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Timer.hs
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Timer.hs
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{-
The MIT License
Copyright (c) 2009 Korcan Hussein
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-}
module Timer (Timer(), defaultTimer, start, stop, getTimerTicks, pause, unpause, isStarted, isPaused) where
import qualified Graphics.UI.SDL.Time as SdlTime
import Data.Word
data Timer = Timer { startTicks :: Word32, pausedTicks :: Word32, paused :: Bool, started :: Bool }
defaultTimer = Timer { startTicks=0, pausedTicks=0, paused=False, started=False }
start :: Timer -> IO Timer
start timer = SdlTime.getTicks >>= \ticks -> return $ timer { startTicks=ticks, started=True,paused=False }
stop :: Timer -> Timer
stop timer = timer { paused=False, started=False }
getTimerTicks :: Timer -> IO Word32
getTimerTicks Timer { started=False } = return 0
getTimerTicks Timer { started=True, paused=True, pausedTicks=pausedTicks' } = return pausedTicks'
getTimerTicks Timer { started=True, paused=False, startTicks=st } = SdlTime.getTicks >>= \currTicks -> return $ currTicks - st
pause :: Timer -> IO Timer
pause timer@Timer { started=True, paused=False, startTicks=st } = SdlTime.getTicks >>= \currTicks -> return $ timer { pausedTicks=(currTicks - st), paused=True, started=True }
pause timer = return timer
unpause :: Timer -> IO Timer
unpause timer@Timer { paused=False } = return timer
unpause timer@Timer { paused=True, pausedTicks=pausedTicks' } =
SdlTime.getTicks >>= \currTicks -> return $ timer { startTicks=(currTicks - pausedTicks'), pausedTicks=0, paused=False }
isStarted :: Timer -> Bool
isStarted Timer { started=s } = s
isPaused :: Timer -> Bool
isPaused Timer { paused=p } = p