John Hunter wrote:
> On Sun, Apr 27, 2008 at 12:56 PM, Eric Firing <[EMAIL PROTECTED]> wrote:
>
>> The plot thickens. The postscript backend is completely confused by the
>> quiver plot. Try the attached example.
>
>
> Argg, that was a subtle one -- there was a bug in backend ps which was
> exposed only if you are using a path collection with offsets,
> transoffset and clippath and cliprect both None. In that scenario,
> the translate in the bind def function was not getting wrapped in a
> gsave/grestore pair, which was causing the axes to be drawn in the
> wrong place because the translate from the offset remained in effect.
> I tried following the draw_markers logic and putting the
> gsave/grestore in the ps_cmd, eg in draw_markers Michael writes ijn a
> comment:
>
> ps_cmd = ['/o {', 'gsave', 'newpath', 'translate'] # dont want
> the translate to be global
>
> so clearly he was bumping up against the same problem with markers.
> For some reason, trying the same thing in the path_collection was not
> working for me, so I resorted to the somewhat hackish approach of
> forcing _draw_ps to wrap a gsave/grestore if it wasn't getting one
> from the cliprect or clippath:
>
> needwrap = not (clippath or cliprect)
> if needwrap:
> # we need to make sure that there is at least 1
> # save/grestore around each ps write so we'll force it if
> # we're not getting one from the cliprecot or clippath.
> # hackish, yes
> write('gsave\n')
>
> and then
>
> if needwrap:
> write('grestore\n')
>
> I think there will be cleaner way, but it will need some fresh
> eyeballs tomorrow and this will provide a temporary fix.
I went ahead and committed an alternative fix that I think is cleaner,
and greatly reduces the number of needless gsave/grestore pairs. Your
version of the method is still there, with a mangled name, for easy
reference and testing until we are sure which way to go.
Sorry for whatever duplicated effort there has been. I did not intend
to spend a fair chunk of the day working on this, but I let myself get
sucked in. It was a challenge.
As mentioned in a message a few minutes ago that I don't think went to
the list, my gs interpreter is choking on the apostrophe (single quote)
character, as in title or label strings. I can't find any reason why
this should cause trouble--maybe it is a particular version or
configuration of gs.
Eric
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