bullet && (tankBulletsLeft tank) > 0) $ ts
       newtanks = map (\(tank, bullet, _) -> if bullet then tank {tankBulletsLeft = (tankBulletsLeft tank) - 1} else tank) $ ts
       newbullets = map (\(tank, n) -> Bullet
-                                     { bulletX = tankX tank
-                                     , bulletY = tankY tank
-                                     , bulletDir = tankAim tank
-                                     , bulletSpeed = tankBulletSpeed tank
-                                     , bulletBouncesLeft = tankBulletBounces tank
-                                     , bulletTank = n
-                                     }) bulletingtanks
+                                      { bulletX = tankX tank
+                                      , bulletY = tankY tank
+                                      , bulletDir = tankAim tank
+                                      , bulletSpeed = tankBulletSpeed tank
+                                      , bulletBouncesLeft = tankBulletBounces tank
+                                      , bulletTank = n
+                                      }) bulletingtanks
   
   
   modify $ \state -> state {players = p}
-  lift $ modify $ \state -> state {tanks = newtanks, bullets = map (execState updateBullet) (newbullets ++ bullets state)}
+  lift $ modify $ \state -> state {tanks = newtanks, bullets = map (execState $ updateBullet state) (newbullets ++ bullets state)}
     where
       updateTank' (player, tank) = let (p, angle, move, aangle, bullet) = playerUpdate player tank
                                        t = execState (updateTank angle move aangle) tank
-- 
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