module Tile
    where
import Data.Tile
import Geometry
import Geometry.Data
import Picture.Data

tToRender :: Tile -> [RenderType]
tToRender t = map Render3x3 $ polyToTris $ zip ps3 coords3
  where
    ps = _tilePoly t
    coords = map (calcTexCoord (_tileCenter t) (_tileX t) (_tileY t)) ps
    ps3 = map (mkTrip 0.9) ps
    coords3 = map (mkTrip (_tileZ t)) coords

mkTrip :: c -> (a,b) -> (a,b,c)
mkTrip z (x,y) = (x,y,z)

calcTexCoord
    :: Point2   -- ^ tile (0,0)
    -> Point2   -- ^ tile (1,0)
    -> Point2   -- ^ tile (0,1)
    -> Point2   -- ^ world point
    -> Point2
calcTexCoord cen x' y' p = 
    ( magV (projV (p -.- cen) x) / magV x
    , magV (projV (p -.- cen) y) / magV y
    )
  where
    x = x' -.- cen
    y = y' -.- cen

oTile
    :: [Point2]
    -> Float
    -> Tile
oTile poly z = Tile
    { _tilePoly = poly
    , _tileCenter = c
    , _tileX = x
    , _tileY = y
    , _tileZ = z
    }
  where
    c = head poly
    xdir = 50 *.* normalizeV (poly !! 1 -.- c)
    x = c +.+ xdir
    y = c +.+ vNormal xdir