Seems like a good idea to me. I'm a little surprised we haven't seen
this case before. Thanks for the patch -- it's committed in SVN r4391.
Cheers,
Mike
Ben North wrote:
> Hi,
>
> I think there is a bug in the PostScript backend, when trying to draw a
> polygon with zero linewidth. If you have a zero linewidth, the
> generated PostScript is along the lines of
>
> 173.31 49.274 m
> 305.066 57.999 l
> 173.533 46.684 l
> closepath
> gsave
> fill
> grestore
>
> whereas if there is a non-zero linewidth, you get
>
> 173.31 49.274 m
> 305.066 57.999 l
> 173.533 46.684 l
> closepath
> gsave
> fill
> grestore
> stroke
>
> The problem is that in the zero-linewidth case, the path is not cleared.
> Therefore, next time there is a 'stroke', that part of the path is
> stroked. In theory, this doesn't matter because its linewidth is zero,
> but the PostScript docs say not completely unambiguously that a
> zero-width line is as thin as the device allows. Ghostview, for
> instance, makes this noticeably non-zero-width and the result looks
> wrong. Besides, it seems cleaner to leave the current path in the same
> state (i.e., empty) in both cases. The below patch, against SVN head,
> seems to fix this.
>
> Ben.
>
> - - - - 8< - - - -
>
> --- SVN--backend_ps.py 2007-11-20 12:08:51.036996600 +0000
> +++ backend_ps.py 2007-11-20 12:09:00.100300100 +0000
> @@ -947,6 +947,9 @@
>
> if self.linewidth > 0:
> write("stroke\n")
> + else:
> + write("newpath\n")
> +
> if cliprect:
> write("grestore\n")
>
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--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA
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