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
