affection/src/Affection/Particle.hs

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{-# LANGUAGE RecordWildCards #-}
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{-# LANGUAGE BangPatterns #-}
-- | This module introduces a simple particle system to Affection
module Affection.Particle
( updateParticle
, drawParticles
, updateParticleSystem
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, insertParticle
) where
import Affection.Types
import Control.Monad
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import Control.Monad.State (get)
import Data.Maybe
import qualified GEGL as G
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import Debug.Trace
-- This function updates particles through a specified function. Particle ageing
-- and death is being handled by 'updateParticles' itself and does not need to
-- bother you.
updateParticle
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:: Double
-- ^ Elapsed time in seconds
-> (Double -> Particle -> Affection us Particle)
-- ^ Update function for a single 'Particle'
-- This Function should take the elapsed time
-- in seconds and the initial particle as arguments.
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-- -> [Maybe Particle]
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-> Particle
-- ^ 'Particle' to be processed
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-- -> Affection us [Maybe Particle]
-> Affection us (Maybe Particle)
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-- ^ resulting 'Particle'
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updateParticle time funct pa =
do
now <- elapsedTime <$> get
if particleCreation pa + particleTimeToLive pa < now
then do
mproducer <- liftIO $ G.gegl_node_get_producer
(particleStackCont pa)
"input"
case mproducer of
Just (producer, padname) -> do
consumers <- liftIO $ G.gegl_node_get_consumers
(particleStackCont pa)
"output"
liftIO $ mapM_ (\(node, inpad)-> G.gegl_node_connect_to
producer
padname
node
inpad
) consumers
Nothing -> return ()
liftIO $ G.gegl_node_drop $ particleRootNode pa
return $ Nothing
else do
np <- Just <$> funct time pa
return $ np
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-- | Get the next living particle from a list
nextLiving
:: [Maybe Particle]
-> Maybe Particle
nextLiving [] = Nothing
nextLiving acc = case catMaybes acc of
[] -> Nothing
ps -> Just $ head $ ps
-- if isNothing p
-- then nextLiving ps
-- else p
drawParticles
:: (Particle -> Affection us ())
-> [Particle]
-> Affection us ()
drawParticles = mapM_
updateParticleSystem
:: ParticleSystem
-> Double
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-> (Double -> Particle -> Affection us Particle)
-> (G.GeglBuffer -> G.GeglNode -> Particle -> Affection us ())
-> Affection us ParticleSystem
updateParticleSystem sys sec upd draw = do
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!x <- catMaybes <$> mapM (updateParticle sec upd) (partStorList $ partSysParts sys)
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-- liftIO $ traceIO $ show $ length x
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-- x <- catMaybes <$> foldM (updateParticle sec upd) [] (reverse $ psParts sys)
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if (not $ null x)
then do
-- liftIO $ G.gegl_node_link_many $ map particleStackCont (partStorList $ partSysParts sys)
-- liftIO $ traceIO "linking last node to output"
liftIO $ G.gegl_node_link (particleStackCont $ head x) (partSysNode sys)
mapM_ (draw (partSysBuffer sys) (partSysNode sys)) x
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return sys
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{ partSysParts = (partSysParts sys)
{ partStorList = x
}
}
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else do
_ <- liftIO $ G.gegl_node_disconnect (partSysNode sys) "input"
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return sys
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{ partSysParts = ParticleStorage
{ partStorList = []
, partStorLatest = Nothing
}
}
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-- | Function for inserting a new 'Particle' into its 'PartileSystem'
insertParticle
:: ParticleSystem -- ^ 'ParticleSystem' to insert into
-> Particle -- ^ 'Particle' to insert
-> Affection us ParticleSystem -- ^ resulting new 'ParticleSystem'
insertParticle ps p = do
now <- elapsedTime <$> get
let newList = chronoInsert now (partStorList $ partSysParts ps) p
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liftIO $ G.gegl_node_link_many (reverse $ map particleStackCont newList)
-- when (not $ isNothing $ partStorLatest $ partSysParts ps) $
-- liftIO $ G.gegl_node_link
-- (particleStackCont p)
-- (particleStackCont $ fromJust $ partStorLatest $ partSysParts ps)
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return $ ps
{ partSysParts = (partSysParts ps)
{ partStorLatest = Just p
, partStorList = newList
}
}
-- | Insert a 'Particle' into its chronologically ordered list
chronoInsert
:: Double -- ^ Time in seconds from beginning of program execution
-> [Particle] -- ^ List to insert to
-> Particle -- ^ 'Particle' to insert
-> [Particle] -- ^ Resulting list
chronoInsert now [] np = [np]
chronoInsert now [p] np =
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if now + particleTimeToLive p < (particleCreation np + particleTimeToLive np)
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then p : [np]
else np : [p]
chronoInsert now l@(p:ps) np =
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if now + particleTimeToLive p < (particleCreation np + particleTimeToLive np)
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then p : chronoInsert now ps np
else np : l