affection/examples/example02.hs

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{-# LANGUAGE RecordWildCards #-}
import Affection
import qualified SDL
import qualified GEGL as G
import qualified BABL as B
import qualified Data.Map.Strict as M
import Foreign.C.Types
import Debug.Trace
main :: IO ()
main = do
conf <- return $ AffectionConfig
{ initComponents = All
, windowTitle = "Affection: example00"
, windowConfig = SDL.defaultWindow
, preLoop = drawInit
, drawLoop = draw
, updateLoop = update
, loadState = load
, cleanUp = clean
}
withAffection conf
data UserData = UserData
{ nodeGraph :: M.Map String G.GeglNode
, foreground :: G.GeglBuffer
, coordinates :: Maybe (Int, Int)
}
load :: SDL.Surface -> IO UserData
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load _ = do
traceM "loading"
root <- G.gegl_node_new
traceM "new root node"
checkerboard <- G.gegl_node_new_child root $ G.checkerboardOperation
[ G.Property "color1" $ G.PropertyColor $ G.RGBA 0.4 0.4 0.4 1
, G.Property "color2" $ G.PropertyColor $ G.RGBA 0.6 0.6 0.6 1
]
traceM "checkerboard"
over <- G.gegl_node_new_child root G.defaultOverOperation
traceM "over"
buffer <- G.gegl_buffer_new (G.GeglRectangle 0 0 800 600) =<<
B.babl_format (B.PixelFormat B.RGBA B.CFfloat)
bufsrc <- G.gegl_node_new_child root $ G.bufferSourceOperation
[ G.Property "buffer" $ G.PropertyBuffer buffer
]
traceM "buffer-source"
G.gegl_node_link checkerboard over
G.gegl_node_connect_to bufsrc "output" over "aux"
traceM "connections made"
myMap <- return $ M.fromList
[ ("root" , root)
, ("over" , over)
, ("background" , checkerboard)
, ("foreground" , bufsrc)
]
traceM "loading complete"
return $ UserData
{ nodeGraph = myMap
, foreground = buffer
, coordinates = Nothing
}
drawInit :: Affection UserData ()
drawInit = do
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UserData{..} <- getAffection
present (nodeGraph M.! "over") foreground (GeglRectangle 0 0 800 600) True
draw :: Affection UserData ()
draw = do
traceM "drawing"
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ad <- get
UserData{..} <- getAffection
SDL.V2 (CInt rw) (CInt rh) <- SDL.surfaceDimensions $ drawSurface ad
let (w, h) = (fromIntegral rw, fromIntegral rh)
liftIO $ clearArea foreground (GeglRectangle 0 0 w h)
maybe (return ()) (\(x, y) ->
drawRect
foreground
(nodeGraph M.! "over")
(G.RGBA 1 0 0 0.5)
(Line 7)
(G.GeglRectangle (x - 10) (y - 10) 20 20)
) coordinates
update :: Double -> AffectionState (AffectionData UserData) IO ()
update sec = do
traceM "updating"
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ad <- get
ud <- getAffection
traceM $ (show $ 1 / sec) ++ " FPS"
ev <- liftIO $ SDL.pollEvent
maybe (return ()) (\e ->
case SDL.eventPayload e of
SDL.MouseMotionEvent dat -> do
let (SDL.P (SDL.V2 x y)) = SDL.mouseMotionEventPos dat
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putAffection $ ud
{ coordinates = Just (fromIntegral x, fromIntegral y)
}
SDL.WindowClosedEvent _ -> do
traceM "seeya!"
put $ ad
{ quitEvent = True
}
_ ->
return ()
) ev
clean :: UserData -> IO ()
clean _ = return ()