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README
sdl2-cairo 
Haskell library providing functions to use Cairo to draw on SDL textures.
NOTE: The Processing-style drawing API has been moved to a separate package cairo-canvas.
Install
This library depends on the new SDL2 bindings, available on Hackage as sdl2 version 2.1.0 or greater and cairo bindings.
Just clone and install this repository:
git clone [email protected]:apirogov/sdl2-cairo.git
cd sdl2-cairo
stack install
It should work with recent GHC versions (>= 7.8.4) without problems under Linux und OS X.
Documentation
You can use Cairo with the Render monad on an SDL texture like this:
import SDL.Cairo
import Graphics.Rendering.Cairo
...
texture <- createCairoTexture renderer (V2 800 600)
withCairoTexture texture $ do
setSourceRGBA 1 0 0
lineTo 800 600
stroke
copy renderer texture Nothing Nothing
present renderer
If you are familiar with Processing, you can also use this together with the cairo-canvas package.
import SDL.Cairo
import Graphics.Rendering.Cairo.Canvas
...
texture <- createCairoTexture renderer (V2 800 600)
withCairoTexture' texture $ runCanvas $ do
background $ gray 100
stroke $ red 255
fill $ blue 255 !@ 128
rect $ D 0 0 100 100
rect $ toD (V2 50 50) (V2 150 150)
copy renderer texture Nothing Nothing
present renderer
Finally, you can of course use this as glue to use diagrams with SDL with the Cairo backend:
import SDL.Cairo
import Diagrams.Backend.Cairo
...
let (_,render) = renderDia Cairo (CairoOptions "" (mkSizeSpec $ V2 (Just 800) (Just 600))
RenderOnly False)
(myDiagram :: QDiagram Cairo V2 Double Any)
withCairoTexture texture render
...