Formatting only
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Sam Tay
parent
f41f8f65bc
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1 changed files with 93 additions and 84 deletions
177
src/Tetris.hs
177
src/Tetris.hs
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@ -80,13 +80,13 @@ initBlock :: Tetrimino -> Block
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initBlock t = Block t startOrigin . fmap (+ startOrigin) . relCells $ t
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relCells :: Tetrimino -> [Coord]
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relCells I = map v2 [(-2,0), (-1,0), (1,0)]
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relCells O = map v2 [(-1,0), (-1,-1), (0,-1)]
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relCells S = map v2 [(-1,-1), (0,-1), (1,0)]
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relCells Z = map v2 [(-1,0), (0,-1), (1,-1)]
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relCells L = map v2 [(-1,-1), (-1,0), (1,0)]
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relCells J = map v2 [(-1,0), (1,0), (1,-1)]
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relCells T = map v2 [(-1,0), (0,-1), (1,0)]
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relCells I = map v2 [(-2, 0), (-1, 0), (1, 0)]
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relCells O = map v2 [(-1, 0), (-1, -1), (0, -1)]
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relCells S = map v2 [(-1, -1), (0, -1), (1, 0)]
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relCells Z = map v2 [(-1, 0), (0, -1), (1, -1)]
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relCells L = map v2 [(-1, -1), (-1, 0), (1, 0)]
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relCells J = map v2 [(-1, 0), (1, 0), (1, -1)]
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relCells T = map v2 [(-1, 0), (0, -1), (1, 0)]
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-- | Visible, active board size
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boardWidth, boardHeight :: Int
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@ -102,15 +102,16 @@ startOrigin = V2 6 22
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-- Safety can only be assured within Game context
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rotate' :: Block -> Block
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rotate' b@(Block s o@(V2 xo yo) cs)
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| s == O = b -- O doesn't need rotation
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| s == I && V2 xo (yo+1) `elem` cs = rotateWith clockwise -- I only has two orientations
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| otherwise = rotateWith counterclockwise
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where
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rotateWith :: (Coord -> Coord) -> Block
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rotateWith dir = b & extra %~ fmap dir
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clockwise = (+ o) . (cwperp) . (subtract o)
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counterclockwise = (+ o) . LV.perp . (subtract o)
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cwperp (V2 x y) = V2 y (-x)
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| -- O doesn't need rotation
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s == O = b
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| -- I only has two orientations
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s == I && V2 xo (yo + 1) `elem` cs = rotateWith clockwise
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| otherwise = rotateWith counterclockwise
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where
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clockwise = (+ o) . (cwperp) . (subtract o)
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counterclockwise = (+ o) . LV.perp . (subtract o)
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rotateWith dir = b & extra %~ fmap dir
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cwperp (V2 x y) = V2 y (-x)
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-- | Get coordinates of entire block
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coords :: Block -> [Coord]
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@ -123,48 +124,48 @@ coords b = b ^. origin : b ^. extra
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-- generates new bag, otherwise just unshifts the first value and returns pair.
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bagFourTetriminoEach :: Seq.Seq Tetrimino -> IO (Tetrimino, Seq.Seq Tetrimino)
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bagFourTetriminoEach = go . Seq.viewl
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where
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go (t :< ts) = pure (t, ts)
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go EmptyL = freshList >>= bagFourTetriminoEach
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freshList = shuffle . Seq.fromList . take 28 . cycle $ [(I)..]
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where
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go (t :< ts) = pure (t, ts)
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go EmptyL = freshList >>= bagFourTetriminoEach
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freshList = shuffle . Seq.fromList . take 28 . cycle $ [(I) ..]
