47 lines
1.0 KiB
Haskell
47 lines
1.0 KiB
Haskell
{-# OPTIONS -Wno-incomplete-uni-patterns #-}
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module Tile (
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tileTexCoords,
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makeTileFromPoly,
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baseFloorTileSize,
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) where
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import Data.Tile
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import Geometry
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tileTexCoords :: Tile -> [Point2]
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tileTexCoords t =
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map
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(calcTexCoord (_tileZero t) tangent (- vNormal tangent))
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(_tilePoly t)
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where
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tangent = _tileTangentPos t - _tileZero t
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calcTexCoord ::
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-- | tile (0,0)
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Point2 ->
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-- | tile tangent
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Point2 ->
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-- | tile cotangent
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Point2 ->
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-- | world point
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Point2 ->
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Point2
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calcTexCoord zp tangent cotangent p = V2 (f tangent) (f cotangent)
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where
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f t = closestPointOnLineParam zp (zp + t) p
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-- # OPTIONS -Wno-incomplete-uni-patterns #-}
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makeTileFromPoly :: [Point2] -> Float -> Tile
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makeTileFromPoly poly z =
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Tile
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{ _tilePoly = poly
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, _tileZero = c
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, _tileTangentPos = c + (baseFloorTileSize *.* normalizeV (d -.- c))
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, _tileArrayZ = z
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}
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where
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(c : d : _) = poly
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baseFloorTileSize :: Float
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baseFloorTileSize = 50
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