diagrams-gi-cairo: Cairo backend for diagrams drawing EDSL
A full-featured backend for rendering diagrams using the cairo rendering engine. This is intended to be a drop-in replacement for diagrams-cairo, built on top of the more up-to-date gi-cairo package.
This ultimately depends on a C library, via Haskell's FFI, and can be difficult to install on some platforms. If you are just looking for a quick way to visualize diagrams, try the diagrams-svg backend; if you want raster output like PNG, try the diagrams-rasterific backend; if you want to embed diagrams in LaTeX documents, try diagrams-pgf.
Diagrams.Backend.Cairo.CmdLine - if you're just getting started with diagrams, begin here.
Diagrams.Backend.Cairo - look at this next. The general API for the cairo backend.
Diagrams.Backend.Cairo.Internal - the implementation guts of the cairo backend. Users should normally not need to import this module.
Diagrams.Backend.Cairo.List - render diagrams to two-dimensional lists of colors (i.e. pixels).
Diagrams.Backend.Cairo.Ptr - render diagrams to buffers in memory.
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Modules
- Diagrams
- Backend
- Diagrams.Backend.Cairo
- Diagrams.Backend.Cairo.CmdLine
- Diagrams.Backend.Cairo.Internal
- Diagrams.Backend.Cairo.List
- Diagrams.Backend.Cairo.Ptr
- Diagrams.Backend.Cairo.Text
- Diagrams.Backend.Cairo
- Backend
Downloads
- diagrams-gi-cairo-1.5.tar.gz [browse] (Cabal source package)
- Package description (as included in the package)
Maintainer's Corner
For package maintainers and hackage trustees
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Readme for diagrams-gi-cairo-1.5
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diagrams-cairo is a rendering backend for diagrams, a powerful, flexible, declarative domain-specific language for creating vector graphics, using the Haskell programming language.
diagrams-cairo is implemented using the cairo rendering engine and is a fully-featured, officially supported backend for diagrams.
Installation
cabal update && cabal install gtk2hs-buildtools diagrams-cairo
Basic usage
A simple example that uses diagrams-cairo to draw a blue circle:
{-# LANGUAGE NoMonomorphismRestriction #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE TypeFamilies #-}
import Diagrams.Prelude
import Diagrams.Backend.Cairo.CmdLine
d :: Diagram B
d = circle 1 # fc blue
main = mainWith (pad 1.1 d)
Save this to file named Circle.hs and compile it:
ghc --make Circle.hs
This will generate an executable which, when run, outputs a blue
circle to some file. Run the executable with the --help option to
find out more about how to call it.
$ ./Circle --help
./Circle
Usage: ./Circle [-w|--width WIDTH] [-h|--height HEIGHT] [-o|--output OUTPUT]
[--loop] [-s|--src ARG] [-i|--interval INTERVAL]
Command-line diagram generation.
Available options:
-?,--help Show this help text
-w,--width WIDTH Desired WIDTH of the output image
-h,--height HEIGHT Desired HEIGHT of the output image
-o,--output OUTPUT OUTPUT file
-l,--loop Run in a self-recompiling loop
-s,--src ARG Source file to watch
-i,--interval INTERVAL When running in a loop, check for changes every INTERVAL seconds.
ommand-line diagram generation.
The output type will be automatically determined from the file extension. Currently PNG, PDF, PS, and SVG are supported.
$ ./Circle -o circle.png -w 400
The command above generates a PNG file with a width of 400px.
Advanced usage
Instead of just creating a standalone executable, the cairo backend can also be called from within a larger program. For more information, see the Diagram.Backend.Cairo module.