50 lines
1.1 KiB
Haskell
50 lines
1.1 KiB
Haskell
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{-# LANGUAGE RecordWildCards #-}
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module Affection.Animation
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( SpriteAnimation(..)
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, runAnimation
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) where
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import Affection.Actor
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import Affection.Types
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import Affection.Property
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import qualified GEGL as G
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import Control.Monad.State
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data SpriteAnimation = SpriteAnimation
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{ sanimCurrentFrame :: Int
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, sanimSprites :: [FilePath]
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, sanimFrameDuration :: Double
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, sanimLoop :: Bool
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, sanimLastChange :: Double
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, sanimPropName :: String
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}
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runAnimation
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:: Ord a
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=> Actor a
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-> SpriteAnimation
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-> Affection us (SpriteAnimation, Actor a)
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runAnimation act anim@SpriteAnimation{..} = do
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ad <- get
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let elapsed = elapsedTime ad
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if elapsed - sanimLastChange > sanimFrameDuration
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then do
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let nframe =
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if sanimCurrentFrame + 1 > length sanimSprites
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then
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if sanimLoop then 1 else sanimCurrentFrame
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else sanimCurrentFrame + 1
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nact =
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updateProperties
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(props $ prop sanimPropName $ sanimSprites !! (nframe - 1))
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act
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return (anim
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{ sanimCurrentFrame = nframe
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, sanimLastChange = elapsed
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}, nact)
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else
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return (anim, act)
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