48 lines
1.4 KiB
Haskell
48 lines
1.4 KiB
Haskell
{-# LANGUAGE AllowAmbiguousTypes #-}
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{-# LANGUAGE Arrows #-}
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{-# LANGUAGE RankNTypes #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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module Graphics.Engine where
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import Control.Arrow
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import Control.Monad.Representable.Reader
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import FRP.Yampa
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import GOL.Engine
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import GOL.Rule
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import GOL.Space
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import Graphics.Config
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import Graphics.Display (drawGrid)
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import Graphics.Gloss
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import Graphics.Gloss.Interface.IO.Game hiding (Event)
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import qualified Graphics.Gloss.Interface.IO.Game as G
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import Graphics.GlossUtils (InputEvent)
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type TickEvent = Event ()
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initialSpace :: Space f => f Bool
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initialSpace = tabulate $ const False
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engine :: Space f => GOL f Bool -> SF TickEvent (GOL f Bool)
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engine = accumHoldBy (\s _ -> tick s)
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repeatTick :: Time -> SF a TickEvent
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repeatTick t = repeatedly t ()
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tickSignal :: SF (Event Time) TickEvent
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tickSignal =
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arr (\ev -> ((), fmap repeatTick ev))
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>>> drSwitch (repeatTick 0.2)
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processEvent :: G.Event -> Config -> Config
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processEvent (EventKey (Char '-') Down _ _) c = c {tickPeriod = tickPeriod c * 0.8}
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processEvent (EventResize s) c = c {windowSize = s}
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processEvent _ c = c
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run :: forall f. DisplayableSpace f => f Bool -> SF InputEvent Picture
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run st = proc ev -> do
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c <- accum defaultConfig -< fmap processEvent ev
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c' <- hold defaultConfig -< c
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t <- tickSignal -< fmap tickPeriod c
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s <- engine (gol' standardRule st) -< t
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identity -< drawGrid c' (getSpace s) |