44 lines
1.2 KiB
Haskell
44 lines
1.2 KiB
Haskell
{-# OPTIONS_HADDOCK ignore-exports #-}
|
|
|
|
module Parser.Meshparser (meshToArr, facesToArr) where
|
|
|
|
import Algebra.VectorTypes
|
|
import Control.Applicative
|
|
import Data.Attoparsec.ByteString.Char8
|
|
import Data.Either
|
|
import qualified Data.ByteString.Char8 as B
|
|
import Diagrams.TwoD.Types
|
|
|
|
|
|
-- |Convert a text String with multiple vertices and faces into
|
|
-- a list of vertices, ordered by the faces specification.
|
|
facesToArr :: B.ByteString -> [[PT]]
|
|
facesToArr str = fmap (fmap (\y -> meshs str !! (fromIntegral y - 1)))
|
|
(faces str)
|
|
where
|
|
meshs = meshToArr
|
|
faces = rights . fmap (parseOnly parseFace) . B.lines
|
|
|
|
|
|
-- |Convert a text String with multiple vertices into
|
|
-- an array of float tuples.
|
|
meshToArr :: B.ByteString -- ^ the string to convert
|
|
-> [PT] -- ^ the resulting vertice table
|
|
meshToArr =
|
|
fmap p2
|
|
. rights
|
|
. fmap (parseOnly parseVertice)
|
|
. B.lines
|
|
|
|
|
|
-- |Creates a Parser that accepts a single vertice, such as 'v 1.0 2.0'.
|
|
parseVertice :: Parser (Double, Double)
|
|
parseVertice =
|
|
(,)
|
|
<$> (char 'v' *> many' space *> double)
|
|
<*> (many' space *> double)
|
|
|
|
|
|
parseFace :: Parser [Integer]
|
|
parseFace = char 'f' *> many1' (many' space *> decimal)
|