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https://gitlab.com/sheaf/metabrush.git
synced 2024-11-27 09:24:08 +00:00
fix brush stroke point order for open brush path
* also: add some preset brushes
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sheaf
parent
62bb1451c5
commit
9bde44ed42
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@ -98,7 +98,8 @@ executable MetaBrush
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Main.hs
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other-modules:
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MetaBrush.Asset.Colours
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MetaBrush.Asset.Brushes
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, MetaBrush.Asset.Colours
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, MetaBrush.Asset.Cursor
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, MetaBrush.Asset.InfoBar
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, MetaBrush.Asset.Logo
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66
app/Main.hs
66
app/Main.hs
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@ -58,6 +58,8 @@ 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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import MetaBrush.Asset.Brushes
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( ellipse, rect )
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import MetaBrush.Asset.Colours
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( getColours )
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import MetaBrush.Asset.Logo
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@ -102,7 +104,7 @@ testDocuments = IntMap.fromList
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{ displayName = "Document 1"
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, filePath = Nothing
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, unsavedChanges = False
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, strokes = [ Stroke ( circle ( PointData Normal ( rect $ BrushPointData Normal ) ) ) "Circle" True ( unsafeUnique 0 )
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, strokes = [ Stroke ( ellipse 150 100 ( PointData Normal ( rect 30 6 $ BrushPointData Normal ) ) ) "Ellipse" True ( unsafeUnique 0 )
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]
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, bounds = AABB ( Point2D 0 0 ) ( Point2D 100 100 )
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, viewportCenter = Point2D 50 50
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@ -112,62 +114,20 @@ testDocuments = IntMap.fromList
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{ displayName = "Document 2"
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, filePath = Nothing
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, unsavedChanges = True
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, strokes = [ ]
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, strokes = [ Stroke linePts "Line" True ( unsafeUnique 1 ) ]
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, bounds = AABB ( Point2D 0 0 ) ( Point2D 50 50 )
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, viewportCenter = Point2D 10 10
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, zoomFactor = 0.25
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, viewportCenter = Point2D 0 0
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, zoomFactor = 1
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}
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]
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circle :: forall a. a -> Seq ( StrokePoint a )
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circle 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 a
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pp p = PathPoint ( fmap ( * 100 ) p ) d
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cp p = ControlPoint ( fmap ( * 100 ) p ) d
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razor :: forall a. a -> Seq ( StrokePoint a )
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razor d = Seq.fromList
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[ pp ( Point2D 30 0 )
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, cp ( Point2D 30 -6 )
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, cp ( Point2D -30 -6 )
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, pp ( Point2D -30 0 )
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, cp ( Point2D -30 3 )
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, cp ( Point2D 30 3 )
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, pp ( Point2D 30 0 )
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]
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where
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pp, cp :: Point2D Double -> StrokePoint a
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pp p = PathPoint p d
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cp p = ControlPoint p d
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rect :: forall a. a -> Seq ( StrokePoint a )
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rect d = Seq.fromList
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[ pp ( Point2D 20 5 )
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, pp ( Point2D 20 -5 )
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, pp ( Point2D -20 -5 )
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, pp ( Point2D -20 5 )
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, pp ( Point2D 20 5 )
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]
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where
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pp :: Point2D Double -> StrokePoint a
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pp p = PathPoint p d
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linePts :: Seq ( StrokePoint PointData )
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linePts = Seq.fromList
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[ PathPoint ( Point2D 0 (-100) ) ( PointData Normal ( ellipse 30 8 $ BrushPointData Normal ) )
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, ControlPoint ( Point2D 0 ( -30) ) ( PointData Normal ( ellipse 25 6 $ BrushPointData Normal ) )
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, ControlPoint ( Point2D 0 ( 30) ) ( PointData Normal ( ellipse 15 6 $ BrushPointData Normal ) )
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, PathPoint ( Point2D 0 ( 100) ) ( PointData Normal ( ellipse 5 2 $ BrushPointData Normal ) )
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]
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--------------------------------------------------------------------------------
