38 lines
884 B
Haskell
38 lines
884 B
Haskell
module Tile
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( tToRender
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, makeTileFromPoly
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) where
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import Data.Tile
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import Geometry
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tToRender :: Tile -> [(Point3,Point3)]
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tToRender t = polyToTris $ zip ps3 coords3
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where
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ps = _tilePoly t
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coords = map (calcTexCoord (_tileZero t) (_tileX t)) ps
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ps3 = map (addToV2 0) ps
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coords3 = map (addToV2 (_tileZ t)) coords
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addToV2 :: a -> V2 a -> V3 a
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addToV2 z (V2 x y) = V3 x y z
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calcTexCoord
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:: Point2 -- ^ tile (0,0)
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-> Point2 -- ^ tile (1,0)
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-> Point2 -- ^ world point
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-> Point2
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calcTexCoord c p x = V2 (0.02 * dotV (p -.- c) xdir) (0.02 * dotV (p -.- c) ydir)
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where
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xdir = x -.- c
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ydir = vNormal xdir
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makeTileFromPoly :: [Point2] -> Float -> Tile
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makeTileFromPoly poly z = Tile
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{ _tilePoly = poly
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, _tileZero = c
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, _tileX = c +.+ normalizeV ((poly !! 1) -.- c)
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, _tileZ = z
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}
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where
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c = head poly
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