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add located lens for access into Located things #134

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Nov 2, 2013
Merged

add located lens for access into Located things #134

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8 changes: 7 additions & 1 deletion src/Diagrams/Located.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,11 +19,13 @@

module Diagrams.Located
( Located
, at, viewLoc, unLoc, loc, mapLoc
, at, viewLoc, unLoc, loc, mapLoc, located
)
where

import Control.Lens (Lens)
import Data.AffineSpace
import Data.Functor ((<$>))
import Data.VectorSpace

import Diagrams.Core
Expand Down Expand Up @@ -83,6 +85,10 @@ viewLoc (Loc p a) = (p,a)
mapLoc :: (V a ~ V b) => (a -> b) -> Located a -> Located b
mapLoc f (Loc p a) = Loc p (f a)

-- | A lens giving access to the object within a 'Located' wrapper.
located :: (V a ~ V a') => Lens (Located a) (Located a') a a'
located f (Loc p a) = Loc p <$> f a

deriving instance (Eq (V a), Eq a ) => Eq (Located a)
deriving instance (Ord (V a), Ord a ) => Ord (Located a)
deriving instance (Show (V a), Show a) => Show (Located a)
Expand Down