Diagrams.Backend.Gtk

Convenient interface to rendering diagrams directly on Gtk widgets using the Cairo backend.

Documentation

defaultRender :: Monoid' m => DrawingArea -> QDiagram Cairo R2 m -> IO ()

Render a diagram to a DrawingArea, rescaling to fit the full area.

toGtkCoords :: Monoid' m => QDiagram Cairo R2 m -> QDiagram Cairo R2 m

Convert a Diagram to the backend coordinates.

Provided to Query the diagram with coordinates from a mouse click event.

 widget `on` buttonPressEvent $ tryEvent $ do
   click <- eventClick
   (x,y) <- eventCoordinates
   let result = runQuery (query $ toGtkCoords myDiagram) (P (x,y))
   do_something_with result

toGtkCoords does no rescaling of the diagram, however it is centered in the window.

renderToGtk

Arguments

:: (DrawableClass dc, Monoid' m)

=> dc

widget to render onto

-> QDiagram Cairo R2 m

Diagram

-> IO ()

Render a diagram to a DrawableClass. No rescaling or transformations will be performed.

Typically the diagram will already have been transformed by toGtkCoords.