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https://gitlab.com/sheaf/metabrush.git
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subdivide paths by double-clicking on them
* still WIP:
- path mode: does not correctly interpolate brushes
- brush mode: does not propagate subdivision to other brushes
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sheaf
parent
9a2f123895
commit
3660cb8dce
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@ -112,6 +112,7 @@ executable MetaBrush
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, MetaBrush.Document.Guide
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, MetaBrush.Document.Selection
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, MetaBrush.Document.Serialise
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, MetaBrush.Document.SubdivideStroke
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, MetaBrush.Event
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, MetaBrush.Render.Document
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, MetaBrush.Time
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@ -107,6 +107,8 @@ import MetaBrush.Document.Selection
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)
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import MetaBrush.Document.Serialise
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( saveDocument, loadDocument )
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import MetaBrush.Document.SubdivideStroke
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( subdivide )
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import MetaBrush.UI.Coordinates
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( toViewportCoordinates )
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import MetaBrush.UI.InfoBar
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@ -564,14 +566,19 @@ data ActionOrigin
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| RulerOrigin Ruler
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deriving stock Show
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data MouseClick = MouseClick ActionOrigin Word32 ( Point2D Double )
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data MouseClickType
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= SingleClick
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| DoubleClick
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deriving stock Show
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data MouseClick = MouseClick ActionOrigin MouseClickType Word32 ( Point2D Double )
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deriving stock Show
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instance HandleAction MouseClick where
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handleAction
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uiElts@( UIElements { viewport = Viewport {..} } )
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vars@( Variables {..} )
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( MouseClick actionOrigin button mouseClickCoords )
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( MouseClick actionOrigin ty button mouseClickCoords )
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= case button of
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-- Left mouse button.
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@ -587,51 +594,69 @@ instance HandleAction MouseClick where
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STM.writeTVar mousePosTVar ( Just pos )
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case actionOrigin of
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ViewportOrigin -> do
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modifiers <- STM.readTVar modifiersTVar
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tool <- STM.readTVar toolTVar
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mode <- STM.readTVar modeTVar
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case tool of
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-- Selection mode mouse hold:
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--
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-- - If holding shift or alt, mouse hold initiates a rectangular selection.
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-- - If not holding shift or alt:
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-- - if mouse click selected an object, initiate a drag move,
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-- - otherwise, initiate a rectangular selection.
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Selection ->
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case selectionMode modifiers of
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-- Drag move: not holding shift or alt, click has selected something.
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New
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| Just newDoc <- dragMoveSelect mode pos doc
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-> do
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STM.writeTVar mouseHoldTVar ( Just $ DragMoveHold pos )
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pure ( UpdateDocTo $ Just newDoc )
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-- Rectangular selection.
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_ -> do
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STM.writeTVar mouseHoldTVar ( Just $ SelectionHold pos )
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pure Don'tModifyDoc
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ViewportOrigin -> case ty of
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-- Pen tool: start or continue a drawing operation.
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Pen -> do
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mbPartialPath <- STM.readTVar partialPathTVar
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STM.writeTVar mouseHoldTVar ( Just $ DrawHold pos )
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case mbPartialPath of
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-- No path started yet: find anchor for drawing (existing stroke endpoint, or new stroke).
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Nothing -> do
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( newDoc, drawAnchor, anchorPt ) <- getOrCreateDrawAnchor uniqueSupply pos doc
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STM.writeTVar partialPathTVar
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( Just $ PartialPath
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{ partialStartPos = anchorPt
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, partialControlPoint = Nothing
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, partialPathAnchor = drawAnchor
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, firstPoint = True
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}
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)
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pure ( UpdateDocTo $ Just newDoc )
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-- Path already started: indicate that we are continuing a path.
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Just pp -> do
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STM.writeTVar partialPathTVar ( Just $ pp { firstPoint = False } )
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pure Don'tModifyDoc
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SingleClick -> do
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modifiers <- STM.readTVar modifiersTVar
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tool <- STM.readTVar toolTVar
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mode <- STM.readTVar modeTVar
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case tool of
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-- Selection mode mouse hold:
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--
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-- - If holding shift or alt, mouse hold initiates a rectangular selection.
