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71 lines
1.9 KiB
Haskell
71 lines
1.9 KiB
Haskell
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{-# LANGUAGE NegativeLiterals #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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module MetaBrush.Asset.Brushes
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( ellipse, blob, rect )
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where
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-- containers
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import Data.Sequence
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( Seq(..) )
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import qualified Data.Sequence as Seq
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( fromList )
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-- MetaBrush
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import Math.Bezier.Stroke
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( StrokePoint(..) )
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import Math.Vector2D
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( Point2D(..) )
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--------------------------------------------------------------------------------
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ellipse :: forall d. Double -> Double -> d -> Seq ( StrokePoint d )
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ellipse w h d = Seq.fromList
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[ pp ( Point2D 0 1 )
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, cp ( Point2D a 1 )
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, cp ( Point2D 1 a )
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, pp ( Point2D 1 0 )
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, cp ( Point2D 1 (-a) )
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, cp ( Point2D a (-1) )
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, pp ( Point2D 0 (-1) )
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, cp ( Point2D (-a) (-1) )
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, cp ( Point2D (-1) (-a) )
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, pp ( Point2D (-1) 0 )
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, cp ( Point2D (-1) a )
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, cp ( Point2D (-a) 1 )
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, pp ( Point2D 0 1 )
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]
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where
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a :: Double
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a = 0.551915024494
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pp, cp :: Point2D Double -> StrokePoint d
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pp ( Point2D x y ) = PathPoint ( Point2D ( w * x ) ( h * y ) ) d
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cp ( Point2D x y ) = ControlPoint ( Point2D ( w * x ) ( h * y ) ) d
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blob :: forall d. Double -> Double -> d -> Seq ( StrokePoint d )
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blob w h d = Seq.fromList
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[ pp ( Point2D 1 0 )
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, cp ( Point2D 1 -1 )
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, cp ( Point2D -1 -1 )
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, pp ( Point2D -1 0 )
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, cp ( Point2D -1 1 )
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, cp ( Point2D 1 1 )
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, pp ( Point2D 1 0 )
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]
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where
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pp, cp :: Point2D Double -> StrokePoint d
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pp ( Point2D x y ) = PathPoint ( Point2D ( w * x ) ( h * y ) ) d
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cp ( Point2D x y ) = ControlPoint ( Point2D ( w * x ) ( h * y ) ) d
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rect :: forall d. Double -> Double -> d -> Seq ( StrokePoint d )
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rect w h d = Seq.fromList
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[ pp ( Point2D 1 1 )
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, pp ( Point2D 1 -1 )
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, pp ( Point2D -1 -1 )
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, pp ( Point2D -1 1 )
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, pp ( Point2D 1 1 )
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]
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where
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pp :: Point2D Double -> StrokePoint d
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pp ( Point2D x y ) = PathPoint ( Point2D ( w * x ) ( h * y ) ) d
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