134 lines
3.5 KiB
Haskell
134 lines
3.5 KiB
Haskell
module Client.Graphics where
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import qualified Control.Concurrent.STM as STM
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import Control.Monad.RWS
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import qualified Data.Matrix as M
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import Data.Maybe
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import qualified Data.Vector as V
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import Graphics.Vty
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import Linear
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-- internal imports
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import Client.Types
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import Library.Types
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vFOV :: Float
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vFOV = pi / 2
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hFOV :: Float
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hFOV = pi / 1.5
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draw :: Game ()
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draw = do
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mapSlice <- gets scMapSlice
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wizard <- gets scWizard
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clientStatVar <- gets scClientState
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vty <- clientVty <$> liftIO (STM.atomically $ STM.readTMVar clientStatVar)
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(w, h) <- liftIO $ displayBounds (outputIface vty)
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let dims@(dw, dh) = (w, h - 4)
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result = V.generate (fromIntegral dh)
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(\mh -> string defAttr $ map
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(\mw -> drawPixel mapSlice wizard dims (fromIntegral mw, fromIntegral mh))
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[1 .. dw]
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)
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image = V.foldl (<->)
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emptyImage
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(result V.++
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V.foldl (V.++) V.empty (V.generate 4 (const $ V.singleton emptyImage)))
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picture = picForImage image
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liftIO $ update vty picture
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drawPixel
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:: MapSlice
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-> Wizard
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-> (Int, Int)
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-> (Float, Float)
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-> Char
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drawPixel slice wizard (w, h) currentPixel =
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let rayLength = castRay
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(wizardRot wizard)
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(wizardPos wizard)
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slice
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(fromIntegral w, fromIntegral h)
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currentPixel
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in getPixel (fromMaybe 5 rayLength)
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castRay
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:: Float
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-> V2 Float
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-> MapSlice
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-> (Float, Float)
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-> (Float, Float)
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-> Maybe Float
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castRay wizardRot wizardPos@(V2 wr wc) slice (w, h) (dw, dh) =
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let slicePos@(V2 sr sc) =
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V2 (wr + 5 - (fromIntegral $ floor wr)) (wc + 5 - (fromIntegral $ floor wc))
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view@(V2 vr vc) = V2 0 1 `rotVec` (wizardRot + (- hFOV / 2 + dw * hFOV / w))
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stepR = signum vr
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stepC = signum vc
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tMaxR = (fromIntegral $ floor $ wr + stepR - wr) / vr
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tMaxC = (fromIntegral $ floor $ wc + stepC - wc) / vc
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tDeltaR = stepR / vc
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tDeltaC = stepC / vc
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sliceRay = (sr, sc) :
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buildRay (tMaxR, tMaxC) (tDeltaR, tDeltaC) (stepR, stepC) (sr, sc) slicePos
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in fmap (/ cos (-vFOV / 2 + dh * vFOV / h)) (getRayCollision slicePos view slice sliceRay)
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buildRay
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:: (Float, Float)
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-> (Float, Float)
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-> (Float, Float)
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-> (Float, Float)
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-> V2 Float
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-> [(Float, Float)]
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buildRay (tMaxR, tMaxC) delta@(tDeltaR, tDeltaC) rstep@(stepR, stepC) (r, c) slicePos =
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if distance slicePos (V2 r c) < 4
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then if tMaxR < tMaxC
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then
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let ntMaxR = tMaxR - tDeltaR
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nr = r - stepR
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in (nr, c) : buildRay (ntMaxR, tMaxC) delta rstep (nr, c) slicePos
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else
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let ntMaxC = tMaxC - tDeltaC
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nc = c - stepC
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in (r, nc) : buildRay (tMaxR, ntMaxC) delta rstep (r, nc) slicePos
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else []
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getRayCollision
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:: V2 Float
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-> V2 Float
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-> MapSlice
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-> [(Float, Float)]
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-> Maybe Float
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getRayCollision _ _ _ [] = Nothing
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getRayCollision _ _ _ [_] = Nothing
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getRayCollision pos@(V2 pr pc) view@(V2 vr vc) mapSlice ((wizR, _):tile@(tr, tc):ts) =
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case msViewMap mapSlice M.! (floor tr, floor tc) of
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Just Wall ->
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let t = if floor wizR == floor tr
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then (fromIntegral (floor tc) + pc) / vc
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else (fromIntegral (floor tr) + pr) / vr
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vec = (* t) <$> view
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in Just (sqrt $ vec `dot` vec)
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_ -> getRayCollision pos view mapSlice (tile:ts)
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getPixel :: Float -> Char
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getPixel l
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| l <= 1 = '█'
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| l <= 2 = '▓'
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| l <= 3 = '▒'
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| l <= 4 = '░'
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| otherwise = ' '
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rotVec :: V2 Float -> Float -> V2 Float
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rotVec (V2 x y) rad = V2 nx ny
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where
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nx = x * cos rad + y * sin rad
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ny = x * sin rad - y * cos rad
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