Yes, it's true that uncommenting path.simplify : False line inside the
matplotlibrc file fixes the artifacts. However, it also produces HUGE
PDF/EPS file sizes. Perhaps, it's better to change path.simplify parameter
as needed inside the code via:
import matplotlib.pyplot as plt
plt.rcParams['path.simplify'] = False
# Plotting Code Block goes here
plt.rcdefaults()
Does anyone have another fix for this problem that DOES NOT produce HUGE
PDF/EPS files?
efiring wrote:
>
> Jouni K. Seppänen wrote:
>> Jordan Dawe <jd...@eos.ubc.ca> writes:
>>
>>> Contourf plots that I output in vector format files have little
>>> triangular glitches at the contour boundaries if the contoured array
>>> is larger than about 200x200. The same files in png format are
>>> perfect, even at very high dpi values.
>>
>> The current svn trunk doesn't have the really jarring little triangles
>> (at least in the pdf output), but there are still several very obtuse
>> white triangles between the regions. Rasterization at a high dpi makes
>> the output somewhat better at the cost of larger output files:
>>
>> c=contourf(X, Y, Z, 10)
>> axis((-3, 3, -3, 3))
>> savefig('unrasterized.pdf')
>> for d in c.collections:
>> d.set_rasterized(True)
>> savefig('rasterized.pdf',dpi=200)
>
>
> At least in the trunk--and maybe in 0.99.0--the problem is caused by
> path simplification. In the trunk, for the eps file, it goes away
> completely if I use a matplotlibrc with
>
> path.simplify : False
>
> In the trunk, what seems to be happening is that when a contour boundary
> is almost straight, but has an inflection point, the curves for the
> adjacent patch boundaries are simplified slightly differently. This is
> not surprising; if nothing else, the path will be traveled in a
> different direction when it is an outer boundary than when it is an
> inner boundary (for a set of concentric boundaries).
>
> Jordan, try using a local matplotlibrc with the above. Unless you are
> already customizing via a local matplotlibrc, that line is all you need.
>
> One reason the trunk behavior differs from 0.99.0 is that contour patch
> boundaries are now being turned into compound boundaries instead of
> using a branch cut to connect the outside path to the inside path. I
> suspect simplification is causing the artifacts in both cases, though.
>
> Eric
>
>
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