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andres0l1 opened this issue Apr 5, 2017 · 13 comments
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Hatches filling an empty color contour not saved in pdf #8431

andres0l1 opened this issue Apr 5, 2017 · 13 comments
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v2.0.1

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@andres0l1
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I am trying to create a contour plot with the contours filled with hatches and no color. The following example works if I save it to .png but when I save it to .pdf the output is just the axis.
github

import numpy as np
import matplotlib.pyplot as plt



delta = 0.025

x = y = np.arange(-3.0, 3.01, delta)


X, Y = np.meshgrid(x, y)
Z1 = plt.mlab.bivariate_normal(X, Y, 1.0, 1.0, 0.0, 0.0)
Z2 = plt.mlab.bivariate_normal(X, Y, 1.5, 0.5, 1, 1)
Z = 10 * (Z1 - Z2)


levels=[0,1]
plt.contourf(X, Y, Z/X, 
                  levels,
                  #alpha=0.5,
                  colors='none', label='AGH',
                   hatches=['\\'])

plt.tight_layout()   

plt.savefig('GitHub.pdf')
plt.show()

I am using Matplotlib2.00 in Linux, installed from source.
@dstansby
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dstansby commented Apr 9, 2017

Is the figure above what you expected to see when saving to a .pdf file? If so I think this is fixed on our master branch (we did a couple of patch fixes recently)

@andres0l1
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Hi Dstansby! Thanks what should I do then? Update the library or what exactly? Thanks!

@tacaswell tacaswell added this to the 2.0.1 (next bug fix release) milestone Apr 10, 2017
@tacaswell
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I can confirm that this works correctly on 2.0.x. I suggest installing from git for now, 2.0.1 will be out soon with this fix.

I have not checked, but I suspect this was fixed by f6b4a32 / #7976

@tacaswell
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either the master branch or 2.0.x should work.

@andres0l1
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Thanks a lot!!!

@tacaswell
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Closing as resolved, keep an eye out for the next release.

@mschauer
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There are still problems on version 2.0.2 with saving hatches into pdfs. I am calling

fill_between(xx, upper, lower, edgecolor=darkcol, facecolor=lightcol, hatch="X")

@dstansby
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2.1 is our latest release. Could you upgrade to that and let us know if there are still issues?

@mschauer
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I am now on 2.1.0 which fixes the problem. Thank you for the guidance.

@dstansby
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No problem!

@mschauer
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hatch

There is still something going on while saving hatches to pdf. Left the pdf, right the result of show.
I am not sure if I am reaching the limits to mathplotlib, but to the left also the hatch became transparent.

import matplotlib.pyplot as plt
xx = [1,2,3,4,5]
upper = [3,3,3,3,4]
lower = [1,2,2,2,2]
plt.fill_between(xx, upper, lower, edgecolor="darkred", facecolor=[0.5,0.5,0.5,0.1], hatch="X", label="as")
plt.legend()
plt.savefig('ups.pdf')
plt.show()

@afvincent
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The problem seems to occur with Acrobat Reader but not Evince. I tested the example from above with Matplotlib 2.0.0, 2.1.0 and from the master branch (on a Linux OS with Python 3.6): every time I get transparent hatches with Acrobat Reader (9.5.5) and correct hatches with Evince.

Worth opening a new dedicated issue?

@tacaswell
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@afvincent yes please

@afvincent afvincent mentioned this issue Nov 30, 2017
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@mnmelo mnmelo mentioned this issue Mar 23, 2020
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@tacaswell @mschauer @dstansby @afvincent @andres0l1