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-- | Initialize a game with a given level
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initGame :: Int -> IO Game
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initGame :: Int -> IO Game
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initGame lvl = do
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(s1, bag1) <- bagFourTetriminoEach mempty
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(s2, bag2) <- bagFourTetriminoEach bag1
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pure $
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Game { _level = lvl
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, _block = initBlock s1
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, _nextShape = s2
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, _nextShapeBag = bag2
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, _score = 0
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, _rowClears = mempty
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, _board = mempty }
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pure $ Game
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{ _level = lvl
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, _block = initBlock s1
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, _nextShape = s2
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, _nextShapeBag = bag2
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, _score = 0
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, _rowClears = mempty
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, _board = mempty
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}
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isGameOver :: Game -> Bool
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isGameOver g = blockStopped g && g ^. block ^. origin == startOrigin
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timeStep :: Game -> IO Game
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timeStep g =
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if blockStopped g
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then nextBlock . updateScore . clearFullRows . freezeBlock $ g
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else pure . gravitate $ g
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timeStep g = if blockStopped g
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then nextBlock . updateScore . clearFullRows . freezeBlock $ g
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else pure . gravitate $ g
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-- TODO check if mapKeysMonotonic works
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clearFullRows :: Game -> Game
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clearFullRows g = g & board %~ clearBoard
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& rowClears %~ (addToRowClears rowCount)
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where
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clearBoard = M.mapKeys shiftCoordAbove . M.filterWithKey notInFullRow
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notInFullRow (V2 _ y) _ = y `notElem` fullRowIndices
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rowCount = length fullRowIndices
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fullRowIndices = filter isFullRow [1..boardHeight]
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isFullRow r = boardWidth == (length . M.filterWithKey (inRow r) $ g ^. board)
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inRow r (V2 _ y) _ = r == y
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shiftCoordAbove (V2 x y) =
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let offset = length . filter (< y) $ fullRowIndices
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in V2 x (y - offset)
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clearFullRows g =
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g & board %~ clearBoard
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& rowClears %~ (addToRowClears rowCount)
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where
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clearBoard = M.mapKeys shiftCoordAbove . M.filterWithKey notInFullRow
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notInFullRow (V2 _ y) _ = y `notElem` fullRowIndices
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rowCount = length fullRowIndices
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fullRowIndices = filter isFullRow [1 .. boardHeight]
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isFullRow r = boardWidth == (length . M.filterWithKey (inRow r) $ g ^. board)
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inRow r (V2 _ y) _ = r == y
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shiftCoordAbove (V2 x y) =
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let offset = length . filter (< y) $ fullRowIndices in V2 x (y - offset)
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-- | This updates game points with respect to the current
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-- _rowClears value (thus should only be used ONCE per step)
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@ -173,13 +174,14 @@ clearFullRows g = g & board %~ clearBoard
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-- more points for back to back clears, right now the scoring is more simple
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updateScore :: Game -> Game
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updateScore g = g & score %~ (+ newPoints)
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where
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newPoints = (1 + g ^. level) * (g ^. rowClears ^. to latestOrZero ^. to points)
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points 0 = 0
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points 1 = 40
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points 2 = 100
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points 3 = 300
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points n = 800
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where
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newPoints =
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(1 + g ^. level) * (g ^. rowClears ^. to latestOrZero ^. to points)
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points 0 = 0
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points 1 = 40
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points 2 = 100
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points 3 = 300
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points n = 800
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-- | Empties row on 0, otherwise appends value (just keeps consecutive information)
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addToRowClears :: Int -> Seq.Seq Int -> Seq.Seq Int
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@ -189,20 +191,22 @@ addToRowClears n rs = rs |> n
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-- | Get last value of sequence or 0 if empty
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latestOrZero :: Seq.Seq Int -> Int
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latestOrZero = go . Seq.viewr
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where go EmptyR = 0
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go (_ :> n) = n
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where
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go EmptyR = 0
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go (_ :> n) = n
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-- | Handle counterclockwise block rotation (if possible)
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-- Allows wallkicks: http://tetris.wikia.com/wiki/TGM_rotation
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rotate :: Game -> Game
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rotate g = g & block .~ nextB
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where nextB = fromMaybe blk $ getFirst . mconcat $ First <$> bs
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bs = map ($ blk) safeFuncs
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safeFuncs = map (mkSafe .) funcs
