Hylograph.Brush.Types

data BrushSelection

Brush selection - the rectangular region selected by the user

For 2D brush: x0, y0 (top-left) to x1, y1 (bottom-right) For 1D brush: only x0/x1 or y0/y1 are meaningful

Constructors

• Selection2D { x0 :: Number, x1 :: Number, y0 :: Number, y1 :: Number }
• SelectionX { x0 :: Number, x1 :: Number }
• SelectionY { y0 :: Number, y1 :: Number }
• NoSelection

Instances

• Eq BrushSelection
• Show BrushSelection

type BrushExtent = { x0 :: Number, x1 :: Number, y0 :: Number, y1 :: Number }

Extent for brush (defines the brushable area)

type BrushConfig = { extent :: BrushExtent, onBrush :: Maybe (BrushEvent -> Effect Unit), onEnd :: Maybe (BrushEvent -> Effect Unit), onStart :: Maybe (BrushEvent -> Effect Unit) }

Configuration for creating a brush

• extent: The brushable area bounds
• onStart: Called when brush gesture starts
• onBrush: Called during brush gesture (as selection changes)
• onEnd: Called when brush gesture ends

type BrushEvent = { selection :: BrushSelection }

Brush event passed to handlers

defaultBrushConfig :: BrushConfig

Default brush configuration

Extent covers 0,0 to 100,100 with no handlers. Override as needed.

isInSelection :: Number -> Number -> BrushSelection -> Boolean

Check if a point is within a 2D brush selection

Returns true if the point (x, y) is inside the selection bounds. Returns false for 1D selections or NoSelection.

selectionWidth :: BrushSelection -> Number

Get the width of a brush selection

selectionHeight :: BrushSelection -> Number

Get the height of a brush selection