Square.hs

module Graphics.Square(
    renderSquare
  ) where

import Consts
import Data.Word
import Foreign.C.Types
import Game.Camera 
import Game.GoreAndAsh
import Game.GoreAndAsh.SDL 
import Linear
import Linear.Affine
import SDL 

-- | Function of rendering player
renderSquare :: MonadSDL m => Double -> V2 Double -> V3 Double -> Camera -> GameMonadT m ()
renderSquare size pos col c = do  
  mwr <- sdlGetWindowM mainWindowName
  case mwr of 
    Nothing -> return ()
    Just (w, r) -> do 
      wsize <- fmap (fmap fromIntegral) . get $ windowSize w
      rendererDrawColor r $= transColor col 
      fillRect r $ Just $ transformedSquare wsize
  where
    transColor :: V3 Double -> V4 Word8
    transColor (V3 r g b) = V4 (round $ r * 255) (round $ g * 255) (round $ b * 255) 255

    modelMtx :: V2 Double -> M33 Double 
    modelMtx wsize = viewportTransform2D 0 wsize !*! cameraMatrix c !*! translate2D pos

    transformedSquare :: V2 Double -> Rectangle CInt
    transformedSquare wsize = Rectangle (P topleft) (botright - topleft) 
      where
      topleft = fmap round . applyTransform2D (modelMtx wsize) $ V2 (-size/2) (-size/2)
      botright = fmap round . applyTransform2D (modelMtx wsize) $ V2 (size/2) (size/2)