Re: [wxhaskell-users] wxhaskell 0.7 arrowhead line styles, graph editing and misc questions

[Daan L. <daa...@xs...>]

Hi Claus,

On Wed, 9 Jun 2004 19:26:25 +0100, Claus Reinke <cla...@ta...> wrote:

> I've just started playing around with wxhaskell a little bit
> more seriously, and keep having problems finding my way
> through the docs.

Yes, the documentation is still problematic -- allthough I have worked
very hard to document everything *somewhere* :-) Many times, I give
all classes a specific widget belongs too in the description of the
creation function.

Regarding arrowheads, see the "WX.Draw" module documentation.
There is no arrowhead primitive, I see, so you need to draw a little
triangle yourself :-(  -- but don't forget to look at the "penCap"
attribute of a DC.

> How do I avoid my wxhaskell window
> to flick to an interim size before settling on the intended size
> (happens, e.g., with the bouncing ball demo)?

Yes, annoying. I know how to solve this now, so it will be in
version 0.8. (-- which is a big update btw, with automatic
memory management of bitmaps etc.)

> I'd like to hack on a little Petri net editor, and while that
> hasn't been too difficult so far, it sounds like a standard
> problem, so: is there a graph editor component for wxhaskell
> that I could build on? The wxwidgets pages mention an
> "Objects Graphic Library (OGL)" but I can't find any further
> info on this.

Never heard of it either? Maybe it is in the contributions. I'll
look into it -- maybe it is a good addition to include.

> Also, there seem to be a few oddities with the demos on
> a windows98 box (in addition to the window size problem):
>
>     - TimeFlows: only "Time" follows the mouse, the other
>         words hang in the upper left corner
>     - Process: responds only with error pings, whatever the
>         input

Hmm, I never tested it myself on windows98 -- I can imagine that
Process doesn't work as it uses multi threading, but the "Time"
behaviour is strange indeed -- probably the "idle" events don't come
through correctly (or getCPUTime is broken?)

> As for installation, I'd prefer to put the library in the ghc dirs
> instead of the system dirs. And, after registering wx and wxcore
> with ghc, I still have to give the -package wx flag when starting
> ghci. Can't ghc/ghci deduce that from the imports [ghc docs,
> 4.8.1. Using a package: Some packages are automatically
> available: you don't need to specify any extra flags to use
> them (except in certain circumstances; see below). All the
> packages which contain hierarchical libraries fall into this
> category.]?

I never looked into "automatic" loading. If I can find out how it
works, I'll try to include it in version 0.8. Maybe you can instruct
ghc yourself to include it by default? (using ghc-pkg)

> Oh, and does wxhaskell work with hugs? If yes, easily installable
> packages to replace the aging HGL/SOEGraphics would be nice:-)

Never tried it, but I think that the library might be a bit heavy
weight for Hugs. However, I never particularly rely on GHC features
so it might just work.

All the best,
  Daan.


>
> Cheers,
> Claus
>
>
>
>
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