#3 #2 Player render and movement

lib/RPGEngine/Data.hs

@@ -7,7 +7,8 @@ data Game = Game {
     -- Current state of the game
     state   :: State,
     playing :: Level,
-    levels  :: [Level]
+    levels  :: [Level],
+    player  :: Player
 }
 
 ------------------------------- Level --------------------------------
@@ -30,9 +31,13 @@ data Physical = Void
 
 ------------------------------- Player -------------------------------
 
+type X = Int
+type Y = Int
+
 data Player = Player {
     playerHp  :: Maybe Int,
-    inventory :: [Item]
+    inventory :: [Item],
+    coord     :: (X, Y)
 } deriving (Eq, Show)
 
 instance Living Player where

lib/RPGEngine/Data/Defaults.hs

@@ -18,9 +18,10 @@ defaultEntity = Entity {
 -- Initialize the game
 initGame :: Game
 initGame = Game { 
-    state = defaultState,
+    state   = defaultState,
     playing = defaultLevel,
-    levels = [defaultLevel]
+    levels  = [defaultLevel],
+    player  = defaultPlayer
 }
 
 defaultItem :: Item
@@ -51,8 +52,9 @@ defaultLevel = Level {
 
 defaultPlayer :: Player
 defaultPlayer = Player {
-    playerHp = Prelude.Nothing, -- Compares to infinity
-    inventory = []
+    playerHp  = Prelude.Nothing, -- Compares to infinity
+    inventory = [],
+    coord     = (0, 0)
 }
 
 -- Default state of the game, Menu

lib/RPGEngine/Input.hs

@@ -7,6 +7,7 @@ module RPGEngine.Input
 import RPGEngine.Data
 import RPGEngine.Data.State
 import RPGEngine.Input.Core
+import RPGEngine.Input.Player
 
 import Graphics.Gloss.Interface.IO.Game
 
@@ -22,7 +23,19 @@ handleAllInput ev g                         = handleAnyKey setNextState ev g
 -- Input for 'Playing' state
 handlePlayInputs :: InputHandler Game
 handlePlayInputs = composeInputHandlers [
-    handleKey (Char 'p') (\game -> game{ state = Pause })
+    -- Pause the game
+    handleKey (Char 'p') (\game -> game{ state = Pause }),
+
+    -- Player movement
+    handleKey (SpecialKey KeyUp)    $ movePlayer North,
+    handleKey (SpecialKey KeyRight) $ movePlayer East,
+    handleKey (SpecialKey KeyDown)  $ movePlayer South,
+    handleKey (SpecialKey KeyLeft)  $ movePlayer West,
+
+    handleKey (Char 'w') $ movePlayer North,
+    handleKey (Char 'd') $ movePlayer East,
+    handleKey (Char 's') $ movePlayer South,
+    handleKey (Char 'a') $ movePlayer West
     ]
 
 -- Go to the next stage of the Game

lib/RPGEngine/Input/Player.hs

@@ -0,0 +1,19 @@
+module RPGEngine.Input.Player 
+( movePlayer
+) where
+
+import RPGEngine.Data (Game(..), Direction(..), Player(..), X, Y)
+
+movePlayer :: Direction -> Game -> Game
+movePlayer dir g@Game{ player = p@Player{ coord = (x, y) }} = newGame
+    where newGame   = g{ player = newPlayer }
+          newPlayer = p{ coord  = newCoord  }
+          newCoord  = (x + xD, y + yD)
+          (xD, yD)  = diffs dir
+
+diffs :: Direction -> (X, Y)
+diffs North  = (0, 1)
+diffs East   = (1, 0)
+diffs South  = (0, -1)
+diffs West   = (-1, 0)
+diffs Center = (0, 0)

lib/RPGEngine/Render.hs

@@ -8,7 +8,15 @@ module RPGEngine.Render
 ) where
 
 import RPGEngine.Data
+    ( State(..),
+      Game(..) )
+import RPGEngine.Render.Level 
+    ( renderLevel )
+
 import Graphics.Gloss
+    ( white, pictures, text, Display(InWindow), Color, Picture )
+import RPGEngine.Render.Player (renderPlayer)
+import RPGEngine.Render.GUI (renderGUI)
 
 ----------------------------- Constants ------------------------------
 
@@ -36,9 +44,12 @@ render g@Game{ state = Lose    } = renderLose g
 renderMenu :: Game -> Picture
 renderMenu _ = text "[Press any key to start]"
 
