Jonathan Cast
On 4 Jan 2008, at 2:00 AM, Nicholls, Mark wrote:
You may be right...but learning is not an atomic thing....wherever I start I will get strange things happening.
The best place to start learning Haskell is with the simplest type features, not the most complicated. And it's the simplest features that are most unlike OO.
Yes, Haskell will be `strange'. But if you think you're `the intersection' between Haskell and OO, you'll think things are familiar, and you'll be surprised when they turn out to be different. I'd concentrate on watching out for differences --- but then I can't imagine how finding `familiar' ideas would help.
just a sec... things like data State = State { winSize :: IORef Size , t :: IORef Int , fps :: IORef Float , showFPS :: IORef Bool , showHelp :: IORef Bool , grabMouse :: IORef Bool , mousePos :: IORef (Maybe Position) , mouseDelta :: IORef Position , viewRot :: IORef Vec3 , angle' :: IORef GLfloat , ballPos :: IORef Vec2 , ballVel :: IORef Vec2 } makeState :: IO State makeState = do size <- newIORef $ Size 0 0 t' <- newIORef 0 fps' <- newIORef 0 sfps <- newIORef False gm <- newIORef False mp <- newIORef Nothing md <- newIORef $ Position 0 0 sh <- newIORef False v <- newIORef (0, 0, 0) a <- newIORef 0 bp <- newIORef (0, 0) bv <- newIORef (0.002, 0.002) { winSize = size , t = t', fps = fps' , showFPS = sfps, showHelp = sh , grabMouse = gm, mousePos = mp, mouseDelta = md , viewRot = v, angle' = a , ballPos = bp, ballVel = bv } and keyboard state (Char 'f') Down _ _ = showFPS state $~ not modRot :: State -> View -> IO () modRot state (dx,dy,dz) = do (x, y, z) <- get $ viewRot state viewRot state $= (x + dx, y + dy, z + dz) postRedisplay Nothing come to mind. But then this has more to do with Monads than with classes. IO, in particular, and GL and GLUT, which are state machines and thus predestined for OOP. -- (c) this sig last receiving data processing entity. Inspect headers for past copyright information. All rights reserved. Unauthorised copying, hiring, renting, public performance and/or broadcasting of this signature prohibited.