Re: [PyX-devel] Curves with infinite curvature

[Andre W. <wo...@us...>]

Hi,

On 14.09.05, Joerg Lehmann wrote:
> > This means I have to compare with the _marker from the corresponding
> > module: normpath._marker in this case:
> 
> No, sorry, you misunderstood that. _marker is only used for determining
> whether someone passed a keyword argument or not. That's completely
> unrelated to the discussion on the undefined results. There, of course,
> we have to export the undefined instance. But again, it should not be
> contained in the helper module, but in the corresponding module (i.e.
> normpath) itself.
> 
> Btw, as you said yourself, <module>._marker would be bad anyway.

Right, those markers should be local only. I was trying to use a
single _marker all over the place for some other reason, which I'm now
convinced was a bad idea after the latest discussion on that list.

> But we
> already convinced André, so no need to discuss this again.

*smile*

I bag you pardon for mixing up the different issues. Orgininally I
thought it would be worth to thing about, but it's rejected.

To summarize it again: We should have local _markers and an global
helper._invalid. The later should (for the moment) be used as return
value in result lists of various normpath methods, which are able to
handle a handle/process/evaluate a list of points to mark errors.
There's no need for an trafo.invalid, since a trafo is either valid or
it raises an exception ...


André

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