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mkSafe = boolMaybe (isValidBlockPosition brd)
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funcs = [rotate', rotate' . translate Left, rotate' . translate Right]
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blk = g ^. block
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brd = g ^. board
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where
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nextB = fromMaybe blk $ getFirst . mconcat $ First <$> bs
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bs = map ($ blk) safeFuncs
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safeFuncs = map (mkSafe .) funcs
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mkSafe = boolMaybe (isValidBlockPosition brd)
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funcs = [rotate', rotate' . translate Left, rotate' . translate Right]
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blk = g ^. block
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brd = g ^. board
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blockStopped :: Game -> Bool
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blockStopped g = isStopped (g ^. board) (g ^. block)
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@ -210,45 +214,50 @@ blockStopped g = isStopped (g ^. board) (g ^. block)
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-- | Check if a block on a board is stopped from further gravitation
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isStopped :: Board -> Block -> Bool
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isStopped brd = any cStopped . coords
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where cStopped = (||) <$> inRow1 <*> (`M.member` brd) . (translate Down)
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inRow1 (V2 _ y) = y == 1
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where
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cStopped = (||) <$> inRow1 <*> (`M.member` brd) . (translate Down)
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inRow1 (V2 _ y) = y == 1
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hardDrop :: Game -> Game
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hardDrop g = g & block .~ hardDroppedBlock g
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hardDrop g = g & block .~ hardDroppedBlock g
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hardDroppedBlock :: Game -> Block
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hardDroppedBlock g = translateBy n Down $ g ^. block
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where n = minimum $ (subtract 1) <$> (minY : diffs)
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diffs = [y - yo | (V2 xo yo) <- brdCs, (V2 x y) <- blkCs, xo == x, yo < y]
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brdCs = g ^. board ^. to M.keys
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blkCs = g ^. block ^. to coords
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minY = minimum (fmap (^. _y) blkCs)
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where
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n = minimum $ (subtract 1) <$> (minY : diffs)
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diffs = [ y - yo | (V2 xo yo) <- brdCs, (V2 x y) <- blkCs, xo == x, yo < y ]
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brdCs = g ^. board ^. to M.keys
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blkCs = g ^. block ^. to coords
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minY = minimum (fmap (^. _y) blkCs)
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-- | Freeze current block
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freezeBlock :: Game -> Game
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freezeBlock g = g & board %~ (M.union blkMap)
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where blk = g ^. block
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blkMap = M.fromList $ [(c, blk ^. shape) | c <- blk ^. to coords]
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where
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blk = g ^. block
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blkMap = M.fromList $ [ (c, blk ^. shape) | c <- blk ^. to coords ]
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-- | Replace block with next block
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nextBlock :: Game -> IO Game
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nextBlock g = do
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(t, ts) <- bagFourTetriminoEach (g ^. nextShapeBag)
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pure $
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g & block .~ initBlock (g ^. nextShape)
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& nextShape .~ t
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& nextShapeBag .~ ts
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pure
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$ g
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& block .~ initBlock (g ^. nextShape)
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& nextShape .~ t
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& nextShapeBag .~ ts
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-- | Try to shift current block; if shifting not possible, leave block where it is
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shift :: Direction -> Game -> Game
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shift d g = g & block %~ shiftBlock
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where shiftBlock b = if isValidBlockPosition (g ^. board) (translate d b)
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then translate d b
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else b
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where
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shiftBlock b = if isValidBlockPosition (g ^. board) (translate d b)
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then translate d b
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else b
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-- | Check if coordinate is already occupied or free in board
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isFree, isOccupied :: Board -> Coord -> Bool
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isFree = flip M.notMember
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isFree = flip M.notMember
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isOccupied = flip M.member
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-- | Check if coordinate is in or out of bounds
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@ -270,12 +279,12 @@ isValidBlockPosition brd = all validCoord . coords
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-- | Shuffle a sequence (random permutation)
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shuffle :: Seq.Seq a -> IO (Seq.Seq a)
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shuffle xs
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| null xs = mempty
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| null xs = mempty
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| otherwise = do
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randomPosition <- getStdRandom (randomR (0, length xs - 1))
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let (left, right) = Seq.splitAt randomPosition xs
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(y :< ys) = Seq.viewl right
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fmap (y <|) (shuffle $ left >< ys)
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randomPosition <- getStdRandom (randomR (0, length xs - 1))
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let (left, right) = Seq.splitAt randomPosition xs
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(y :< ys) = Seq.viewl right
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fmap (y <|) (shuffle $ left >< ys)
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-- | Take predicate and input and transform to Maybe
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boolMaybe :: (a -> Bool) -> a -> Maybe a
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