This module contains the internal implementation guts of the diagrams cairo backend. If you want to see how the cairo backend works under the hood, you are in the right place (try clicking on the "Source" links). (Guts under the hood, what an awful mixed metaphor.) If you know what you are doing and really want access to the internals of the implementation, you are also in the right place. Otherwise, you should have no need of this module; import Diagrams.Backend.Cairo.CmdLine or Diagrams.Backend.Cairo instead.
The one exception is that this module may have to be imported
sometimes to work around an apparent bug in certain versions of
GHC, which results in a "not in scope" error for
- data Cairo = Cairo
- data OutputType
- type RenderM a = StateT () Render a
- save :: RenderM ()
- restore :: RenderM ()
- renderC :: (Renderable a Cairo, V a ~ R2) => a -> RenderM ()
- cairoMiscStyle :: Style v -> RenderM ()
- fromFontSlant :: FontSlant -> FontSlant
- fromFontWeight :: FontWeight -> FontWeight
- cairoStrokeStyle :: Style v -> Render ()
- setSource :: Color c => c -> Style v -> Render ()
- cairoTransf :: T2 -> Render ()
- fromLineCap :: LineCap -> LineCap
- fromLineJoin :: LineJoin -> LineJoin
- fromFillRule :: FillRule -> FillRule
This data declaration is simply used as a token to distinguish
the cairo backend: (1) when calling functions where the type
inference engine would otherwise have know way to know which
backend you wanted to use, and (2) as an argument to the
Renderable type classes.
Output types supported by cairo, including four different file types (PNG, PS, PDF, SVG). If you want to output directly to GTK windows, see the diagrams-gtk package.
The custom monad in which intermediate drawing options take
Render is cairo's own rendering
monad. At one point
RenderM really did use
StateT, but then
the state got taken out... but the
StateT remains, now with a
zen-like state of type unit, "just in case". Think of it as a
good luck charm.
Handle "miscellaneous" style attributes (clip, font stuff, fill color and fill rule).
Multiply the current transformation matrix by the given 2D transformation.