I believe I fixed this in this pull request.
https://github.com/matplotlib/matplotlib/pull/566
Unfortunately, I don't think there is a easy workaround other than not
using the "fancy" arrow style.
Regards,
-JJ
On Sun, Oct 30, 2011 at 1:51 PM, Brendan Barnwell <brenb...@brenbarn.net> wrote:
> I encountered a strange error when trying to put some annotations on
> a graph. I was able to simplify it to this:
>
> pyplot.plot([1, 2, 3, 4], [0, -1, -2, 8])
> pyplot.annotate("Blah", xy=(2, 2), xytext=(-20,-20),
> textcoords='offset points',
> bbox=dict(boxstyle='round,pad=0.5'),
> arrowprops=dict(arrowstyle='fancy',
> connectionstyle='arc3,rad=0'))
>
> On my system (matplotlib 1.1.0 with Python 2.6 on Windows XP), this
> causes a long traceback culminating in
>
> File "C:\Program Files\Python\lib\site-packages\matplotlib\bezier.py",
> line 129, in find_bezier_t_intersecting_with_closedpath
> raise ValueError("the segment does not seemed to intersect with
> the path")
>
> Increasing the xytext coordinates (in absolute value), to for
> instance (-50, -50) works with no error, and it also works without the
> special bbox style. Just guessing from the error message, it looks
> like certain combinations of fancy patches are causing problems
> because the shapes don't intersect in the way the drawing code assumes
> they should.
>
> I don't see anything in the docs about such edge cases, so this looks
> like a bug. Judging from the way that small tweaks to the code can
> cause the error to disappear, I imagine it could be tricky to fix, but
> at the least there should probably be a warning in the docs that some
> kinds of anootation boxes won't work with some kinds of arrows when
> the text is too close to the annotated point.
>
> Any ideas?
>
> Thanks.
> --
> Brendan Barnwell
> "Do not follow where the path may lead. Go, instead, where there is
> no path, and leave a trail."
> --author unknown
>
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