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-- - If not holding shift or alt:
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-- - if mouse click selected an object, initiate a drag move,
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-- - otherwise, initiate a rectangular selection.
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Selection ->
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case selectionMode modifiers of
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-- Drag move: not holding shift or alt, click has selected something.
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New
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| Just newDoc <- dragMoveSelect mode pos doc
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-> do
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STM.writeTVar mouseHoldTVar ( Just $ DragMoveHold pos )
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pure ( UpdateDocTo $ Just newDoc )
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-- Rectangular selection.
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_ -> do
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STM.writeTVar mouseHoldTVar ( Just $ SelectionHold pos )
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pure Don'tModifyDoc
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-- Pen tool: start or continue a drawing operation.
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Pen -> do
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mbPartialPath <- STM.readTVar partialPathTVar
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STM.writeTVar mouseHoldTVar ( Just $ DrawHold pos )
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case mbPartialPath of
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-- No path started yet: find anchor for drawing (existing stroke endpoint, or new stroke).
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Nothing -> do
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( newDoc, drawAnchor, anchorPt ) <- getOrCreateDrawAnchor uniqueSupply pos doc
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STM.writeTVar partialPathTVar
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( Just $ PartialPath
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{ partialStartPos = anchorPt
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, partialControlPoint = Nothing
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, partialPathAnchor = drawAnchor
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, firstPoint = True
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}
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)
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pure ( UpdateDocTo $ Just newDoc )
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-- Path already started: indicate that we are continuing a path.
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Just pp -> do
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STM.writeTVar partialPathTVar ( Just $ pp { firstPoint = False } )
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pure Don'tModifyDoc
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DoubleClick -> do
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tool <- STM.readTVar toolTVar
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mode <- STM.readTVar modeTVar
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case tool of
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Selection -> do
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STM.writeTVar mouseHoldTVar Nothing
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let
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mbSubdivide :: Maybe Document
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mbSubdivide = subdivide mode pos doc
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case mbSubdivide of
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Nothing -> pure Don'tModifyDoc
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Just newDoc -> pure ( UpdateDocTo $ Just newDoc )
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-- Ignore double click event otherwise.
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_ -> pure Don'tModifyDoc
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RulerOrigin ruler -> do
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let
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@ -717,11 +742,10 @@ instance HandleAction MouseRelease where
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&& x <= viewportWidth
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&& y <= viewportHeight
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pure ( UpdateDocTo ( Just newDoc ) )
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_ -> do
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_ -> do
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tool <- STM.readTVar toolTVar
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mode <- STM.readTVar modeTVar
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case tool of
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Selection -> do
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156
src/app/MetaBrush/Document/SubdivideStroke.hs
Normal file
156
src/app/MetaBrush/Document/SubdivideStroke.hs
Normal file
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@ -0,0 +1,156 @@
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{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE NamedFieldPuns #-}
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{-# LANGUAGE RecordWildCards #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE TypeApplications #-}
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module MetaBrush.Document.SubdivideStroke
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( subdivide )
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where
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-- base
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import Data.Semigroup
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( Min(..), Arg(..) )
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-- acts
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import Data.Act
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( Act((•)) )
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-- containers
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import Data.Sequence
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( Seq(..) )
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-- generic-lens
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import Data.Generics.Product.Fields
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( field' )
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-- groups
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import Data.Group
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( invert )
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-- transformers
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import Control.Monad.Trans.State.Strict
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( State, runState, put )
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-- MetaBrush
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import qualified Math.Bezier.Cubic as Cubic
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( Bezier(..), closestPoint, subdivide )
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import qualified Math.Bezier.Quadratic as Quadratic
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( Bezier(..), closestPoint, subdivide )
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import Math.Bezier.Stroke
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( StrokePoint(..) )
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import Math.Module
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( quadrance, closestPointToSegment )
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import Math.Vector2D
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( Point2D(..), Vector2D(..) )
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import MetaBrush.Document
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( Document(..), Stroke(..) )
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import MetaBrush.UI.ToolBar
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( Mode(..) )
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--------------------------------------------------------------------------------
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-- | Subdivide a path at the given center, provided a path indeed lies there.
