I have made some changes on my github fork, which I like better: paintRaw now has type: paintRaw :: Event w (PaintDC () -> Rect -> [Rect] -> IO ())
So you can use "graphicsContextCreate paintDC". I removed my new handler paintRawContext, since it isn't needed. This should be mostly compatible with old code, since (PaintDC ()) should work with (DC a) I currently have: paintContext :: Event w (DC () -> GraphicsContext () -> Rect -> IO ()) Maybe it would be better to have the following handler? paintGcdc :: Event w (GCDC () -> Rect -> IO ()) I have read that gcdc implements anti-aliasing, but I didn't try it yet... I also duplicated the code of dcBufferWithRefEx to take an extra graphicscontext argument, but I'd like to find a way to tidy that up... Regards, Kristof On 09-03-14 23:21, Kristof Bastiaensen wrote: > I implemented this idea of adding a new paint event handler: > https://github.com/kuribas/wxHaskell/commit/a779f8e7e34fe03822f380c4cdd1aa8a9ed97e81 > > I could be tidied up, because I duplicated a lot of code... > > Regards, > Kristof Bastiaensen > > On 09-03-14 20:10, Kristof Bastiaensen wrote: >> Hi, >> >> I need to use a graphicpath to draw bezier curves, but wxhaskell doesn't >> allow >> me to create a graphicscontext from a paint event. >> >> The reason is the type of the function: >> >> graphicsContextCreate :: WindowDC a -> IO (GraphicsContext ()) >> >> while the paint event callback takes a DC () as argument, which is more >> general. It seem wxwidgets needs to know the type of the DC to create >> a graphicscontext. Also wxwidgets 2.8 doesn't have a function to create >> one from a memoryDC, but 3.0 has. >> >> One solution I came up with would be to replace DC () in the paint-event >> to MemoryDC (), since it's double buffered, and to PaintDC in a paint-raw >> event. This callback would also work with a more general function. >> Unfortunately it fails on Mac-OS since no memoryDc is used in the paint >> callback. >> >> And it still feels like a low level solution, it would be nicer to have >> a higher level >> API that can abstract away these problems. Maybe making a new paint >> callback that already includes the graphiccontext? Also creating a >> graphicspath from a haskell datatype would be nice. >> >> I am willing to help coding this functionality. >> >> Regards, >> Kristof Bastiaensen >> >> ------------------------------------------------------------------------------ >> Subversion Kills Productivity. Get off Subversion & Make the Move to >> Perforce. >> With Perforce, you get hassle-free workflows. Merge that actually works. >> Faster operations. Version large binaries. Built-in WAN optimization and the >> freedom to use Git, Perforce or both. Make the move to Perforce. >> http://pubads.g.doubleclick.net/gampad/clk?id=122218951&iu=/4140/ostg.clktrk >> _______________________________________________ >> wxhaskell-devel mailing list >> wxhaskell-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/wxhaskell-devel > > ------------------------------------------------------------------------------ > Subversion Kills Productivity. Get off Subversion & Make the Move to Perforce. > With Perforce, you get hassle-free workflows. Merge that actually works. > Faster operations. Version large binaries. Built-in WAN optimization and the > freedom to use Git, Perforce or both. Make the move to Perforce. > http://pubads.g.doubleclick.net/gampad/clk?id=122218951&iu=/4140/ostg.clktrk > _______________________________________________ > wxhaskell-devel mailing list > wxhaskell-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wxhaskell-devel ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ wxhaskell-devel mailing list wxhaskell-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wxhaskell-devel
