pituicat/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 Debug.Trace
main :: IO ()
main = do
conf <- return $ AffectionConfig
{ initComponents = All
, windowTitle = "Affection: example00"
, windowConfig = SDL.defaultWindow
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, preLoop = return ()
, eventLoop = handle
, updateLoop = update
, drawLoop = draw
, loadState = load
, cleanUp = clean
}
withAffection conf
data UserData = UserData
{ nodeGraph :: M.Map String G.GeglNode
, foreground :: G.GeglBuffer
, lastTick :: Double
}
load :: SDL.Surface -> IO UserData
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load _ = do
traceM "loading"
root <- G.gegl_node_new
traceM "new root node"
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checkerboard <- G.gegl_node_new_child root $ G.checkerboardOperation $
props $ do
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prop "color1" $ G.RGBA 0.4 0.4 0.4 1
prop "color2" $ G.RGBA 0.6 0.6 0.6 1
traceM "checkerboard"
over <- G.gegl_node_new_child root G.defaultOverOperation
traceM "over"
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buffer <- G.gegl_buffer_new (Just $ G.GeglRectangle 0 0 800 600) =<<
B.babl_format (B.PixelFormat B.RGBA B.CFfloat)
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sink <- G.gegl_node_new_child root $ G.Operation "gegl:copy-buffer" $
props $
prop "buffer" buffer
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traceM "buffer-sink"
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rect <- G.gegl_node_new_child root $ G.Operation "gegl:rectangle" $
props $ do
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prop "x" (0::Double)
prop "y" (0::Double)
prop "width" (20::Double)
prop "height" (20::Double)
prop "color" $ G.RGBA 1 0 0 0.5
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traceM "rect"
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crop <- G.gegl_node_new_child root $ G.Operation "gegl:crop" $
props $ do
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prop "width" (800::Double)
prop "height" (600::Double)
G.gegl_node_link_many [checkerboard, over, crop, sink]
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_ <- G.gegl_node_connect_to rect "output" over "aux"
traceM "connections made"
myMap <- return $ M.fromList
[ ("root" , root)
, ("over" , over)
, ("background" , checkerboard)
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, ("sink" , sink)
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, ("rect" , rect)
, ("crop" , crop)
]
traceM "loading complete"
return $ UserData
{ nodeGraph = myMap
, foreground = buffer
, lastTick = 0
}
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-- drawInit :: Affection UserData ()
-- drawInit = do
-- UserData{..} <- getAffection
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-- present (GeglRectangle 0 0 800 600) foreground True
draw :: Affection UserData ()
draw = do
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UserData{..} <- getAffection
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process (nodeGraph M.! "sink")
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present (GeglRectangle 0 0 800 600) foreground True
update :: Affection UserData ()
update = do
traceM "updating"
tick <- getTick
ud <- getAffection
putAffection $ ud { lastTick = tick }
let dt = tick - lastTick ud
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return ()
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traceM $ (show $ 1 / dt) ++ " FPS"
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handle :: SDL.EventPayload -> Affection UserData ()
handle (SDL.MouseMotionEvent dat) = do
let (SDL.P (SDL.V2 x y)) = SDL.mouseMotionEventPos dat
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ud <- getAffection
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liftIO $ G.gegl_node_set (nodeGraph ud M.! "rect") $ G.Operation "" $
props $ do
prop "x" (fromIntegral (x - 10) :: Double)
prop "y" $ (fromIntegral (y - 10) :: Double)
handle (SDL.WindowClosedEvent _) = do
traceM "seeya!"
quit
handle _ =
return ()
clean :: UserData -> IO ()
clean _ = return ()