nearOne = 0.9999
ballMass = 20
ballMoment = H. momentForCircle ballMass (0, ballRadius) 0
ballRadius = 10
initPos = H.Vector 0 0
initVel = H.Vector 0 0
wallThickness = 1
wallPoints = fmap (uncurry f) [
((-ow2, -oh2), (-ow2, oh2)),
((-ow2, oh2),
(ow2, oh2)),
((ow2, oh2),
(ow2, -oh2)),
((ow2, -oh2),
(-ow2, -oh2))]
where f a b = (g a, g b)
g (a, b) = H.Vector a b
dt :: Double
dt = 0.5
minVel :: Double
minVel = 10
width, height :: Double
height = 500
width = 700
w2, h2 :: Double
h2 = height / 2
w2 = width / 2
ow2, oh2 :: Double
ow2 = w2 - 50
oh2 = h2 - 50
data State = State
{ stateBall
:: H.Body
, stateSpace
:: H.Space
}
ballPos :: State -> StateVar H.Position
ballPos = H. position . stateBall
ballVel :: State -> StateVar H.Velocity
ballVel = H. velocity . stateBall
main = do
H. initChipmunk
initGLFW
state <- newIORef =<< initState
loop state
loop :: IORef State -> IO ()
loop state = do
display state
onMouse state