affection/examples/example02.hs
2017-03-18 14:12:42 +01:00

121 lines
3.2 KiB
Haskell

{-# 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
, 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
load _ = do
traceM "loading"
root <- G.gegl_node_new
traceM "new root node"
checkerboard <- G.gegl_node_new_child root $ G.checkerboardOperation $
props $ do
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"
buffer <- G.gegl_buffer_new (Just $ G.GeglRectangle 0 0 800 600) =<<
B.babl_format (B.PixelFormat B.RGBA B.CFfloat)
sink <- G.gegl_node_new_child root $ G.Operation "gegl:copy-buffer" $
props $
prop "buffer" buffer
traceM "buffer-sink"
rect <- G.gegl_node_new_child root $ G.Operation "gegl:rectangle" $
props $ do
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
traceM "rect"
crop <- G.gegl_node_new_child root $ G.Operation "gegl:crop" $
props $ do
prop "width" (800::Double)
prop "height" (600::Double)
G.gegl_node_link_many [checkerboard, over, crop, sink]
_ <- G.gegl_node_connect_to rect "output" over "aux"
traceM "connections made"
myMap <- return $ M.fromList
[ ("root" , root)
, ("over" , over)
, ("background" , checkerboard)
, ("sink" , sink)
, ("rect" , rect)
, ("crop" , crop)
]
traceM "loading complete"
return $ UserData
{ nodeGraph = myMap
, foreground = buffer
, lastTick = 0
}
-- drawInit :: Affection UserData ()
-- drawInit = do
-- UserData{..} <- getAffection
-- present (GeglRectangle 0 0 800 600) foreground True
draw :: Affection UserData ()
draw = do
UserData{..} <- getAffection
process (nodeGraph M.! "sink")
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
return ()
traceM $ (show $ 1 / dt) ++ " FPS"
handle :: SDL.EventPayload -> Affection UserData ()
handle (SDL.MouseMotionEvent dat) = do
let (SDL.P (SDL.V2 x y)) = SDL.mouseMotionEventPos dat
ud <- getAffection
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 ()