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If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/README.md b/README.md new file mode 100644 --- /dev/null +++ b/README.md @@ -0,0 +1,30 @@ +## potrace-diagrams + +Convert bitmap images to [diagrams] using [potrace]. Containers helpers +for converting [JuicyPixel] images to bitmaps. + +### Installing + +To install [bindings-potrace] you'll need to install the +[potrace-library]. This should be in your systems package manager. + +### mac installation + +With [homebrew]: + +``` +brew install potrace +``` + +`cabal` may complain about not finding the potrace library. In which can +you can add the `--extra-lib-dirs=/usr/local/lib +--extra-include-dirs=/usr/local/include` flags when `cabal install`ing. + +[diagrams]: https://github.com/diagrams +[potrace]: https://github.com/cchalmers/potrace +[potrace-library]: http://potrace.sourceforge.net +[Hackage]: https://hackage.haskell.org +[JuicyPixel]: https://github.com/Twinside/Juicy.Pixels +[bindings-potrace]: https://github.com/rwbarton/bindings-potrace +[homebrew]: http://brew.sh + diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/diagrams/alphaMax.svg b/diagrams/alphaMax.svg new file mode 100644 --- /dev/null +++ b/diagrams/alphaMax.svg @@ -0,0 +1,186 @@ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + diff --git a/potrace-diagrams.cabal b/potrace-diagrams.cabal new file mode 100644 --- /dev/null +++ b/potrace-diagrams.cabal @@ -0,0 +1,34 @@ +name: potrace-diagrams +version: 0.1.0.0 +synopsis: Potrace bindings for the diagrams library +description: + bindings for the + library. Converts images + using the JuicyPixels library to create diagrams paths. +license: GPL-2 +license-file: LICENSE +author: Christopher Chalmers +maintainer: c.chalmers@me.com +homepage: http://projects.haskell.org/diagrams/ +bug-reports: http://github.com/cchalmers/potrace/issues +copyright: (c) 2015. Christopher Chalmers +category: Graphics +build-type: Simple +extra-source-files: README.md, diagrams/*.svg +extra-doc-files: diagrams/*.svg +cabal-version: >=1.10 + +source-repository head + type: git + location: git://github.com/diagrams/potrace-diagrams.git + +library + exposed-modules: + Diagrams.Potrace + build-depends: + base >= 4.7 && < 5, + diagrams-lib >= 1.3 && < 1.4, + potrace >= 0.1 && < 0.2, + JuicyPixels + hs-source-dirs: src + default-language: Haskell2010 diff --git a/src/Diagrams/Potrace.hs b/src/Diagrams/Potrace.hs new file mode 100644 --- /dev/null +++ b/src/Diagrams/Potrace.hs @@ -0,0 +1,81 @@ +{-# LANGUAGE FlexibleContexts #-} + +----------------------------------------------------------------------------- +-- | +-- Module : Diagarms.Potrace +-- Copyright : (c) 2015 Christopher Chalmers +-- License : BSD-style (see LICENSE) +-- Maintainer : c.chalmers@me.com +-- +-- Trace bitmap images into paths using the potrace library. This module +-- also provides helpers for turning "JuicyPixel" images to bitmap. +-- +module Diagrams.Potrace + ( + -- * Tracing + tracePath + , tracePath' + + -- * Bitmaps + , Bitmap + , generate + , fromImage + , lumaThreshold + + -- * Parameters + , Parameters (..) + , TurnPolicy (..) + + -- ** Lenses + , turdSize + , turnPolicy + , alphaMax + , optTolerance + + -- * Misc + , loop + , pt + ) + where + +import Diagrams.Prelude as D +import Graphics.Potrace as P + +-- | Trace the bitmap image to a path using potrace with 'def' +-- parameters. +tracePath :: Bitmap -> Path V2 Double +tracePath = tracePath' def + +-- | Trace the bitmap image to a path curves using potrace with given +-- parameters. +tracePath' :: Parameters -> Bitmap -> Path V2 Double +tracePath' p bm = Path $ map (mapLoc Trail . loop) (trace' p bm) + +-- Internals ----------------------------------------------------------- + +pt :: P.P2 -> D.P2 Double +pt (P2 x y) = mkP2 x y +-- pt (P2 x y) = mkP2 (realToFrac x) (realToFrac y) + +loop :: Curve -> Located (Trail' Loop V2 Double) +loop (P.Curve p0 segs) = closeLine (lineFromSegments (go p0' segs)) `at` p0' + where + p0' = pt p0 + -- for some reason the starting point is actaully the very last point. + go p (s:ss) = case s of + P.Corner v b -> straight (pt v .-. p) : straight (pt b .-. pt v) : go (pt b) ss + P.Bezier u v b -> bezier3 (pt u .-. p) (pt v .-. p) (pt b .-. p) : go (pt b) ss + go _ [] = [] + +-- path :: [[P.Segment]] -> Path V2 Double +-- path = Path . map (mapLoc Trail . loop) + +-- dia :: Renderable (Path V2 Double) b => P.Bitmap -> QDiagram b V2 Double Any +-- dia = stroke . path . P.pic + +-- loop :: Curve (Trail' Loop V2 Double) +-- loop = foldCurve mkP2 corner cubic (, mempty) <&> \(p, ss) -> +-- where +-- corner u v (p,r) = (p, straight (pt v .-. p) <| straight (pt b .-. pt v) <| r) +-- cubic u v b (p,r) = (p, bezier3 (pt u .-. p) (pt v .-. p) (pt b .-. p) <| go (pt b) ss) +