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ANN: diagrams 0.2
by Brent Yorgey 06 Feb '09

06 Feb '09

I am very pleased to announce the 0.2 release of the diagrams package, an embedded domain-specific language for creating simple graphics in a compositional style. This release includes a number of significant new features, including: * support for arbitrary straight and curved paths * more shape primitives, including polygons and rounded rectangles * support for rendering text * PNG, PDF, PS, and SVG output * built-in color support replaced with external dependence on the feature-rich colour library and many more! More information, examples, and installation instructions can be found at http://code.haskell.org/diagrams. More features are planned for future releases, so contributions and suggestions are welcome. (Please note: since diagrams depends on the Cairo library, which has unfortunately not been Cabalized, you cannot install the diagrams library with cabal-install, unless you already have the cairo package installed. See the above website for instructions.) A special thanks to Dougal Stanton for his contributions to the library and help in preparing this release. -Brent

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HGL window update problem
by Rodrigo Queiro 06 Feb '09

06 Feb '09

In this program, the HGL window only updates when I mouseover it. Can someone tell me why this is / how I should avoid it? Thanks! Rodrigo module Main where import Graphics.HGL import Control.Concurrent import Control.Concurrent.MVar import Control.Monad main = do stringMVar <- newEmptyMVar forkIO . runGraphics $ do w <- openWindowEx "HGLTest" Nothing (300, 100) DoubleBuffered Nothing forever $ do string <- takeMVar stringMVar setGraphic w $ text (0, 0) string forever $ do string <- getLine putMVar stringMVar string

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Happstack 0.1 Released!
by Matthew Elder 06 Feb '09

06 Feb '09

Hello Haskell Cafe, I just wanted to inform you that the Happstack project has shipped it's 0.1 release. For those of you who don't know, Happstack is the successor for the HAppS project. More details on the release can be found at http://blog.happstack.com/2009/02/03/happstack-01-released . Thanks for your time, Matthew Elder -- Need somewhere to put your code? http://patch-tag.com Want to build a webapp? http://happstack.com

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Re: [Haskell-cafe] Happstack 0.1 Released!
by Henning Thielemann 06 Feb '09

06 Feb '09

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Re: [Haskell-cafe] about integer and float operations
by Henning Thielemann 06 Feb '09

06 Feb '09

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Re: OpenAL
by Paul Langevin 06 Feb '09

06 Feb '09

> AL lib: alSource.c:2291: alcDestroyContext(): 1 Source(s) NOT deleted Brian, have you tried currentContext $= Nothing before closing the device ? It works for me now : no message from ALSA (and still the sounds) _________________________________________________________________ Téléphonez gratuitement à tous vos proches avec Windows Live Messenger ! Téléchargez-le maintenant ! http://www.windowslive.fr/messenger/1.asp

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Re: Haddock
by David Waern 06 Feb '09

06 Feb '09

Hi everyone, I received this question from Lennart Augustsson (via Simon M) and thought I'd send out an inquiry to the Haskell community in general (Lennart, I hope you don't mind): Lennart writes: > We have some local patches for haddock that extends the <<blah>> > syntax so you can put TeX formulae in the documentation. > It looks like, <<! LaTeX stuff here !>>, but I'd like to extend it so > you can process the string with any command. > > Are you interested in folding this into the main branch? So the question is about extending the Haddock markup language. When modifying the language we should think about the tension between familiarity, presentation features (pictures, math, whatever) and visual portability across different mediums (HTML, ghci, IDE tooltips, etc). And here I should say that Haddock already supports pictures using the << url >> syntax. IMHO, adding <<! LaTeX !>> for TeX math is fine, because: - math in documentation is often useful - if you're going to write math, you need a format, even when the medium is plain text as in ghci. - TeX formulae seem to be relatively widely used and understood. As for running arbitrary commands, I think we are opening up to a lot of unfamiliar syntax. I'd like to hear what everyone thinks about that. There was also a thread about Haddock markup on haskell-cafe@ about a year ago, which originated with the interesting idea of using Markdown (or a Pandoc-extended version of it) instead of the current language: http://www.mail-archive.com/haskell-cafe@haskell.org/msg38054.html I think the original idea there is pretty nice, but let's first focus on the current markup language in order to answer Lennart's question. That thread contains some useful opinions on this matter, also. So, any comments? :) David

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Mutually recursive modules
by Henning Thielemann 06 Feb '09

06 Feb '09

I have written a small overview, how mutually recursive modules are currently supported and how they can be avoided: http://haskell.org/haskellwiki/Mutually_recursive_modules Please add information about other compilers and more ideas on breaking cycles.

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How to properly design a Haskell TK
by Achim Schneider 06 Feb '09

06 Feb '09

I've been thinking a bit, and come to the conclusion that we should just do it as others did it before: Start off with application-specific tk's, figure out what's cool and what's compatible and then put them into libraries. In short: Stop building cathedrals. -- (c) this sig last receiving data processing entity. Inspect headers for copyright history. All rights reserved. Copying, hiring, renting, performance and/or quoting of this signature prohibited.

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Re : OpenAL
by Paul Langevin 06 Feb '09

06 Feb '09

For those who follow, I finally find the way to mix (simpler than I thought) import Sound.ALUT playSound :: IO () playSound = withProgNameAndArgs runALUT $ \ _ _ -> do ↠ buffer1 <- createBuffer $ Sine 440 0 1 ↠ buffer2 <- createBuffer $ HelloWorld ↠ [source1,source2] <- genObjectNames 2 ↠ buffer source1 $= Just buffer1 ↠ buffer source2 $= Just buffer2 ↠ play [source1,source2] ↠ sleep 2 ↠ return () main = playSound (sorry if unicode if ugly, I don't know what to do with spaces) _________________________________________________________________ Téléphonez gratuitement à tous vos proches avec Windows Live Messenger ! Téléchargez-le maintenant ! http://www.windowslive.fr/messenger/1.asp

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