--- TODO
 renderPlaying :: Game -> Picture
-renderPlaying _ = text "Playing"
+renderPlaying g@Game{ playing = lvl, player = player } = pictures [
+    renderLevel lvl,
+    renderPlayer player,
+    renderGUI g
+    ]
 
 -- TODO
 renderPause :: Game -> Picture

lib/RPGEngine/Render/Core.hs

@@ -0,0 +1,63 @@
+module RPGEngine.Render.Core where
+
+import Graphics.Gloss ( Picture, translate )
+import GHC.IO (unsafePerformIO)
+import Graphics.Gloss.Juicy (loadJuicyPNG)
+import Data.Maybe (fromJust)
+import Graphics.Gloss.Data.Picture (scale)
+
+----------------------------- Constants ------------------------------
+
+-- Default scale
+zoom :: Float
+zoom = 5.0
+
+-- Resolution of the texture
+resolution :: Float
+resolution = 16
+
+assetsFolder :: FilePath
+assetsFolder = "assets/"
+
+unknownImage :: FilePath
+unknownImage = "unkown.png"
+
+allEntities :: [(String, FilePath)]
+allEntities = [
+    ("player", "player.png"),
+    ("door", "door.png")
+    ]
+
+allItems :: [(String, FilePath)]
+allItems = [
+    ("dagger", "dagger.png"),
+    ("key",    "key.png"   )
+    ]
+
+-- Map of all renders
+library :: [(String, Picture)]
+library = unknown:entities ++ environment ++ gui ++ items
+    where unknown     = ("unkown", renderPNG (assetsFolder ++ unknownImage))
+          entities    = map (\(f, s) -> (f, renderPNG (assetsFolder ++ "entities/" ++ s))) allEntities
+          environment = []
+          gui         = []
+          items       = map (\(f, s) -> (f, renderPNG (assetsFolder ++ "items/" ++ s))) allItems
+
+----------------------------------------------------------------------
+
+-- Turn a path to a .png file into a Picture.
+renderPNG :: FilePath -> Picture
+renderPNG path = scale zoom zoom $ fromJust $ unsafePerformIO $ loadJuicyPNG path
+
+-- Retrieve an image from the library. If the library does not contain
+-- the requested image, a default is returned.
+getRender :: String -> Picture
+getRender id = get filtered
+    where filtered         = filter ((== id) . fst) library
+          get []           = snd $ head library
+          get ((_, res):_) = res
+
+setRenderPos :: Int -> Int -> Picture -> Picture
+setRenderPos x y = translate floatX floatY
+    where floatX = fromIntegral x * zoom * resolution
+          floatY = fromIntegral y * zoom * resolution

lib/RPGEngine/Render/GUI.hs

@@ -0,0 +1,10 @@
+module RPGEngine.Render.GUI 
+( renderGUI
+) where
+
+import RPGEngine.Data (Game)
+import Graphics.Gloss (Picture, blank)
+
+-- TODO
+renderGUI :: Game -> Picture
+renderGUI _ = blank

lib/RPGEngine/Render/Level.hs

@@ -0,0 +1,10 @@
+module RPGEngine.Render.Level 
+( renderLevel
+) where
+
+import Graphics.Gloss
+import RPGEngine.Data
+
+-- TODO
+renderLevel :: Level -> Picture
+renderLevel _ = text "Level"

lib/RPGEngine/Render/Player.hs

@@ -0,0 +1,11 @@
+module RPGEngine.Render.Player 
+( renderPlayer
+) where
+
+import RPGEngine.Data (Player(..))
+
+import Graphics.Gloss (Picture, text)
+import RPGEngine.Render.Core (getRender, setRenderPos)
+
+renderPlayer :: Player -> Picture
+renderPlayer Player{ coord = (x, y) } = setRenderPos x y $ getRender "player"

rpg-engine.cabal

@@ -19,6 +19,7 @@ library
 
     RPGEngine.Input
     RPGEngine.Input.Core
+    RPGEngine.Input.Player
 
     RPGEngine.Parse
     RPGEngine.Parse.Core
@@ -26,6 +27,10 @@ library
     RPGEngine.Parse.StructElement
 
     RPGEngine.Render
+    RPGEngine.Render.Core
+    RPGEngine.Render.GUI
+    RPGEngine.Render.Level
+    RPGEngine.Render.Player
 
 executable rpg-engine
   main-is: Main.hs