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add stroke preview when drawing
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sheaf
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@ -160,7 +160,8 @@ data DocumentContent
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deriving stock ( Show, Generic )
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deriving anyclass NFData
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type StrokeSpline ty brushParams = Spline ty ( CachedStroke RealWorld ) ( PointData brushParams )
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type StrokeSpline clo brushParams =
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Spline clo ( CachedStroke RealWorld ) ( PointData brushParams )
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data Stroke where
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Stroke
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@ -4,18 +4,22 @@
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{-# LANGUAGE GADTs #-}
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{-# LANGUAGE NamedFieldPuns #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE RankNTypes #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE TypeApplications #-}
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module MetaBrush.Document.Draw
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( DrawAnchor(..), anchorsAreComplementary
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, getOrCreateDrawAnchor, addToAnchor
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, withAnchorBrushData
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)
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where
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-- base
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import Data.Functor
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( ($>) )
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import Data.Maybe
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( listToMaybe )
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-- acts
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import Data.Act
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@ -25,6 +29,10 @@ import Data.Act
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import Data.Sequence
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( Seq(..) )
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-- deepseq
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import Control.DeepSeq
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( NFData )
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-- generic-lens
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import Data.Generics.Product.Fields
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( field, field' )
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@ -70,11 +78,17 @@ import MetaBrush.Assert
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import MetaBrush.Brush
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( BrushReference(NoBrush) )
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import MetaBrush.Document
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( Document(..), Stroke(..), StrokeSpline
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( Document(..), DocumentContent(..), Stroke(..), StrokeSpline
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, FocusState(..), PointData(..)
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, _selection, _strokeSpline
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, coords, overStrokeSpline
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)
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import MetaBrush.Document.Serialise
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( Serialisable )
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import MetaBrush.MetaParameter.AST
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( STypesI(..) )
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import MetaBrush.MetaParameter.Interpolation
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( Interpolatable )
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import MetaBrush.Unique
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( Unique, UniqueSupply, freshUnique, uniqueText )
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@ -213,3 +227,30 @@ addToAnchor anchor newSpline = over ( field' @"documentContent" . field' @"strok
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overStrokeSpline updateSpline stroke
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| otherwise
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= stroke
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withAnchorBrushData
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:: forall r
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. DrawAnchor
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-> Document
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-> ( forall pointParams pointFields
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. ( pointParams ~ Super.Rec pointFields, STypesI pointFields
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, Show pointParams, NFData pointParams
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, Interpolatable pointParams
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, Serialisable pointParams
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)
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=> BrushReference pointFields
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-> pointParams
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-> r
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)
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-> r
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withAnchorBrushData anchor ( Document { documentContent = Content { strokes } } ) f =
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splineAnchor . listToMaybe $ filter ( \ Stroke { strokeUnique } -> strokeUnique == anchorStrokeUnique anchor ) strokes
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where
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splineAnchor :: Maybe Stroke -> r
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splineAnchor ( Just ( Stroke { strokeSpline = strokeSpline :: StrokeSpline clo pointData, strokeBrushRef } ) )
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| SOpen <- ssplineType @clo
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= case anchor of
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AnchorAtStart {} -> f strokeBrushRef ( brushParams ( splineStart strokeSpline ) )
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AnchorAtEnd {} -> f strokeBrushRef ( brushParams ( splineEnd strokeSpline ) )
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splineAnchor _
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= f NoBrush SuperRecord.rnil
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@ -81,7 +81,7 @@ import Control.Lens
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import qualified SuperRecord as Super
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( Rec )
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import qualified SuperRecord
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( Intersect, rnil )
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( Intersect )
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-- transformers
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import Control.Monad.Trans.Class
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@ -127,6 +127,8 @@ import MetaBrush.Document
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, _selection
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, coords
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)
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import MetaBrush.Document.Draw
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( withAnchorBrushData )
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import MetaBrush.Document.Selection
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( dragUpdate )
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import MetaBrush.Document.Serialise
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@ -181,7 +183,7 @@ getDocumentRender
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= do
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let
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-- Get any modifications from in-flight user actions (e.g. in the middle of dragging something).
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-- Get any modifications from in-flight user actions (e.g. in the middle of dragging something).
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modifiedStrokes :: [ Stroke ]
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modifiedStrokes = case mode of
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PathMode
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@ -194,9 +196,9 @@ getDocumentRender
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afterDrag :: Maybe DocChange
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afterDrag = dragUpdate p0 p1 dragAction alternateMode doc
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-> case afterDrag of
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Just docUpdate -> ( strokes . documentContent $ newDocument docUpdate )
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_ -> ( strokes content )
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| Just ( PartialPath p0 cp0 _ _ ) <- mbPartialPath
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Just docUpdate -> strokes . documentContent $ newDocument docUpdate
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_ -> strokes content
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| Just ( PartialPath p0 cp0 anchor _ ) <- mbPartialPath
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, let
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mbFinalPoint :: Maybe ( Point2D Double )
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mbControlPoint :: Maybe ( Point2D Double )
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@ -206,31 +208,33 @@ getDocumentRender
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| otherwise
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= ( mbMousePos, Nothing )
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, Just finalPoint <- mbFinalPoint
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-> let
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previewSpline :: Spline Open ( CachedStroke RealWorld ) ( PointData ( Super.Rec '[] ) )
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previewSpline = catMaybesSpline ( invalidateCache undefined )
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( PointData p0 Normal SuperRecord.rnil )
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( do
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cp <- cp0
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guard ( cp /= p0 )
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pure ( PointData cp Normal SuperRecord.rnil )
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)
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( do
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cp <- mbControlPoint
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guard ( cp /= finalPoint )
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pure ( PointData cp Normal SuperRecord.rnil )
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)
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( PointData finalPoint Normal SuperRecord.rnil )
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in
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( ( Stroke
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, let
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previewStroke :: Stroke
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previewStroke = withAnchorBrushData anchor doc \ brushRef ( pointData :: Super.Rec pointFields ) ->
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let
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previewSpline :: Spline Open ( CachedStroke RealWorld ) ( PointData ( Super.Rec pointFields ) )
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previewSpline = catMaybesSpline ( invalidateCache undefined )
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( PointData p0 Normal pointData )
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( do
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cp <- cp0
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guard ( cp /= p0 )
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pure ( PointData cp Normal pointData )
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)
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( do
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cp <- mbControlPoint
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guard ( cp /= finalPoint )
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pure ( PointData cp Normal pointData )
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)
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( PointData finalPoint Normal pointData )
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in
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Stroke
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{ strokeSpline = previewSpline
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, strokeVisible = True
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, strokeUnique = unsafeUnique 987654321
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, strokeName = "Preview stroke (temporary)"
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, strokeBrushRef = NoBrush
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, strokeBrushRef = brushRef
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}
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) : strokes content
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)
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-> previewStroke : strokes content
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_ -> strokes content
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strokesRenderData <- sequenceA $ mapMaybe ( strokeRenderData fitParams documentBrushes ) modifiedStrokes
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