[pstricks] Hatch angles

[vin gui]

>     Vincent.Guirardel> Actually, I noticed that while I zooming with ghostview, the defect
>     Vincent.Guirardel> seems to decrease (but it remains noticeable). So I looked at 600dpi
>     Vincent.Guirardel> resolution, and then the result looked fine. Is it related to what the 
>     Vincent.Guirardel> doc says about ``funny patterns at low resolution'' p28 while talking 
>     Vincent.Guirardel> about cross-hatches ?
> 
>   I thought that 600 dpi was the default resolution value on "modern" systems
> since many years... For instance, it was already the case in the config.ps
> configuration file for dvips from the teTeX 1.0 branch in 1999 (and perhaps
> before!)

Well you are right. I should say that I viewed the ps file with 
ghostscript -r 600

> 
>   Anyway, I rather think that the problem that you submit is an artefact
> introduced by GhostScript (at least with the X11 device). The effect that you
> speak about is still visible on screens at normal resolutions, and both with
> the versions 7.05 and 8.10 that I tested. The appearance is correct only for
> magnifications of 16, 32 and 64. But you can also verify that converting the
> PostScript file to PDF and viewving this resulting file with Acroread or xpdf
> give the correct behavior, even without magnification.

You are right.
Many thanks !

Vincent.