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70
src/app/MetaBrush/Asset/Brushes.hs
Normal file
70
src/app/MetaBrush/Asset/Brushes.hs
Normal file
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@ -0,0 +1,70 @@
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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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@ -115,18 +115,17 @@ stroke allPts@( spt0 :<| spt1 :<| spts )
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| isClosed
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= Right ( fwdPts, bwdPts )
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| otherwise
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= Left ( fwdPts <> bwdPts )
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= Left ( startingCap <> fwdPts <> bwdPts )
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where
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startOffset, endOffset :: Vector2D Double
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tgt_start, tgt_end :: Vector2D Double
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brush_start, brush_end :: Seq ( StrokePoint x )
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startOffset = Point2D 0 0 --> coords spt0
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tgt_start = coords spt0 --> coords spt1
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( tgt_end, endOffset ) = case allPts of
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_ :|> sptnm1 :|> sptn -> ( coords sptnm1 --> coords sptn, Point2D 0 0 --> coords sptn )
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( tgt_end, endOffset, brush_end ) = case allPts of
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_ :|> sptnm1 :|> sptn -> ( coords sptnm1 --> coords sptn, Point2D 0 0 --> coords sptn, brushShape sptn )
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_ -> error "impossible"
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brush_start :: Seq ( StrokePoint x )
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brush_start = brushShape spt0
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isClosed :: Bool
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@ -149,19 +148,6 @@ stroke allPts@( spt0 :<| spt1 :<| spts )
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-- Connecting paths at a point of discontinuity of the tangent vector direction (G1 discontinuity).
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-- This happens at corners of the brush path (including endpoints of an open brush path, where the tangent flips direction).
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joinAndContinue :: Vector2D Double -> StrokePoint d -> Seq ( StrokePoint d ) -> ( Seq ( StrokePoint () ), Seq ( StrokePoint () ) )
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joinAndContinue _ _ Empty
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-- Closed curve.
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| isClosed
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= if parallel tgt_start tgt_end
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then ( Empty, Empty )
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else ( startOffset • joinWithBrush ( withTangent tgt_start brush_start ) ( withTangent tgt_end brush_start ) brush_start
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, startOffset • joinWithBrush ( withTangent ( (-1) *^ tgt_start ) brush_start ) ( withTangent ( (-1) *^ tgt_end ) brush_start ) brush_start
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)
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-- Open curve.
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| otherwise
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= ( endOffset • joinWithBrush ( withTangent tgt_end brush_start ) ( withTangent ( (-1) *^ tgt_end ) brush_start ) brush_start
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, startOffset • joinWithBrush ( withTangent ( (-1) *^ tgt_start ) brush_start ) ( withTangent tgt_start brush_start ) brush_start
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)
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joinAndContinue tgt sp0 ( sp1 :<| sps )
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| tgt' `parallel` tgt
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= go sp0 ( sp1 :<| sps )
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@ -177,6 +163,24 @@ stroke allPts@( spt0 :<| spt1 :<| spts )
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tgt' = coords sp0 --> coords sp1
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brush0 :: Seq ( StrokePoint () )
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brush0 = removePointData $ brushShape @x sp0
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joinAndContinue _ _ Empty
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-- Closed curve.
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| isClosed
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= if parallel tgt_start tgt_end
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then ( Empty, Empty )
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else ( startOffset • joinWithBrush ( withTangent tgt_start brush_start ) ( withTangent tgt_end brush_start ) brush_start
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, startOffset • joinWithBrush ( withTangent ( (-1) *^ tgt_start ) brush_start ) ( withTangent ( (-1) *^ tgt_end ) brush_start ) brush_start
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)
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-- Open curve.
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| otherwise
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= ( endOffset • joinWithBrush ( withTangent tgt_end brush_end ) ( withTangent ( (-1) *^ tgt_end ) brush_end ) brush_end
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, Empty -- handled separately: see 'startingCap' below
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)
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-- Final cap for an open curve. Handled separately for correct stroke order.
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startingCap :: Seq ( StrokePoint () )
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startingCap
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= startOffset • joinWithBrush ( withTangent ( (-1) *^ tgt_start ) brush_start ) ( withTangent tgt_start brush_start ) brush_start
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go :: StrokePoint d -> Seq ( StrokePoint d ) -> ( Seq ( StrokePoint () ), Seq ( StrokePoint () ) )
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go _ Empty = ( Empty, Empty )
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