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subdivide :: Mode -> Point2D Double -> Document -> Maybe Document
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subdivide mode c doc@( Document { zoomFactor } )
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| subdivOccurred
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= Just updatedDoc
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| otherwise
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= Nothing
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where
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updatedDoc :: Document
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subdivOccurred :: Bool
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( updatedDoc, subdivOccurred ) = ( `runState` False ) $ field' @"strokes" ( traverse updateStroke ) doc
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updateStroke :: Stroke -> State Bool Stroke
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updateStroke stroke@( Stroke { strokeVisible } )
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| Brush <- mode
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= ( field' @"strokePoints" . traverse )
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( \ spt ->
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( field' @"pointData" . field' @"brushShape" )
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( subdivideStroke strokeVisible ( MkVector2D $ coords spt ) )
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spt
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)
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stroke
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| otherwise
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= ( field' @"strokePoints" )
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( subdivideStroke strokeVisible ( Vector2D 0 0 ) )
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stroke
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subdivideStroke
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:: forall pt
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. Show pt
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=> Bool
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-> Vector2D Double
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-> Seq ( StrokePoint pt )
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-> State Bool ( Seq ( StrokePoint pt ) )
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subdivideStroke False _ pts = pure pts
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subdivideStroke True _ Empty = pure Empty
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subdivideStroke True offset ( spt :<| spts ) = go spt spts
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where
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go :: StrokePoint pt -> Seq ( StrokePoint pt ) -> State Bool ( Seq ( StrokePoint pt ) )
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go sp0 Empty = pure ( sp0 :<| Empty )
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-- Line.
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go sp0 ( sp1 :<| sps )
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| PathPoint {} <- sp1
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, let
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p0, p1, s :: Point2D Double
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p0 = coords sp0
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p1 = coords sp1
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s = closestPointToSegment @( Vector2D Double ) ( invert offset • c ) p0 p1
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sqDist :: Double
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sqDist = quadrance @( Vector2D Double ) c ( offset • s )
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= if sqDist * zoomFactor ^ ( 2 :: Int ) < 16
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then do
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put True
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-- TODO: interpolate brush instead of using these arbitrary intermediate points
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pure ( sp0 :<| sp0 { coords = s } :<| sp1 :<| sps )
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else ( sp0 :<| ) <$> go sp1 sps
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-- Quadratic Bézier curve.
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go sp0 ( sp1 :<| sp2 :<| sps )
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| ControlPoint {} <- sp1
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, PathPoint {} <- sp2
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, let
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p0, p1, p2, s :: Point2D Double
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p0 = coords sp0
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p1 = coords sp1
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p2 = coords sp2
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bez :: Quadratic.Bezier ( Point2D Double )
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bez = Quadratic.Bezier {..}
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sqDist :: Double
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Min ( Arg sqDist ( t, s ) )
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= Quadratic.closestPoint @( Vector2D Double ) bez ( invert offset • c )
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= if t > 0 && t < 1 && sqDist * zoomFactor ^ ( 2 :: Int ) < 16
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then case Quadratic.subdivide @( Vector2D Double ) bez t of
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( Quadratic.Bezier _ q1 _, Quadratic.Bezier _ r1 _ ) -> do
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put True
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-- TODO: interpolate brush instead of using these arbitrary intermediate points
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pure ( sp0 :<| sp1 { coords = q1 } :<| sp2 { coords = s } :<| sp1 { coords = r1 } :<| sp2 :<| sps )
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else ( ( sp0 :<| ) . ( sp1 :<| ) ) <$> go sp2 sps
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-- Cubic Bézier curve.
