diagrams / diagrams-postscript Goto Github PK

Postscript backend for Diagrams.

Home Page: http://projects.haskell.org/diagrams/

License: Other

Haskell 100.00%

diagrams-postscript's Introduction

diagrams is a full-featured framework and domain-specific language (embedded in Haskell) for creating declarative vector graphics and animations.

This package is just a convenient wrapper around the diagrams-core, diagrams-lib, diagrams-svg, and diagrams-contrib packages, so they can be installed with a single cabal install --lib diagrams command.

The package also comes with flags to enable six different backends. The native SVG backend is enabled by the -fsvg flag and is enabled by default. If you don't want it, you must explicitly disable it with -f-svg.

The native postscript backend is disabled by default but can be enabled by the -fps flag.

The cairo backend is disabled by default but can be selected with the -fcairo flag. In addition, the GTK backend is based on the cairo backend (but split into a separate package to make installing the cairo backend easier). It can be selected with the fgtk flag.

The native rasterific backend which is disabled by default but can be selected with the -frasterific flag.

The native canvas backend which is disabled by default but can be selected with the -fcanvas flag.

Installation

cabal update && cabal install --lib diagrams

or, to get the postscript backend in addition to the SVG backend:

cabal update && cabal install --lib -fps diagrams

or, to get the cairo backend in addition to the SVG backend:

cabal update && cabal install gtk2hs-buildtools && cabal install --lib -fcairo diagrams

Reporting bugs

Issue trackers for all diagrams-related repositories are hosted under the diagrams organization on github. If you know the specific package containing the bug, report it in the issue tracker specific to that package (for example, diagrams-lib). Otherwise, just report the issue in the issue tracker for the general diagrams repository.

src/Diagrams/Backend/Postscript.hs:144:21: error:
    • No instance for (Eq (SizeSpec V2 Double))
        arising from the second field of ‘PostscriptOptions’
          (type ‘SizeSpec V2 Double’)
      Possible fix:
        use a standalone 'deriving instance' declaration,
          so you can specify the instance context yourself
    • When deriving the instance for (Eq
                                        (Options Postscript V2 Double))
    |
144 |     deriving (Show, Eq)
    |                     ^^

Lines should not be filled

See diagrams/diagrams-cairo#32, diagrams/diagrams-lib@d8d6006, and diagrams/diagrams-cairo@bfa5f89 .

Styles not applying correctly

I have noticed that styles are not applying correctly in Postscript. I imagine that this is due to the change to the rtree stuff, but I don't really know. An example of something going wrong:

arrowBetween a b # lc red

Gives a red arrow head and black line.

1.5 release

As timbod7/haskell-chart#185 tries to make haskell-chart ghc-8.4 compatible, it depends on a 1.5 (SMP supporting) diagrams-postscript release.

Opacity does not work

In this example all circles have the same opacity

import Diagrams.Prelude
import Diagrams.Backend.Postscript
import Diagrams.Backend.Postscript.CmdLine
import Data.Colour (withOpacity)

colors  = map (blue `withOpacity`) [0.1, 0.2 .. 1.0]
example = hcat' with { catMethod = Distrib, sep = 1 }
                (zipWith fcA colors (repeat (circle 1)))

main :: IO ()
main = defaultMain example

Support GHC 9.2

Currently, the lens constraint (<5.1) at first blocks the Cabal build with GHC 9.2.

No way to render to a ByteString in memory directly.

Right now I have to have a place on the file system to scribble a file. This precludes using diagrams-postscript in places like the School of Haskell, where I would like to just serve up a ByteString of generated content to show sexy diagrams to the user.

Implement `MultiBackend`.

Implement MultiBackend for pages of diagrams.

Arrow drawn with arrowAt does not show up

import Diagrams.Prelude
import Diagrams.Backend.Postscript.CmdLine
main = defaultMain $ arrowAt origin unitX <> square 2

produces an empty square.

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