htanks/DefaultPlayer.hs

{-# LANGUAGE DeriveDataTypeable, PatternGuards #-}

module DefaultPlayer ( DefaultPlayer(..)
                     ) where


import qualified Data.Set as S
import Data.Fixed
import Data.Ratio ((%))
import Data.Typeable

import GLDriver
import Player
import Tank


data DefaultPlayer = DefaultPlayer (S.Set Key) Float Float
                     deriving (Typeable, Show)

instance Player DefaultPlayer where
    playerUpdate (DefaultPlayer keys aimx aimy) tank =
        let x = (if (S.member KeyLeft keys) then (-1) else 0) + (if (S.member KeyRight keys) then 1 else 0)
            y = (if (S.member KeyDown keys) then (-1) else 0) + (if (S.member KeyUp keys) then 1 else 0)
            ax = aimx - (fromRational . toRational $ posx tank)
            ay = aimy - (fromRational . toRational $ posy tank)
            move = (x /= 0 || y /= 0)
            angle = if move then Just $ fromRational $ round ((atan2 y x)*1000000*180/pi)%1000000 else Nothing
            aangle = if (ax /= 0 || ay /= 0) then Just $ fromRational $ round ((atan2 ay ax)*1000000*180/pi)%1000000 else Nothing
        in (DefaultPlayer keys aimx aimy, angle, move, aangle)
    
    handleEvent (DefaultPlayer keys aimx aimy) ev
        | Just (KeyPressEvent key)    <- fromEvent ev = DefaultPlayer (S.insert key keys) aimx aimy
        | Just (KeyReleaseEvent key)  <- fromEvent ev = DefaultPlayer (S.delete key keys) aimx aimy
        | Just (MouseMotionEvent x y) <- fromEvent ev = DefaultPlayer keys x y
        | otherwise = DefaultPlayer keys aimx aimy