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module Collision ( collisionTankBorder
, collisionBulletBullet
, collisionBulletTank
) where
import Tank
import Game
import Data.Fixed
import Data.Ratio
tankWidth :: Micro
tankWidth = 0.95
tankLength :: Micro
tankLength = 0.95
bulletDiameter :: Micro
bulletDiameter = 0.05
collisionTankBorder :: Micro -> Micro -> Tank -> Tank
collisionTankBorder lw lh tank = tank {tankX = newx, tankY = newy}
where
dir = (fromRational . toRational . tankDir $ tank)*pi/180
cosd = fromRational (round ((cos dir)*1000000)%1000000)
sind = fromRational (round ((sin dir)*1000000)%1000000)
points = [ (tankLength/2, tankWidth/2)
, (-tankLength/2, tankWidth/2)
, (-tankLength/2, -tankWidth/2)
, (tankLength/2, -tankWidth/2)
]
rotp (x, y) = (cosd*x - sind*y, sind*x + cosd*y)
transp (x, y) = (x + tankX tank, y + tankY tank)
pointst = map (transp . rotp) points
minx = minimum $ map fst pointst
maxx = maximum $ map fst pointst
miny = minimum $ map snd pointst
maxy = maximum $ map snd pointst
dx = if minx < 0 then (-minx) else if maxx > lw then (-maxx+lw) else 0
dy = if miny < 0 then (-miny) else if maxy > lh then (-maxy+lh) else 0
newx = (tankX tank) + dx
newy = (tankY tank) + dy
collisionBulletBullet :: (Bullet, Bullet) -> (Bullet, Bullet) -> Bool
collisionBulletBullet (b1, b1') (b2, b2') = distancesq < (bulletDiameter^2)
where
distancesq = (bulletX b1' - bulletX b2')^2 + (bulletY b1' - bulletY b2')^2
collisionBulletTank :: (Bullet, Bullet) -> (Tank, Tank) -> Bool
collisionBulletTank (b, b') (tank, tank') = (not ((between bx minx maxx) && (between by miny maxy))) && ((between bx' minx maxx) && (between by' miny maxy))
where
between x a b = x >= a && x <= b
dir t = (fromRational . toRational . tankDir $ t)*pi/180
cosd t = fromRational (round ((cos $ dir t)*1000000)%1000000)
sind t = fromRational (round ((sin $ dir t)*1000000)%1000000)
rotp t (x, y) = ((cosd t)*x + (sind t)*y, -(sind t)*x + (cosd t)*y)
transp t (x, y) = (x - tankX t, y - tankY t)
(bx, by) = (rotp tank) . (transp tank) $ (bulletX b, bulletY b)
(bx', by') = (rotp tank') . (transp tank') $ (bulletX b', bulletY b')
minx = -tankLength/2
maxx = tankLength/2
miny = -tankWidth/2
maxy = tankWidth/2
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