[](http://travis-ci.org/diagrams/diagrams-postscript)
_diagrams-postscript_ is a rendering backend for [diagrams], a powerful,
flexible, declarative domain-specific language for creating vector graphics,
using the [Haskell programming language][haskell].
[diagrams]: http://projects.haskell.org/diagrams/
[haskell]: http://www.haskell.org/haskellwiki/Haskell
_diagrams-postscript_ has a simple rendering engine that outputs
[PostScript™ language][postscript] files and is an officially supported backend
for diagrams.
[postscript]: http://www.adobe.com/products/postscript/pdfs/PLRM.pdf
# Installation
```
cabal update && cabal install diagrams-postscript
```
# Basic usage
A simple example that uses _diagrams-postscript_ to draw a blue circle:
```haskell
import Diagrams.Prelude
import Diagrams.Backend.Postscript.CmdLine
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]
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
```
The output type will be automatically determined from the file
extension. Currently EPS and PS are supported.
```
$ ./Circle -o circle.eps -w 400
```
The command above generates an EPS file with a width of 400pt.
# Advanced usage
Instead of just creating a standalone executable, the postscript backend
can also be called from within a larger program. For more
information, see the Diagram.Backend.Postscript module.
--
PostScript™ is a trademark of Adobe.