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go sp0 ( sp1 :<| sp2 :<| sp3 :<| sps )
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| ControlPoint {} <- sp1
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, ControlPoint {} <- sp2
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, PathPoint {} <- sp3
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, let
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p0, p1, p2, p3, s :: Point2D Double
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p0 = coords sp0
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p1 = coords sp1
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p2 = coords sp2
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p3 = coords sp3
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bez :: Cubic.Bezier ( Point2D Double )
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bez = Cubic.Bezier {..}
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Min ( Arg sqDist ( t, s ) )
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= Cubic.closestPoint @( Vector2D Double ) bez ( invert offset • c )
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= if t > 0 && t < 1 && sqDist * zoomFactor ^ ( 2 :: Int ) < 16
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then case Cubic.subdivide @( Vector2D Double ) bez t of
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( Cubic.Bezier _ q1 q2 _, Cubic.Bezier _ r1 r2 _ ) -> do
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put True
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-- TODO: interpolate brush instead of using these arbitrary intermediate points
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pure
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( sp0 :<| sp1 { coords = q1 } :<| sp1 { coords = q2 } :<| sp3 { coords = s }
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:<| sp2 { coords = r1 } :<| sp2 { coords = r2 } :<| sp3 :<| sps
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)
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else ( ( sp0 :<| ) . ( sp1 :<| ) . ( sp2 :<| ) ) <$> go sp3 sps
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go sp0 sps = error ( "subdivideStroke: unrecognised stroke type\n" <> show ( sp0 :<| sps ) )
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@ -1,3 +1,4 @@
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{-# LANGUAGE BlockArguments #-}
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{-# LANGUAGE DerivingStrategies #-}
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{-# LANGUAGE RecordWildCards #-}
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{-# LANGUAGE TypeApplications #-}
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@ -9,6 +10,8 @@ module MetaBrush.Event
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-- base
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import Control.Monad
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( void )
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import Data.Foldable
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( for_ )
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-- gi-gdk
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import qualified GI.Gdk as GDK
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@ -22,7 +25,7 @@ import Math.Vector2D
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import MetaBrush.Action
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( HandleAction(..)
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, ActionOrigin(..)
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, MouseMove(..), MouseClick(..), MouseRelease(..)
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, MouseMove(..), MouseClick(..), MouseClickType(..), MouseRelease(..)
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, Scroll(..), KeyboardPress(..), KeyboardRelease(..)
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, quitEverything
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)
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@ -80,11 +83,19 @@ handleScrollEvent elts vars eventOrigin scrollEvent = do
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handleMouseButtonEvent :: UIElements -> Variables -> ActionOrigin -> GDK.EventButton -> IO Bool
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handleMouseButtonEvent elts vars eventOrigin mouseClickEvent = do
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button <- GDK.getEventButtonButton mouseClickEvent
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x <- GDK.getEventButtonX mouseClickEvent
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y <- GDK.getEventButtonY mouseClickEvent
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mousePos <- adjustMousePosition ( viewport elts ) eventOrigin ( Point2D x y )
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handleAction elts vars ( MouseClick eventOrigin button mousePos )
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ty <- GDK.getEventButtonType mouseClickEvent
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let
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mbClick :: Maybe MouseClickType
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mbClick = case ty of
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GDK.EventTypeButtonPress -> Just SingleClick
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GDK.EventType2buttonPress -> Just DoubleClick
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_ -> Nothing
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for_ mbClick \ click -> do
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button <- GDK.getEventButtonButton mouseClickEvent
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x <- GDK.getEventButtonX mouseClickEvent
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y <- GDK.getEventButtonY mouseClickEvent
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mousePos <- adjustMousePosition ( viewport elts ) eventOrigin ( Point2D x y )
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handleAction elts vars ( MouseClick eventOrigin click button mousePos )
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pure False
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handleMouseButtonRelease :: UIElements -> Variables -> ActionOrigin -> GDK.EventButton -> IO Bool
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